1. According to IRC:15-2011, _______% Fly ash is required to be replaced with the total cementitious materials..
A. 15.0.
B. 20.0.
C. 25.0.
D. 30.0.
Answer = 20.0
2. According to IRC:15-2002, _______% Fly ash is required to be replaced with the total cementitious materials..
A. 15.0.
B. 20.0.
C. 25.0.
D. 30.0.
Answer = 25.0
3. According to IRC:15-2002, Maximum nominal size of aggregates is ________.
A. 20 mm crushed aggregates.
B. 31.5 mm crushed aggregates.
C. 25 mm crushed aggregates.
D. 30.5 mm crushed aggregates.
Answer = 20 mm crushed aggregates
4. According to IRC:15-2011, Maximum nominal size of aggregates.
A. 20 mm crushed aggregates.
B. 31.5 mm crushed aggregates.
C. 25 mm crushed aggregates.
D. 30.5 mm crushed aggregates.
Answer = 31.5 mm crushed aggregates
5. According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC shall _____________.
A. Shall not be less than 360 kg/ m3.
B. Shall not be less than 425 kg/ m3.
C. Shall not be less than 340 kg/ m3.
D. Shall not be less than 500 kg/m3.
Answer = Shall not be less than 360 kg/ m3
6. According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for PPC shall _________.
A. Shall not be less than 360 kg/ m3.
B. Shall not be less than 425 kg/ m3.
C. Shall not be less than 340 kg/ m3.
D. Shall not be less than 500 kg/m3.
Answer = Shall not be less than 425 kg/ m3
7. According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC + fly ash mix OPC shall ____________.
A. Shall not be less than 360 kg/ m3.
B. Shall not be less than 425 kg/ m3.
C. Shall not be less than 340 kg/ m3.
D. Shall not be less than 500 kg/m3.
Answer = Shall not be less than 340 kg/ m3
8. According to IRC:15-2011, maximum free W/C ratio for OPC is ________________.
A. 0.45.
B. 0.4.
C. 0.5.
D. 0.55.
Answer = 0.45
9. According to IRC:15-2011, maximum free W/C ratio for PPC is _________.
A. 0.45.
B. 0.4.
C. 0.5.
D. 0.55.
Answer = 0.5
10. IS code for Specification for coarse and fine aggregates from natural sources for concrete?.
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 383:197
11. IS code for Specification for Portland slag cement?.
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 455:1989
12. IS Code of practice for plain and reinforced concrete..
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 456:2000
13. IS 457:1957 is for _____.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement flyash based.
C. Specification for Portland pozzolana cement calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Code of practice for general construction of plain and reinforced concrete for dams and other massive structures
14. IS 1489(Part 1):1991 is for ___________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement Part 1 Flyash based.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Specification for Portland pozzolana cement Part 1 Flyash based
15. IS 1489(Part 2):1991 is for ______________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement Part 1 Flyash based.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Specification for Portland-pozzolana cement: Part 2 Calcined clay based
16. IS 1727:1967 is for ____________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement Part 1 Fly ash based.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Methods of test for pozzolanic materials
17. IS 650:1991 is for _____________.
A. Specification for standard sand for testing of cement.
B. Methods of samplingand analysis of concrete.
C. Specification for pozzolana cement.
D. Methods of test for pozzolanicmaterials.
Answer = Specification for standard sand for testing of cement
18. IS 1199:1959 is for __________.
A. Specification for standard sand for testing of cement.
B. Methods of samplingand analysis of concrete.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanicmaterials.
Answer = Specification for standard sand for testing of cement
19. What is the approx amount of lime is present in cement?.
A. 60-67%.
B. 0.7.
C. 0.75.
D. 0.6.
Answer = 60-67%
20. What is the approx amount of silica is present in cement?.
A. 17-25%.
B. 3-8%.
C. 60-67%.
D. .1-4%.
Answer = 17-25%
21. What is the amount of Na2O & K2O in P.C. ?.
A. =.6%.
B. >>6%.
C. <6%.
D. 0.0.
Answer = <6%
22. Insoluble Residue mainly comes from which compound?.
A. Lime.
B. Soda.
C. Silica.
D. Alumina.
Answer = Silica
23. Loss on Ignition (L.O.I.) is the loss in weight of cement after being heated to ___.
A. 1000°C.
B. 100°C.
C. 500°C.
D. 1500°C.
Answer = 1000°C
24. “C4AF is not a true compound.” Is this statement true or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
25. On cooling below 1250oC, C3S decomposes __.
A. Fast.
B. Slowly.
C. Never.
D. Depends on the conditions.
Answer = Slowly
26. If the moisture content of 5 to 10% by weight, then the bulking of sand is increased by __.
A. 20.0.
B. 30.0.
C. 40.0.
D. 50.0.
Answer = 50.0
27. When sand is fully dry then it’s volume is _____.
A. Equal.
B. Less.
C. More.
D. Can’t say.
Answer = Equal
28. When the cement paste is tested within the gauging time. Here what is the value of gauging time?.
A. 3 to 5 minutes.
B. 3 to 5 hours.
C. 24 minutes.
D. 24 hours.
Answer = 3 to 5 minutes
29. A maximum value of ___ percent is allowed for WBM base course in Indian conditions..
A. 25.0.
B. 35.0.
C. 40.0.
D. 50.0.
Answer = 40.0
30. The mineral oil if present in mixing for concrete ______________.
A. Improves strength.
B. Reduces strength.
C. Gives more slump.
D. Gives a smooth surface.
Answer = Improves strength
31. With regard to the curing water, identify the incorrect statement..
A. Curing water shouldn’t produce objectionable stains on the surface.
B. The presence of tannic acid and iron compounds is objectionable.
C. Iron and organic matter are responsible for staining.
D. Water is suitable for mixing is also suitable for curing.
Answer = Iron and organic matter are responsible for staining
32. To neutralize 200 ml of sample should not require more than 10 ml of __ normal HCI using methyl orange..
A. 1.0.
B. 0.1.
C. 10.0.
D. 0.01.
Answer = 0.1
33. Aggregates to be used for wearing course, the impact value shouldn’t exceed __ percent..
A. 30.0.
B. 35.0.
C. 40.0.
D. 25.0.
Answer = 30.0
34. What is the range of water absorption of aggregates used in road?.
A. 2.5-2.9.
B. .1-2.
C. .1-2.5.
D. 2-2.9.
Answer = .1-2
35. The loss in weight should not exceed __ % when tested with Na2SO4 and __ % with MgSO4 solution..
A. 12, 18.
B. 18, 12.
C. 10, 15.
D. 15, 10.
Answer = 12, 18
36. If 60% aggregates doesn’t pass through the 2.36mm sieve, then what would be the value of Aggregate impact value?.
A. 0.6.
B. 0.4.
C. 0.25.
D. 1.0.
Answer = 0.4
37. In universal testing machine, for a circular section specimen, the gauge length is taken to be _____________.
A. 3.65 √A.
B. 4.65 √A.
C. 5.65 √A.
D. 6.65 √A where A is the area of cross section of the specimen.
Answer = 5.65 √A
38. During compression test of cast iron, the failure occurs i.e. the crack appears along the _________.
A. Diagonal.
B. Surface parallel to load applied.
C. Surface perpendicular to load applied.
D. Lateral.
Answer = Diagonal
39. The indenter used in Brinell hardness test is a ________________.
A. Ball.
B. Cone.
C. Cylinder.
D. Pyramid.
Answer = Cone
40. In charpy test specimen, the angle of v-notch section is ___________.
A. 30 degrees.
B. 45 degrees.
C. 60 degrees.
D. 90 degrees.
Answer = 45 degrees
41. During radiography test, which region absorbs less radiation and transmits more?.
A. Low and high density regions absorb and transmit same amount of radiation.
B. High density region.
C. Low density region.
D. Low and high density regions adsorb.
Answer = Low density region
42. Which test is used to determine dimensions of any object?.
A. Ultrasonic test.
B. Torsion test.
C. Eddy current test.
D. Compression test.
Answer = Eddy current test
43. In which type of test the capillary action principle is used?.
A. Probe test.
B. Bend liquid test.
C. Dye penetrant test.
D. Torsion test.
Answer = Dye penetrant test
44. Which test can be performed without skilled labour?.
A. Probe test.
B. Bend liquid test.
C. Dye penetrant test.
D. Torsion test.
Answer = Dye penetrant test
45. What is nondestructive test?.
A. Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness.
B. Nondestructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing.
C. Nondestructive tests are applications for detecting flaws in materials with impairing their usefulness.
D. Nondestructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing.
Answer = Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness
46. What is destructive test?.
A. Destructive tests are applications for detecting flaws in materials without impairing their usefulness.
B. Destructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing.
C. Destructive tests are applications for detecting flaws in materials with impairing their usefulness.
D. Destructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing.
Answer = Destructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing
47. Which machine is preferred for abrasion test?.
A. Vicat’s mould.
B. Los Angeles.
C. Flakiness Gauge.
D. Elongation Gauge.
Answer = Los Angeles
48. A maximum value of ___ percent is allowed for WBM base course in Indian conditions..
A. 25.0.
B. 35.0.
C. 40.0.
D. 50.0.
Answer = 40.0
49. A maximum value of 40%age is allowed for WBM base course in Indian conditions..
A. Aggregates to be used for wearing course, the impact value shouldn’t exceed __ percent..
B. 30.0.
C. 35.0.
D. 40.0.
Answer = Aggregates to be used for wearing course, the impact value shouldn’t exceed __ percent.
50. What is the range of water absorption of aggregates used in road?.
A. 2.5-2.9.
B. .1-2.
C. .1-2.5.
D. 2-2.9.
Answer = .1-2
51. The loss in weight should not exceed __ percent when tested with sodium sulphate and __ percent with magnesium sulphate solution..
A. 12, 18.
B. 18, 12.
C. 10, 15.
D. 15, 10.
Answer = 12, 18
52. If 60% aggregates doesn’t pass through the 2.36mm sieve, then what would be the value of Aggregate impact value?.
A. 0.6.
B. 0.4.
C. 0.25.
D. 1.0.
Answer = 0.4
53. What C31 test under Standard ASTM test method?.
A. Test Method for Making and Curing Concrete Test Specimens in the Field.
B. Test Method for Compressive Strength of Cylindrical Specimen.
C. Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete.
D. Test Method for Slump of Hydraulic Cement Concrete.
Answer = Test Method for Making and Curing Concrete Test Specimens in the Field
54. What C39 test under Standard ASTM test method?.
A. Test Method for Making and Curing Concrete Test Specimens in the Field.
B. Test Method for Compressive Strength of Cylindrical Specimen.
C. Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete.
D. Test Method for Slump of Hydraulic Cement Concrete.
Answer = Test Method for Compressive Strength of Cylindrical Specimen
55. What C138 test under Standard ASTM test method?.
A. Test Method for Making and Curing Concrete Test Specimens in the Field.
B. Test Method for Compressive Strength of Cylindrical Specimen.
C. Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete.
D. Test Method for Slump of Hydraulic Cement Concrete.
Answer = Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete
56. What C143 test under Standard ASTM test method?.
A. Test Method for Making and Curing Concrete Test Specimens in the Field.
B. Test Method for Compressive Strength of Cylindrical Specimen.
C. Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete.
D. Test Method for Slump of Hydraulic Cement Concrete.
Answer = Test Method for Slump of Hydraulic Cement Concrete
57. What C172 test under Standard ASTM test method?.
A. Test Method for Sampling Freshly Mixed Concrete.
B. Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method.
C. Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.
D. Test Method for Temperature of Freshly Mixed Portland-Cement Concrete.
Answer = Test Method for Sampling Freshly Mixed Concrete
58. What C173 test under Standard ASTM test method?.
A. Test Method for Sampling Freshly Mixed Concrete.
B. Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method.
C. Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.
D. Test Method for Temperature of Freshly Mixed Portland-Cement Concrete.
Answer = Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
59. What C 231 test under Standard ASTM test method?.
A. Test Method for Sampling Freshly Mixed Concrete.
B. Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method.
C. Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.
D. Test Method for Temperature of Freshly Mixed Portland-Cement Concrete.
Answer = Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method
60. What C 1064 test under Standard ASTM test method?.
A. Test Method for Sampling Freshly Mixed Concrete.
B. Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method.
C. Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.
D. Test Method for Temperature of Freshly Mixed Portland-Cement Concrete.
Answer = Test Method for Temperature of Freshly Mixed Portland-Cement Concrete
61. Generally what is the w/c ratio?.
A. 0.25.
B. 0.5.
C. 0.75.
D. 1.0.
Answer = 0.5
62. The slump would not exceed 50 mm when compacting concrete with vibrators..
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
63. The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called ____________.
A. Screeding.
B. Floating.
C. Troweling.
D. Compacting.
Answer = Screeding
64. What is the limitation of plasticizers?.
A. A good plasticizer is one which does not cause air-entrainment in concrete > .1-.2%.
B. A good plasticizer is one which does not cause air-entrainment in concrete > 5%.
C. A good plasticizer is one which does not cause air-entrainment in concrete > 10-20%.
D. A good plasticizer is one which does not cause air-entrainment in concrete > 1-2%.
Answer = A good plasticizer is one which does not cause air-entrainment in concrete > 1-2%
65. What is the allowed reduction of water with super plasticizers without reducing workability..
A. 0.1.
B. 0.2.
C. 0.3.
D. 0.4.
Answer = 0.3
66. A lower ratio leads to ___.
A. Higher strength and durability.
B. Higher strength but low durability.
C. Lower strength but high durability.
D. Lower strength and durability.
Answer = Higher strength and durability
67. Silica fume is _________.
A. Less reactive.
B. Neutral.
C. More reactive.
D. Absent in concrete.
Answer = More reactive
68. Content of SiO2 in silica fume?.
A. 0.52.
B. 0.35.
C. 0.219.
D. 85-97%.
Answer = 85-97%
69. What is the content of Al2O3 in fly ash?.
A. 30-60%.
B. 15-30%.
C. Up to 30%.
D. 1-7%.
Answer = 15-30%
70. Find the odd one out..
A. Water reducing plasticizers.
B. Water reducing plasticizers.
C. High performance plasticizers.
D. Super plasticizers.
Answer = Super plasticizers
71. For walls, columns and vertical faces of all structural members, the form work is generally removed after.
A. 24 to 48 hours.
B. 3 days.
C. 7 days.
D. 14 days.
Answer = 24 to 48 hours
72. The basic requirement for the success of any quality control plan is the availability of experienced, knowledgeable and trained personnel at all the levels. True or False..
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
73. Quality control helps to ____________ the risks of overdesign that ___________ the overall cost..
A. Maximize, Increase.
B. Minimize, Increase.
C. Maximize, Decrease.
D. Minimize, Decrease.
Answer = Minimize, Decrease
74. ___________ cost of maintenance of the structure __________ construction due to quality works..
A. Maximize, after.
B. Minimize, after.
C. Maximize, before.
D. Minimize, before.
Answer = Minimize, after
75. It __________ job-site concrete handling, and testing procedures to __________ potential liability to the company..
A. Improve, Increase.
B. Improve, Decrease.
C. Ruin, Decrease.
D. Ruin, Increase.
Answer = Improve, Decrease
76. ___________ quality construction ___________ the wastage of materials..
A. Good, reduce.
B. Bad, reduce.
C. Good, increase.
D. Bad, Decrease.
Answer = Good, reduce
77. Quality management system improves perception of customers towards company. True or false.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
78. It opens the area of improvement for quality construction rationally based on the documents from ___________ projects..
A. Previous.
B. Next.
C. Later.
D. Future.
Answer = Previous
79. The property of a material that resists penetration or indentation by means of abrasion or scratching is known as ____________.
A. Strength.
B. Hardness.
C. Stiffness.
D. Toughness.
Answer = Hardness
80. During compression test of cast iron, the failure occurs i.e. the crack appears along the __________.
A. Diagonal.
B. Surface parallel to load applied.
C. Surface perpendicular to load applied.
D. Lateral.
Answer = Diagonal
81. Quality management system _________ perception of customers towards company..
A. Improves.
B. Deprove.
C. Recede.
D. Worsen.
Answer = Improves
82. Good quality construction _________ the wastage of materials, smooth function of the team..
A. Increases.
B. Decreases.
C. Doesn’t effect.
D. Gain.
Answer = Decreases
83. Quality control helps to ___________ the risks of overdesign that ___________ the overall cost..
A. Maximize, Increase.
B. Minimize, Increase.
C. Maximize, Decrease.
D. Minimize, Decrease.
Answer = Minimize, Decrease
84. It opens the area of improvement for quality construction rationally based on the documents from __________ projects..
A. Previous.
B. Next.
C. Later.
D. Future.
Answer = Previous
85. Quality of construction activities will be tracked by quality management documents.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
86. It __________ job-site concrete handling, curing, sampling and testing procedures.
A. Improves.
B. Deprove.
C. Recede.
D. Worsen.
Answer = Improves
87. The cement concrete, from which entrained air and excess water are removed after placing it in position, is called ________.
A. Vacuum concrete.
B. LWC.
C. Prestressed concrete.
D. Sawdust concrete.
Answer = Vacuum concrete
88. Light weight cement content for compressive strength 3000 psi is __ pounds per cubic yard..
A. 400-510.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 440-560
89. The light-weight concrete is prepared by ____________.
A. Mixing Portlandcement with sawdust in specified proportion in the concrete.
B. Using coke-breeze, slag as aggregate in the concrete.
C. Mixing Al in the concrete.
D. Mixing Fe in the concrete.
Answer = Using coke-breeze, slag as aggregate in the concrete
90. Aerated Concrete is ______________.
A. Very heavy weight.
B. Heavy weight.
C. Medium weight.
D. Light weight.
Answer = Light weight
91. Entrainment of air also improves workability and durability..
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
92. No fines concrete is manufactured by _____________.
A. By adding no fines materials from normal concrete.
B. By eliminating no fines materials from normal concrete.
C. By reducing its strength.
D. By increasing its strength.
Answer = By eliminating no fines materials from normal concrete
93. Density of no fines concrete with light weight aggregate vary from ________ kg/m3..
A. 1600-1900.
B. <300.
C. >2500.
D. >300.
Answer = <300
94. “In bridges, HDC is used”. Is it true or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
95. What is the value of modulus of elasticity for Sulphur infiltered concrete?.
A. 60-115 MPa.
B. 10-16 MPa.
C. 35-50 GPa.
D. 500 GPa.
Answer = 35-50 GPa
96. Diameter of Round Steel Fiber lies in the range of ________ mm..
A. .3-.5.
B. .25-.75.
C. .155-.41.
D. .25-.90.
Answer = .25-.75
97. The cement concrete, from which entrained air and excess water are removed after placing it in position, is called _________.
A. Vacuum concrete.
B. LWC.
C. Prestressed concrete.
D. Sawdust concrete.
Answer = Vacuum concrete
98. The removal of excess air after placing concrete helps in increasing the strength of concrete by ___________.
A. 15-20%.
B. 20-25%.
C. 30-50%.
D. 50-70%.
Answer = 15-20%
99. The light-weight concrete is prepared by ____________.
A. Mixing Portland cement with sawdust in specified proportion in the concrete.
B. Using coke-breeze, cinder or slag as aggregate in the concrete.
C. Mixing aluminum in the concrete.
D. Mixing steel in the concrete.
Answer = Using coke-breeze, cinder or slag as aggregate in the concrete
100. The sound absorption coefficient of light weight concrete is nearly __________.
A. Twice.
B. Thrice.
C. Four times.
D. Six times.
Answer = Twice
101. This type of concrete possesses __________.
A. High insulating property.
B. High conducting property.
C. Low insulating property.
D. Very high insulating property.
Answer = Very high insulating property
102. In making precast structural units for partition and wall lining purposes, the concrete should be __________.
A. Vacuum concrete.
B. LWC.
C. Prestressed concrete.
D. Sawdust concrete.
Answer = LWC
103. Most low-density aggregates are ________ in origin..
A. Volcanic.
B. Sea water.
C. Highly dense area.
D. Low dense area.
Answer = Volcanic
104. ________ is also something used as the aggregate component of lightweight concretes..
A. Conglomerate.
B. Gneiss.
C. Marble.
D. Diatomite.
Answer = Diatomite
105. ________ is the most commonly used..
A. Conglomerate.
B. Gneiss.
C. Marble.
D. Pumice.
Answer = Pumice
106. Aggregates with a specific gravity of _________ are called lightweight aggregates..
A. <2.4.
B. 2.4-2.8.
C. >2.8.
D. > 3.
Answer = <2.4
107. Light weight cement content for compressive strength 2500 psi is _______ pounds per cubic yard..
A. 400-510.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 400-510
108. Light weight cement content for compressive strength 3000 psi is _______ pounds per cubic yard..
A. 400-510.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 440-560
109. Light weight cement content for compressive strength 4000 psi is _______ pounds per cubic yard..
A. 740-840.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 530-660
110. Light weight cement content for compressive strength 5000 psi is _______ pounds per cubic yard..
A. 400-510.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 630-750
111. Light weight cement content for compressive strength 6000 psi is _______ pounds per cubic yard..
A. 740-840.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 440-560
112. Light weight cement content for compressive strength 17.24 MPa is _______ kg/m3..
A. 237-303.
B. 261-332.
C. 314-392.
D. 373-445.
Answer = 237-303
113. Light weight cement content for compressive strength 20.68 MPa is _______ kg/m3..
A. 237-303.
B. 261-332.
C. 314-392.
D. 373-445.
Answer = 261-332
114. Light weight cement content for compressive strength 27.58 MPa is _______ kg/m3..
A. 237-303.
B. 261-332.
C. 314-392.
D. 373-445.
Answer = 314-392
115. Light weight cement content for compressive strength 34.47MPa is _______ kg/m3..
A. 237-303.
B. 261-332.
C. 314-392.
D. 373-445.
Answer = 373-445
116. Light weight cement content for compressive strength 41.37 MPa is _______ kg/m3..
A. 237-303.
B. 261-332.
C. 314-392.
D. 439 – 498.
Answer = 237-303
117. What is the amount of mixing water used to make LWC?.
A. ½.
B. 2/3.
C. ¼.
D. 1/3.
Answer = 2/3
118. What is the normal time to get uniform mixing?.
A. 30 seconds.
B. 2 or more minutes.
C. 1 minutes.
D. 24 hours.
Answer = 2 or more minutes
119. The strength of the resulting concrete is _______ % lower than when dry aggregate is used for the same content..
A. 5-10.
B. 10-15.
C. 15-20.
D. 0-5.
Answer = 5-10
120. The density of concrete made with saturated aggregate is ___________.
A. High.
B. Low.
C. Very high.
D. Very low.
Answer = High
121. The light-weight concrete is prepared by ________.
A. Mixing Portland cement with sawdust in specified proportion in the concrete.
B. Using coke-breeze, slag as aggregate in the concrete.
C. Mixing Al in the concrete.
D. Mixing Fe in the concrete.
Answer = Using coke-breeze, slag as aggregate in the concrete
122. Light weight cement content for compressive strength 4000 psi is _______ pounds per cubic yard..
A. 740-840.
B. 440-560.
C. 530-660.
D. 630-750.
Answer = 530-660
123. Light weight cement content for compressive strength 27.58 MPa is _______ kg/m3..
A. 237-303.
B. 261-332.
C. 314-392.
D. 373-445.
Answer = 314-392
124. Aerated Concrete is _________.
A. Very heavy weight.
B. Heavy weight.
C. Medium weight.
D. Light weight.
Answer = Light weight
125. Air contents should be _________ % by volume..
A. 1-2.
B. 2-3.
C. 3-4.
D. 4-5.
Answer = 3-4
126. Entrainment of air also improves workability and durability..
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
127. Which one is not used as air entraining agents?.
A. Alumina.
B. Natural resins.
C. Fats.
D. Oil.
Answer = Alumina
128. Entrainment of air while applying cement, increases resistance to frost action..
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
129. Aerated concrete is made in the density of approx. _________ kg/m3..
A. 50.0.
B. 150.0.
C. 250.0.
D. 350.0.
Answer = 350.0
130. No fines concrete is manufactured by _____________.
A. By adding no fines materials from normal concrete.
B. By eliminating no fines materials from normal concrete.
C. By reducing its strength.
D. By increasing its strength.
Answer = By eliminating no fines materials from normal concrete
131. No fines concrete is manufactured by _______.
A. By adding no fines materials from normal concrete.
B. By eliminating no fines materials from normal concrete.
C. By reducing its strength.
D. By increasing its strength.
Answer = By eliminating no fines materials from normal concrete
132. Coarse aggregates which has been used in this is of __________.
A. 10 mm.
B. 20 mm.
C. 15 mm.
D. 25 mm.
Answer = 10 mm
133. The w/c ratio is kept in the range of _______.
A. .1-.2.
B. .38-.52.
C. .83-1.
D. .25-.38.
Answer = .38-.52
134. Density of no fines concrete with normal aggregate vary from __ kg/m3..
A. 1600-1900.
B. <300.
C. >2500.
D. >300.
Answer = 1600-1900
135. Density of no fines concrete with light weight aggregate vary from __ kg/m3..
A. 1600-1900.
B. <300.
C. >2500.
D. >300.
Answer = <300
136. The compressive strength of no fines concrete varies between __________.
A. 0-5 MPa.
B. 4-14 MPa.
C. 25 MPa.
D. >15 MPa.
Answer = 4-14 MPa
137. Which of the following is the disadvantages of this concrete?.
A. Lightweight.
B. Low strength.
C. Low shrinkage.
D. Good thermal insulating property.
Answer = Low strength
138. Which of the following is the advantages of this concrete?.
A. Low density.
B. Low strength.
C. It can’t be use in RCC structure.
D. Cannot be measured by any available standard methods.
Answer = Low density
139. The range of the density for this concrete is ___________.
A. >5000 kg/cu. m.
B. <6000 kg/cu m.
C. 3400-5600 kg/cu m.
D. <3400 kg/cu m.
Answer = 3400-5600 kg/cu m
140. The compressive strength varies from ____________.
A. <200 kg/cm2.
B. > 550 kg/cm2.
C. 200-550 kg/cm2.
D. 700 kg/cm2.
Answer = 200-550 kg/cm2
141. Due to low w/c ratio _____________.
A. It doesn’t cause any problems.
B. It causes problems.
C. Workability is easy.
D. Strength is more.
Answer = It causes problems
142. Which type of aggregates are used to produce 70MPa compressive strength?.
A. All in one.
B. Fine.
C. Coarse.
D. Flaky.
Answer = Coarse
143. Maximum size of aggregates are used to produce 70MPa compressive strength?.
A. 20-30 mm.
B. 10-20 mm.
C. 30-40 mm.
D. 40-50 mm.
Answer = 20-30 mm
144. Maximum size of aggregates are used to produce 100MPa compressive strength?.
A. 20-30 mm.
B. 10-20 mm.
C. 30-40 mm.
D. 40-50 mm.
Answer = 10-20 mm
145. Main component in this concrete is _______.
A. Cement.
B. Sulphur.
C. Sulphur and aggregates.
D. Aggregates.
Answer = Sulphur and aggregates
146. What is the compressive strength of this concrete?.
A. 60-115 MPa.
B. 10-16 MPa.
C. 35-50 GPa.
D. 500 GPa.
Answer = 60-115 MPa
147. What is the bending strength of this concrete?.
A. 60-115 MPa.
B. 10-16 MPa.
C. 35-50 GPa.
D. 500 GPa.
Answer = 10-16 MPa
148. What is the value of modulus of elasticity?.
A. 60-115 MPa.
B. 10-16 MPa.
C. 35-50 GPa.
D. 500 GPa.
Answer = 35-50 GPa
149. What is the range of contraction for this concrete in mm/m?.
A. .5-1.
B. 0.6.
C. <1.
D. >1.
Answer = .5-1
150. What is the linear coefficient of thermal expansibility for this concrete in 10-6/K?.
A. 8-12.
B. 8-10.
C. 10-15.
D. 12-15.
Answer = 8-12
151. What is the density for this concrete in kg/m3?.
A. 2400.0.
B. 2200.0.
C. 2000.0.
D. 1800.0.
Answer = 2400.0
152. _______ % is the range for porosity of this concrete..
A. 1-4.
B. 5.0.
C. 0-1.
D. 9-15.
Answer = 1-4
153. _______ % is the range for absorptivity of this concrete..
A. 1-4.
B. 5.0.
C. 0-1.
D. 9-15.
Answer = 0-1
154. Diameter of Round Steel Fiber lies in the range of _______ mm..
A. .3-.5.
B. .25-.75.
C. .155-.41.
D. .25-.90.
Answer = .25-.75
155. What is the thickness of the steel fiber after silting in mm?.
A. .3-.5.
B. 0.25.
C. .155-.41.
D. .25-.90.
Answer = 0.25
156. What is the thickness of the flat sheet fibers after silting in mm?.
A. .3-.5.
B. 0.25.
C. .15-.41.
D. .25-.90.
Answer = .15-.41
157. What is the width of the flat sheet fibers after silting in mm?.
A. .3-.5.
B. 0.25.
C. .15-.41.
D. .25-.90.
Answer = .25-.90
158. Polypropylene fibers is hydrophobic in nature. True or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
159. Glass fiber is made up from _______ individual filaments..
A. 100-200.
B. 200-400.
C. 500.0.
D. >500.
Answer = 200-400
160. What is the 10 day compressive failure stress in N/mm2?.
A. 40.0.
B. 1500.0.
C. 3.4.
D. 180.0.
Answer = 40.0
161. What is the 10 day compressive young’s modulus in N/mm2?.
A. 40.0.
B. 1500.0.
C. 3.4.
D. 180.0.
Answer = 1500.0
162. What is the 10 day bending failure stress in N/mm2?.
A. 40.0.
B. 1500.0.
C. 3.4.
D. 180.0.
Answer = 3.4
163. What is the 10 day bending young’s modulus in N/mm2?.
A. 40.0.
B. 1500.0.
C. 3.4.
D. 180.0.
Answer = 180.0
164. What is the 7th day compressive failure stress in N/mm2?.
A. 40.0.
B. 1500.0.
C. 38.0.
D. 180.0.
Answer = 38.0
165. What is the 7 day bending failure stress in N/mm2?.
A. 40.0.
B. 1500.0.
C. 3.3.
D. 180.0.
Answer = 3.3
166. ___________ mm thickness is not available in concrete cloth..
A. 5.0.
B. 8.0.
C. 13.0.
D. 18.0.
Answer = 18.0
167. ________ viscosity liquid monomers are impregnated with the hardened cement composite structure..
A. High.
B. 0.0.
C. Low.
D. Very high.
Answer = Low
168. Water-filled voids ranges from _______ % of the total volume of the component for dense concrete..
A. 5.0.
B. 15.0.
C. 10.0.
D. 20.0.
Answer = 5.0
169. Water-filled voids ranges from _______ % of the total volume of the component for gap-graded concrete..
A. 5.0.
B. 15.0.
C. 10.0.
D. 20.0.
Answer = 15.0
170. What is the time required to give heating to remove the moisture from the concrete?.
A. 6-8 hrs.
B. 10 hrs.
C. 24 hrs.
D. 48 hrs.
Answer = 6-8 hrs
171. At what temperature the heat is supplied to concrete to remove moisture in oC?.
A. 35.0.
B. 120-150.
C. 100.0.
D. 60-150.
Answer = 120-150
172. Which temperature avoids flammability?.
A. 35.0.
B. 120-150.
C. 100.0.
D. 60-150.
Answer = 35.0
173. The moisture content of the aggregate shall not exceed from ____________.
A. .1% – .5%.
B. 1% – 55.
C. 10% – 50%.
D. 0.15.
Answer = .1% – .5%
174. Which one is not the polymeric resin?.
A. Polyester resin.
B. Epoxy resin.
C. Vinyl ester resin.
D. Sulphates.
Answer = Sulphates
175. Higher resin dosage is recommended when using ________.
A. Coarse aggregate.
B. Fine aggregates.
C. All in one aggregates.
D. More cement.
Answer = Fine aggregates
176. Steel fibers helps in the enhancement of its properties. True or False?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
177. The addition of glass fibers are in the range of __________.
A. 0-6%.
B. 0.1.
C. 15-20%.
D. 20%-25%.
Answer = 0-6%
178. Concrete is not recommended to be placed at a temperature below __________oC..
A. 2.0.
B. 3.0.
C. 4.0.
D. 5.0.
Answer = 5.0
179. IS: 7861 part-2 deals with.
A. Hot weathering concrete.
B. Cold weathering concrete.
C. Air entertained concrete.
D. OPC.
Answer = Cold weathering concrete
180. Why the time period for removal of form work has to be increased..
A. The development of strength of concrete is retarded compared with development at normal temperature.
B. The development of strength of concrete is accelerate compared with development at normal temperature.
C. The development of strength of concrete is advanced compared with development at normal temperature.
D. The development of strength of concrete is precocious compared with development at normal temperature.
Answer = The development of strength of concrete is retarded compared with development at normal temperature
181. If concrete is exposed to repeated freezing and -thawing after final set, the final qualities of the concrete may also be.
A. Impair.
B. Aid.
C. Improve.
D. Extend.
Answer = Impair
182. Large temperature differentials within the concrete member may promote.
A. Elastic shrinkage.
B. Cracking.
C. High workability.
D. Good strength.
Answer = Cracking
183. When the concrete in fresh stage is exposed to freeze before certain pre-hardening period, compressive strength may get.
A. Increased to 50%.
B. Decreased to 50%.
C. Increased to 25%.
D. Decreased to 25%.
Answer = Decreased to 50%
184. Concrete is not recommended to be placed at a temperature above _________oC..
A. 20.0.
B. 30.0.
C. 40.0.
D. 50.0.
Answer = 40.0
185. IS: 7861 part-1 deals with ___________.
A. Hot weathering concrete.
B. Cold weathering concrete.
C. Air entertained concrete.
D. OPC.
Answer = Hot weathering concrete
186. A higher temperature of fresh concrete results in a __________ hydration of cement..
A. More rapid.
B. Rapid.
C. Low.
D. Very low.
Answer = More rapid
187. Does this reduce handling time?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
188. Rapid evaporation may cause plastic shrinkage __________.
A. Elastic shrinkage.
B. Plastic shrinkage.
C. High workability.
D. Good strength.
Answer = Plastic shrinkage
189. It is difficult to retain moisture for hydration for RAPID EVAPORATION OF WATER DURING CURING PERIOD..
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
190. Prepacked concrete _________ water proofing concrete..
A. Is.
B. Is not.
C. May be.
D. Is but depends on temperature.
Answer = Is
191. Cement has ________ % volumetric shrinkage after curing..
A. 5.0.
B. 6.0.
C. 7.0.
D. 8.0.
Answer = 5.0
192. After vacuum mixing, the volumetric shrinkage can be raised from 3–5% to __________ % in different cements..
A. 1-2.
B. 3-5.
C. 5-7.
D. 6-8.
Answer = 5-7
193. Vacuum mixing systems reduce the exposure by _________ %..
A. 20.0.
B. 40.0.
C. 50.0.
D. 10.0.
Answer = 50.0
194. The exposure of conventional mixing in open bowl is about ___________ ppm in the breathing zone..
A. 20.0.
B. 40.0.
C. 50.0.
D. 10.0.
Answer = 10.0
195. The __________ compressive strength required from structural consideration..
A. Nominal.
B. Minimum.
C. Maximum.
D. No.
Answer = Minimum
196. The adequate workability necessary for ___________ compaction with the compacting equipment available..
A. Half.
B. Quarter.
C. Full.
D. Double.
Answer = Full
197. ___________ water-cement ratio content to give adequate durability for the particular site conditions..
A. Minimum.
B. Nominal.
C. 0.5.
D. Maximum.
Answer = Maximum
198. _______ cement content to avoid shrinkage cracking due to temperature cycle in mass concrete..
A. Minimum.
B. Nominal.
C. 0.5.
D. Maximum.
Answer = Maximum
199. ________ has designated the concrete mixes into a number of grades as M10, M15..
A. IS 456-2000.
B. IS 456-2010.
C. IS 513-1999.
D. IS 465-2000.
Answer = IS 456-2000
200. What is the approx. mix proportion for M10?.
A. 1:3:6.
B. 1:2:4.
C. 1:1.5:3.
D. 1:1:2.
Answer = 1:3:6
201. What is the approx. mix proportion for M15?.
A. 1:3:6.
B. 1:2:4.
C. 1:1.5:3.
D. 1:1:2.
Answer = 1:2:4
202. What is the approx. mix proportion for M20?.
A. 1:3:6.
B. 1:2:4.
C. 1:1.5:3.
D. 1:1:2.
Answer = 1:1.5:3
203. What is the approx. mix proportion for M25?.
A. 1:3:6.
B. 1:2:4.
C. 1:1.5:3.
D. 1:1:2.
Answer = 1:1:2
204. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by _______.
A. IS 456-2000.
B. IS 456-2010.
C. IS 513-1999.
D. IS 465-2000.
Answer = IS 456-2000
205. Which test is used to determine dimensions of any object?.
A. Ultrasonic test.
B. Torsion test.
C. Eddy current test.
D. Compression test.
Answer = Eddy current test
206. Identify the type of destructive testing..
A. Radiographic test.
B. Dye penetrant test.
C. Creep test.
D. Visual testing.
Answer = Creep test
207. Which test can be performed without skilled labor?.
A. Probe test.
B. Bend liquid test.
C. Dye penetrant test.
D. Torsion test.
Answer = Dye penetrant test
208. Compressive strength of hardened concrete is done by _______.
A. Cube test.
B. Tensile splitting test.
C. Concrete core test.
D. Flexure test.
Answer = Cube test
209. In the soundness test a specimen of hardened cement paste is _______ for a fixed time..
A. Freeze.
B. Dry.
C. Boiled.
D. Dipped in water.
Answer = Boiled
210. Loss on Ignition (L.O.I.) is the loss in weight of cement after being heated to _______.
A. 1000°C.
B. 100°C.
C. 500°C.
D. 1500°C.
Answer = 1000°C
211. On cooling below 1250oC, C3S decomposes ______.
A. Fast.
B. Slowly.
C. Never.
D. Depends on the conditions.
Answer = Slowly
212. What is final setting time?.
A. The time at which cement paste loses its plasticity.
B. The time to reach that stage at which cement paste loses its elasticity.
C. The time at which cement paste gains its plasticity.
D. The time when cement paste becomes hardened.
Answer = The time at which cement paste loses its plasticity
213. The loss in weight should not exceed ______ percent when tested with sodium sulphate and ______ percent with magnesium sulphate solution..
A. 12, 18.
B. 18, 12.
C. 10, 15.
D. 15, 10.
Answer = 12, 18
214. If 60% aggregates doesn’t pass through the 2.36mm sieve, then what would be the value of Aggregate impact value?.
A. 0.6.
B. 0.4.
C. 0.25.
D. 1.0.
Answer = 0.4
215. What is the moisture content in slurry for wet process?.
A. 35-50%.
B. 0.12.
C. 40-45%.
D. 1.0.
Answer = 35-50%
216. The use of crushed aggregates may results in 10 to 20% higher compressive strength. Is this statement true or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
217. In a dry environment, concrete strength will be loosed as much as __________ % in moist environment..
A. 30.0.
B. 40.0.
C. 50.0.
D. 60.0.
Answer = 50.0
218. After finishing concrete surface must be kept __________.
A. Dry.
B. First dry it and then wet it.
C. First wet it and then dry it.
D. Wet.
Answer = Wet
219. A ___________ paste structure undergoes ___________ creep..
A. Good, high.
B. Poor, high.
C. Good, average.
D. Poor, low.
Answer = Poor, high
220. The rate of creep rapidly ___________ with time..
A. Increase.
B. Decrease.
C. Doesn’t affect.
D. Depends on the temperature.
Answer = Decrease
221. The rate of creep generally ____________ with the ____________ of the size of aggregates..
A. Increase, increase.
B. Decrease, decease.
C. Increase, decrease.
D. 2.5, 12mm.
Answer = Increase, decrease
222. Reduction in the volume due to shrinkage causes __________.
A. Low volume.
B. Volumetric strain.
C. Volumetric stress.
D. W/c ratio.
Answer = Volumetric strain
223. “Shrinkage in concrete is caused mainly by loss of water by evaporation or by hydration of cement”. Is this statement true or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
224. Dry intervals in surface wetting leads to __________.
A. Cracking.
B. Fogging.
C. High strength.
D. Good workability.
Answer = Cracking
225. SCC has __________ yield stress..
A. Low.
B. High.
C. Medium.
D. 0.75.
Answer = Low
226. SCC has __________ deformability..
A. Low.
B. High.
C. Medium.
D. 0.75.
Answer = High
227. SCC has __________ viscosity..
A. Low.
B. High.
C. Medium.
D. 0.75.
Answer = Medium
228. SCC has ___________ segregation resistance..
A. Good.
B. Bad.
C. Average.
D. Poor.
Answer = Good
229. SCC is measured using the.
A. Picat’s apparatus.
B. Slump-flow test.
C. Slump test.
D. Standard Consistency Test.
Answer = Slump-flow test
230. What is plasticizers?.
A. Which adds water for workability.
B. Which reduces water for workability.
C. Which decreases workability at the same water content.
D. Which oxidizes water for workability.
Answer = Which reduces water for workability
231. Which one is an anionic surfactants?.
A. Polyglycol esters.
B. Hydroxylated carboxylic acids.
C. Lignosulphonates.
D. Carbohydrates.
Answer = Lignosulphonates
232. What is the amount used of plasticizers in cement by weight?.
A. 0.0.
B. .1-.4%.
C. 0.01.
D. 1-2%.
Answer = .1-.4%
233. What is the limitation of plasticizers?.
A. A good plasticizer is one which does not cause air-entrainment in concrete > .1-.2%..
B. A good plasticizer is one which does not cause air-entrainment in concrete > 5%..
C. A good plasticizer is one which does not cause air-entrainment in concrete > 10-20%..
D. A good plasticizer is one which does not cause air-entrainment in concrete > 1-2%..
Answer = A good plasticizer is one which does not cause air-entrainment in concrete > 1-2%.
234. At constant workability, what is the reduction in mixing water?.
A. 1-2%.
B. 0.5.
C. .1-.4%.
D. 5-15%.
Answer = 5-15%
235. Where do we use plasticizers?.
A. Where low degree of workability is required.
B. Where medium degree of workability is required.
C. Where high degree of workability is required.
D. Where very low degree of workability is required.
Answer = Where high degree of workability is required
236. What is super plasticizers?.
A. Which adds water for workability.
B. Which reduces high range of water for workability.
C. Which decreases workability at the same water content.
D. Which oxidizes water for workability.
Answer = Which reduces high range of water for workability
237. What is the allowed reduction of water with super plasticizers without reducing workability?.
A. 0.1.
B. 0.2.
C. 0.3.
D. 0.4.
Answer = 0.3
238. Is it possible to use w/c ratio as low as 5?.
A. Yes.
B. No.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = No
239. What is the limitation of Carboxylic acids in High range water reducers?.
A. 0.0.
B. 0.001.
C. 0.002.
D. 0.003.
Answer = 0.001
240. IS code for Specification for ordinary Portland cement, 33 grade?.
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 269:1989
241. IS code for Specification for coarse and fine aggregates from natural sources for concrete?.
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 383:197
242. IS code for Specification for Portland slag cement?.
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 455:1989
243. IS Code of practice for plain and reinforced concrete..
A. IS 269:1989.
B. IS 383:197.
C. IS 455:1989.
D. IS 456:2000.
Answer = IS 456:2000
244. IS 457:1957 is for __________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement flyash based.
C. Specification for Portland pozzolana cement calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Code of practice for general construction of plain and reinforced concrete for dams and other massive structures
245. IS 1489(Part 1):1991 is for _________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement Part 1 Flyash based.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Specification for Portland pozzolana cement Part 1 Flyash based
246. IS 1489(Part 2):1991 is for _____________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement Part 1 Flyash based.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Specification for Portland-pozzolana cement: Part 2 Calcined clay based
247. IS 1727:1967 is for ___________.
A. Code of practice for general construction of plain and reinforced concrete for dams and other massive structures.
B. Specification for Portland pozzolana cement Part 1 Fly ash based.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanic materials.
Answer = Methods of test for pozzolanic materials
248. IS 650:1991 is for _____________.
A. Specification for standard sand for testing of cement.
B. Methods of samplingand analysis of concrete.
C. Specification for pozzolana cement.
D. Methods of test for pozzolanicmaterials.
Answer = Specification for standard sand for testing of cement
249. IS 1199:1959 is for _________.
A. Specification for standard sand for testing of cement.
B. Methods of samplingand analysis of concrete.
C. Specification for Portland-pozzolana cement: Part 2 Calcined clay based.
D. Methods of test for pozzolanicmaterials.
Answer = Specification for standard sand for testing of cement
250. What is the moisture content in slurry for wet process?.
A. 35-50%.
B. 0.12.
C. 40-45%.
D. 1.0.
Answer = 35-50%
251. The use of crushed aggregates may results in 10 to 20% higher compressive strength. Is this statement true or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
252. In a dry environment, concrete strength will be loosed as much as ________ % in moist environment..
A. 30.0.
B. 40.0.
C. 50.0.
D. 60.0.
Answer = 50.0
253. After finishing concrete surface must be kept ________.
A. Dry.
B. First dry it and then wet it.
C. First wet it and then dry it.
D. Wet.
Answer = Wet
254. A _________ paste structure undergoes _________ creep..
A. Good, high.
B. Poor, high.
C. Good, average.
D. Poor, low.
Answer = Poor, high
255. The rate of creep rapidly _________ with time..
A. Increase.
B. Decrease.
C. Doesn’t affect.
D. Depends on the temperature.
Answer = Decrease
256. The rate of creep generally ____ with the ____ of the size of aggregates..
A. Increase, increase.
B. Decrease, decease.
C. Increase, decrease.
D. 2.5, 12mm.
Answer = Increase, decrease
257. Reduction in the volume due to shrinkage causes _________.
A. Low volume.
B. Volumetric strain.
C. Volumetric stress.
D. W/c ratio.
Answer = Volumetric strain
258. “Shrinkage in concrete is caused mainly by loss of water by evaporation or by hydration of cement”. Is this statement true or false?.
A. TRUE.
B. FALSE.
C. Nothing Can be Said.
D. None of the mentioned.
Answer = TRUE
259. Dry intervals in surface wetting leads to ____________.
A. Cracking.
B. Fogging.
C. High strength.
D. Good workability.
Answer = Cracking
260. Symptoms for acid attack?.
A. It will show disintegration of the concrete evidenced by loss of the cement paste.
B. It will show concrete surfaces that are very rough in areas where the paste is leached.
C. Affected concrete does not exhibit telltale features too distinctly.
D. Expansion does not occur without reaction products.
Answer = It will show disintegration of the concrete evidenced by loss of the cement paste
261. Symptoms for aggressive water attack?.
A. It will show disintegration of the concrete evidenced by loss of the cement paste.
B. It will show concrete surfaces that are very rough in areas where the paste is leached.
C. Affected concrete does not exhibit telltale features too distinctly.
D. Expansion does not occur without reaction products.
Answer = It will show concrete surfaces that are very rough in areas where the paste is leached
262. Symptoms for aggressive ACR reaction?.
A. It will show disintegration of the concrete evidenced by loss of the cement paste.
B. It will show concrete surfaces that are very rough in areas where the paste is leached.
C. Affected concrete does not exhibit telltale features too distinctly.
D. Expansion does not occur without reaction products.
Answer = Affected concrete does not exhibit telltale features too distinctly
263. Symptoms for aggressive ASR?.
A. It will show disintegration of the concrete evidenced by loss of the cement paste.
B. It will show concrete surfaces that are very rough in areas where the paste is leached.
C. Affected concrete does not exhibit telltale features too distinctly.
D. Expansion does not occur without reaction products.
Answer = Expansion does not occur without reaction products
264. What should be the minimum water cement ratio?.
A. 0.45.
B. 0.5.
C. <.45.
D. >.45.
Answer = <.45
265. Cement not more than ________ months old should be used..
A. 1.0.
B. 1.5.
C. 2.0.
D. 3.0.
Answer = 3.0
266. Powder epoxy is fusion bonded to bar at about _________ Degree C temperature..
A. 100.0.
B. 250.0.
C. 300.0.
D. 350.0.
Answer = 250.0
267. At the construction stage, binding wires ____________.
A. Should touch the formwork.
B. Should not touch the formwork.
C. To be turned outside.
D. To be turned whole structure.
Answer = Should not touch the formwork
268. Creep is ____ to the strength of concrete..
A. Equal.
B. Similar.
C. Directly proportional.
D. Inversely proportional.
Answer = Inversely proportional
269. What is elastic strains?.
A. These are the instantaneous deformations that occur when an external stress is first applied.
B. These deformations occur either on loss of moisture from the concrete on cooling of concrete.
C. It is the time-dependent deformation that occurs on the prolonged application of stress.
D. Any one or combinations of the above types of deformations in a hardened concrete leads to cracking.
Answer = These are the instantaneous deformations that occur when an external stress is first applied
270. How can we prevent cracks in concrete structures?.
A. Due to heavy load.
B. Low w/c ratio.
C. Settlement of structure.
D. High water cement ratio.
Answer = Low w/c ratio
271. What is the maximum w/c ratio?.
A. 0.2.
B. 0.3.
C. 0.4.
D. 0.5.
Answer = 0.5
272. Which can be the possible option for cracking in the building?.
A. Due to light load.
B. Low w/c ratio.
C. Temperature difference.
D. Gain of water.
Answer = Temperature difference
273. Is it possible to have 0% crack in our building?.
A. Yes.
B. No.
C. May be.
D. Can’t be determined.
Answer = No
274. Plastic shrinkage cracking occurs in ________ hours after placing..
A. 0.5.
B. 24.0.
C. 10.0.
D. 5.0.
Answer = 5.0
275. Which one can’t be the reason for the shrinkage of concrete?.
A. W/c ratio.
B. Temperature.
C. Cement content.
D. Formwork.
Answer = Formwork
276. Evaluation of cracks ________ be determined before cracking..
A. Can.
B. Can’t.
C. Sometimes.
D. Depends on the structure.
Answer = Can
277. Evaluation of cracks _________ be determined after cracking..
A. Can.
B. Can’t.
C. Sometimes.
D. Depends on the structure.
Answer = Can
278. What is destructive test?.
A. Destructive tests are applications for detecting flaws in materials without impairing their usefulness.
B. Destructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing.
C. Destructive tests are applications for detecting flaws in materials with impairing their usefulness.
D. Destructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing.
Answer = Destructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing
279. Identify the type of destructive testing..
A. Radiographic test.
B. Dye penetrant test.
C. Creep test.
D. Visual testing.
Answer = Creep test
280. Which test can be performed without skilled labor?.
A. Probe test.
B. Bend liquid test.
C. Dye penetrant test.
D. Torsion test.
Answer = Dye penetrant test
281. Compressive strength of hardened concrete is done by _________.
A. Cube test.
B. Tensile splitting test.
C. Concrete core test.
D. Flexure test.
Answer = Cube test
282. It is about ___ times the tensile stress determined by the splitting test..
A. Equal.
B. 0.5.
C. 1.5.
D. 2.0.
Answer = 1.5
283. A ratio of core height-to-diameter of ___ gives a standard cylinder test..
A. 1.0.
B. 2.0.
C. 3.0.
D. 4.0.
Answer = 2.0
284. In Concrete core test the strength is __ at the top and ___ at the bottom..
A. Lowest, lowest.
B. Lowest, highest.
C. Highest, lowest.
D. Highest, highest.
Answer = Lowest, highest
285. What is nondestructive test?.
A. Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness.
B. Nondestructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing.
C. Nondestructive tests are applications for detecting flaws in materials with impairing their usefulness.
D. Nondestructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing.
Answer = Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness
286. During radiography test, which region absorbs less radiation and transmits more?.
A. Low and high density regions absorb and transmit same amount of radiation.
B. High density region.
C. Low density region.
D. Low and high density regions adsorb.
Answer = Low density region
287. Which of the following compound is used for fine polishing?.
A. Aluminum oxide.
B. Nitric oxide.
C. Silicon carbide.
D. Iron oxide.
Answer = Aluminum oxide
288. Which among the following is not a type of Non-destructive testing?.
A. Compression test.
B. Visual testing.
C. Ultrasonic testing.
D. Eddy current testing.
Answer = Compression test
289. What is nondestructive test?.
A. Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness.
B. Nondestructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing.
C. Nondestructive tests are applications for detecting flaws in materials with impairing their usefulness.
D. Nondestructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing.
Answer = Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness
290. Which test is used to determine dimensions of any object?.
A. Ultrasonic test.
B. Torsion test.
C. Eddy current test.
D. Compression test.
Answer = Eddy current test
291. During radiography test, which region absorbs less radiation and transmits more?.
A. Low and high density regions absorb and transmit same amount of radiation.
B. High density region.
C. Low density region.
D. Low and high density regions adsorb.
Answer = Low density region
292. Which of the following statements is/are true for ultrasonic test?.
A. Equipment used for ultrasonic testing is portable.
B. Complicated shapes can be easily scanned.
C. Waves generated are health hazardous.
D. Waves generated are health hazardous and complicated shapes can be easily scanned.
Answer = Equipment used for ultrasonic testing is portable
293. Which among the following is the last step in magnetic particle test method?.
A. Observation and inspection.
B. Circular magnetization.
C. Demagnetization.
D. Magnetization.
Answer = Demagnetization
294. In which type of test the capillary action principle is used?.
A. Probe test.
B. Bend liquid test.
C. Dye penetrant test.
D. Torsion test.
Answer = Dye penetrant test
295. Which test can be performed without skilled labour?.
A. Probe test.
B. Bend liquid test.
C. Dye penetrant test.
D. Torsion test.
Answer = Dye penetrant test
296. What is the first step involved in the process of preparation of test sample of material?.
A. Rough polishing.
B. Fine grinding.
C. Fine polishing.
D. Etching.
Answer = Fine grinding
297. Which of the following compound is used for fine polishing?.
A. Aluminum oxide.
B. Nitric oxide.
C. Silicon carbide.
D. Iron oxide.
Answer = Aluminum oxide
298. Which cement is used in sewage and water treatment plants?.
A. Rapid Hardening Cement.
B. Low Heat Cement.
C. Sulphate Resisting Cement.
D. Quick Setting Cement.
Answer = Sulphate Resisting Cement
299. Which cement is used for mainly building construction where strength required with age?.
A. Rapid Hardening Cement.
B. Low Heat Cement.
C. Portland Pozzolana Cement.
D. Quick Setting Cement.
Answer = Portland Pozzolana Cement
300. Which cement is used for artificial marble?.
A. Rapid Hardening Cement.
B. Sulphate Resisting Cement.
C. Coloured Cement.
D. Quick Setting Cement.
Answer = Coloured Cement
301. Which cement is used to create bond with old concrete surface?.
A. Rapid Hardening Cement.
B. Expansive Cement.
C. Sulphate Resisting Cement.
D. Low Heat Cement.
Answer = Expansive Cement
302. Which cement is used to store for longer duration in wet climatic conditions?.
A. Expansive Cement.
B. Ordinary Portland cement.
C. Hydrophobic Cement.
D. Quick Setting Cement.
Answer = Hydrophobic Cement
303. Which cement used in frost resistance concrete?.
A. OPC.
B. PPC.
C. AEC.
D. QSC.
Answer = AEC
304. Which cement is used for the construction of water-retaining structure like tanks, reservoirs, retaining walls, swimming pools, dams, bridges, piers etc?.
A. Waterproof Portland cement.
B. Colored Cement.
C. High Alumina Cement.
D. Low Heat Cement.
Answer = Waterproof Portland cement
305. ____ cement is used for formwork that can be removed earlier and reused in other areas which save the cost of formwork..
A. Rapid Hardening Cement.
B. Colored Cement.
C. High Alumina Cement.
D. Low Heat Cement.
Answer = Rapid Hardening Cement
306. Which cement is mainly used for interior and exterior decorative works?.
A. Rapid Hardening Cement.
B. Colored Cement.
C. High Alumina Cement.
D. Low Heat Cement.
Answer = Colored Cement
307. For quality control of Portland cement, the test essentially done is.
A. setting time.
B. soundness.
C. tensile strength.
D. all the above..
Answer = all the above.
308. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,.
A. 0.2.
B. 0.25.
C. 0.3.
D. 0.35.
Answer = 0.25
309. Under normal conditions using an ordinary cement, the period of removal of the form work, is :.
A. 7 days for beam soffits.
B. 14 days for bottom slabs of spans 4.6 m and more.
C. 21 days for bottom beams over 6 m spans.
D. all the above..
Answer = all the above.
310. For given water content, workability decreases if the concrete aggregates contain an excess of.
A. thin particles.
B. flat particles.
C. elongated particles.
D. all the above..
Answer = all the above.
311. M10 grade of concrete approximates.
A. 1 : 3 : 6 mix.
B. 1 : 1 : 2 mix.
C. 1 : 2 : 4 mix.
D. 1 : 1.5 : 3 mix.
Answer = 1 : 3 : 6 mix
312. For ensuring quality of concrete, use.
A. single sized aggegates.
B. two sized aggregate.
C. graded aggregates.
D. coarse aggregates..
Answer = graded aggregates
313. According to I.S. : 456, the number of grades of concrete mixes, is.
A. 3.0.
B. 4.0.
C. 5.0.
D. 7.0.
Answer = 7.0
314. The mixture of different ingredients of cement, is burnt at.
A. 1000°C.
B. 1200°C.
C. 1400°C.
D. 1600°C.
Answer = 1400°C
315. The risk of segregation is more for.
A. wetter mix.
B. larger proportion of maximum size aggregate.
C. coarser grading.
D. all the above..
Answer = all the above.
316. After casting, an ordinary cement concrete on drying.
A. expands.
B. mix.
C. shrinks.
D. none of these..
Answer = shrinks
317. Hydration of cement is due to chemical action of water with.
A. Tricalcium silicate and dicalcium silicate.
B. Dicalcium silicate and tricalcium aluminate.
C. Tricalcium aluminate and tricalcium alumino ferrite.
D. All the above..
Answer = All the above.
318. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between.
A. 1100° and 1200°C.
B. 1200° and 1300°C.
C. 1300° and 1400°C.
D. 1400° and 1500°C.
Answer = 1400° and 1500°C
319. Permissible compressive strength of M 300 concrete grade is.
A. 100 kg/cm2.
B. 150 kg/cm2.
C. 200 kg/cm2.
D. 300 kg/cm2.
Answer = 300 kg/cm2
320. The standard sand now a days used in India, is obtained from.
A. Jaipur (Rajasthan).
B. Jullundur (Punjab).
C. Hyderabad (Andhra Pradesh).
D. Ennore (Madras).
Answer = Ennore (Madras)
321. The maximum amount of dust which may be permitted in aggregates is.
A. 5% of the total aggregates for low workability with a coarse grading.
B. 10% of the total aggregates for low workability with a fine grading.
C. 20% of the total aggregates for a mix having high workability with fine grading.
D. all the above..
Answer = all the above.
322. Proper proportioning of concrete, ensures.
A. desired strength and workability.
B. desired durability.
C. water tightness of the structure.
D. all the above..
Answer = all the above.
323. The bulk density of aggregates does not depend upon :.
A. size and shape of aggregates.
B. specific gravity of aggregates.
C. grading of aggregates.
D. size and shape of the container.
Answer = size and shape of the container
324. Curing.
A. reduces the shrinkage of concrete.
B. preserves the properties of concrete.
C. prevents the loss of water by evaporation.
D. all of the above..
Answer = all of the above.
325. While compacting the concrete by a mechanical vibrator, the slump should not exceed.
A. 2.5 cm.
B. 5.0 cm.
C. 7.5 cm.
D. 10 cm.
Answer = 5.0 cm
326. Construction joints are provided.
A. where B.M. and S.F. are small.
B. where the member is supported by other member.
C. at 18 m apart in huge structures.
D. all the above..
Answer = all the above.
327. An aggregate is said to be flaky if its least dimension is less than.
A. 1/5th of mean dimension.
B. 2/5th of mean dimension.
C. 3/5th of mean dimension.
D. 4/5th of mean dimension.
Answer = 3/5th of mean dimension
328. The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning.
A. 31-Dec-1899.
B. 31-Dec-1899.
C. 31-Dec-1899.
D. 31-Dec-1899.
Answer = 31-Dec-1899
329. The increased cohesiveness of concrete, makes it.
A. less liable to segregation.
B. more liable to segregation.
C. more liable to bleeding.
D. more liable for surface scaling in frosty weather.
Answer = less liable to segregation
330. The ratio of the length to breadth of a wooden float, is.
A. 4.5.
B. 5.5.
C. 6.5.
D. 7.5.
Answer = 7.5
331. To ensure constant moisture content in aggregates.
A. area of each aggregate pile should be large.
B. height of each aggregate pile should not exceed 1.50 m.
C. aggregate pile should be left for 24 hours before aggregates are used.
D. all the above..
Answer = all the above.
332. Workability improved by adding.
A. air-entraining agent.
B. foaming agent.
C. oily-agent.
D. all the above..
Answer = all the above.
333. The commonly used material in the manufacture of cement is.
A. sand stone.
B. slate.
C. lime stone.
D. graphite..
Answer = lime stone
334. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is.
A. 7.3.
B. 7.35.
C. 7.4.
D. 7.45.
Answer = 7.4
335. Curing a concrete for long period ensures better.
A. volume stability.
B. strength.
C. water resistance.
D. all the above..
Answer = all the above.
336. For the construction of cement concrete floor, the maximum permissible size of aggregate, is.
A. 4 mm.
B. 6 mm.
C. 8 mm.
D. 10 mm.
Answer = 10 mm
337. The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known.
A. grading.
B. curing.
C. mixing.
D. batching.
Answer = batching
338. Pick up the correct statement from the following:.
A. Insufficient quantity of water makes the concrete mix harsh.
B. Insufficient quantity of water makes the concrete unworkable.
C. Excess quantity of water makes the concrete segregated.
D. All the above..
Answer = All the above.
339. The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds.
A. 5 kg/cm2.
B. 8 kg/cm2.
C. 10 kg/cm2.
D. 15 kg/cm2.
Answer = 15 kg/cm2
340. Pick up the correct proportions of chemical ingredients of cement.
A. Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3.
B. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3.
C. Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3.
D. Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3.
Answer = Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
341. Transport of concrete by pumps, is done for a distance of.
A. 100 m.
B. 200 m.
C. 300 m.
D. 400 m.
Answer = 400 m
342. Slump test is done for.
A. clay.
B. sand.
C. lime.
D. concrete..
Answer = concrete.
343. The high strength of rapid hardening cement at early stage, is due to its.
A. finer grinding.
B. burning at high temperature.
C. increased lime cement.
D. higher content of tricalcium..
Answer = increased lime cement
344. Pick up the correct statement from the following:.
A. The weight of ingredients of concrete mix, is taken in kilograms.
B. Water and aggregates are measured in litres.
C. The finished concrete is measured in cubic metres.
D. All the above..
Answer = All the above.
345. Concrete mainly consists of.
A. cement.
B. aggregates.
C. admixture.
D. all the above..
Answer = all the above.
346. Vicat's apparatus is used for.
A. fineness test.
B. consistency test.
C. setting time test.
D. soundness test.
Answer = consistency test
347. M 150 grade of concrete approximates.
A. 1 : 3 : 6 mix.
B. 1 : 1 :2 mix.
C. 1 : 2 : 4 mix.
D. 1 : 1.5 : 3 mix.
Answer = 1 : 1 :2 mix
348. Workability of concrete is measured by.
A. Vicat apparatus test.
B. Slump test.
C. Minimum void method.
D. Talbot Richard test..
Answer = Slump test
349. The rock which is not calcareous, is :.
A. lime stone.
B. macl.
C. chalk.
D. laterite.
Answer = laterite
350. Internal friction between the ingredients of concrete, is decreased by using.
A. less water.
B. fine aggregates.
C. rich mix.
D. more water and coarse aggregates.
Answer = more water and coarse aggregates
351. For road pavements, the cement generally used, is.
A. ordinary Portland cement.
B. rapid hardening cement.
C. low heat cement.
D. blast furnace slag cement.
Answer = rapid hardening cement
352. Construction joints are generally provided in concrete.
A. roads.
B. retaining walls.
C. lining of canals.
D. all the above..
Answer = all the above.
353. Separation of coarse aggregates from mortar during transportation, is known.
A. bleeding.
B. creeping.
C. segregation.
D. shrinkage.
Answer = segregation
354. According to the recommendations of IS : 456-1978, the expansion joints.
A. are provided where plane changes abruptly.
B. are provided to ensure minimum resistance.
C. are supported on separate columns.
D. all the above..
Answer = all the above.
355. Grading of sand causes great variation in.
A. workability of concrete.
B. strength of concrete.
C. durability of concrete.
D. all the above..
Answer = all the above.
356. Shrinkage in concrete can be reduced by using.
A. low water cement ratio.
B. less cement in the concrete.
C. proper concrete mix.
D. all the above..
Answer = all the above.
357. Ordinary concrete is not used for concrete grade.
A. M 100.
B. M 150.
C. M 200.
D. M 400.
Answer = M 400
358. S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of.
A. coarse aggregates.
B. fine aggregates.
C. neither (a) nor (b).
D. both (a) and (b).
Answer = both (a) and (b)
359. Pick up the correct statement from the following:.
A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing.
B. The total water is the free water and the amount actually absorbed by the aggregates.
C. Neither (a) nor (b).
D. Both (a) and (b)..
Answer = Both (a) and (b).
360. Addition of pozzolana to ordinary port land cement, causes.
A. decrease in early strength.
B. reduction in chemical action with sulphates.
C. increase in shrinkage.
D. all the above..
Answer = all the above.
361. Too wet concrete may cause.
A. weakness of concrete.
B. excessive laitance.
C. segregation.
D. all the above..
Answer = all the above.
362. Addition of pozzolana to cement causes.
A. reduction in permeability.
B. loss of heat of hydration.
C. reduction in bleeding.
D. all the above..
Answer = all the above.
363. Hardening of cement occurs at.
A. rapid rate during the first few days and afterwards it continues to increase at a decreased rate.
B. slow rate during the first few days and afterwards it continues to increase at a rapid rate.
C. uniform rate throughout its age.
D. none of these..
Answer = none of these.
364. Pick up the correct statement from the following:.
A. Lime in excess, causes the cement to expand and disintegrate.
B. Silica in excess, causes the cement to set slowly.
C. Alumina in excess, reduces the strength of the cement.
D. All the above..
Answer = All the above.
365. Batching error means inaccuracy in the quantity of.
A. aggregates.
B. cement.
C. water.
D. all the above..
Answer = all the above.
366. Pick up the correct statement from the following i..
A. Higher workability indicates unexpected increase in the moisture content.
B. Higher workability indicates deficiency of sand.
C. If the concrete mix is dry, the slump is zero.
D. All the above..
Answer = All the above.
367. You are asked to construct a massive dam, the type of cement you will use, is.
A. ordinary Portland cement.
B. rapid hardening cement.
C. low heat cement.
D. blast furnace slag cement.
Answer = low heat cement
368. The produce impermeable concrete.
A. thorough mixing of concrete is required.
B. proper compaction of concrete is required.
C. proper curing of concrete is required.
D. all the above..
Answer = all the above.
369. Water required per bag of cement, is.
A. 7 kg.
B. 14 kg.
C. 21 kg.
D. 35 kg.
Answer = 35 kg
370. Pick up the incorrect statement from the following:.
A. The bottom and top ends of slump mould are parallel to each other.
B. The axis of the mould is perpendicular to the end faces.
C. The internal surface of the mould is kept clean and free from set cement.
D. The mould is in the form of a frustum of hexagonal pyramid.
Answer = The mould is in the form of a frustum of hexagonal pyramid
371. ISI has specified full strength of concrete after.
A. 7 days.
B. 14 days.
C. 21 days.
D. none of these..
Answer = none of these.
372. For construction of structures in sea water, the cement generally preferred to, is.
A. Portland-pozzolana cement.
B. quick setting cement.
C. low heat Portland cement.
D. rapid hardening cement.
Answer = Portland-pozzolana cement
373. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is.
A. 0.3.
B. 0.4.
C. 0.5.
D. 0.6.
Answer = 0.3
374. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:.
A. 70 litres of sand and 120 litres of aggregates.
B. 70 kg of sand and 140 litres of aggregates.
C. 105 litres of sand and 140 litres of aggregates.
D. 105 litres of sand and 210 litres of aggregates.
Answer = 105 litres of sand and 210 litres of aggregates
375. The process of hardening the concrete by keeping its surface moist is known.
A. placing.
B. wetting.
C. curing.
D. compacting.
Answer = curing
376. The grade of concrete not recommended by I.S. : 456, is.
A. M 100.
B. M 200.
C. M 300.
D. M 500.
Answer = M 500
377. R.R.I. charts are used to obtain a relatioship between strength of concrete and.
A. water cement ratio.
B. workability.
C. grading of aggregate.
D. fineness modulus.
Answer = water cement ratio
378. Proper batching ensures.
A. economy.
B. durability.
C. workability.
D. all the above..
Answer = all the above.
379. Workability of concrete for a given water content is good if the aggregates, are.
A. rounded aggregate.
B. irregular aggregate.
C. angular aggregate.
D. flaky aggregates..
Answer = rounded aggregate
380. Pick up the correct statement from the following:.
A. Bulking of sand is caused due to formation of a thin film of surface moisture.
B. Fine sand bulks more than coarse sand.
C. With 10% moisture content by weight, the bulking of sand is increased by 50%..
D. All the above..
Answer = All the above.
381. For compacting plain concrete road surface of thickness less than 20 cm, we use.
A. internal vibrator.
B. screed vibrator.
C. form vibrator.
D. none of these..
Answer = screed vibrator
382. Pick up the correct statement from the following:.
A. Construction joints are necessarily planned for their locations.
B. Expansion joints are provided to accommodate thermal expansion.
C. Construction joints are provided to control shrinkage cracks.
D. All the above..
Answer = All the above.
383. Pick up the correct statement from the following:.
A. Segregation is necessary for a workable concrete.
B. Consistency does not affect the workability of concrete.
C. If the slump increases, workability decreases.
D. None of these..
Answer = None of these.
384. Specified compressive strengh of concrete is obtained from cube tests at the end of.
A. 3 days.
B. 7 days.
C. 14 days.
D. 28 days..
Answer = 28 days.
385. An aggregate is said to be flaky, if its least dimension is less than.
A. 2/3 mean dimension.
B. 3/4 mean dimension.
C. 3/5 mean dimension.
D. 5/8 mean dimension.
Answer = 3/5 mean dimension
386. Pick up the incorrect statement from the following:.
A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water.
B. The strength of concrete decreases as the water cement ratio increases.
C. If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure.
D. Good compaction by mechanical vibrtions, increases the strength of concrete.
Answer = A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
387. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is.
A. 0.3.
B. 0.4.
C. 0.5.
D. 60%..
Answer = 0.5
388. The final operation of finishing floors, is known as.
A. screeding.
B. floating.
C. trowelling.
D. finishing.
Answer = trowelling
389. The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are.
A. 1500 bags.
B. 2000 bags.
C. 2500 bags.
D. 3000 bags.
Answer = 3000 bags
390. For an ordinary Portland cement.
A. residual does not exceed 10% when sieved through IS Sieve No. 9.
B. soundness varies from 5 to 10 mm.
C. initial setting time is not less than 30 minutes.
D. compressive stress after 7 days, is not less than 175 kg/cm2.
Answer = initial setting time is not less than 30 minutes
391. The maximum thickness of concrete floor of a cement warehouse, is.
A. 10 cm.
B. 15 cm.
C. 20 cm.
D. 25 cm.
Answer = 25 cm
392. A construction joint is provided where.
A. bending moment is small.
B. shear force is small.
C. the member is supported by other member.
D. all the above..
Answer = all the above.
393. The compaction of concrete, improves.
A. density.
B. strength.
C. durability.
D. all the above..
Answer = all the above.
394. Pick up the correct statement from the following:.
A. Water cement paste hardens due to hydration.
B. During hardening cement binds the aggregates together.
C. Cement provides strength, durability and water tightness to the concrete.
D. All the above..
Answer = All the above.
395. The light weight aggregates are obtained from.
A. sedimentary rocks.
B. metamorphic rocks.
C. igneous rocks.
D. volcanic source..
Answer = volcanic source.
396. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is.
A. 0.1.
B. 0.12.
C. 0.15.
D. 25%..
Answer = 25%.
397. Pick up the correct statement from the following:.
A. According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight.
B. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky.
C. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous.
D. All the above..
Answer = All the above.
398. Segregation is responsible for.
A. honey-combed concrete.
B. porous layers in concrete.
C. surface scaling in concrete.
D. all the above..
Answer = all the above.
399. Addition of pozzolana to cement.
A. decreases workability.
B. increases strength.
C. increases heat of hydration.
D. none of these..
Answer = none of these.
400. The datum temperature for maturity by Plowman, is.
A. 23°C.
B. 0°.
C. - 5.6°C.
D. - 11.7°C.
Answer = - 11.7°C
401. Pick up the incorrect statement from the following:.
A. The degree of grinding of cement, is called fineness.
B. The process of changing cement paste into hard mass, is known as setting of cement.
C. The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement.
D. The heat generated during chemical reaction of cement with water, is known as heat of hydration.
Answer = The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
402. Permissible compressive strength of M 150 concrete grade is.
A. 100 kg/cm2.
B. 150 kg/cm2.
C. 200 kg/cm2.
D. 250 kg/cm2.
Answer = 150 kg/cm2
403. Slump test of concrete is a measure ofits.
A. consistency.
B. compressive strength.
C. tensile strength.
D. impact value..
Answer = consistency
404. Pozzolana cement is used with confidence for construction of.
A. dams.
B. massive foundations.
C. abutments.
D. all the above..
Answer = all the above.
405. Water cement ratio is.
A. volume of water to that of cement.
B. weight of water to that of cement.
C. weight of concrete to that of water.
D. both (a) and (b) of the above..
Answer = both (a) and (b) of the above.
406. Efflorescence in cement is caused due to an excess of.
A. alumina.
B. iron oxide.
C. silica.
D. alkalis.
Answer = alkalis
407. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed.
A. 10 cm.
B. 15 cm.
C. 20 cm.
D. 25 cm.
Answer = 20 cm
408. The diameter of the Vicat plunger is 10 mm and its length varies from.
A. 20 mm to 30 mm.
B. 30 mm to 40 mm.
C. 40 mm to 50 mm.
D. 50 mm to 60 mm.
Answer = 40 mm to 50 mm
409. The shrinkage of concrete.
A. is proportional to water content is the mix.
B. is proportional to cement concrete.
C. increases with age of concrete.
D. all the above..
Answer = all the above.
410. Separation of water or water sand cement from a freshly concrete, is known.
A. bleeding.
B. creeping.
C. segregation.
D. flooding.
Answer = bleeding
411. Slump test of concrete is a meausre ofits.
A. consistency.
B. compressive strength.
C. tensile strength.
D. impact value..
Answer = consistency
412. According to Water-Cement Ratio Law, the strength of workable plastic concrete.
A. depends upon the amount of water used in the mix.
B. does not depend upon the quality of cement mixed with aggregates.
C. does not depend upon the quanity of cement mixed with aggregates.
D. all the above..
Answer = all the above.
413. Pick up the incorrect statement from the following:.
A. In properly graded aggregates, bulk density is more.
B. In single size aggregates, bulk density is least.
C. In single size aggregates, bulk density is maximum.
D. None of these..
Answer = In single size aggregates, bulk density is maximum
414. Saw dust can be rendered chemically inert by boiling it in water containing.
A. ferrous sulphate.
B. potassium chloride.
C. ammonia.
D. nitric acid.
Answer = ferrous sulphate
415. Pick up the correct statement from the following:.
A. High percentage of C3S and low percentage of C2S cause rapid hardening.
B. High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack.
C. Low percentage of C3S and high percentage of C2S contribute to slow hardening.
D. All the above..
Answer = All the above.
416. The factor which affects workability, is.
A. water content and its temperature.
B. shape and size of the aggregates.
C. grading and surface textures of the aggregates.
D. all the above..
Answer = all the above.
417. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as.
A. low-heat Portland cement.
B. rapid hardening Portland cement.
C. Portland blast slag cement.
D. Portland pozzolana cement.
Answer = low-heat Portland cement
418. Pick up the correct statement from the following:.
A. Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones.
B. Concrete using sand stones, cracks due to excessive shrinkage.
C. Very hard and close grained crystallined lime stones are suitable aggregates but provide low strength.
D. All the above..
Answer = All the above.
419. Pick up the correct statement from the following:.
A. Water enables chemical reaction to take place with cement.
B. Water lubricates the mixture of gravel, sand and cement.
C. Only a small quantity of water is required for hydration of cement.
D. All the above..
Answer = All the above.
420. Pick up the incorrect statement applicable to the field test of good cement..
A. When one thrusts one's hand into a bag of cement, one should feel warm.
B. The colour of the cement is bluish.
C. A handful of cement thrown into a bucket of water should sink immediately.
D. All the above..
Answer = All the above.
421. Pick up the correct statement from the following:.
A. Calcium chloride acts as a retarder.
B. Gypsum (calcium sulphate) acts as an accelerator.
C. Gypsum (calcium sulphate) acts as a retarder.
D. Both (c) and (d)..
Answer = Both (c) and (d).
422. Joints in concrete structures, are provided.
A. to reduce the tensile stresses likely to be developed due to evaporation of water.
B. to minimise the change in the dimensions of the slab.
C. to minimise the necessary cracking.
D. all the above..
Answer = all the above.
423. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is.
A. 15, 900 litres.
B. 16, 900 litres.
C. 17, 900 litres.
D. 18, 900 litres.
Answer = 18, 900 litres
424. The condition not applicable to water cement ratio law, is.
A. internal moisture conditions on hydration continue till complete strength is gained.
B. concrete specimens may be tested at any temperature.
C. concrete specimens need be of same age.
D. concrete specimens need be of same size.
Answer = concrete specimens may be tested at any temperature
425. High temperature.
A. increases the strength of concrete.
B. decreases the strength of concrete.
C. has no effect on the strength of concrete.
D. none of these..
Answer = decreases the strength of concrete
426. The bulk density of aggregates, is generally expressed as.
A. tonnes/cubic metre.
B. kg/cubic metre.
C. kg/litre.
D. g/cm3.
Answer = kg/litre
427. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is.
A. 100 kg/cm2.
B. 150 kg/cm2.
C. 200 kg/cm2.
D. 250 kg/cm2.
Answer = 150 kg/cm2
428. Allowable shear strength of concrete, depends upon.
A. shear strength.
B. tensile strength.
C. compressive strength.
D. none of these..
Answer = shear strength
429. The most useless aggregate is one whose surface texture is.
A. smooth.
B. granular.
C. glassy.
D. honey combed and porous..
Answer = glassy
430. To obtain a very high strength concrete, use very fine grained.
A. Granite.
B. Magnetite.
C. Barite.
D. Volcanic scoria..
Answer = Granite
431. Concrete containing.
A. silicious aggregates, has higher co-efficient of expansion.
B. igneous aggregates, has intermediate coefficient of expansion.
C. lime stones, has lowest co-efficient of expansion.
D. All the above..
Answer = All the above.
432. An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than.
A. 0.05.
B. 0.1.
C. 0.15.
D. 0.2.
Answer = 0.1
433. The top diameter, bottom diameter and the height of a slump mould are :.
A. 10 cm, 20 cm, 30 cm.
B. 10 cm, 30 cm, 20 cm.
C. 20 cm, 10 cm, 30 cm.
D. 20 cm, 30 cm, 10 cm.
Answer = 10 cm, 20 cm, 30 cm
434. Workability of concrete mix with low water cement ratio is determined by.
A. tensile strength test.
B. slump test.
C. compaction factor test.
D. flexural strength test.
Answer = compaction factor test
435. While designing an air entrained concrete.
A. water cement ratio is reduced.
B. proportion of aggregates is reduced.
C. an allowance for the entrained air is made.
D. all the above..
Answer = all the above.
436. For concreting tunnel linings, tran-portation of concrete is done by.
A. pans.
B. wheel borrows.
C. containers.
D. pumps.
Answer = pumps
437. The operation of removing humps and hollows of uniform concrete surface, is known as.
A. floating.
B. screeding.
C. trowelling.
D. finishing.
Answer = screeding
438. The void ratio of.
A. single size coarse aggregate is roughly 0.45..
B. graded coarse aggregate is roughly 0.040.
C. fine aggregate is roughly 0.45.
D. all the above..
Answer = all the above.
439. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is.
A. rounded aggregate.
B. irregular aggregate.
C. angular aggregate.
D. flaky aggregate.
Answer = rounded aggregate
440. The type of aggregates of same nominal size, which contain less voids when compacted, are.
A. rounded spherical.
B. irregular.
C. flaky.
D. none of these..
Answer = rounded spherical
441. For the construction of cement con-certe dams, the maximum permissible size of the aggregates, is.
A. 40 mm.
B. 50 mm.
C. 60 mm.
D. 70 mm.
Answer = 40 mm
442. Permissible compressive strength of M 200 concrete grade is.
A. 100 kg/cm2.
B. 150 kg/cm2.
C. 200 kg/cm2.
D. 250 kg/cm2.
Answer = 200 kg/cm2
443. For preparing a test-specimen, it is necessary.
A. to mix cement and fine aggregate by dry hand.
B. to mix coarse aggregates.
C. to mix water to the cement, fine aggregates and coarse aggregates.
D. all the above..
Answer = all the above.
444. The aggregate containing moisture in pores and having its suface dry, is known as.
A. moist aggregates.
B. very dry aggregates.
C. dry aggregates.
D. saturated surface dry aggregate.
Answer = saturated surface dry aggregate
445. The commercial name of white and coloured cement in India, is.
A. colocrete.
B. rainbow cement.
C. silvicrete.
D. all the above..
Answer = all the above.
446. Pick up the correct statement from the following:.
A. An increase in water content must be accompanied by an increase in cement content.
B. Angular and rough aggregates reduce the workability of the concrete.
C. Large size aggregates increase the workability due to lesser surface area.
D. All the above..
Answer = All the above.
447. To hydrate 500kg of cement full water needed, is.
A. 100 kg.
B. 110 kg.
C. 120 kg.
D. 130 kg.
Answer = 130 kg
448. Concrete gains strength due to.
A. chemical reaction of cement with sand and coarse aggregates.
B. evaporation of water from concrete.
C. hydration of cement.
D. All the above..
Answer = hydration of cement
449. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than.
A. 20.5 mm.
B. 30.5 mm.
C. 40.5 mm.
D. 50.5 mm.
Answer = 40.5 mm
450. Non-uniform compaction may cause the concrete.
A. porous.
B. non-homogeneous.
C. reduced strength.
D. all the above..
Answer = all the above.
451. Log Angles machine is used to test the aggregate for.
A. crushing strength.
B. impact value.
C. abrasion resistance.
D. water absorption.
Answer = abrasion resistance
452. If fineness modulus of sand is 2.5, it is graded as.
A. very fine sand.
B. fine sand.
C. medium sand.
D. coarse sand.
Answer = fine sand
453. Pozzolanic properties exist in.
A. shales.
B. fly ash.
C. pumicite.
D. all the above..
Answer = all the above.
454. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than.
A. 22.5 mm.
B. 18.5 mm.
C. 16.5 mm.
D. 13.5 mm..
Answer = 13.5 mm.
455. Expansion joints are provided if the length of concrete structures exceeds.
A. 10 m.
B. 15 m.
C. 15 m.
D. 45 m.
Answer = 45 m
456. Workability improved by adding.
A. fly ash.
B. hydrated lime.
C. calcium chloride.
D. all the above..
Answer = all the above.
457. If the slump of a concrete mix is 60 mm, its workability is.
A. very low.
B. low.
C. medium.
D. high.
Answer = medium
458. Pick up the correct statement from the following:.
A. Sand obtained from pits, is washed to remove clay and silt.
B. Sand obtained from flooded pits, need not be washed before use.
C. Sea shore sand contains chlorides which cause effloresance.
D. All the above..
Answer = All the above.
459. The strength and quality of concrete, depend upon:.
A. grading of aggregates.
B. surface area of aggregates.
C. shape of aggregates.
D. all the above..
Answer = all the above.
460. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than.
A. 30 minutes.
B. 40 minutes.
C. 60 minutes.
D. 75 minutes.
Answer = 30 minutes
461. Pick up the incorrect statement from the following. While performing preliminary test on concrete.
A. proportions of the material and water should be the same as to be used at the work site.
B. cement should be mixed by hand in order to maintain uniformity.
C. concrete mix should be stored in air-tight containers.
D. concrete ingredients should be kept at a temperature of 37° ± 2°C.
Answer = concrete ingredients should be kept at a temperature of 37° ± 2°C
462. Sand requiring a high water cement ratio, belongs to.
A. Zone I.
B. Zone II.
C. Zone III.
D. Zone IV..
Answer = Zone I
463. Ordinary Portland cement is manufactured from.
A. lime stone and clay.
B. gypsum and lime.
C. pozzolana.
D. lime, pozzolana and clay..
Answer = gypsum and lime
464. A flaky aggregate is said to be elongated if its length is.
A. equal to the mean size.
B. twice the mean size.
C. thrice the mean size.
D. four times the mean size.
Answer = twice the mean size
465. To prevent segregation, the maximum height for placing concrete, is.
A. 100 cm.
B. 125 cm.
C. 150 cm.
D. 200 cm.
Answer = 100 cm
466. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is.
A. M 100.
B. M 150.
C. M 200.
D. M 250.
Answer = M 100
467. Water cement ratio is generally expressed in volume of water required per.
A. 10 kg.
B. 20 kg.
C. 30 kg.
D. 50 kg.
Answer = 50 kg
468. For a good concrete.
A. aggregates should be hard and durable.
B. cement should be sufficient to produce the required strength.
C. water should be free from organic materials.
D. All the above..
Answer = All the above.
469. If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is.
A. 2000 bags.
B. 2200 bags.
C. 2400 bags.
D. 2700 bags.
Answer = 2700 bags
470. Gypsum is added for.
A. colour.
B. strength.
C. controlling setting time.
D. none of these..
Answer = controlling setting time
471. A concrete having a slump of 6.5 cm, is said to be.
A. dry.
B. earth moist.
C. semi-plastic.
D. plastic.
Answer = plastic
472. Strength of concrete with passage of time.
A. increases.
B. decreases.
C. fluctuates.
D. remains constant..
Answer = increases
473. Cement used for normal concrete construction, is obtained by burning a mixture of.
A. silicious and argillaceous materials.
B. argilaceous and calcareous materials.
C. silicious and catcareous materials.
D. silicious, argillaceous and calcareous materials.
Answer = silicious, argillaceous and calcareous materials
474. Pick up the correct statement from the following:.
A. The concrete gains strength due to hydration of cement.
B. The concrete cured at a temperature below 23°C, gains strength up to 28 days.
C. The concrete does not set at freezing point.
D. All the above..
Answer = All the above.
475. Pick up the incorrect statement from the following:.
A. Admixtures accelerate hydration.
B. Admixtures make concrete water proof.
C. Admixtures make concrete acid proof.
D. Admixtures give high strength.
Answer = Admixtures accelerate hydration
476. Higher workability of concrete is required if the structure is.
A. made with cement concrete.
B. thick and reinfored.
C. thin and heavily reinforced.
D. thick and heavily reinfored..
Answer = thick and heavily reinfored.
477. Setting time of cement increases by adding.
A. gypsum.
B. hydrogen peroxide.
C. calcium chloride.
D. sodium oxide.
Answer = gypsum
478. The dimensions of a 35 litre forma for measuring aggregates by volume, are :.
A. length 30 cm, breadth 25 cm, height 30 cm.
B. length 39 cm, breadth 25 cm, height 32 cm.
C. length 27 cm, breadth 27 cm, height 48 cm.
D. length 220 cm, breadth 25 cm, height 40 cm.
Answer = length 27 cm, breadth 27 cm, height 48 cm
479. The shuttering of a hall measuring 4 m x 5 m, can be removed after.
A. 5 days.
B. 7 days.
C. 10 days.
D. 14 days.
Answer = 7 days
480. Pick up the correct statement from the following:.
A. There should not be any loss of cement from the charged drum of the mixer.
B. Cement should be mixed for at least one minute.
C. 10% of water is placed in the rotating drum before adding dry material.
D. All the above..
Answer = All the above.
481. If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is.
A. 8 kg.
B. 10 kg.
C. 12 kg.
D. 14 kg.
Answer = 12 kg
482. The entrained air in concrete.
A. increases workability.
B. decreases workability.
C. decreases resistance to weathering.
D. increases strength.
Answer = increases workability
483. Pick up the incorrect statement from the following:.
A. Tricalcium silicate (C3S) hydrates rapidly.
B. Tricalcium silicate (C3S) generates more heat of hydration.
C. Tricalcium silicate (C3S) develops early strength.
D. Tricalcium silicate (C3S) has more resistance to sulphate attack.
Answer = Tricalcium silicate (C3S) has more resistance to sulphate attack
484. Permissible compressive strength of M 200 concrete grade is.
A. 100 kg/cm2.
B. 150 kg/cm2.
C. 200 kg/cm2.
D. 250 kg/cm2.
Answer = 200 kg/cm2
485. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for.
A. 20 times.
B. 25 times.
C. 30 times.
D. 40 times.
Answer = 25 times
486. If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is.
A. 0.1.
B. 0.125.
C. 0.15.
D. 0.185.
Answer = 0.125
487. For preparing ordinary concrete, the quantity of water used, is.
A. 5% by weight of aggregates plus 20% of weight of cement.
B. 10% by weight of aggregates plus 10% of weight of cement.
C. 5% by weight of aggregates plus 30% of weight of cement.
D. 30% by weight of aggregates plus 10% of weight of cement.
Answer = 5% by weight of aggregates plus 30% of weight of cement
488. According to IS : 382-1963, a good aggregate should be.
A. chemically inert.
B. sufficiently strong.
C. hard and durable.
D. all the above..
Answer = all the above.
489. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be.
A. between 150 to 300 kg/cm2.
B. between 350 to 600 kg/cm2.
C. between 150 to 500 kg/cm2.
D. below 200 kg/cm2.
Answer = below 200 kg/cm2
490. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation.
A. 0.1P + 0.3Y + 0.1Z = W/C x P.
B. 0.3P + 0.1Y + 0.01Z = W/C x P.
C. 0.4P + 0.2Y + 0.01Z = W/C x P.
D. 0.5P + 0.3Y + 0.01Z = W/C x P.
Answer = 0.3P + 0.1Y + 0.01Z = W/C x P
491. For the construction of thin R.C.C. structures, the type of cement to be avoided, is.
A. ordinary Portland cement.
B. rapid hardening cement.
C. low heat cement.
D. blast furnace slag cement.
Answer = blast furnace slag cement
492. Vicat apparatus is used for.
A. fineness test.
B. consistency test.
C. test for setting time.
D. test for tensile strength.
Answer = consistency test
493. Pick up the incorrect statement from the following:.
A. Space between the exterior walls of a warechouse and bag piles should be 30 cm.
B. Cement bags should preferably be piled on wooden planks.
C. Cement bags should be placed such that bags of one layer does not touch the bags of the adjacent layer.
D. None of these..
Answer = None of these.
494. An ideal ware house, is provided.
A. water proof masonry walls.
B. water proof roof.
C. few windows which remain generally closed.
D. all the above..
Answer = all the above.
495. Concrete is unsuitable for compaction by a vibrator if it is.
A. dry.
B. earth moist.
C. semi-plastic.
D. plastic.
Answer = plastic
496. Inert material of a cement concrete mix, is.
A. water.
B. cement.
C. aggregate.
D. none of these..
Answer = aggregate
497. Sands of zone I are.
A. coarse.
B. medium.
C. medium to fine.
D. fine..
Answer = coarse
498. The lower water cement ratio in concrete, introduces.
A. smaller creep and shrinkage.
B. greater density and smaller permeability.
C. improved frost resistance.
D. all the above..
Answer = all the above.
499. The cement becomes useless if its absorbed moisture content exceeds.
A. 0.01.
B. 0.02.
C. 0.03.
D. 0.05.
Answer = 0.05
500. A concrete using an air entrained cement.
A. has strength less than 10% to 15%.
B. has more resistance to weathering.
C. is more plastic and workable.
D. is free from segregation and bleeding.
Answer = is more plastic and workable
501. Pick up the correct statement from the following:.
A. The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm.
B. The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm.
C. The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt.
D. All the above..
Answer = All the above.
502. Placing of concrete should preferably be done at a temperature of.
A. 0°C.
B. 10°C.
C. 20°C.
D. 27 ± 2°C.
Answer = 27 ± 2°C
503. The aggregate impact value of the aggregate used in.
A. building concrete is less than 45.
B. road pavement concrete is less than 30.
C. runway concrete is less than 30.
D. all the above..
Answer = all the above.
504. The maximum percentage of chemical ingredient of cement is that of.
A. magnesium oxide.
B. iron oxide.
C. aluminium.
D. lime.
Answer = lime
505. Pick up the incorrect statement from the following:.
A. Workability of the concrete mix decreases with an increase in the moisture content.
B. Concrete for which preliminary tests are conducted, is called controlled concrete.
C. Bulking of sand depends upon the fineness of grains.
D. All the above..
Answer = All the above.
506. Sand generally contains salt if it is obtained from:.
A. nala beds.
B. river beds.
C. sea beds.
D. all the above.
Answer = sea beds
507. The impurity of mixing water which affects the setting time and strength of concrete, is.
A. sodium sulphates.
B. sodium chlorides.
C. sodium carbonates and bicarbonates.
D. calcium chorides.
Answer = sodium carbonates and bicarbonates
508. Pick up the correct statement from the following:.
A. Continuous grading is not necessary for obtaining a minimum of air voids.
B. The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve.
C. The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation.
D. All the above..
Answer = All the above.
509. Di-calcium silicate (C2S).
A. hydrates rapidly.
B. generates less heat of hydration.
C. hardens rapidly.
D. provides less ultimate strength to cement.
Answer = generates less heat of hydration
510. On a grading curve, the gap grading is represented by.
A. a horizontal line.
B. a vertical line.
C. N.W. inclined line.
D. None of the mentioned.
Answer = a horizontal line
511. Bulking of sand is.
A. mixing of different sizes of sand particles.
B. mixing of lime with sand.
C. maximum water with sand.
D. swelling of sand when wetted..
Answer = swelling of sand when wetted.
512. Curing of pavements, floors, roofs and slabs, is done by.
A. membrane method.
B. ponding method.
C. covering surface with bags.
D. sprinkling water method.
Answer = ponding method
513. Pick up the incorrect statement from the following:.
A. With passage of time, the strength of cement increases.
B. With passage of time, the strength of cement decreases.
C. After a period of 24 months, the strength of cement reduces to 50%.
D. The concrete made with storage deteriorated cement, gains strength with time.
Answer = With passage of time, the strength of cement increases
514. The surface where two successive placements of concrete meet, is known as.
A. Contraction joint.
B. Expansion joint.
C. Construction joint.
D. both (a) and (b).
Answer = Construction joint
515. An excess of flaky particles in concrete aggregates.
A. decreases the workability.
B. increases the quantity of water and sand.
C. affects the durability of concrete.
D. all the above..
Answer = all the above.
516. S.I. has specified the full strength of concrete after.
A. 7 days.
B. 14 days.
C. 21 days.
D. 28 days.
Answer = 28 days
517. For given workability the grading requiring the least amount of water is one that gives.
A. greatest surface area for the given cement and aggregates.
B. least surface area for the given cement and aggregates.
C. least weight for the given cement and aggregates.
D. greatest weight for the given cement and aggregates.
Answer = greatest surface area for the given cement and aggregates
518. The minimum percentage of chemical ingredient of cement is that of.
A. magnesium oxide.
B. iron oxide.
C. alumina.
D. lime.
Answer = magnesium oxide
519. The specifications of a cement bag for storage, are.
A. weight 50 kg.
B. height 18 cm.
C. plan area 3000 sq. cm.
D. all the above..
Answer = all the above.
520. The bulk density of aggregates, depends upon.
A. shape.
B. grading.
C. compaction.
D. all the above..
Answer = all the above.
521. Pick up the correct statement from the following:.
A. The bulk density of fine aggregate is usually about 10 per cent more than that of coarse aggregate of similar composition.
B. The specific gravity of aggregate is important for the determination of the moisture content.
C. The absorption and porosity of an aggregate influence the property of the concrete.
D. All the above..
Answer = All the above.
522. Horizontal construction joints in concrete walls are generally provided at.
A. soffit level.
B. window sill level.
C. floor level.
D. all the above..
Answer = all the above.
523. Pick up the correct statement from the following:.
A. Construction joints in columns are provided a few cm below the junction of beam.
B. Construction joints in columns are provided at the bottom haunching.
C. Construction joints in beams and slabs are provided within middel third.
D. All the above..
Answer = All the above.
524. For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is.
A. 10 kg.
B. 12 kg.
C. 14 kg.
D. 16 kg.
Answer = 14 kg
525. The concrete mix which causes difficulty in obtaining a smooth finish, possess.
A. segregation.
B. internal friction.
C. hardness.
D. bleeding.
Answer = hardness
526. Le-Chatelier's apparatus is used for testing.
A. soundness of cement.
B. hardness of cement.
C. strength of cement.
D. durability of cement..
Answer = soundness of cement
527. 'Ware house pack' of cement means.
A. full capacity of the ware house.
B. pressure exertion of the bags of upper layers.
C. pressure compaction of the bags on lower layers.
D. packing the ware house.
Answer = pressure compaction of the bags on lower layers
528. In the method of voids for determination of the quantity of cement paste, it is assumed that.
A. Voids in coarse aggregates are filled by fine aggregates.
B. Voids in fine aggregates are filled by the cement paste.
C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra.
D. All the above..
Answer = All the above.
529. If a grading curve is horizontal bet-wen the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain.
A. 20 mm particles.
B. 10 mm particles.
C. 4.75 mm particles.
D. all the above..
Answer = all the above.
530. The size of fine aggregates does not exceed.
A. 2.75 mm.
B. 3.00 mm.
C. 3.75 mm.
D. 4.75 mm.
Answer = 4.75 mm
531. An aggregate is known as cyclopean aggregate if its size is more than.
A. 4.75 mm.
B. 30 mm.
C. 60 mm.
D. 75 mm.
Answer = 75 mm
532. The main object of compaction of concrete, is:.
A. to eliminate air holes.
B. to achieve maximum density.
C. to provide initimate contact between the concrete and embedded materials.
D. all the above..
Answer = all the above.
533. Pick up the correct statement from the following:.
A. The quality of water governs the strength of concrete.
B. The quantity of water required for concreting, depends upon the grading of aggregate amd method of compaction.
C. 10% excess of water reduces the strength of concrete by 15%.
D. All the above..
Answer = All the above.