Que- Work done by the force of friction is____________________?
a. always positive
b. always negative
c. positive only for small frictional force
d. positive only for large frictional force
Answer- always negative
Que- If velocity is doubled then__________________?
a. momentum increases 4 times and K.E increases 2 times
b. momentum and K.E. remain same
c. momentum increases 2 times and K.E increases constant
d. momentum increases 2 times and K.E increases 4 time
Answer- momentum increases 2 times and K.E increases 4 time
Que- Which of the following is not conservative force_________________?
a. friction
b. electric
c. gravitational
d. magnetic
Answer- friction
Que- The consumption of energy by a 60 watt bulb in 2 sec is_________________?
a. 120 J
b. 60 J
c. 30 J
d. 0.02 J
Answer- 120 J
Que- The escape velocity form the earth surface in km S-1 is____________________?
a. 4.2 km S-1
b. 7.5 km S-1
c. 9.5 km S-1
d. 1.1 km S-1
Answer- 1.1 km S-1
Que- If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________?
a. 1600 ms-1
b. 50.6 ms-1
c. 71.6 ms-1
d. 2263ms-1
Answer- 50.6 ms-1
Que- When arrow is released form its bow, its energy is transformed from _____________________?
a. heat energy to K.E
b. elastic P.E to K.E
c. elemical energy to elastic P.E
d. K.E to elastic P.E.
Answer- elastic P.E to K.E
Que- The work done by friction is__________________?
a. positive
b. negative
c. zero
d. none of these
Answer- negative
Que- Work done on the body equals to the _____________________?
a. change in its K.E always
b. change in its P.E always
c. change in its K.E and change in its P.E
d. neither change in K.E and nor change in its P.E
Answer- change in its K.E and change in its P.E
Que- The tides raise the mater in the see roughly in a day___________________?
a. once
b. twice
c. four time
d. eight time
Answer- twice
Que- The highest value of escape velocity in solar system is planet____________________?
a. Earth
b. Neptune
c. Jupiter
d. Moon
Answer- Jupiter
Que- Gravitational P.E of a body has____________________?
a. no formula
b. a formula mgh only
c. a formula
d. no general formula
Answer- no general formula
Que- When the speed of a moving body is doubled then___________________?
a. its K.E is doubled
b. its acceleration is doubled
c. its P.E is doubled
d. its momentum is doubled
Answer- its momentum is doubled
Que- One mega watt hour is equal to_________________?
a. 36 x 106 J
b. 36 x 1012 J
c. 36 x 109 J
d. 36 x 108 J
Answer- 36 x 108 J
Que- Work has the dimension as that of same as that of__________________?
a. torque
b. angular momentum
c. linear momentum
d. power
Answer- torque
Que- The relation between the escape velocity V esc and orbital speed Vo is given by________________?
a. V esc = 1/2Vo
b. V esc = -2 Vo
c. V esc = Vo
d. V esc = 2Vo
Answer- V esc = -2 Vo
Que- When two protons are brought together_____________________?
a. Kinetic energy increases
b. P.E. between them increases
c. P.E. between them decreases
d. P.E. between tem does not change
Answer- P.E. between them increases
Que- A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ?
a. man does more work than child
b. child does more work than man
c. both do the same amount of work
d. it is a foolish question
Answer- child does more work than man
Que- The area under the force displacement graph represents__________________?
a. area
b. work done
c. power
d. none of these
Answer- work done
Que- Propulsion force of a rocket is____________________?
a. non-conservative force
b. conservative force
c. both A and B
d. none of these
Answer- non-conservative force
Que- Geothermal energy is a _______________________ source of energy?
a. non-renewable
b. stable
c. renewable
d. none of the above
Answer- renewable
Que- ________________ cells converts solar energy into electrical energy?
a. rotory
b. photovoltaic
c. galvanic
d. non of these
Answer- photovoltaic
Que- Biomass can be converted into fuels by____________________?
a. direct combustion
b. fermentation
c. both A and B
d. none of these
Answer- both A and B
Que- Which of the following substances posses the highest elasticity ?
a. Rubber
b. Steel
c. Glass
d. Copper
Answer- Steel
Que- What are the dimensions of stress ?
a. MLT-2
b. ML-2T-1
c. ML-1T-2
d. ML-T-1
Answer- ML-1T-2
Que- Which one of the following physical quantities does not have the dimensions of force per unit area ?
a. Stress
b. Strain
c. Youngs modulus
d. Pressure
Answer- Strain
Que- A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?
a. FE
b. (FE)
c. FE2/L
d. FE2
Answer- (FE)
Que- When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?
a. Y∝
b. 2Y∝
c. Y∝/2
d. Y∝2
Answer- Y∝2
Que- A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?
a. 0.01J
b. 0.02J
c. 0.04J
d. 1.0J
Answer- 0.01J
Que- A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?
a. Stress/strain
b. (stress/strain)
c. Stress x strain
d. (Stress / strain)
Answer- (Stress / strain)
Que- The ration stress to strain in youngs modulus of the material then tension is__________________?
a. Directly proportional to extension
b. Directly proportional to strain
c. Directly proportional to square of amplitude
d. Inversely proportional to extension
Answer- Directly proportional to extension
Que- A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?
a. The extension of the wire is proportional to the force applied
b. The weight of the wire is negligible
c. The wire is not stretched beyond its elastic limit
d. The cross sectional area of the wire remains constant
Answer- The extension of the wire is proportional to the force applied
Que- Formation of large molecule by joining small molecules is_________________?
a. Fusion
b. Polymerization
c. Crystallization
d. Subtraction
Answer- Polymerization
Que- The energy band occupied by the valence electrons is called___________________?
a. Energy state
b. Valence band
c. ve energy state
d. conduction band
Answer- Valence band
Que- A ferromagnet will become fully magnetized at_________________?
a. High voltage A.C
b. Low voltage A.C
c. Alternating current at its peak value
d. D.C current at peak value
Answer- Alternating current at its peak value
Que- Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?
a. Semi conductor
b. Super conductors
c. Insulators
d. Conductor
Answer- Insulators
Que- The angular position of cells remains the same for a sample of a crystal. This property is called___________________?
a. Isotropy
b. Cleavage
c. Homogeneity
d. The external symmetry of form
Answer- The external symmetry of form
Que- If the density of atoms remain same along any direction in a crystal is called__________________?
a. Symmetry
b. Homogeneity
c. Isotropy
d. Cleavage
Answer- Homogeneity
Que- The band theory of solids explains satisfactorily the nature of_________________?
a. Electrical insulators alone
b. Electrical conductors alone
c. Electrical semi conductors alone
d. All of the above
Answer- All of the above
Que- A completely filled band is called__________________?
a. Conduction band
b. Valence band
c. Forbidden band
d. Core band
Answer- Core band
Que- Which one has the greatest energy gap ?
a. Semi conductor
b. Conductor
c. Metals
d. Non metals
Answer- Non metals
Que- With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?
a. Decreases
b. Increases
c. Remains same
d. First increases then decreases
Answer- Increases
Que- On the basis of band theory of solids the semiconductors have _____________________?
a. A party filled valence band and totally empty conduction band
b. A completely filled valence band a totally empty conduction band and a very wide forbidden band
c. A completely filled valence band a partially filled conduction band and a narrow forbidden band
d. A partly filled valence band a totally empty conduction band and a wide forbidden band
Answer- A completely filled valence band a partially filled conduction band and a narrow forbidden band
Que- Very weak magnetic fields are detected by___________________?
a. Squids
b. Magnetic resonance imaging (MRI)
c. Magnetometer
d. Oscilloscope
Answer- Squids
Que- Energy needed to magnetize and demagnetize is represented by _________________?
a. Hysteresis curve
b. Hysteresis loop area
c. Hysteresis loop
d. Straight line
Answer- Hysteresis loop area
Que- What is the SI unit of modulus of elasticity of substance ?
a. Nm-2
b. Jm-2
c. Nm-1
d. Being a number it has no unit.
Answer- Nm-2
Que- A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?
a. 2×108 Nm-2
b. 5×106 Nm-2
c. 0.5×10-6 Nm-2
d. 0.2×10-6Nm-2
Answer- 5×106 Nm-2
Que- A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?
a. 0.025J
b. 0.50J
c. 0.75J
d. 0.100J
Answer- 0.75J
Que- Materials that undergo plastic deformation before breaking are called __________________?
a. Brittle
b. Ductile
c. Amorphous
d. Polymers
Answer- Ductile
Que- A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
a. (F1+F2) (121+122)
b. (F1+F2) (122-112)
c. (F1+F2) (12-11)
d. (F1+F2) (12-11)
Answer- (F1+F2) (12-11)
Que- Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
a. Stiffness
b. Toughness
c. Extension
d. Deformation
Answer- Deformation
Que- The curie temperature is that at which ____________________?
a. Semi-conductor becomes conductors
b. Ferromagnetic becomes paramagnetic
c. Paramagnetic becomes diamagnetic
d. Metals become super conductor
Answer- Ferromagnetic becomes paramagnetic
Que- Coercive force is the force which opposes ____________________?
a. Demagnetization
b. Breakage
c. Extension
d. Surface cracking
Answer- Demagnetization
Que- The bulk properties of materials such as their mode of fracture can be related to their____________________?
a. Polymerization
b. Cleavage
c. Microstructure
d. Dislocation
Answer- Microstructure
Que- The breaking of crystals along definite direction is called _____________________?
a. Cleavage
b. Symmetry
c. Isotropy
d. Homogeneity
Answer- Cleavage
Que- In simple cube one atom or molecule lies at its______________________?
a. Force corners
b. Nine corners
c. Eight corners
d. Six corners
Answer- Eight corners
Que- A vacant or partially filled band is called _____________________?
a. Conduction band
b. Valence band
c. Forbidden band
d. Empty band
Answer- Conduction band
Que- The electrons in conduction band are free to___________________?
a. Transport vibrations
b. Transport signals
c. Transport charge
d. Transport impulses
Answer- Transport charge
Que- Many of the semi conductors are crystals of the type__________________?
a. Face centred cubic
b. Body centred cubic
c. Simple cubic
d. All of the above
Answer- Face centred cubic
Que- Holes can exist in____________________?
a. Conductors
b. Insulators
c. Semi conductors
d. All of the above
Answer- Semi conductors
Que- In a semiconductors the charge carriers are ___________________?
a. Holes only
b. Electrons only
c. Electron and holes both
d. All of the above
Answer- Electron and holes both
Que- The net charge on n-type material is____________________?
a. Positive
b. Negative
c. Both positive and negative
d. Neutral
Answer- Neutral
Que- Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
a. magnetic flux
b. magnetic field intensity
c. magnetic induction
d. self inductance
Answer- magnetic induction
Que- What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
a. 1A
b. 10A
c. 100A
d. 1000A
Answer- 100A
Que- Two parallel wires carrying currents in the opposite directions____________________?
a. repel each other
b. attract each other
c. have no effect upon each other
d. they cancel out their individual magnetic fields
Answer- repel each other
Que- A magnetic field___________________?
a. always exerts a force on a charged particle
b. never exerts a force on a charged particles
c. exerts a force if the charged particle is moving in the direction of the magnetic field lines
d. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Answer- exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Que- Which one of the following material is most suitable for making core of an electromagnet ?
a. air
b. steel
c. Cu-Ni alloy
d. soft iron
Answer- soft iron
Que- The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
a. 1T = 103 G
b. 1T = 10-4 G
c. 1T = 10-2 G
d. 1T = 104 G
Answer- 1T = 104 G
Que- SI unit of flux density is____________________?
a. NA-1m-1
b. NAm-1
c. NmA-1
d. NmA-2
Answer- NA-1m-1
Que- The standard vector symbol for flux density is ____________________?
a. M
b. L
c. H
d. B
Answer- L
Que- An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?
a. E = BeV
b. B = eE/V
c. E = BV
d. E = BeV/2
Answer- E = BV
Que- When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
a. zero
b. equal to the restoring couple
c. greater than the restoring couple
d. smaller than the restoring couple
Answer- equal to the restoring couple
Que- Which one of the following is not an electromechanical instrument ?
a. galvanometer
b. voltmeter
c. ammeter
d. AC transformer and DC generator
Answer- AC transformer and DC generator
Que- In a multi range ammeter as the range increases _____________________?
a. shunt value decreases
b. shunt value increases
c. shunt value remains the same
d. none of the above
Answer- shunt value decreases
Que- A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?
a. 2.0 mA
b. 20 mA
c. 200 mA
d. 0.2 mA
Answer- 2.0 mA
Que- Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
a. BINA cosa
b. BINA sina
c. BINA tana
d. BINA
Answer- BINA
Que- A galvanometer basically is an instrument used to ____________________?
a. detect current in a circuit
b. measure current flowing through a circuit
c. measure voltage across a circuit
d. measure potential difference between two points in a circuit
Answer- detect current in a circuit
Que- A wheat stone bridge is said to be balanced when____________________?
a. maximum current flows through the galvanometer branch
b. minimum current flows through the galvanometer branch
c. potential difference across galvanometer branch is maximum
d. potential difference across galvanometer branch is zero
Answer- potential difference across galvanometer branch is zero
Que- A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
a. independent mass m
b. directly proportional to m
c. directly proportional to q
d. directly proportional to B
Answer- directly proportional to B
Que- If a current carrying solenoid is suspended freely it will__________________?
a. be rotating
b. come to rest in N-S direction
c. vibrating like galvanometer needle
d. comes to rest after rotation
Answer- come to rest in N-S direction
Que- A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
a. F=1/B
b. F=1/Bsinθ
c. F/0
d. F=1/Bcosθ
Answer- F/0
Que- When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?
a. R=qB/mV
b. R=mV/qB
c. R=qmV/B
d. R=qmB/V
Answer- R=mV/qB
Que- A magnetic compass will be deflected if it is kept near a____________________?
a. charge in motion
b. charge at rest
c. both
d. none
Answer- charge in motion
Que- If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
a. τ = NIAB cosφ
b. τ = NIAB sinφ
c. τ = NIAB tanφ
d. τ = NIAB
Answer- τ = NIAB
Que- Magnetic flux and flux density are related by___________________?
a. magnetic flux = flux density / area
b. magnetic flux = flux density x area
c. flux density = magnetic flux area
d. flux density = magnetic flux x area
Answer- magnetic flux = flux density x area
Que- The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?
a. a circle
b. a spiral
c. an ellipse
d. helix
Answer- helix
Que- Value of permeability of free space in SI units is___________________?
a. 4πx10-9 WbA-1m-1
b. 4πx10-7 WbA-1m-1
c. 4πx10-10 WbA-1m-1
d. 4πx10-8 WbA-1m-1
Answer- 4πx10-7 WbA-1m-1
Que- The magnetic field strength of solenoid is__________________?
a. B = μNI
b. B = μN/I
c. B = μnI
d. Both B and C
Answer- Both B and C
Que- The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?
a. 18Ω
b. 30Ω
c. 24Ω
d. 12Ω
Answer- 12Ω
Que- The sensitivity of a galvanometer is given by__________________?
a. C/BAN
b. CAN/B
c. BAN/C
d. ABC/N
Answer- C/BAN
Que- Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
a. 0.1 A
b. 1:00 AM
c. current sensitivity
d. 1 m A
Answer- current sensitivity
Que- While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
a. a most sensitive galvanometer is used
b. a steady voltage cell is used
c. the balance point is close to the middle of the wire
d. a high resistance box is used in one of its gap
Answer- the balance point is close to the middle of the wire
Que- An ammeter measures the total current flowing through a circuit when it is connected__________________?
a. in series with the circuit
b. in parallel with circuit
c. in series with any of the parallel resistances in the circuit
d. in parallel with any of the series resistances in the circuit
Answer- in series with the circuit
Que- The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
a. use a very long and fine suspension
b. use a coil of very large area
c. use a coil with very large number of turns
d. use a very strong magnetic field
Answer- use a very strong magnetic field
Que- When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?
a. a straight line parallel to the field
b. a parabola in a plane perpendicular to the field
c. a circle in a plane perpendicular to the field
d. a straight line along its initial direction
Answer- a circle in a plane perpendicular to the field
Que- Galvanometer is a very sensitive device with______________________?
a. very low damping
b. very high damping
c. no damping at all
d. radial field disintegration
Answer- very low damping
Que- Heating a magnet will ____________________?
a. weaken it
b. strengthen it
c. reverse its polarity
d. demagnetize it completely
Answer- weaken it
Que- A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
a. 4 volt
b. 5 volt
c. 2 volt
d. 0.4 volt
Answer- 2 volt
Que- An alternating current or voltage_____________________?
a. fluctuates off and on
b. varies in magnitude alone
c. changes its direction again and again
d. changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals
Answer- changes its direction again and again
Que- Electromagnetic waves travel in free space with the speed of___________________?
a. λ-rays
b. Positive rays
c. Cathode rays
d. More than sound waves
Answer- λ-rays