Que- Newton estimated the speed of sound _____________________?
a. 281m/sec
b. 333m/sec
c. 340m/sec
d. all of the above
Answer- 281m/sec
Que- The speed of sound in hydrogen is _____________ time than that in oxygen?
a. Two times
b. Three times
c. Four time
d. Six time
Answer- Four time
Que- The speed of stationary waves in a stretched string are independent of___________________?
a. Number of loops
b. Tension in the string
c. Point where string is plucked
d. both A and C
Answer- both A and C
Que- Which phenomena can be applied to estimate the velocity of star with respect to earth ___________________?
a. Dopplers effect
b. Interference of waves
c. Beats phenomena
d. All of these
Answer- Dopplers effect
Que- The waves that require a material medium for their propagation are called__________________?
a. matter waves
b. electromagnetic waves
c. carrier waves
d. mechanical waves
Answer- mechanical waves
Que- When two identical traveling waves are superimposed, the velocity of the resultant wave__________________?
a. decreases
b. increases
c. remains unchanged
d. becomes zero
Answer- remains unchanged
Que- If stretching force T of wire increases, then its frequency __________________?
a. decreases
b. increases
c. remains the same
d. any of above
Answer- increases
Que- It is possible to distinguish between transverse and longitudinal waves form the property of __________________?
a. refraction
b. polarization
c. interference
d. diffraction
Answer- polarization
Que- Sound waves do not travel in vacuum because ___________________?
a. they are transverse waves
b. they are stationary waves
c. they require material medium for propagation
d. they do not have enough energy
Answer- they require material medium for propagation
Que- Increase in velocity of sound in the air for 1°C rise in temperature is_________________?
a. 1.61 ms-1
b. 61.0 ms-1
c. 0.61 ms-1
d. 2.00 ms-1
Answer- 0.61 ms-1
Que- On loading the prong of a tuning form with wax its frequency____________________?
a. increases
b. decreases
c. remains unchanged
d. may increase or decrease
Answer- decreases
Que- The normal ear is the most sensitive in the frequency range___________________?
a. 20000 to 30000 hertz
b. 10 to 20 hertz
c. 2000 to 4000 hertz
d. 6000 to 8000 hertz
Answer- 2000 to 4000 hertz
Que- The velocity of sound in air would become double than its velocity at 0°C at temperature________________?
a. 313°C
b. 586°C
c. 819°C
d. 1172°C
Answer- 819°C
Que- The periodic alternation of sound between maximum and minimum loudness are called___________________?
a. silence zone
b. interference
c. beats
d. resonance
Answer- beats
Que- Beats are the results of____________________?
a. diffraction of sound waves
b. constructive and destructive interference
c. polarization
d. destructive interference
Answer- constructive and destructive interference
Que- Doppler effect applies to____________________?
a. sound wave only
b. light wave only
c. both sound and light waves
d. neither sound nor light wave
Answer- both sound and light waves
Que- A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ?
a. 1/4f
b. 1/2f
c. frequency lower than 20 Hz
d. 2f
Answer- frequency lower than 20 Hz
Que- In open organ pipe___________________?
a. only even harmonics are present
b. only odd harmonics are present
c. both even and odd harmonics are present
d. selected harmonics are present
Answer- both even and odd harmonics are present
Que- The dimension of elastic modulus is ___________________ ?
a. ML-1T-2
b. ML-2T-2
c. MLT-2
d. ML2T-2
Answer- ML-1T-2
Que- Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________?
a. Longitudinal
b. Transverse
c. Periodic
d. both A and C
Answer- both A and C
Que- Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?
a. isothermal law
b. adiabatic law
c. isochoric law
d. all of the above
Answer- adiabatic law
Que- The beats frequency (sensible) for a human car is _____________________?
a. 42Hz
b. 7 Hz
c. 256Hz
d. 262Hz
Answer- 7 Hz
Que- Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?
a. One
b. Two
c. Four time
d. None of these
Answer- Two
Que- The current through a metallic conductor is due to the motion of _________________?
a. free electrons
b. protons
c. neutrons
d. still under controversy
Answer- free electrons
Que- A wire having very high value of conductance is said to be____________________?
a. very good conductor
b. moderately good conductor
c. an insulator
d. no specific criterion available
Answer- very good conductor
Que- Production of heat due to an electric current flowing through a conductor is given by _________________?
a. Joule effect
b. Joule Thomsons effect
c. Comptons effect
d. Feed back effect
Answer- Joule effect
Que- Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?
a. 40 W
b. 90W
c. 100W
d. 120W
Answer- 90W
Que- Thermocouples convert___________________?
a. heat energy into electrical energy
b. heat energy into light energy
c. heat energy into mechanical energy
d. mechanical energy into heat energy
Answer- heat energy into electrical energy
Que- An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________?
a. 2KWh
b. 20KWh
c. 6KWh
d. 12KWh
Answer- 2KWh
Que- Resistance of an ideal insulator is __________________?
a. infinite
b. zero
c. finite
d. depends upon nature
Answer- infinite
Que- Reciprocal of resistivity is called__________________?
a. resistance
b. inductance
c. conductivity
d. flexibility
Answer- conductivity
Que- Circuit which gives continuously varying potential is called _______________________?
a. complex network
b. wheat stone bridge
c. potential divider
d. all of above
Answer- potential divider
Que- There are three bulbs of 60W 100W and 200W which bulb has thickest filament ?
a. 100W
b. 200W
c. 60W
d. all
Answer- 200W
Que- Specific resistance of a wire____________________?
a. will depend on its length
b. will depend on its radius
c. will depend on the type of material of the wire
d. will depend on none of the above
Answer- will depend on the type of material of the wire
Que- In the following figure, the terminal potential is ___________________ ?
a. zero
b. 2V
c. 12V
d. 36V
Answer- zero
Que- Which one of the following materials is useful for making bulb filaments ?
a. constantan
b. nichrome
c. copper
d. tungsten
Answer- tungsten
Que- If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be_______________?
a. 3600C
b. 7200C
c. 1C
d. 2C
Answer- 3600C
Que- Why should a resistance be introduced in a circuit in series deliberately ?
a. to increase current
b. to decrease current
c. to control current
d. just to give a good look to circuit
Answer- to decrease current
Que- All electrical appliances are connected in parallel to each other between the main line and neutral wire to get ______________________?
a. same current
b. same current and potential difference
c. different current but same potential difference
d. different current and potential differences
Answer- different current but same potential difference
Que- Resistance of a conductor depends upon_________________?
a. nature of conductor
b. dimension of conductor
c. physical state of the conductor
d. all of above
Answer- all of above
Que- A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________?
a. remains the same
b. is doubled
c. is halved
d. becomes zero
Answer- remains the same
Que- When same current passes for same time through a thick and thin wire_________________?
a. more heat is produced in thick wire
b. more heat is produced in thin wire
c. no heat is produced in wire
d. less heat is produced in thick wire
Answer- more heat is produced in thin wire
Que- One kilowatt hour is the amount of energy delivered during _______________?
a. one second
b. one day
c. one minute
d. one hour
Answer- one hour
Que- How much heat does a 40 W bulb generates in one hour ?
a. 144000J
b. 144J
c. 1.44J
d. 14J
Answer- 144000J
Que- Resistance of a super conductor is ______________________?
a. finite
b. infinite
c. zero
d. changes with every conductor
Answer- zero
Que- Which one is the best material for making connecting wires ?
a. iron
b. tungsten
c. silver
d. copper
Answer- copper
Que- Internal resistance is the resistance offered by________________?
a. source of EMF
b. conductor
c. resistor
d. capacitor
Answer- source of EMF
Que- Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?
a. 40 W bulb
b. 60 W blub
c. 100 W blub
d. all will burn equally brightly
Answer- 40 W bulb
Que- Resistance of a wire on increasing its temperature will_________________?
a. increase with rise in temperature
b. decrease with rise in temperature
c. will remain same
d. depends upon altitude of experimentation
Answer- increase with rise in temperature
Que- An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be______________?
a. 12
b. 24
c. 5
d. 1100
Answer- 12
Que- In liquids and gases the current is due to the motion________________?
a. negative charges
b. positive charges
c. both negative and positive charges
d. neutral particles
Answer- both negative and positive charges
Que- The graphical representation of Ohms law is___________________?
a. hyperbola
b. ellipse
c. parabola
d. straight line
Answer- straight line
Que- The resistance of a conductor at absolute zero (OK) is________________?
a. zero almost
b. infinite almost
c. no prediction at all
d. may increase or decrease
Answer- zero almost
Que- Electrical energy is measured in___________________?
a. watt
b. horse power
c. kilo watt
d. kilowatt hour
Answer- kilowatt hour
Que- Electrical energy is converted to heat at the rate of___________________?
a. IRt
b. I2R
c. I2Rt
d. VIt
Answer- I2R
Que- A fuse is placed in series with the circuit to protect against__________________?
a. high power
b. high voltage
c. high current
d. over heating
Answer- over heating
Que- Which one of the following bulbs has the least resistance ?
a. 100 watt
b. 200 watt
c. 300 watt
d. 60 watt
Answer- 300 watt
Que- Optical active crystals rotates the __________________?
a. vibrating plane
b. polarization plane
c. diffraction plane
d. interference plane
Answer- polarization plane
Que- In double slit experiment we observe _____________________?
a. interference fringes only
b. diffraction fringes only
c. both interference and diffraction fringes
d. polirized frringes
Answer- both interference and diffraction fringes
Que- Which one of the following properties of light does not change with the nature of the medium ?
a. velocity
b. wavelength
c. amplitude
d. frequency
Answer- frequency
Que- Photoelectric effect was given by ____________________?
a. Hertz
b. Fresnel
c. Einstein
d. Plank
Answer- Einstein
Que- Longitudinal waves do not exhibit _____________________?
a. reflection
b. refraction
c. diffraction
d. polarization
Answer- polarization
Que- A point source of light placed in a homogeneous medium gives rise to ___________________?
a. a cylindrical wave front
b. an elliptical wave front
c. a spherical wave front
d. a plane wave front
Answer- a spherical wave front
Que- Which one of the following is nearly monochromatic light ?
a. light form fluorescent tube
b. light form neon lamp
c. light form sodium lamp
d. light form simple lamp
Answer- light form sodium lamp
Que- When crest of one wave falls over the trough of the other wave this phenomenon is known as________________?
a. polarization
b. constructive interference
c. destructive interference
d. diffraction
Answer- destructive interference
Que- In Young double slit experiment, if white light is used____________________?
a. alternate dark and bright fringes will be seen
b. coloured fringes will be seen
c. no interference fringes will be seen
d. impossible to predict
Answer- coloured fringes will be seen
Que- In an interference pattern______________________?
a. bright fringes are wider than dark fringes
b. dark fringes are wider than bright fringe
c. both dark and bright fringes are of equal width
d. central fringes are brighter than the outer fringes
Answer- both dark and bright fringes are of equal width
Que- The blue colour of the sky is due to___________________?
a. diffraction
b. reflection
c. polarization
d. scattering
Answer- scattering
Que- When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?
a. 5000 nm
b. 5000A
c. 500m
d. 2000um
Answer- 5000A
Que- Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?
a. 4 x 10-10 m
b. 2 x 10-10 m
c. 0.02×10-10m
d. 20×10-10m
Answer- 2 x 10-10 m
Que- In a plane polarized light _________________?
a. vibration in all direction
b. vibration in two mutually perpendicular directions
c. vibration take place in a direction perpendicular to the direction of propagation of light
d. no vibration at all
Answer- vibration take place in a direction perpendicular to the direction of propagation of light
Que- Which one of the following cannot be polarized ?
a. radio waves
b. ultraviolot rays
c. X-rays
d. sound waves
Answer- sound waves
Que- In monochromatic red light a blue book will probably appear to be_________________?
a. black
b. purple
c. green
d. no scientific reasoning available
Answer- black
Que- In double slit experiment if one of the two slit is covered then________________?
a. no interference fringes are observed
b. no diffraction fringes are observed
c. no fringes observed
d. interference pattern not disturbed
Answer- no interference fringes are observed
Que- In the shadow of a ball the central portion appears bright that happens due to_________________?
a. Interference
b. Diffraction
c. Polarization
d. Refraction
Answer- Diffraction
Que- Crystals of a material can behave as_________________?
a. Convex lens
b. Interferometer
c. Diffraction grating
d. Concave
Answer- Diffraction grating
Que- Which is not optically active ?
a. sugar
b. tartaric acid
c. water
d. sodium chlorate
Answer- water
Que- When light incident normally on thin film the path difference depends upon ________________?
a. thickness of the film only
b. nature of the film only
c. angle of indidence only
d. all thickness nature and angle of incidence
Answer- all thickness nature and angle of incidence
Que- Light reaches the earth form sun in nearly____________________?
a. 15 minutes
b. 10 minutes
c. 8 minutes
d. 8 minutes 30 seconds
Answer- 8 minutes 30 seconds
Que- According to Einstein light travels form one place to another in the form of ________________?
a. waves
b. particles
c. photons
d. it was not his discovery
Answer- photons
Que- Central spot of Newtons rings __________________?
a. bright
b. dark for large wavelength
c. dark
d. bright for large wavelength
Answer- bright
Que- The locus of all points in a medium having the same phase of vibration is called____________________?
a. crest
b. trough
c. wavelength
d. wave front
Answer- wave front
Que- Two sources of light are coherent if they emit rays of_______________?
a. same wavelength
b. same amplitude of vibration
c. same wave length with constant phase difference
d. same amplitude and wavelength
Answer- same wave length with constant phase difference
Que- The velocity of light was determined accurately by_______________?
a. Newton
b. Michelson
c. Huygen
d. Young
Answer- Michelson
Que- appearance of colour in thin films is due to ____________________?
a. diffraction
b. dispersion
c. interference
d. polarization
Answer- interference
Que- A light ray traveling form rarer to denser medium suffers a phase change of__________________?
a. 60°
b. 90°
c. 180°
d. 45°
Answer- 180°
Que- Diffraction effect is____________________?
a. more for a round edge
b. less for a round edge
c. more for a sharp edge
d. less for a sharp edge
Answer- more for a sharp edge
Que- A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
a. 500 mm
b. 5 x 10-3 mm
c. 2 x 10-5 mm
d. 2 x 10-3 mm
Answer- 2 x 10-3 mm
Que- Light on passing through a Polaroid is ___________________?
a. plane polarized
b. un-polarized
c. circularly polarized
d. elliptically polarized
Answer- plane polarized
Que- Diffraction fringes are____________________?
a. equally spaced
b. distance between them increases
c. distance between then decreases
d. they are adjacent with no space in between
Answer- distance between then decreases
Que- A thing that emits its own light is___________________?
a. luminous
b. non-luminous
c. incandescent
d. bright
Answer- luminous
Que- Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
a. Newton
b. Einstein
c. Michelson
d. Galileo
Answer- Michelson
Que- Which experiment shows that wavelength of light is smaller than that of sound___________________?
a. Diffraction
b. Polarization
c. Interference
d. Reflection
Answer- Diffraction
Que- When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
a. zero
b. minimum
c. infinity
d. maximum
Answer- maximum
Que- If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
a. 38.2 J
b. 392.1 J
c. 39.2 J
d. 3.92 J
Answer- 39.2 J
Que- The average power and instantaneous power become equal if work is done at __________________?
a. any rate
b. at variable rate
c. at uniform rate
d. at high rate
Answer- at uniform rate
Que- Proton electron neutron and a particles have same momentum. Which of them have highest K.E ?
a. Proton
b. electron
c. neutron
d. a-particle
Answer- electron
Que- Work done by variable force is determine by dividing____________________?
a. force into small interval
b. displacement into small interval
c. both force and displacement into small intervals
d. force into small and displacement into large intervals
Answer- displacement into small interval
Que- The escape velocity of a body in gravitational field of earth is independent of__________________?
a. its mass
b. the angle at which it is thrown
c. both its mass and the angle at which it is thrown
d. gravitational field of earth
Answer- both its mass and the angle at which it is thrown
Que- The source of geothermal energy is___________________?
a. decay of radioactive element in the earth
b. compression of material in the earth
c. residual lost of the earth
d. all as said in A – B and C
Answer- all as said in A – B and C