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Physics
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Question
Optical fibre works on the
Options
A. principle of refraction
B. total internal reflection
C. scattering
D. interference
Correct Answer
total internal reflection
Physics problems
Search Results
1. Mica is used in electrical appliances such as electric iron because mica is
Options
A. a good conductor of heat but a bad conductor of electricity
B. a bad conductor of heat but a good conductor of electricity
C. a good conductor of heat as well as electricity
D. a bad conductor of heat as well as electricity
Show Answer
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Correct Answer: a good conductor of heat but a bad conductor of electricity
2. Supersonic plane fly with the speed
Options
A. less than the speed of sound
B. of sound
C. greater than the speed of sound
D. of light
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Correct Answer: greater than the speed of sound
3. Mercury is commonly used as a thermometric fluid rather than water because
Options
A. specific heat of mercury is less than water
B. specific heat of mercury is more than water
C. mercury has greater visibility than water
D. density of mercury is more than the water
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Correct Answer: mercury has greater visibility than water
4. Large astronomical telescopes always use as objective
Options
A. lens
B. mirror
C. combinations of lenses
D. None of the above
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Correct Answer: combinations of lenses
5. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Options
A. Pressure and Young's modules
B. Planck's constant and Angular momentum
C. Impulse and moment of force
D. Force and rate of change of linear momentum
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Correct Answer: Impulse and moment of force
6. Lux is the SI unit of
Options
A. intensity of illumination
B. luminous efficiency
C. luminous flux
D. luminous intensity
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Correct Answer: intensity of illumination
Explanation:
The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.
7. Pick out the scalar quantity
Options
A. force
B. pressure
C. velocity
D. acceleration
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Correct Answer: pressure
8. Railway tracks are banked on curves
Options
A. necessary centrifugal force may be obtained from the horizontal component weight of the train
B. to avoid frictional force between the tracks and wheels
C. necessary centripetal force may be obtained from the horizontal component of the weight of the train
D. the train may not fly off in the opposite direction
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Correct Answer: necessary centripetal force may be obtained from the horizontal component of the weight of the train
9. Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
Options
A. will overflow
B. will not rise
C. depressed
D. change its meniscus
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Correct Answer: will not rise
10. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Options
A. Rainbow
B. Earthshine
C. Halo
D. Mirage
Show Answer
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Correct Answer: Mirage
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