Physics problems
- 1. Large astronomical telescopes always use as objective
Options- A. lens
- B. mirror
- C. combinations of lenses
- D. None of the above Discuss
Correct Answer: combinations of lenses
- 2. 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 Discuss
Correct Answer: mercury has greater visibility than water
- 3. 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 Discuss
Correct Answer: greater than the speed of sound
- 4. 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 Discuss
Correct Answer: a good conductor of heat but a bad conductor of electricity
- 5. Optical fibre works on the
Options- A. principle of refraction
- B. total internal reflection
- C. scattering
- D. interference Discuss
Correct Answer: total internal reflection
- 6. Lux is the SI unit of
Options- A. intensity of illumination
- B. luminous efficiency
- C. luminous flux
- D. luminous intensity Discuss
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 Discuss
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 Discuss
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 Discuss
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 Discuss
Correct Answer: Mirage
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