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- Question
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
- Correct Answer
- necessary centripetal force may be obtained from the horizontal component of the weight of the train
- 1. Pick out the scalar quantity
Options- A. force
- B. pressure
- C. velocity
- D. acceleration Discuss
- 2. Lux is the SI unit of
Options- A. intensity of illumination
- B. luminous efficiency
- C. luminous flux
- D. luminous intensity Discuss
- 3. Optical fibre works on the
Options- A. principle of refraction
- B. total internal reflection
- C. scattering
- D. interference Discuss
- 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
- 5. 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
- 6. 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
- 7. 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
- 8. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
Options- A. 0.14 m/s
- B. 140 m/s
- C. 1.4 km/s
- D. 14 m/s Discuss
- 9. One nanometer is equal to
Options- A. 10-6m
- B. 10-8m
- C. 10-9m
- D. 10-5m Discuss
- 10. Radio telescopes are better than optical telescopes because
Options- A. they can detect faint galaxies which no optical telescope can
- B. they can work even in cloudy conditions
- C. they can work during the day and night
- D. All of the above Discuss
Physics problems
Search Results
Correct Answer: pressure
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.
Correct Answer: total internal reflection
Correct Answer: a good conductor of heat but a bad conductor of electricity
Correct Answer: greater than the speed of sound
Correct Answer: will not rise
Correct Answer: Mirage
Correct Answer: 14 m/s
Correct Answer: 10-9m
Correct Answer: All of the above
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