Discussion
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- Question
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
- Correct Answer
- All of the above
- 1. One nanometer is equal to
Options- A. 10-6m
- B. 10-8m
- C. 10-9m
- D. 10-5m Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
Options- A. 4.2 seconds
- B. 42 seconds
- C. 4.2 years
- D. 42 years Discuss
- 7. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
- Diffusion
- Refraction
- Internal reflection
Options- A. I, II and III
- B. I and II
- C. II and III
- D. I and III Discuss
- 8. Sound of frequency below 20 Hz is called
Options- A. audio sounds
- B. infrasonic
- C. ultrasonic
- D. supersonics Discuss
- 9. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
Options- A. the heating effect of current alone
- B. hysteresis loss alone
- C. both the heating effect of current and hysteresis loss
- D. intense sunlight at noon Discuss
- 10. Stars appears to move from east to west because
Options- A. all stars move from east to west
- B. the earth rotates from west to east
- C. the earth rotates from east to west
- D. the background of the stars moves from west to east Discuss
Physics problems
Search Results
Correct Answer: 10-9m
Correct Answer: 14 m/s
Correct Answer: Mirage
Correct Answer: will not rise
Correct Answer: necessary centripetal force may be obtained from the horizontal component of the weight of the train
Correct Answer: 4.2 years
Correct Answer: II and III
Correct Answer: infrasonic
Correct Answer: both the heating effect of current and hysteresis loss
Correct Answer: the earth rotates from west to east
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