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- Question
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
- Correct Answer
- II and III
- 1. 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
- 2. 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
- 3. One nanometer is equal to
Options- A. 10-6m
- B. 10-8m
- C. 10-9m
- D. 10-5m Discuss
- 4. 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
- 5. 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
- 6. Sound of frequency below 20 Hz is called
Options- A. audio sounds
- B. infrasonic
- C. ultrasonic
- D. supersonics Discuss
- 7. 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
- 8. 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
- 9. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
Options- A. 1200 m
- B. 0.33 km
- C. 3.33 km
- D. 33 km Discuss
- 10. Radiocarbon is produced in the atmosphere as a result of
Options- A. collision between fast neutrons and nitrogen nuclei present in the atmosphere
- B. action of ultraviolet light from the sun on atmospheric oxygen
- C. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- D. lightning discharge in atmosphere Discuss
Physics problems
Search Results
Correct Answer: 4.2 years
Correct Answer: All of the above
Correct Answer: 10-9m
Correct Answer: 14 m/s
Correct Answer: Mirage
Correct Answer: infrasonic
Correct Answer: both the heating effect of current and hysteresis loss
Correct Answer: the earth rotates from west to east
Correct Answer: 3.33 km
Correct Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere
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