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- Question
Stars twinkle because
Options- A. the intensity of light emitted by them changes with time
- B. the distance of the stars from the earth changes with time
- C. the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
- D. the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
- Correct Answer
- the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
- 1. Natural radioactivity was discovered by
Options- A. Marie Curie
- B. Ernest Rutherfor
- C. Henri Becquerel
- D. Enrico Fermi Discuss
- 2. One should not connect a number of electrical appliances to the same power socket because
Options- A. this can damage the appliances due to overloading
- B. this can damage the domestic wiring due to overloading
- C. this can damage the electrical meter
- D. the appliance will not get full voltage Discuss
- 3. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
Options- A. east
- B. west
- C. northeast
- D. southeast Discuss
- 4. It is easier to roll a stone up a sloping road than to lift it vertical upwards because
Options- A. work done in rolling is more than in lifting
- B. work done in lifting the stone is equal to rolling it
- C. work done in both is same but the rate of doing work is less in rolling
- D. work done in rolling a stone is less than in lifting it Discuss
- 5. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Options- A. move towards A
- B. move towards B
- C. move at right angles to the line joining A and B
- D. remain at rest Discuss
- 6. Pa(Pascal) is the unit for
Options- A. thrust
- B. pressure
- C. frequency
- D. conductivity Discuss
- 7. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Options- A. X-rays
- B. ultraviolet light
- C. visible light
- D. radio waves Discuss
- 8. Minimum number of unequal vectors which can give zero resultant are
Options- A. two
- B. three
- C. four
- D. more than four Discuss
- 9. Moment of inertia is
Options- A. vector
- B. scalar
- C. phasor
- D. tensor Discuss
- 10. Sound travels at the fastest speed in
Options- A. steel
- B. water
- C. air
- D. vacuum Discuss
Physics problems
Search Results
Correct Answer: Henri Becquerel
Correct Answer: this can damage the domestic wiring due to overloading
Correct Answer: east
Correct Answer: work done in rolling a stone is less than in lifting it
Correct Answer: move towards B
Correct Answer: pressure
Correct Answer: visible light
Correct Answer: three
Correct Answer: tensor
Correct Answer: steel
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