Physics problems
- 1. Natural radioactivity was discovered by
Options- A. Marie Curie
- B. Ernest Rutherfor
- C. Henri Becquerel
- D. Enrico Fermi Discuss
Correct Answer: Henri Becquerel
- 2. 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 Discuss
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
- 3. Pa(Pascal) is the unit for
Options- A. thrust
- B. pressure
- C. frequency
- D. conductivity Discuss
Correct Answer: pressure
- 4. 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
Correct Answer: visible light
- 5. Minimum number of unequal vectors which can give zero resultant are
Options- A. two
- B. three
- C. four
- D. more than four Discuss
Correct Answer: three
- 6. Moment of inertia is
Options- A. vector
- B. scalar
- C. phasor
- D. tensor Discuss
Correct Answer: tensor
- 7. Sound travels at the fastest speed in
Options- A. steel
- B. water
- C. air
- D. vacuum Discuss
Correct Answer: steel
- 8. Planets do not twinkle because
Options- A. they emit light of a constant intensity
- B. their distance from the earth does not change with time
- C. they are very far away from the earth resulting in decrease in intensity of light
- D. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable Discuss
Correct Answer: they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
- 9. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
Options- A. mercury is a metal
- B. density of mercury is greater than that of water
- C. cohesion of mercury is greater than its adhesion with glass
- D. cohesion of water is greater than its adhesion with glass Discuss
Correct Answer: cohesion of mercury is greater than its adhesion with glass
- 10. The working principle of a washing machine is
Options- A. reverse osmosis
- B. diffusion
- C. centrifugation
- D. dialysis Also asked in: GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst
Correct Answer: centrifugation
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