# UPSC MCQs Quiz 12: Science (Physics) with answers

1. Parsec is the unit of

1. distance
2. time
3. intensity of light
4. magnetic line

2. Which of the following physical quantities have the same dimensions?

1. Momentum and impulse
2. Force constant and moment of inertia
3. Energy and angular momentum
4. Power and Young’s modulus

3. An athlete diving off high spring board can perform a variety of exercise in the air before entering the water body. Which one of the following parameter will remain constant during the fall?

1. The athlete’s linear momentum
2. The athlete’s angular momentum
3. The athlete’s kinetic energy
4. The athlete’s moment of inertia

4. If an object undergoes a uniform circular motion, then its

1. acceleration remains uniform
2. velocity changes
3. speed changes
4. velocity remains uniform

5. For a body moving with constant speed in a horizontal circle, which of the following remains constant?

1. Velocity
2. Acceleration
3. Centripetal force
4. KE

6. When two bodies stick together after the collision, then the collision is said to be

1. partially elastic
2. perfectly elastic
3. completely inelastic
4. None of the above

7. In an elastic collision,

1. momentum is conserved but energy is not
2. both momentum and energy are conserved
3. energy is conserved but momentum is not
4. neither momentum nor energy is conserved

8. Assertion (A) When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in forward direction.

Reason (R) The frictional force acts only when the bodies are in contact.

1. Both (A) and (R) are correct and (R) is true explanation of (A)
2. Both (A) and (R) are correct but (R) is not true explanation of (A)
3. (A) is correct and (R) is wrong
4. (A) is wrong and (R) is correct

9. A body is dropped from a height of 1000 m. At what height the velocity of the body will be equal to one half the velocity, when it hits the ground?

1. 75 m
2. 65 m
3. 55 m
4. 45 m

10. A particle is executing in SHM. Then the graph of acceleration as a function of displacement is

1. straight line
2. ellipse
3. hyperbola
4. circle

• 1. (a)
• 2. (a)
• 3. (b)
• 4. (b)
• 5. (d)
• 6. (c)
• 7. (b)
• 8. (b)
• 9. (a)
• 10. (b)

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