# UPSC MCQs Quiz 6: Science (Physics) with answers

1. A noise level of 100 decibel would correspond to [IAS 2000]

1. just audible sound
2. ordinary conversation
3. sound from a noisy street
4. noise from a machine shop

2. Which of the following statements is false?

1. A body can have zero velocity and still be accelerated
2. A body can have a constant velocity and still have a varying speed
3. A body can have a constant speed and still have varying velocity
4. The direction of the velocity of a body can change when its acceleration is constant

3. A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant?

1. Kinetic energy of the ball
2. Speed of the ball
3. Horizontal component of velocity
4. Vertical component of velocity

4. A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously?

1. They must have the same volume
2. They must have the same density
3. They must have the same mass
4. They must be dropped in vacuum

5. A bullet is fired from a rifle. If the rifle recoil freely, the kinetic energy of the rifle in comparison to that of the bullet is

1. greater
2. equal
3. less
4. Nothing can be said

6. In which case does the potential energy decrease?

1. On compressing a spring.
2. On stretching a spring.
3. On moving a body against gravitational force.

7. When a bicycle is in motion by pedalling, the force of friction exerted by the ground on the two wheels is such that it acts

1. in the backward direction on the front wheel and in the forward direction on the rear wheel
2. in the forward direction on the front wheel and in the backward direction on the rear wheel
3. in the backward direction on both front and the rear wheels
4. in the forward direction on both front and the rear wheels

8. The intensity of earth’s gravitational field is maximum at

1. the equator
2. the pole
3. the centre of the earth
4. None of the above

9. If the distance between two masses is doubled, the gravitational attraction between them

1. is doubled
2. is reduced to half
3. becomes four times
4. is reduced to quarter

10. If a pendulum clock is brought on the moon, then the period of oscillation of the pendulum clock becomes

1. decreased
2. increased
3. zero
4. infinite

• 1. (d)
• 2. (b)
• 3. (c)
• 4. (d)
• 5. (c)
• 6. (a)
• 7. (a)
• 8. (b)
• 9. (b)
• 10. (b)
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## 2 Replies to “UPSC MCQs Quiz 6: Science (Physics) with answers”

1. PrendÃ­ una vela blanca y se consumiÃ³ casi toda, pero un pedacito se denpserdiÃ³ y quedÃ³ en forma de escalera hacia ariba y con un pedazo de mecha. Â¿Me pueden decir quÃ© singnifica? Gracias.

2. Asai says:

question number 9