Free Printable Grade 9 Revision

1.

Which of the following statements is correct regarding the relation between centripetal force and radius of the circular path?

a)

a) The work done by the centripetal force increases if the radius of the path is increased

b)

b) The work done by the centripetal force decreases by decreasing the radius

c)

c) The work done by the centripetal force increases by decreasing the radius

d)

d) The work done is always zero.

2.

A man carrying a bucket of water and walking on a rough level road with a uniform velocity does no work while carrying the bucket. Which of the following statements gives the correct reason for this?

a)

(a) The displacement of the bucket is zero.

b)

(b) There is no force acting on the bucket.

c)

(c) The displacement of the bucket is in the direction of force applied

d)

(d) There is no displacement in the direction of the force applied.

3.

When a force retards the motion of a body, the work done is

a)

(a) positive

b)

b) zero

c)

(c) negative

d)

(d) undefined

4.

Which of the following is not an example of potential energy?

a)

A dog chasing a hare.

b)

Water stored in a dam.

c)

A stretched bow and arrow system.

d)

A stone lying on the top of a roof

5.

The unit of work is joule. The other physical quantity that has same unit is

a)

(a) power

b)

(b) velocity

c)

(c) energy

d)

(d) force

6.

If force and displacement of the particle (in direction of force) are doubled, work will be

a)

(a) doubled

b)

(b) increased 4 times

c)

(c) halved

d)

(d) 1/4 times

7.

A ball is thrown upward from a point P, reaches the highest point Q.

a)

(a) kinetic energy at P is equal to kinetic energy at Q

b)

(b) potential energy at P is equal to kinetic energy at Q

c)

(c) kinetic energy at P is equal to potential energy at Q

d)

(d) potential energy at P is equal to potential energy at Q

8.

A cricket ball is projected vertically upward such that it returns back to the thrower. The variation in kinetic energy with time is best represented by

a)

b)

c)

d)

9.

Watt second represents the unit of

a)

(a) energy

b)

(b) power

c)

(c) force

d)

d) efficiency of engine

10.

In spaceship moving in space, person experience weightlessness as the value of

a)

(a) mass is zero

b)

(b) acceleration due to gravity is zero

c)

(c) gravitational force is zero

d)

(d) none of these

11.

When you put an object on a spring balance, what do you measure?

a)

(a) Weight

b)

(b) Force

c)

(c) Mass

d)

(d) Acceleration

12.

A particle is thrown up with a velocity of 50 m/s. What will its velocity be at the highest point? ( assume g = 10 m/s^2)

a)

500 m/s

b)

5 m/s

c)

0.5 m/s

d)

0

13.

A particle is thrown up with a velocity of 50 m/s. What will be the time taken to reach the highest point? ( assume g = 10 m/s^2)

a)

50 s

b)

5 s

c)

10 s

d)

0.5 s

14.

An object weighs 49 N. What is its mass?

a)

49 N

b)

5 N

c)

5 kg

d)

49 Kg

Grade 9 Revision

Total questions: 14

Worksheet time: 8mins

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