Free Printable work , energy power

1.

A car is accelerated on a lavelled road and attains a velocity 4 times of its initial velocity. Inthis process,the potential energy of the car

(a) does not change

(b) becomes twice to that of initial

(c) becomes 4 times that of initial

(d) becomes 16 times that of initial

a)

a

b)

b

c)

c

d)

d

2.

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same

(a) acceleration

(b) momenta

(c) potential energy

(d) kinetic energy

a)

a

b)

b

c)

c

d)

d

3.

When a body falls freely towards the earth, then its total energy

(a) increases

(b) decreases

(c) remains constant

(d) first increases and then decreases

a)

a

b)

b

c)

c

d)

d

4.

In case of negative work, the angle between the force and displacement is

(a) 0

(b) 45°

(c) 90°

(d) 180°

a)

a

b)

b

c)

c

d)

d

5.

Water stored in a dam possesses

(a) no energy

(b) electrical energy

(c) kinetic energy

(d) potential energy

a)

a

b)

b

c)

c

d)

d

6.

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m/s² )

(a) 6 x 10 J

(b) 6 J

(c) 0.6 J

(d) zero

a)

a

b)

b

c)

c

d)

d

7.

The work done on an object does not depend upon the

(a) displacement

(b) force applied

(c) angle between force and displacement

(d) initial velocity of the object

a)

a

b)

b

c)

c

d)

d

8.

The power of a motor pump is 2 kW. How much water per minute, the pump can raise to a height of 10 m? [given, g = 10 m/s² ]

a)

360 kg

b)

1200 kg

c)

330 kg

d)

430kg

9.

Which one of the following is not the unit’ of energy?

(a) Joule

(b) Newton metre

(c) Kilowatt

(d) Kilowatt hour

a)

a

b)

b

c)

c

d)

d

10.

If an electric iron of 1200 W is used for 30 min everyday, find electric energy consumed in the month of April.

a)

4.5 X 10⁶ J

b)

42.5 X 10⁷ J

c)

6.4 X 10⁷ J

d)

5.8 X 10⁶ J

11.

A body is falling from a height h. After it has fallen a height it will possess

(a) only potential energy

(b) only kinetic energy

(c) half potential and half kinetic energy

(d) more kinetic and less potential energy

a)

a

b)

b

c)

c

d)

d

12.

A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?

a)

1 : 9

b)

1 : 3

c)

1 : 4

d)

1 : 1

work , energy power

Total questions: 12

Worksheet time: 9mins

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