Free Printable class 7

1.

A man weighs 600 N. He runs up stairs of total height 4 metres in 3 seconds.

How much power is exerted by the man

a)

450W

b)

800W

c)

2400W

d)

7200W

2.

Which energy changes take place when a pedalling cyclist uses a generator (dynamo) to light his bicycle lamp?

a)

chemical → kinetic → electrical → light

b)

electrical → chemical → kinetic → light

c)

kinetic → chemical → light → electrical

d)

light → electrical → kinetic → chemical

3.

A boy, who weighs 50 N, runs up a flight of stairs 6.5m high in 7 seconds.How much power does he develop?

a)

$\frac{6.5}{50\times7}$ W

b)

$\frac{7\times6.5}{50}$ W

c)

$\frac{50}{6.5\times7}$ W

d)

$\frac{50\times6.5}{7}$ W

4.

A student who weighs 500 N climbs up a flight of stairs 10 metres high in 5 seconds. What power does she develop?

a)

$500\times10\times5$ W

b)

$\frac{500\times10}{5}$ W

c)

$\frac{500\times5}{10}$ W

d)

$\frac{5}{500\times10}$ W

5.

A rock of mass 20 kg is travelling in space at a speed of 6m/ s. What is its kinetic energy?

a)

60J

b)

120J

c)

360J

d)

720J

6.

The diagram shows a curved curtain rail that has a steel ball rolling on it. The ball is released at point A. At which point does the ball have maximum kinetic energy?

a)

A

b)

B

c)

C

d)

D

7.

A 2 kg mass is moving at constant speed.The kinetic energy of the mass is 400 J. What is the speed of the mass?

a)

0.4 m/s

b)

20 m/s

c)

200 m/s

d)

400 m/s

8.

A man carrying a load of 6 kg runs upstairs. If the work that the man does on the load is 300 J. Find height of the stairs.

a)

5 m

b)

50 m

c)

180 m

d)

1800m

9.

The work done on an object raised 6 m is 1200 J. Find the mass of this object.

a)

200 kg

b)

20 kg

c)

1800 kg

d)

2000 kg

10.

1. What is the mass of a boy who runs at a speed of 4 m/s, if its kinetic energy is 400J

a)

50 kg

b)

60 kg

c)

100kg

d)

25 kg

11.

1. Which one of the following SI unit of energy?

a)

joules/ second

b)

newton

c)

joule

d)

watt

12.

1. Which one of the following SI unit of power?

a)

second

b)

newton

c)

joules

d)

watt

13.

Energy can be defined a the ...........to do work

a)

work

b)

energy

c)

ability

d)

power

14.

...............energy is the energy of an object due to its position

a)

kinetic

b)

thermal

c)

potential

d)

chemical

15.

............is the energy of a stretched or squashed object

a)

heat energy

b)

elastic energy

c)

light energy

d)

sound energy

16.

.........is the energy coming from a vibrating source

a)

heat

b)

light

c)

sound

d)

kinetic

17.

............. is the energy due to motion

a)

heat

b)

gravitational

c)

kinetic

18.

The energy spreading out from a bright object

a)

light

b)

chemical

c)

thermal

d)

kinetic

19.

the base unit of time is ......

a)

second

b)

minute

c)

hour

d)

day

20.

Symbol of power is

a)

W

b)

P

c)

E

d)

t

21.

Work depends on distance and...

a)

energy

b)

time

c)

power

d)

force

22.

unit of force is

a)

joules

b)

newton

c)

second

d)

watt

class 7

Total questions: 22

Worksheet time: 29mins

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