Page 92 - Science class 4

2. How is wind energy useful?

3. What is the force of friction? How is it useful?

4. How is work defined in science?

5. What type of simple machine would you find in a car? How it works?

B. Answer the following questions briefly :

1. Define energy.

2. What is a wedge? Give a simple example.

3. What is gravity?

One Among All Multiple Choice Questions (MCQs)
One Among All Multiple Choice Questions (MCQs)

Tick ( ) the right option :3

1. What are the sources of energy?

(a) Wind (b) Water (c) Sun (d) All of these

2. Tick ( ) for the forms of energy?ü

(a) Heat, light

(b) Electrical, magnetic and sound energy

(c) Chemical, mechanical

(d) All of these

3. Tick ( ) the correct statement?ü

(a) The main source of energy is the Sun

(b) The Earth is main source of energy

(c) The Moon is main source of energy

(d) None of these

4. Tick ( ) the incorrect statement ?

(a) The Sun is not the source of energy

(b) Machines make our work easy

(c) The force that pulls objects downwards towards

the centre of the Earth is called gravity

(d) None of these