Page 75 - Science class 4

Substituting Yourself
Substituting Yourself

Give one word for each one of the following :

1. Adding chlorine to kill germs _______________

2. The state of air, clouds, rain and the Sun _______________
3. The moving air _______________

Brush Up Your Learning
Brush Up Your Learning

A. Answer the following questions :

1. How are days and nights formed?
2. What makes a change of season?

3. How does the Sun effect the movement of air?
4. What is evaporation?

5. Which is the purest form of drinking water? Do we use it for drinking?

Why?

B. Answer the following questions briefly :

1. How can we make water the purest liquid?

2. What is the direction of sea breeze?

3. Which is the better method for purifying water — decantation or filtration?

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

Tick ( ) the right option : 3

1. The moving of the Earth around its axis is called _______________ .

(a) rotation (b) revolving

(c) circling (d) none of these

2. The moving of the Earth around the Sun is called _______________.

(a) resolution (b) revolution

(c) evolution (d) none of these

3. Air is a combination of ___________, dust and water vapours.

(a) ice (b) water

(c) gases (d) none of these