Science in Everyday Life — Practice

Question 1

Give one example of a reversible change.

Accepted Answer

Melting ice into water, which can be frozen back into ice.

Question 2

What is another name for irreversible changes?

Accepted Answer

Permanent changes.

Question 3

Who is known as the Missile Man of India?

Accepted Answer

Dr. A.P.J. Abdul Kalam.

Question 4

The blue appearance of the sky is due to which property of light?

Accepted Answer

Scattering.

Question 5

Circle the odd one and explain: melting, freezing, boiling, cooking.

Accepted Answer

Cooking, because it is an irreversible change while melting, freezing and boiling are all reversible.

Question 6

Circle the odd one and explain: boiling, burning, cooking, rusting of iron.

Accepted Answer

Boiling, because it is reversible while burning, cooking and rusting are all irreversible.

Question 7

Where and when was Dr. A.P.J. Abdul Kalam born, and from which college did he take his B.Sc.?

Accepted Answer

He was born on 15 October 1931 in Rameswaram, Tamil Nadu, and took his B.Sc. from St. Joseph's College, Tiruchirappalli, in 1954.

Question 8

What is waste, and name four waste items commonly found in a school.

Accepted Answer

Any substance discarded after primary use, being unwanted and of no further value. School waste includes papers, pen parts, blades and chocolate wrappers.

Question 9

Explain why the sky appears blue, and name the scientist whose work explains it.

Accepted Answer

Sunlight is a mixture of colours. As it passes through the atmosphere, the tiny particles of air scatter blue light far more than the other colours, and that scattered blue reaches our eyes from all over the sky. Sir C.V. Raman worked on the scattering of light.

Question 10

How would you decide whether a change is reversible or irreversible? Test your rule on burning paper.

Accepted Answer

Ask whether the original substance can be got back. Burnt paper turns into ash, and the ash can never become paper again, so burning is irreversible.

Question 11

Give three reasons why waste needs a proper management system.

Accepted Answer

To control water, air and soil pollution; to protect health, since rotting waste breeds flies, mosquitoes and rats that spread disease; and to recover useful materials such as paper, glass and metal for recycling rather than burying them.

Practice — Science in Everyday Life

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