HARD
6th CBSE
IMPORTANT
Earn 100

What is the effect of heating and cooling on some materials?

Important Questions on Changes Around Us

MEDIUM
6th CBSE
IMPORTANT
Explain why melting of butter is reversible, whereas curdling of milk is irreversible.
HARD
6th CBSE
IMPORTANT
Explain why tearing of paper is a physical change, whereas burning of paper is a chemical change.
MEDIUM
6th CBSE
IMPORTANT
Give an example of expansion each in solid, liquid, and gas.
MEDIUM
6th CBSE
IMPORTANT
Give an example of contraction each in solid, liquid, and gas.
HARD
6th CBSE
IMPORTANT
Give three applications of expansion and contraction of materials.
MEDIUM
6th CBSE
IMPORTANT

Recall and complete the concept map given below.

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MEDIUM
6th CBSE
IMPORTANT
Why do water pipes usually crack in winter?
MEDIUM
6th CBSE
IMPORTANT
A potter gives clay the shape of pots. He bakes these pots in an oven. Can the potter get back the raw clay? Give reasons for your answer.