EASY
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Liquids expand more than solids on heating.

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Important Questions on Changes Around Us

MEDIUM
When water is cooled, its particles start moving faster.
MEDIUM
Why does heating lead to expansion of matter?
EASY
Which of the following is not an effect of heating a substance?
EASY
What happens to a metal when it is cooled?
MEDIUM
Why are gaps left between rails on a railway track?
EASY
Among the following, maximum expansion on heating will be shown by
MEDIUM
When a substance is cooled, the movement of its particles.
MEDIUM
What is the increase in the volume of a substance called?
MEDIUM
Write and explain two examples where the expansion of solids is applied. 
HARD
Give two applications of expansion and contraction of materials.
EASY
On heating the volume/size of most substances _____(increases/decreases).
MEDIUM
Why can a tight metallic lid on a glass bottle be opened easily if immersed in hot water for some time?
MEDIUM
How is a metal rim fixed tightly over a wooden wheel?
MEDIUM
The decrease in the size of matter on cooling is called.
EASY
What is the effect of cooling on metals?
MEDIUM

Differentiate between the following:

Expansion and contraction.

HARD

Look at the given set-up and describe what is being shown.

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HARD

Look at the given set-up and describe what is being shown.

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EASY
Can the changes that a metal undergoes during heating and cooling be reversed?
HARD
Why is a mercury thermometer used to measure temperature?