EASY
7th ICSE
IMPORTANT
Earn 100

What do you understand by thermal expansion of a substance ?

Important Questions on Heat

EASY
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 17
Name two substances which expand on heating.
MEDIUM
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 18
Why do telephone wires sag in summer ?
EASY
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 19
Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.
MEDIUM
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 20
Why are gaps left between successive rails on a railway track ?
MEDIUM
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 21
A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why ?
MEDIUM
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 22
Why is a cement floor laid in small pieces with gaps in between?
MEDIUM
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 23
One end of a steel girder in a bridge is not fixed, but is kept on rollers. Give the reason.
HARD
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 5 - Heat>TEST YOURSELF>Q 24
Describe one experiment to show that liquids expand on heating.