EASY
Earn 100

Do liquids expand or contract when frozen?

Important Questions on Heat

EASY
Science>Physics>Heat>Thermal Expansion
Which quantities remain fixed in the definition of volume expansion co-efficient of a gas? Name a non-metal, which is a good conductor of heat. 
MEDIUM
Science>Physics>Heat>Thermal Expansion
Why is a cement floor laid in small pieces with gaps in between?
EASY
Science>Physics>Heat>Thermal Expansion
The type of thermal expansion that takes place in gases is
MEDIUM
Science>Physics>Heat>Thermal Expansion
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
MEDIUM
Science>Physics>Heat>Thermal Expansion

What does a bimetallic strip consist of?

MEDIUM
Science>Physics>Heat>Thermal Expansion
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 ?
HARD
Science>Physics>Heat>Thermal Expansion

Soft drink bottles are not filled completely. Why?

EASY
Science>Physics>Heat>Thermal Expansion
Name a liquid which is a good conductor of heat.
MEDIUM
Science>Physics>Heat>Thermal Expansion
Describe an experiment to show that air expands on heating.
MEDIUM
Science>Physics>Heat>Thermal Expansion
Why do telephone wires sag in summer ?
HARD
Science>Physics>Heat>Thermal Expansion
Describe one experiment to show that liquids expand on heating.
HARD
Science>Physics>Heat>Thermal Expansion
Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
EASY
Science>Physics>Heat>Thermal Expansion
State one application of thermal expansion of liquids.
HARD
Science>Physics>Heat>Thermal Expansion
Give reasons for: Small gaps are left between successive rail tracks.
EASY
Science>Physics>Heat>Thermal Expansion
State which expands more, when heated to the same temperature: solid, liquid or gas?
EASY
Science>Physics>Heat>Thermal Expansion
What do you understand by thermal expansion of a substance ?
MEDIUM
Science>Physics>Heat>Thermal Expansion
One end of a steel girder in a bridge is not fixed, but is kept on rollers. Give the reason.
MEDIUM
Science>Physics>Heat>Thermal Expansion
Describe an experiment to show that liquids expand on heating.
EASY
Science>Physics>Heat>Thermal Expansion
Name two substances which expand on heating.
MEDIUM
Science>Physics>Heat>Thermal Expansion
Why are gaps left between successive rails on a railway track ?