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Class 7
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Air Expands on heating
Air Expands on heating
Theory
Theory
Procedure
Video
Simulator
Viva voce
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1)
When air is heated, its volume:
Creates high pressure
Decreases
Will not be affected
Increases
2)
Wheels of a car become tight on filling air because
Air exerts pressure.
Air contracts on cooling
Air expands on heating
Air does not exert pressure
3)
The warm air is
None of these
Equal to the weight of cold air
Lighter than the cold air
Heavier than the cold air
4)
Air expands on
None
On its own
Heating
Cooling
5)
Identify the concept behind working of ventilators.
Air expands on heating
Air contracts on cooling
Air contracts on heating
Metal expands on heating
6)
Air……… on heating and ……… on cooling
No change
Contracts expands
Expands, No Change
Expands, Contracts
7)
What happens when air is heated?
It expands and becomes heavier
It contacts and become lighter
It expands and become lighter
It contracts and become heavier
8)
Hot air
Is lighter and comes down
Is heavier and comes down
Is heavier and rises up
Is lighter and rises up
9)
What happens to the air molecules in hot air?
Molecules in air move slower and come closer
Molecules in air move slower and moves apart from each other
Molecules in air move faster and moves apart from each other
Molecules in air move faster and come closer
