EASY
Earn 100

What is the meaning of sources of heat?

Important Questions on Measurement and Effects of Heat

EASY
Ice is used in a cooler in order to cool its contents. Which of the following will speed up the cooling process?
MEDIUM
Name the physical quantity which is measured in calories. How is calorie related to the SI unit of that quantity?
MEDIUM
A thin paper cup filled with water does not catch fire when placed over a flame. This is because
MEDIUM
Water has higher heat capacity than stone. Compare the time taken by water and stone to heat up and cool down.
EASY
Give one word for a form of energy which causes sensation of hotness and coldness.
EASY
What are the conditions for transfer of heat energy?
MEDIUM
Why do electric wires sag in summers?
EASY
In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?
EASY

Give one word for the following.

One effect of heat.

MEDIUM
In winter, we feel warmer when wearing two sweaters one on top of the other rather than wearing one thick sweater. Can you give a reason for this? 
EASY
Why is it advised not to fill air into cycle tyres very tightly during summer?
MEDIUM
Mention three changes that heat causes in substances.
MEDIUM
Why are double glass window panes used in cold countries?
EASY

Give one word for the following:

It is a form of energy which causes sensation of hotness and coldness.