MEDIUM
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Convection takes place in 

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Important Questions on Heat

EASY

_____ is not necessary on radiation for heat transmission.

MEDIUM

A utensil, which is made of thick copper base, is placed on the gas burner to heat up water in it.

a) Describe briefly how heat is transferred:

ii) Spread through water in the utensil.

EASY
Why are the ventilators provided near the ceiling of rooms?
EASY
Which of the following causes the formation of a convection current?
EASY

Define the following terms:

Infrared radiation

EASY

Give reason for the following:

A hot air balloon rises up in the sky. 

EASY
_____ currents are produced when liquids and gases are heated.
MEDIUM
Why is a room heater placed near the floor and an air conditioner near the ceiling?
HARD
How can heat loss through radiation be reduced in a vacuum flask? Explain with a diagram.
EASY
Why is heat transfer by convection possible only in liquids and gases? 
EASY

Define the following term:

Land breeze

EASY
Which is fastest mode of heat transfer-Conduction, Convection or Radiation?
EASY

A utensil, which is made of thick copper base, is placed on the gas burner to heat up water in it.

Explain why water would boil faster when a lid is placed on the utensil.

EASY
Which form of matter does not transfer heat by convection?
MEDIUM
What is the atmospheric phenomenon that occurs in coastal regions due to the movement of warm and cool air? How do they differ from each other? 
EASY
Name one natural phenomenon which occurs due to the convection currents in air.
EASY

Give reason for the following:

The water pipe in a solar water heater is bent into the shape as given in the picture.

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EASY
Cotyledons are also called-
MEDIUM
What is radiant heat? How do black and white coloured objects absorb heat?
EASY
Hot water system and refrigerator also work on the same principle. How is their working similar? Explain.