# Heat

## Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness, because they :

A
behave like a thermos
B
have lesser thickness
C
allow heat from atmosphere to the body
D
enclose between them a layer of air
Easy
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## When a body has the same temperature as that of its surroundings :

A
B
It radiates same quantity of heat as it receives from the surroundings
C
It radiates less quantity of heat as it receives from the surroundings
D
It radiates more quantity of heat as it receives from the surroundings.
Easy
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A
conduction
B
convection
C
D
all of these
Easy
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## Assertion (A): Woolen clothes keep the body warm in winterReason (R): Air is bad conductor of heat

A
Both A and R are true,
B
Both A and R are false
C
Both A and R are true, R is correct explanation of A
D
Both A and R are true, R is not correct explanation of A
Easy
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## A) Heat transfer by conduction and convection require a material medium.B) Heat transfer by radiation doesn't require a material medium.

A
both A and B are true
B
A is true but B is false
C
B is true but A is false
D
both A and B are false
Easy
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A
Temperature
B
Heat
C
Specific heat
D
Latent heat
Easy
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## Radiation is passing through a transparent medium, then :

A
the temperature of medium increases
B
the temperature of medium decreases
C
the temperature of medium does not alter
D
the temperature of medium first increases and then becomes steady
Easy
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