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Class 7
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Physics
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Heat
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Easy Questions
Heat
Physics
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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
It does not radiate heat
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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>
Which of the following methods of flow of heat is (are) based on gravitational attraction?
A
Conduction
B
Convection
C
Radiation
D
All of these
Easy
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>
In a room containing air, heat can go from one place to another by :
A
conduction
B
convection
C
radiation
D
all of these
Easy
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>
Assertion (A): Woolen clothes keep the body warm in winter
Reason (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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>
In the following, which statement is correct :
a) A hot body emits hot radiations only.
b) A cold body absorbs the radiations only.
c) A cold body emits cold radiations only.
d) All the bodies emit and absorb radiations simultaneously.
A
a
B
b
C
c
D
d
Easy
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Celsius is a unit of :
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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The range of clinical thermometer is:
A
3
5
∘
C
to
4
2
∘
C
B
3
5
∘
F
to
4
2
∘
F
C
9
0
∘
F
to
1
1
2
∘
F
D
9
0
∘
C
to
1
1
2
∘
C
Easy
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>