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Physics 9 Chapter 9 - Transfer of Heat - 4
1.
What is âkâ called in the following given formula:
Rate of flow of heat = kA (T
1
- T
2
) / L?
a) Thermal conductivity
b) Rate of flow of heat
c) Cross-sectional area of the solid
d) Gravitational constant
2.
Upon which of the following, the value of ‘k’ in the rate of flow of heat depends?
a) Nature of the substance
b) Resistance
c) Acceleration due to gravity
d) Gravitational constant
3.
What is the rate of flow of heat across the opposite faces of a metre cube of a substance maintained at a temperature difference of one kelvin called?
a) Thermal conductivity
b) Acceleration due to gravity
c) Gravitational constant
d) Rate of flow of heat
4.
What is the thermal conductivity of dry air?
a) 245 Wm
-1
K
-1
b) 0.6 Wm
-1
K
-1
c) 0.028 Wm
-1
K
-1
d) 105 Wm
-1
K
-1
5.
Which of the following are the examples of bad conductors?
a) Wood
b) Copper
c) Aluminium
d) Iron
6.
What is the thermal conductivity of aluminium?
a) 245 Wm
-1
K
-1
b) 0.028 Wm
-1
K
-1
c) 0.6 Wm
-1
K
-1
d) 105 Wm
-1
K
-1
7.
Which of the following are the examples of bad conductors?
a) Aluminium
b) Cork
c) Copper
d) Iron
8.
What is the thermal conductivity of brass?
a) 105 Wm
-1
K
-1
b) 0.6 Wm
-1
K
-1
c) 0.028 Wm
-1
K
-1
d) 245 Wm
-1
K
-1
9.
Which of the following are the examples of bad conductors?
a) Copper
b) Cotton
c) Iron
d) Aluminium
10.
What is the thermal conductivity of brick?
a) 0.028 Wm
-1
K
-1
b) 245 Wm
-1
K
-1
c) 0.6 Wm
-1
K
-1
d) 105 Wm
-1
K
-1
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