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Physics 9 Chapter 9 - Transfer of Heat - 6
1.
What is the thermal conductivity of rubber?
a) 105 Wm
-1
K
-1
b) 245 Wm
-1
K
-1
c) 0.2 Wm
-1
K
-1
d) 0.028 Wm
-1
K
-1
2.
What is the SI unit of thermal conductivity?
a) WK
-1
b) Wm1K1
c) Wm
-1
d) Wm
-1
K
-1
3.
What is the thermal conductivity of silver?
a) 430 Wm
-1
K
-1
b) 0.028 Wm
-1
K
-1
c) 105 Wm
-1
K
-1
d) 245 Wm
-1
K
-1
4.
What is the thermal conductivity of water?
a) 0.028 Wm
-1
K
-1
b) 105 Wm
-1
K
-1
c) 245 Wm
-1
K
-1
d) 0.59 Wm
-1
K
-1
5.
What is the thermal conductivity of wood?
a) 0.028 Wm
-1
K
-1
b) 105 Wm
-1
K
-1
c) 0.03 Wm
-1
K
-1
d) 245 Wm
-1
K
-1
6.
By which hot water tanks are insulated?
a) Both b and c
b) Plastic lagging
c) Foam lagging
d) Aluminium lagging
7.
With which wall cavities are filled?
a) Plastic foam
b) Both b and c
c) Wool
d) Aluminium
8.
By which ceiling of rooms are covered?
a) Hot plates
b) Aluminium materials
c) Insulating materials
d) Copper materials
9.
Which of the following measures should be taken to save energy?
a) Ceilings of rooms is covered with insulating materials
b) All of these
c) Hot water tanks are insulated by foam lagging
d) Wall cavities are filled with plastic foam
10.
What is present between the double glazed window panes?
a) Oil
b) Air
c) Mica
d) Water
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