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Physics 9 Chapter 9 - Transfer of Heat - 5
1.
Which of the following are the examples of bad conductors?
a) Wool
b) Copper
c) Aluminium
d) Iron
2.
What is the thermal conductivity of copper?
a) 105 Wm
-1
K
-1
b) 400 Wm
-1
K
-1
c) 245 Wm
-1
K
-1
d) 0.028 Wm
-1
K
-1
3.
Which of the following are the examples of bad conductors?
a) Iron
b) Copper
c) Aluminium
d) Glass
4.
What is the thermal conductivity of glass?
a) 245 Wm
-1
K
-1
b) 105 Wm
-1
K
-1
c) 0.028 Wm
-1
K
-1
d) 0.8 Wm
-1
K
-1
5.
Which of the following are the examples of bad conductors?
a) Rubber
b) Iron
c) Aluminium
d) Copper
6.
What is the thermal conductivity of ice?
a) 1.7 Wm
-1
K
-1
b) 245 Wm
-1
K
-1
c) 0.028 Wm
-1
K
-1
d) 105 Wm
-1
K
-1
7.
What is the thermal conductivity of iron?
a) 105 Wm
-1
K
-1
b) 0.028 Wm
-1
K
-1
c) 245 Wm
-1
K
-1
d) 85 Wm
-1
K
-1
8.
What is the thermal conductivity of lead?
a) 105 Wm
-1
K
-1
b) 35 Wm
-1
K
-1
c) 245 Wm
-1
K
-1
d) 0.028 Wm
-1
K
-1
9.
Why Styrofoam boxes are used to keep food hot for a long time?
a) Because styrofoam boxes are bad conductor of heat
b) Because styrofoam boxes are made of iron
c) Because styrofoam boxes are good conductor of heat
d) Because styrofoam boxes are easily available at markets
10.
What is the thermal conductivity of plastic foam?
a) 245 Wm
-1
K
-1
b) 0.028 Wm
-1
K
-1
c) 0.03 Wm
-1
K
-1
d) 105 Wm
-1
K
-1
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