E-PolyLearning

31. Which one is having highest thermal conductivity?
a. Silver
b. Copper
c. Glass
d. Earth
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Answer: (a).Silver

32. What is the thermal conductivity of magnetite in W/m K?
a. 3.7
b. 3.8
c. 3.9
d. 4.0
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Answer: (b).3.8

33. Which one is having lowest thermal conductivity?
a. Furnace
b. Wool
c. Saw dust
d. Glass wool
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Answer: (d).Glass wool

34. What is the thermal conductivity of coal in W/m K?
a. 0.25
b. 0.26
c. 0.27
d. 0.28
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Answer: (b).0.26

35. What is the thermal conductivity of cotton in W/m K?
a. 0.03
b. 0.04
c. 0.05
d. 0.06
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Answer: (d).0.06

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