E-PolyLearning

16. Transmission of heat i.e. molecular is smallest in case of
a. Gases
b. Liquids
c. Alloys
d. Solids
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Answer: (a).Gases

17. Which one is not the unit of thermal conductivity?
a. kcal/m hr K
b. KJ/m hr K
c. W/m s K
d. Cal/cm s K
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Answer: (c).W/m s K

18. “Thermal conductivity represents the amount of heat conducted across unit area when a temperature difference of one kelvin”. True or false
a. True
b. False
c. May be
d. Can't say
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Answer: (b).False

19. Which of the following is the unit of thermal resistance?
a. degree/kcal
b. hour degree
c. s degree/kcal
d. degree/W
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Answer: (d).degree/W

20. Thermal conductivity is defined as the heat flow per unit time
a. When temperature gradient is unity
b. Across the wall with no temperature
c. Through a unit thickness of the wall
d. Across unit area where temperature gradient is unity
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Answer: (d).Across unit area where temperature gradient is unity

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