| 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
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| 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
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| 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
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| 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
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| 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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