Q1. | Unit of thermal conductivity in M.K.S. units is | ||||||
A. | kcal/kg m2 °C [Wrong Answer] |
B. | kcal-m/hr m2 °C [Correct Answer] |
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C. | kcal/hr m2 °C [Wrong Answer] |
D. | kcal-m/hr °C [Wrong Answer] |
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E. | kcal-m/m2 °C. [Wrong Answer] |
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Q2. | Unit of thermal conductivity in S.I. units is | ||||||
A. | J/m2 sec [Wrong Answer] |
B. | J/m °K sec [Wrong Answer] |
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C. | W/m °K [Wrong Answer] |
D. | (a) and (c) above [Wrong Answer] |
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E. | (b) and (c) above. [Correct Answer] |
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Q3. | Thermal conductivity of solid metals with rise in temperature normally | ||||||
A. | increases [Wrong Answer] |
B. | decreases [Correct Answer] |
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C. | remains constant [Wrong Answer] |
D. | may increase or decrease depending on temperature [Wrong Answer] |
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E. | unpredictable. [Wrong Answer] |
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Q4. | Thermal conductivity of non-metallic amorphous solids with decrease in temperature | ||||||
A. | increases [Wrong Answer] |
B. | decreases [Correct Answer] |
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C. | remains constant [Wrong Answer] |
D. | may increase or decrease depending on temperature [Wrong Answer] |
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E. | unpredictable. [Wrong Answer] |
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Q5. | When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by |
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A. | conduction [Correct Answer] |
B. | convection [Wrong Answer] |
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C. | radiation [Wrong Answer] |
D. | conduction and convection [Wrong Answer] |
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E. | convection and radiation. [Wrong Answer] |
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