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49.

Thermal conductivity of solid metals with rise in temperature normally                        
A. increases B. decreases
C. remains constant D. may increase or decrease depending on temperature



50.

Thermal conductivity of water at 20°C is of the order of                        
A. 0.1 B. 0.23
C. 0.42 D. 0.51



51.

Thermal conductivity of water in general with rise in temperature                        
A. increases B. decreases
C. remains constant D. may increase or decrease depending on temperature




52.

Thermal conductivity of wood depends on                        
A. moisture B. density
C. temperature D. all of the above



53.

Thermal diffusivity of a substance is .                        
A. proportional of thermal conductivity B. inversely proportional to k
C. proportional to (kf D. inversely proportional to k2



54.

Total emissivity of polished silver compared to black body is                        
A. same B. higher
C. more or less same D. very much lower



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