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7.

According to Prevost theory of heat exchange                        
A. it is impossible to transfer heat from low temperature source to t high temperature source B. heat transfer by radiation requires no medium
C. all bodies above absolute zero emit radiation D. heat transfer in most of the cases takes place by combination of conduction, convection and radiation



8.

According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to                        
A. absolute temperature B. square of temperature
C. fourth power of absolute temperature D. fourth power of temperature



9.

According to Stefan's law, the total radiation from a black body per second per unit area is proportional to                        
A. absolute temperature B. T2
C. T5 D. t




10.

According to Wien's law, the wavelength corresponding to maximum energy is proportion to                        
A. absolute temperature (T) B. I2
C. f D. t



11.

All radiations in a black body are                        
A. reflected B. refracted
C. transmitted D. absorbed



12.

Cork is a good insulator because it has                        
A. free electrons B. atoms colliding frequency
C. low density D. porous body



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