Absorptivity and reflectivity of a perfect black body are respectively _______________?

Related Mcqs:

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?

A. More B. Less C. Same D. More or less; depends on the nature of solution...

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?

A. Long vertical evaporator B. Horizontal tube evaporator C. Agitated film evaporator D. Calandria vertical tube evaporator...

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

A. Increases B. Decreases C. Remains unchanged D. May increase or decrease; depends on its composition...

In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?

A. Is inversely proportional to the resistance across which the drop occurs B. And the wall are proportional to individual resistances C. And the wall is not related D. None of these...

Heat waves_____________________?

A. Cannot pass through vacuum B. Travel in straight line C. Can be reflected by a mirror D. Both B. and C....