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19.

Heat conducted through unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called

A.	thermal resistance	B.	thermal coefficient
C.	temperature gradient	D.	thermal conductivity

20.

Heat flows from one body to other when they have

A.	different heat contents	B.	different specific heat
C.	different atomic structure	D.	different temperatures

21.

Heat is closely related with

A.	liquids	B.	energy
C.	temperature	D.	entropy

22.

Heat transfer by radiation mainly depends upon

A.	its temperature	B.	nature of the body
C.	kind and extent of its surface	D.	all of the above

23.

Heat transfer in liquid and gases takes place by

A.	conduction	B.	convection
C.	radiation	D.	conduction and convection

24.

Heat transfer takes place as per -

A.	zeroth law of thermodynamics	B.	first law of thermodynamic
C.	second law of the thermodynamics	D.	Kirchhoff law

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