Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
All of these
Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

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Heat and Mass Transfer
Conduction is a process of heat transfer

None of these
From one particle of the body to another by the actual motion of the heated particles
From one particle of the body to another without the actual motion of the particles
From a hot body to a cold body, in a straight line, without affecting the intervening medium

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