Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Prandtl number and Reynold number
Grashoff number and Prandtl number
Grashoff number, Prandtl number and Reynold number
Grashoff number and Reynold number

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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
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
All of these

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