Heat Transfer
A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?

Sphere
Cube
All of these
Plate

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Heat Transfer
Leidenfrost point is a term concerned with the

Condensation of the saturated vapor on a cold surface
Heat transfer between two highly viscous liquids
Concentration of a corrosive solution by evaporation
Boiling of a liquid on a hot surface

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