It is known that wax contracts on solidification. If molten…

Physics Thermometry, Thermal Expansion and Calorimetry Mix MCQ (Single Correct)

It is known that wax contracts on solidification. If molten wax is taken in a large vessel and it is allowed to cool slowly, then

It will start solidifying from the top downward

It will start solidifying from the bottom upward

It will start solidifying from the middle, upward and downward at equal rates

The whole mass will solidify simultaneously

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The correct answer is:

Substances are classified into two categories

(i) water like substances which expand on solidification.

(ii) CO 2 like (Wax, Ghee etc.) which contract on solidification.

Their behaviour regarding solidification is opposite.

Melting point of ice decreases with rise of temp but that of wax etc increases with increase in temperature. Similarly ice starts forming from top downwards whereas wax starts its formation from bottom.

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