First slide

Thermal expansion

Question

A beaker is filled with water at 4°C at one time; the temperature is increased by a few °C above 4°C and at another time it is decreased by few °C below 4°C. One shall
observe that :

Easy

A

The level remains constant in each case
B

In case I water overflows while in II case its level comes down
C

In case II water overflows while in I case its level comes down
D

Water overflows in both the cases

Solution

At $4^{0} C$ density of water is maximum .so if water is heated and cooled above and below $4^{0} C$ then its density will decrease,so the volume will increase,hence water overflow in both if the beaker is filled up to its brim .

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