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  4. A block of wood is floating in water at 0 ° C . The temperature of water is slowly raised from 0 ° C to 10 ° C . With the rise in temperature, the volume of block V above water level will

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Q. A block of wood is floating in water at $0 \,{}^\circ C$ . The temperature of water is slowly raised from $0 \,{}^\circ C$ to $10 \,{}^\circ C$ . With the rise in temperature, the volume of block $V$ above water level will

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Solution:

From $0 \,{}^\circ C$ to $4 \,{}^\circ C$ , density of water increases and from $4 \,{}^\circ C$ to $10 \,{}^\circ C$ , density of water decreases.
The volume of block above water will increase with increase in density of water as lesser submerged part is required to create a buoyancy force enough to balance weight of block. Similarly volume of block above water will decrease with decrease in density.