A solar water heater cannot be used to get hot water on:

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A sunny day

A cloudy day

A hot day

A windy day

answer is B.

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Detailed Solution

Concept: The idea behind how a solar water tank operates is to transform solar energy into thermal energy. The heater heats the water tank by converting solar energy—the energy from the sun—into heat energy. Therefore, for the solar tank to operate well, there must be adequate sunshine.
A solar water heater is a device that generates hot water using solar thermal energy.
A solar collector that is attached to a water storage tank and positioned on the top of a building makes up a solar water heater.
In a conventional solar water heater, the collectors gather solar thermal energy to warm the water.
Gravity causes cold water with a greater density to flow downhill from the tank and hot water with a lower density to flow upward. As a result, a solar water heater can only function if it is exposed to sunlight. On a cloudy day, the clouds obscure the sun's heat. A solar water heater cannot be used to produce hot water on a cloudy day since the Sun must be present for it to function.
Hence, the correct answer is option (2) .

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