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

Question.
A solar water heater cannot be used to get hot water on

(a) a sunny day

(b) a cloudy day

(c) a hot day

(d) a windy day

solution:

Option (b) a cloudy day is correct.

On cloudy day, heat radiations coming from the Sun do not reach the solar water heater.

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