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

Answer 1

Hint: A solar water works on the principle of conversion solar energy into heat energy. The heater uses the sun’s solar energy and converts it into heat energy to heat the water in the tank. Therefore, it needs enough sunlight to work efficiently.

Complete step-by-step answer:
Let us first understand what a solar water heater is. A solar water heater is a device that uses solar energy to heat the water in the tank. A solar water heater converts the solar energy into heat energy. This heat energy is absorbed by a fluid. The heated fluid flows through the tank and heats the water in the tank.
You may have seen a solar plane on the top of the roofs of some houses. These solar panels help in the conversion of the solar energy into heat energy. The material that helps in the process in silicon.
Now, for a solar water heater to work properly, it requires solar energy. Solar energy is the energy that we receive from the sun. It is a natural energy and cannot be generated by the humans.
Therefore, for a solar heater to work, the rays of the sun must fall on the solar panels. Otherwise, the heater will not function.
On a cloudy day, the clouds will block the sunlight from reaching the heater. Therefore, the heater will not get enough solar energy and the water will not heat.
Hence, the solar water heater cannot be used to heat water on a cloudy day.

So, the correct answer is “Option B”.

Note: Students may get confused between of options cloudy day and windy day.
On a windy day we cannot determine whether enough sunlight is reaching the solar heater or not. Hence, we cannot determine whether the heater will be able to heat the water or not.
Therefore, the most appropriate answer is cloudy day.