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 tank works on a principle of conversion solar energy into heat energy. The heater uses the sunlight energy i.e. the solar energy and converts it into heat energy to heat up the water tank . Therefore, enough sunlight is required to the solar tank to function out properly.

Complete answer:
Let us first understand what a Solar water heater is. Solar water heater is a device that uses solar heat energy to produce hot water. A solar water heater is made up of a solar collector that is mounted on a building's roof and connected to a water storage tank. Water is heated in a typical solar water heater by solar thermal energy absorbed by the collectors.

Owing to gravity, hot water with a lower density moves upwards and cold water with a higher density moves downwards from the tank. As a result, a solar water heater will only work if it receives any solar energy from the sun. The heat of the sun is blocked by the clouds on a cloudy day. On a cloudy day, a solar water heater cannot be used to get hot water since the Sun is not present, which is needed for the solar water heater to work.

Hence, the correct answer is option B.

Note: It's easy to get confused between a gloomy day and a windy day. On a windy day, it's difficult to tell if enough sunlight is hitting the solar heater. As a result, we have no way of knowing whether the heater will heat the water or not. As a result, cloudy days are the most suitable response.