|Consider the following statements regarding the solar water heater.|
|1. The copper pipes are used for the solar water heaters.|
|2. The pipes are used for heating and are in the spiral shape.|
|3. The pipes are painted with black colour.|
|4. It works on the principle of greenhouse effect. Which of the statements given above are correct?|
A) 1, 3 and 4
B) 1 and 2
C) 2 and 3
D) All of these
Correct Answer: D
Solution :[d] All the given statements are correct. Solar water heater is based on the principles of surface absorption and greenhouse effect. The copper pipes are used for heating and are in the spiral shape. The pipes are painted with black colour to absorb maximum heat.
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