Q. Which of the following radiation is used to get relief from body aches ?

Correct Answer: a) Infra-red radiation

Explanation: Infra-red radiation is commonly used to provide relief from body aches and muscle pain. Infra-red rays have the ability to penetrate the skin and generate heat in the tissues, which helps improve blood circulation, relax muscles, and reduce pain or stiffness. This is why infra-red lamps or heating pads are often used in physical therapy and pain relief treatments. UV radiation and visible radiation do not have the same therapeutic effects for body aches, and hence they are not suitable for this purpose.