Q.

The light rays used for eliminating bacteria –

A. X-rays
B. infrared rays
C. microwave radiation
D. ultra-violet radiation
Answer» D. ultra-violet radiation
Explanation: Ultraviolet radiation is used to kill microorganisms, molds and fungus in various environmental applications. UV sterilization is used for air-purification systems, water purification, aquarium and pond maintenance, laboratory hygiene and food and beverage protection.
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