Which of the following are used in electric water filters to kill all the harmful micro-organisms present in tap water and make it absolutely safe for drinking?
A. infrared radiation
B. gamma radiation
C. visible radiation
D. ultraviolet radiation
Answer:D
Which of the following are used in electric water filters to kill all the harmful micro-organisms present in tap water and make it absolutely safe for drinking?
A. infrared radiation B. gamma radiation C. visible radiation D. ultraviolet radiation