State one harmful effect each of the (a) ultraviolet and (b) infrared radiations.
(a) UV radiations cause health hazards like skin cancer over prolonged exposure.
(b) Infrared radiation, in high dose, can cause skin burns.
Name two sources, each of infrared radiations and ultraviolet radiations.
Give one use each of (a) microwaves , (b) ultraviolet radiations , (c) infrared radiations, and (d) gamma rays.
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