Match List - I with List - II.
| List – I Electromagnetic waves | List – II Uses | ||
|---|---|---|---|
| (A) | Radio waves | (I) | Aircraft navigation |
| (B) | Ultraviolet rays | (II) | Physical therapy |
| (C) | Infrared waves | (III) | Television communication systems |
| (D) | Microwaves | (IV) | Kill germs in water purifiers |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
Each part of the electromagnetic spectrum is used for the purpose that suits its wavelength and energy.
(A) Radio waves — this matches (III) Television communication systems. Radio and television signals are carried by waves of long wavelength.
(B) Ultraviolet rays — this matches (IV) Kill germs in water purifiers. The energetic ultraviolet photons destroy bacteria and other germs in water.
(C) Infrared waves — this matches (II) Physical therapy. Infrared is the heating radiation, used to warm muscles and relieve pain.
(D) Microwaves — this matches (I) Aircraft navigation. Microwaves are used in radar, which locates and guides aircraft.
NCERT (2026-27):
Radio Waves – “Radio waves are produced by the accelerated motion of charges in conducting wires. They are used in radio and television communication systems.”
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”
Infrared Waves – “… Infrared lamps are used in physical therapy.”
Ultraviolet Rays – “… UV lamps are used to kill germs in water purifiers.”