Match List-I with List-II
| List-I | List-II |
| Electromagnetic waves | Application |
| (A) Infrared | (I) diagnostic tool in medicine |
| (B) X-rays | (II) water purification |
| (C) UV rays | (III) communication radar |
| (D) Microwaves | (IV) improving visibility in foggy days |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
Each part of the electromagnetic spectrum is used according to how it interacts with matter.
(A) Infrared — this matches (IV) improving visibility in foggy days. Infrared is scattered much less by fog and haze than visible light, so infrared imaging sees through them.
(B) X-rays — this matches (I) diagnostic tool in medicine. X-rays pass through soft tissue but are absorbed by bone, which gives X-ray images for diagnosis.
(C) UV rays — this matches (II) water purification. Ultraviolet light kills germs, so UV lamps are used to purify water.
(D) Microwaves — this matches (III) communication radar. The short wavelength of microwaves suits radar and long-distance communication.
NCERT (2026-27):
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”
Ultraviolet Rays – “… UV lamps are used to kill germs in water purifiers.”
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”