Match Column-1 with Column-2.
In the table given below, certain EM waves are listed in Column-1 and their uses in Column-2 not necessarily in that order.
| Column-1 | Column-2 | ||
| Electromagnetic waves | Uses | ||
| (A) | Microwaves | (I) | Medical diagnostic |
| (B) | Ultraviolet rays | (II) | Night vision |
| (C) | X-rays | (III) | Used in RADAR |
| (D) | Infra red rays | (IV) | Water purification |
Choose the correct matching of waves and their uses from the options given below :
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
Each band of the electromagnetic spectrum is used for the property that its wavelength gives it.
(A) Microwaves — this matches (III) Used in RADAR. Their short wavelengths (a few cm) form narrow beams that reflect well from aircraft, so they are used in RADAR.
(B) Ultraviolet rays — this matches (IV) Water purification. UV radiation kills germs, so UV lamps are used to purify water.
(C) X-rays — this matches (I) Medical diagnostic. X-rays pass through soft tissue but are absorbed by bones, so they are used for diagnosis.
(D) Infra red rays — this matches (II) Night vision. Warm bodies emit infrared radiation, which night-vision devices detect in the dark.
NCERT (2026-27):
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”
Ultraviolet Rays – “… UV lamps are used to kill germs in water purifiers.”
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”