Match List-I with List-II
| List-I (EM Waves) | List-II (Application/Use) |
| (A) UV Rays | (I) Diagnostic tool in medicine |
| (B) X-Rays | (II) Water purification |
| (C) Microwaves | (III) Communication, radar |
| (D) Infrared waves | (IV) Remote switches for TV sets |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (II), (B) - (I), (C) - (III), (D) - (IV)
Each part of the electromagnetic spectrum is used according to how it interacts with matter.
(A) UV Rays — this matches (II) Water purification. Ultraviolet radiation kills bacteria and germs, so it is used in water purifiers.
(B) X-Rays — this matches (I) Diagnostic tool in medicine. X-rays pass through soft tissue but are absorbed by bones, which show up on the X-ray image.
(C) Microwaves — this matches (III) Communication, radar. Their short wavelength allows narrow, well-directed beams, as needed in radar and communication links.
(D) Infrared waves — this matches (IV) Remote switches for TV sets. A TV remote uses an infrared LED to send its signal.
NCERT (2026-27):
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”
Infrared Waves – “… Electronic devices (for example semiconductor light emitting diodes) also emit infrared and are widely used in the remote switches of household electronic systems such as TV sets, video recorders and hi-fi systems.”
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.”