Match the LIST-I with LIST-II
| LIST-I Instrument/ function | LIST-II Electromagnetic waves used |
| A. Cell phones | I. Infrared |
| B. RADAR | II. X-rays |
| C. Remote Control | III. Radiowaves |
| D. Diagnosing Fractures | IV. Microwaves |
Choose the correct answer 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 application uses the part of the electromagnetic spectrum whose wavelength suits it.
(A) Cell phones — this matches (III) Radiowaves. Cellular phones carry voice in the ultra high frequency (UHF) band of radio waves.
(B) RADAR — this matches (IV) Microwaves. Their short wavelength gives a narrow beam that reflects well from aircraft and ships.
(C) Remote Control — this matches (I) Infrared. TV and AC remotes use infrared LEDs.
(D) Diagnosing Fractures — this matches (II) X-rays. X-rays pass through soft tissue but are absorbed by bone, so fractures show clearly.
NCERT (2026-27):
Radio Waves – “… Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.”
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.”
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”