Match the LIST-I with LIST-II
| LIST-I | LIST-II | ||
|---|---|---|---|
| (Electromagnetic waves) | (Application) | ||
| A. | Infrared waves | I. | As a diagnostic tool in medicine and to destroy certain forms of cancer |
| B. | Ultraviolet rays | II. | Cellular phones |
| C. | X-rays | III. | In remote switches of TV sets |
| D. | Radio waves | IV. | In LASIK eye surgery |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A-III, B-IV, C-I, D-II
Each application follows from how the band of the electromagnetic spectrum is produced and absorbed.
(A) Infrared waves — this matches (III) In remote switches of TV sets. Remote controls use infrared LEDs, whose beam carries the signal to the receiver in the TV.
(B) Ultraviolet rays — this matches (IV) In LASIK eye surgery. A focused UV laser reshapes the cornea by removing thin layers of tissue.
(C) X-rays — this matches (I) As a diagnostic tool in medicine and to destroy certain forms of cancer. X-rays pass through soft tissue but are absorbed by bone, and in large doses they kill living cells.
(D) Radio waves — this matches (II) Cellular phones. Mobile phones send voice and data on radio waves in the ultrahigh-frequency band.
NCERT (2026-27):
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 – “… Due to its shorter wavelengths, UV radiations can be focussed into very narrow beams for high precision applications such as LASIK (Laser- assisted in situ keratomileusis) eye surgery.”
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”
Radio Waves – “… Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.”