Match the LIST-I with LIST-II
| LIST-I | LIST-II | ||
| (Electromagnetic Waves) | (Uses) | ||
| A. | Microwaves | I. | Medical diagnosis and treatment for certain forms of cancer |
| B. | X-rays | II. | Remote controls |
| C. | Radio waves | III. | In Radar communication |
| D. | Infrared rays | IV. | Cellular phones |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A - III, B - I, C - IV, D - II
Each band of the electromagnetic spectrum is used where its wavelength and penetration suit the task.
(A) Microwaves — this matches (III) In Radar communication. Their short wavelength (millimetres to centimetres) gives narrow beams that reflect well from aircraft and ships, which suits radar.
(B) X-rays — this matches (I) Medical diagnosis and treatment for certain forms of cancer. X-rays pass through soft tissue but are absorbed by bone, which makes radiographs possible, and controlled doses destroy cancer cells.
(C) Radio waves — this matches (IV) Cellular phones. Mobile phones carry voice on radio waves in the UHF band.
(D) Infrared rays — this matches (II) Remote controls. Television and air-conditioner remotes send their signals as infrared pulses.
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.”