Match List-I with List-II
| List-I | List-II |
| (A) Remote control of a TV | (I) Radio waves |
| (B) Radar | (II) Infrared waves |
| (C) Sonar | (III) Microwaves |
| (D) Mobile phones | (IV) Ultrasonic waves |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (II), (B) - (III), (C) - (IV), (D) - (I)
Each device uses the band of waves that suits its range and medium: short-range line-of-sight signals, reflection from distant objects, or travel through water.
(A) Remote control of a TV — this matches (II) Infrared waves. The remote sends short-range pulses from an infrared LED to a detector on the set.
(B) Radar — this matches (III) Microwaves. Short-wavelength microwaves form narrow beams that reflect well from aircraft and ships.
(C) Sonar — this matches (IV) Ultrasonic waves. Electromagnetic waves are absorbed quickly in water, so sonar uses ultrasonic sound waves, which travel far under water.
(D) Mobile phones — this matches (I) Radio waves. Cellular phones transmit voice and data in the ultra high frequency (UHF) band of radio waves.