JEE Main 2023 · 31 January · evening · Single correct · +4 / −1
Match List I with List II
Choose the correct answer from the options given below:
| LIST I | LIST II | ||
|---|---|---|---|
| A. | Microwaves | I. | Physiotherapy |
| B. | UV rays | II. | Treatment of cancer |
| C. | Infra-red light | III. | Lasik eye surgery |
| D. | X-ray | IV. | Aircraft navigation |
- (a) A - IV, B - III, C - I, D - II
- (b) A - II, B - IV, C - III, D - I
- (c) A - III, B - II, C - I, D - IV
- (d) A - IV, B - I, C - II, D - III
Answer and solution
Answer (a) A - IV, B - III, C - I, D - II
Solution
Physics sir · 2 steps
Match each wave to the job its frequency suits: radar, eye surgery, warmth, and deep penetration.
- Think of the property. Each use depends on what that band does best. Short wavelengths cut precisely or penetrate deep, and infrared mainly heats.
Wave Key property Use A. Microwaves short enough to reflect sharply off aircraft, pass through clouds IV. Aircraft navigation (radar) B. UV rays high-energy photons from an excimer laser reshape the cornea precisely III. Lasik eye surgery C. Infra-red absorbed by tissue as heat I. Physiotherapy (heat treatment) D. X-rays highly penetrating, can destroy cancer cells II. Treatment of cancer - So. The matching is A - IV, B - III, C - I, D - II, which is option (a).
The idea to keep. For use-matching questions, ask what each band does physically: microwaves for radar, UV for Lasik, infrared for heating, X-rays and gamma rays for penetrating tissue.
Answer from the NTA final answer key. Solution by PrepWiser.