The table lists parts of the electromagnetic spectrum and their major applications. Match List-I (P Microwave, Q UV rays, R Gamma rays, S Radio wave) with List-II (I For purifying the water, II For warming the food, III For AM and FM communication systems, IV For treating the cancer cells). The correct option is:
- A.P-I, Q-II, R-III, S-IV
- B.P-I, Q-IV, R-II, S-III
- C.P-II, Q-I, R-IV, S-III✓
- D.P-II, Q-IV, R-III, S-I
Correct Answer
(C) P-II, Q-I, R-IV, S-III
Solution & Explanation
Match each EM band to its standard application by its physical effect. P — Microwave: microwaves are strongly absorbed by water molecules, heating them, so they are used for warming/cooking food → P-II. Q — UV rays: UV radiation is germicidal (it destroys bacteria and microbes), so it is used for purifying/sterilising water → Q-I. R — Gamma rays: high-energy gamma photons kill malignant cells, so they are used in radiotherapy for treating cancer cells → R-IV. S — Radio waves: radio waves are the carriers of AM and FM broadcast signals → S-III. Therefore the correct matching is P-II, Q-I, R-IV, S-III, which is option C.
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