Match the LIST-I with LIST-II
| LIST-I (Electromagnetic wave) | LIST-II (Application/Importance) | ||
|---|---|---|---|
| A. | Ultraviolet rays | I. | to treat muscular strain |
| B. | X-rays | II. | for broadcasting |
| C. | Infrared waves | III. | to detect bone fractures |
| D. | Radio waves | IV. | absorbed by ozone layer of atmosphere |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-IV, B-III, C-I, D-II
Each band of the spectrum is used according to how it is produced, absorbed or transmitted.
(A) Ultraviolet rays — this matches (IV) absorbed by ozone layer of atmosphere. The ozone layer absorbs most of the Sun’s UV radiation and protects life on Earth.
(B) X-rays — this matches (III) to detect bone fractures. They pass through soft tissue but are absorbed by bone.
(C) Infrared waves — this matches (I) to treat muscular strain. Infrared is heat radiation and is used in physical therapy.
(D) Radio waves — this matches (II) for broadcasting. They are used in radio and television communication.
NCERT (2026-27):
Radio Waves – “Radio waves are produced by the accelerated motion of charges in conducting wires. They are used in radio and television communication systems.”
Infrared Waves – “… Infrared lamps are used in physical therapy.”
Ultraviolet Rays – “… The sun is an important source of ultraviolet light. But fortunately, most of it is absorbed in the ozone layer in the atmosphere at an altitude of about 40 – 50 km.”
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”