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Electromagnetic Waves · Question 45

AIPMT 2001MCQEasy📈 Topic in 38% papers+4−1
1

Biological importance of ozone layer is

  1. it stops ultraviolet rays
  2. ozone layer reduces greenhouse effect
  3. ozone layer reflects radio waves
  4. ozone layer controls O2/H2 ratio in atmosphere

Answer

(1) it stops ultraviolet rays

Solution

As per NCERT, the ozone layer in the stratosphere absorbs most of the harmful ultraviolet radiation from the sun, protecting living organisms (UV causes skin cancer, damages cells and eyes).

Radio waves are reflected by the ionosphere, not by ozone.

Answer: (1)

AIPMT 2001

Keep practising — Electromagnetic Waves

2

The frequency order for -rays (a), X-rays (b), UV rays (c) is

  1. b > a > c
  2. a > b > c
  3. c > b > a
  4. a > c > b
AIPMT 2000

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