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Electromagnetic Waves · Question 43

AIPMT 2002MCQEasy📈 Topic in 75% papers+4−1
1

The velocity of electromagnetic wave is parallel to

  1. B E
  2. E B
  3. E
  4. B

Answer

(2) E B

Solution

As per NCERT, in an electromagnetic wave E and B are perpendicular to each other and to the direction of propagation.

E.g. E along x, B along y wave travels along +z, i.e. along i j = k

The velocity is parallel to E B

Answer: (2)

AIPMT 2002

Keep practising — Electromagnetic Waves

2

What is the cause of greenhouse effect?

  1. infra-red rays
  2. ultra violet rays
  3. X-rays
  4. radio waves.
AIPMT 2002
3

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
AIPMT 2001
4

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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