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Electromagnetic Waves · Question 36

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 75% papers+4−1
1

Which of the following statements is false for the properties of electromagnetic waves?

  1. Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.
  2. The energy in electromagnetic wave is divided equally between electric and magnetic vectors.
  3. Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
  4. These waves do not require any material medium for propagation.

Answer

(3) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.

Solution

In an electromagnetic wave, E and B oscillate in phase (maxima and minima together) — statement (1) is true.

The average energy densities of the electric and magnetic fields are equal — statement (2) is true.

E and B are perpendicular to each other and to the direction of propagation — so statement (3), which says they are parallel, is false.

EM waves need no material medium — statement (4) is true.

Answer: (3)

AIPMT 2010 (Prelims)

Keep practising — Electromagnetic Waves

2

The electric field part of an electromagnetic wave in a medium is represented by Ex = 0; Ey = 2.5 NC [ (2 106 rads )t - ( 10-2 radm )x ]; Ez = 0. The wave is

  1. moving along x direction with frequency 106 Hz and wavelength 100 m.
  2. moving along x direction with frequency 106 Hz and wavelength 200 m.
  3. moving along -x direction with frequency 106 Hz and wavelength 200 m.
  4. moving along y direction with frequency 2 106 Hz and wavelength 200 m.
AIPMT 2009
3

The velocity of electromagnetic radiation in a medium of permittivity 0 and permeability 0 is given by

  1. 1 0 0
  2. 0 0
  3. 0 0
  4. 0 0
AIPMT 2008
4

The electric and magnetic field of an electromagnetic wave are

  1. in opposite phase and perpendicular to each other
  2. in opposite phase and parallel to each other
  3. in phase and perpendicular to each other
  4. in phase and parallel to each other
AIPMT 2007
5

If v, x and m represent the wavelengths of visible light, X-rays and microwaves respectively, then

  1. m > x > v
  2. m > v > x
  3. v > x > m
  4. v > m > x
AIPMT 2005
6

We consider the radiation emitted by the human body. Which one of the following statements is true?

  1. The radiation emitted is in the infra-red region
  2. The radiation emitted only during the day
  3. The radiation is emitted during the summers and absorbed during the winters
  4. The radiation emitted lies in the ultraviolet region and hence is not visible
AIPMT 2003
7

Which of the following rays are not electromagnetic waves?

  1. X-rays
  2. -rays
  3. -rays
  4. heat rays
AIPMT 2003
8

The velocity of electromagnetic wave is parallel to

  1. B E
  2. E B
  3. E
  4. B
AIPMT 2002
9

What is the cause of greenhouse effect?

  1. infra-red rays
  2. ultra violet rays
  3. X-rays
  4. radio waves.
AIPMT 2002
10

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
11

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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