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Electromagnetic Waves · Question 40

AIPMT 2005MCQEasy📈 Topic in 38% papers+4−1
1

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

Answer

(2) m > v > x

Solution

As per NCERT, the electromagnetic spectrum in order of decreasing wavelength is:

radio waves > microwaves > infrared > visible > ultraviolet > X-rays > gamma rays

Microwaves: 10-3 to 10-1 m

Visible light: 4 10-7 to 7 10-7 m

X-rays: 10-12 to 10-8 m

m > v > x

Answer: (2)

AIPMT 2005

Keep practising — Electromagnetic Waves

2

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
3

Which of the following rays are not electromagnetic waves?

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

The velocity of electromagnetic wave is parallel to

  1. B E
  2. E B
  3. E
  4. B
AIPMT 2002
5

What is the cause of greenhouse effect?

  1. infra-red rays
  2. ultra violet rays
  3. X-rays
  4. radio waves.
AIPMT 2002
6

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
7

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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