# Electromagnetic Waves MCQ Questions for Class 12 Physics Chapter 8 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 8 Electromagnetic Waves with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Electromagnetic Waves. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. Which of the following has/have zero average value in a plane electromagnetic wave?

(i) Both magnetic and electric fields
(ii) Electric field only
(iii) Magnetic field only
(iv) None of these

(i) Both magnetic and electric fields

## Q2. Which of the following laws was modified by Maxwell by introducing the displacement current?

(i) Gauss’s law
(ii) Ampere’s law
(iii) Biot-Savart’s law
(iv).None of these

(ii) Ampere’s law

(ii) Microwaves
(iii) γ-rays

(iii) γ-rays

## Q4. The source of electromagnetic waves can be a charge

(i) moving with a constant velocity.
(ii) moving in a circular orbit.
(iii) at rest.
(iv) none of these.

(ii) moving in a circular orbit.

(ii) Microwaves
(iii) γ-rays

(iii) γ-rays

(i) 1:5
(ii) 2:1
(iii) 1
(iv) 0

(iii) 1

## Q7. An electromagnetic wave can be produced, when charge is

(i) moving with a constant velocity
(ii) moving in a circular orbit
(iii) falling in an electric field
(iv) both (ii) and (iii)

(iv) both (ii) and (iii)

## Q8. Choose the wave relevant to telecommunication :

(i) ultraviolet
(ii) infrared
(iii) microwave
(iv) visible light

(iii) microwave

## Q9. Which of the following has minimum wavelength?

(i) Blue light
(ii) γ-rays
(iii) infrared rays
(iv) microwave

(ii) γ-rays

## Q10. What physical quantity is the same for X-rays of wavelength 10-10 m, red light of wavelength 680 nm and radio waves of wavelength 500 m?

(i) Wavelength
(ii) Frequency
(iii) Speed
(iv) None of these.

(iii) Speed

(i) zero
(ii) ????4
(iii) ????2
(iv) π

(i) zero

## Q12. Which basic oscillatory circuit is used these days to produce electromagnetic waves?

(i) LC oscillatory circuit
(ii) LCR circuit
(iii) Inductive circuit
(iv) Capacitive circuit

(i) LC oscillatory circuit

## Q13. If a variable frequency ac source is connected to a capacitor then with decrease in frequency the displacement current will

(i) increase
(ii) decrease
(iii) remains constant
(iv) first decrease then increase

(ii) decrease

## Q14. Which of the following EMW has highest wavelength?

(i) X-ray
(ii) ultraviolet rays
(iii) infrared rays
(iv) microwaves

(iii) infrared rays

(i) X-rays
(ii) γ-rays
(iv) Microwave

## Q16. The quantity √????0????0 represents

(i) speed of sound
(ii) speed of light in vacuum
(iii) speed of e.m. waves
(iv) inverse of speed of light in vacuum

(iv) inverse of speed of light in vacuum

## Q17. Is the ratio of frequencies of UV rays and IR rays in the glass more than, less than or equal to 1?

(i) Insufficient data
(ii) Equal to 1
(iii) Less than 1
(iv) More than 1

(iv) More than 1

## Q18. The waves used by artificial satellites for communication is

(i) microwaves
(ii) infrared waves
(iv) X-rays

(i) microwaves

## Q19. Displacement current is due to:

(i) the flow of electrons
(ii) the Varying electric field
(iii) the ionization of atmosphere
(iv) the flow of protons

(ii) the Varying electric field

## Q20. Electromagnetic waves are transverse in nature is evident by

(i) polarisation.
(ii) interference,
(iii) reflection.
(iv) diffraction.

(i) polarisation.

## Q21. From Maxwell’s hypothesis, a charging electric field gives rise to

(i) an electric field.
(ii) an induced emf.
(iii) a magnetic field.
(iv) a magnetic dipole.

(iii) a magnetic field.

## Q22. What is the full form of UHF?

(i) Under heavy frequency
(ii) Ultra-high frequency
(iii) Ultra heavy frequency
(iv) Under high frequency

(ii) Ultra-high frequency

## Q23. Which of the following electromagnetic waves is used in medicine to destroy cancer cells?

(i) IR-rays
(ii) Visible rays
(iii) Gamma rays
(iv) Ultraviolet rays

(iii) Gamma rays

## Q24. Displacement current is always :

(i) equal to conduction current
(ii) less than conduction current
(iii) greater than conduction current
(iv) the sum of current due to flow of positive and negative ions

(i) equal to conduction current

(i) Cosmic rays
(ii) γ-rays
(iii) β-rays
(iv) X-rays

(iii) β-rays

(i) Infrared
(ii) Ultraviolet
(iii) Microwave
(iv) X-rays

(i) Infrared

## Q27. Which among the following is an application of microwaves?

(i) Solar cells
(ii) Ovens
(iv) Burglar alarms

(ii) Ovens

## Q28. EMW are produced by:

(i) charge in uniform motion only
(ii) charge at rest only
(iii) accelerated or decelerated charge only
(iv) all of the above

(iii) accelerated or decelerated charge only

## Q29. Waves in decreasing order of their wavelength are

(i) X-rays, infrared rays, visible rays, radio waves
(ii) radio waves, visible rays, infrared rays, X-rays.
(iii) radio waves, infrared rays, visible rays, X-rays.
(iv) radio waves, ultraviolet rays, visible rays, X-rays.

(iii) radio waves, infrared rays, visible rays, X-rays.

(iv) microwaves

## Q31. A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?

(i) 30 m to 130 m
(ii) 40 m to 140 m
(iii) 20 m to 120 m
(iv) 10 m to 110 m

(iii) 20 m to 120 m

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