Electromagnetic Waves Class 12 MCQs Questions with Answers

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

2. Displacement current is always :

3. The correct option, if speeds of gamma rays, X-rays and microwave are Vg, Vx an Vm respectively will be.

4. The waves used by artificial satellites for communication is

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

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

7. Choose the wave relevant to telecommunication :

8. The existence of EMW was experimentally established by :

9. Light Year is the unit of:

10. Displacement current is due to:

11.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

12. What is the full form of UHF?

13. Frequency of a wave is 6 × 1015. Hz. The wave is 

14.  
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?

15. Which of the following statement is false for the properties of electromagnetic waves?

16.  
Which of the following is called heat radiation?

17.  
 EMW are produced by:

18. Maxwell in his famous equations of electromagnetism introduced the concept of

19. A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. The frequency of electromagnetic waves produced by the oscillator is

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