Electromagnetic Waves Class 12 MCQs Questions with Answers

1. Choose the wave relevant to telecommunication :

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

3.  
Which of the following is called heat radiation?

4.  
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?

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

6.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

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

8. The existence of EMW was experimentally established by :

9. What is the full form of UHF?

10. Displacement current is always :

11.  
 EMW are produced by:

12. 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

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

14. The waves used by artificial satellites for communication is

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

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

17. Displacement current is due to:

18. Light Year is the unit of:

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

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