Electromagnetic Waves Class 12 MCQs Questions with Answers

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

2.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

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

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

5. The existence of EMW was experimentally established by :

6. Choose the wave relevant to telecommunication :

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

8.  
 EMW are produced by:

9. Displacement current is always :

10.  
Which of the following is called heat radiation?

11. Displacement current is due to:

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

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

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

15.  
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?

16. What is the full form of UHF?

17. Light Year is the unit of:

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

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. The waves used by artificial satellites for communication is