Electromagnetic Waves Class 12 MCQs Questions with Answers

1. Displacement current is due to:

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

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

4. The waves used by artificial satellites for communication is

5. The existence of EMW was experimentally established by :

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

7.  
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?

8.  
 EMW are produced by:

9. Choose the wave relevant to telecommunication :

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

11.  
Which of the following is called heat radiation?

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

13. Displacement current is always :

14.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

15. 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

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

17. What is the full form of UHF?

18. Light Year is the unit of:

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

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