Electromagnetic Waves Class 12 MCQs Questions with Answers

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

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

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

4. Choose the wave relevant to telecommunication :

5. The existence of EMW was experimentally established by :

6. 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

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

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

9. Displacement current is always :

10. Displacement current is due to:

11. The waves used by artificial satellites for communication is

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

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

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

15.  
Which of the following is called heat radiation?

16. Light Year is the unit of:

17.  
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?

18. What is the full form of UHF?

19.  
 EMW are produced by:

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