Electromagnetic Waves Class 12 MCQs Questions with Answers

1. The waves used by artificial satellites for communication is

2. The existence of EMW was experimentally established by :

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

4. What is the full form of UHF?

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

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

7.  
Which of the following is called heat radiation?

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

9.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

10. Displacement current is due to:

11. 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

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

13. Light Year is the unit of:

14. Choose the wave relevant to telecommunication :

15.  
 EMW are produced by:

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

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

18. Displacement current is always :

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

20.  
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?