Electromagnetic Waves Class 12 MCQs Questions with Answers

1.  
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?

2.  
Which of the following is called heat radiation?

3. Light Year is the unit of:

4. The waves used by artificial satellites for communication is

5. Displacement current is due to:

6. What is the full form of UHF?

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

8.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

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

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

11.  
 EMW are produced by:

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

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

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

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

16. Choose the wave relevant to telecommunication :

17. 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

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

19. Displacement current is always :

20. The existence of EMW was experimentally established by :