Electromagnetic Waves Class 12 MCQs Questions with Answers

1. Light Year is the unit of:

2.  
Which of the following is called heat radiation?

3. Displacement current is due to:

4. Choose the wave relevant to telecommunication :

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

6. The waves used by artificial satellites for communication is

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

9.  
 EMW are produced by:

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

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

12. The existence of EMW was experimentally established by :

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

14. 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

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

16. What is the full form of UHF?

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

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

19.  
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

20. Displacement current is always :