Communication Systems Class 12 MCQs Questions with Answers

1.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

2. The term used “to collect the information about an object and a place without physical contact” is called :

3. Which of the following is not transducer?

4.  
The waves that are bent down by the ionosphere are

5. In space communication, the sound waves can be sent from one place to another:

6.  
The frequency band used in the downlink of satellite communication is

7.  
The modulation index in amplitude modulation is:

8.  
The term used “to collect the information about an object and a place without physical contact” is called :

9.  
Which of the following is the reason for signal distortion?

10. Increase in frequency deviation results into:

11. The audio frequencies range from:

12. Broadcasting antenna are generally:

13. The length of a half wave dipole at 30 mega-hertz is:

14. In modulation process, radio frequency wave is termed as

15. Communication channel consists of:

16. The space waves which are affected seriously by atmospheric conditions are:

17. Name the man who was first to place his foot on the moon and in which year:

18.  
What is the function of the receiver?

19. Which is more advantageous?

20. AM is used for broadcasting because: