Communication Systems Class 12 MCQs Questions with Answers

1. Which is more advantageous?

2.  
The modulation index in amplitude modulation is:

3.  
Which of the following is the reason for signal distortion?

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

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

6. The audio frequencies range from:

7.  
The waves that are bent down by the ionosphere are

8. Which of the following is not transducer?

9. Communication channel consists of:

10. AM is used for broadcasting because:

11.  
The term used “to collect the information about an object and a place without physical contact” is called :

12. Increase in frequency deviation results into:

13. Broadcasting antenna are generally:

14.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

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

16.  
What is the function of the receiver?

17.  
The frequency band used in the downlink of satellite communication is

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

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

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