Communication Systems Class 12 MCQs Questions with Answers

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

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

3.  
The modulation index in amplitude modulation is:

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

5. Broadcasting antenna are generally:

6. Which of the following is not transducer?

7.  
Which of the following is the reason for signal distortion?

8. Communication channel consists of:

9.  
The frequency band used in the downlink of satellite communication is

10. AM is used for broadcasting because:

11. The audio frequencies range from:

12. Which is more advantageous?

13.  
The term used “to collect the information about an object and a place without physical contact” is called :

14.  
The waves that are bent down by the ionosphere are

15. Increase in frequency deviation results into:

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

17.  
What is the function of the receiver?

18.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

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

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