Communication Systems Class 12 MCQs Questions with Answers

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

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

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

4. Communication channel consists of:

5.  
The waves that are bent down by the ionosphere are

6. Which is more advantageous?

7.  
The term used “to collect the information about an object and a place without physical contact” is called :

8.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

9. The audio frequencies range from:

10.  
The frequency band used in the downlink of satellite communication is

11. AM is used for broadcasting because:

12.  
The modulation index in amplitude modulation is:

13.  
What is the function of the receiver?

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

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

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

17. Broadcasting antenna are generally:

18. Increase in frequency deviation results into:

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

20. Which of the following is not transducer?