Communication Systems Class 12 MCQs Questions with Answers

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

2.  
The frequency band used in the downlink of satellite communication is

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

4. Communication channel consists of:

5. Which is more advantageous?

6. Increase in frequency deviation results into:

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

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

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

10. AM is used for broadcasting because:

11.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

12.  
What is the function of the receiver?

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

14. The audio frequencies range from:

15. Which of the following is not transducer?

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

17.  
The term used “to collect the information about an object and a place without physical contact” is called :

18.  
The modulation index in amplitude modulation is:

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

20. Broadcasting antenna are generally: