Communication Systems Class 12 MCQs Questions with Answers

1. AM is used for broadcasting because:

2. Increase in frequency deviation results into:

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

4.  
The frequency band used in the downlink of satellite communication is

5. The audio frequencies range from:

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

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

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

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

10. Broadcasting antenna are generally:

11. Communication channel consists of:

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

13.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

14. Which is more advantageous?

15.  
What is the function of the receiver?

16. Which of the following is not transducer?

17.  
The waves that are bent down by the ionosphere are

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

19.  
The modulation index in amplitude modulation is:

20.  
Which of the following is the reason for signal distortion?