Communication Systems Class 12 MCQs Questions with Answers

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

2.  
Which of the following is the reason for signal distortion?

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

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

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

6.  
The modulation index in amplitude modulation is:

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

8. Which of the following is not transducer?

9. Which is more advantageous?

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

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

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

13.  
What is the function of the receiver?

14. The audio frequencies range from:

15. Communication channel consists of:

16. AM is used for broadcasting because:

17. Increase in frequency deviation results into:

18.  
The term used “to collect the information about an object and a place without physical contact” is called :

19.  
Wave obtained on superimposition of audible frequency e.m. wave is known as

20. Broadcasting antenna are generally: