Signals and Transmission Systems, Class 12 Physics NCERT Solutions

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. The characteristic impedence of a coaxial wire line is of order

 1000 ohm

 200 ohm

 30 ohm

 80 ohm

Question 1 of 10

2. In which manner does current or voltage vary in an analog signal with time?

 not a fixed pattern

 discontinuously

 sometime continuously and sometime discontinuously

  continuously

Question 2 of 10

3. If an antenna radiates electromagnetic waves from a height h, then the range d upto which the signal can be detected is given by ( R is the radius of the earth)

 d = √2RH

 d = 2Rlh

 d = 2Rl√h

 d = 2Rh

Question 3 of 10

4. Super high frequencies of __________ are used in Radar and Satellite Communication.

 2000 to 25000 MHz

 3000 to 30000 MHz

 1000 to 10000 MHz

 5000 to 30000 MHz

Question 4 of 10

5. The bandwidth sufficient for commercial telephonic communication:

  700 Hz

 2800 Hz

 1400 Hz

 300 Hz

Question 5 of 10

6. Optical communication using fibres is performed in the frequency range of

  few kHz

 54-72 MHz

 1THz to 1000 THz

 30-40 MHz

Question 6 of 10

7. Modes of communication system are classified into :

 Line communication and space communication

 Space communication and Digital communication

  Point to point communication and broadcast communication

 Line communication and analog communication

Question 7 of 10

8. If the area of a TV telecast is to be doubled, then height of transmitting antenna will have to be

  doubled

 halved

 unchanged

 quadrupled

Question 8 of 10

9. With the increase in frequencies more than 2 MHz, Ground wave propagation

 Increases

 Fails

 Does not depend on the frequency of propagation

  None of the above

Question 9 of 10

10. What should be the approximate height of antenna if the TV telecast is to cover a radius of 100 km?

 128 m

 78 m

 781 m

 1280 m

Question 10 of 10

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