Kerala Plus Two Model Question Paper Electronics

SAMPLE
PAPER

Electronics
Higher secondary plus two examination
Time : 2Hrs.
Max.score:60

Answer any 7 questions from 1 to 9. Each carries 1 score.
1. Which filter has its pass band ranging from 0Hz to cut off frequency?
a) LPF b) HPF c) BPF d) BRF
2. The number of select lines required for a 8:1 multiplexer is
a) 2 b) 3 c) 4 d) 1
3. The bandwidth required for a AM signal is
a) fm b) 2fm c) 4fm d) 10fm
4. Which of the following statement is true about ionosphere?
a) critical frequency increases with height
b) critical frequency decreases withheight
c) critical frequency is a constant
d) none of the above
5. Pulse dispersion is minimum in ………. index type of fiber.( step/graded )
6. The aspect ratio in TV is
a) 3:4 b) 4:3 c) 2:3 d) 3:2
7. Which memory is considered as fastest?
a) primary b) secondary c) Cache d) hard disk
8. The failure of any one host computer results in failure of the entire network in
a) bus b) star c) ring d) mesh
9. In cellular communication, which of the following statement is true?
a) same frequency is used for all cells
b) different frequency is used for different cells
c) different frequency is used only for adjacent cells
d) none of the above

Answer any 8 questions from 10 to 20. Each carries 2 score.
10. Write short note on line regulation.
11. Draw the ideal and practical frequency responses of a low pass filter.
12. Write the truth table of a JK flip flop.
13. In an AM carrier frequency is 100KHz and message frequency is 5KHz.
Calculate the LSB and USB frequencies.
14. Write the importance of ionosphere in communication.
15. A message has a frequency range of 300Hz to 3500Hz. Calculate the
minimum sampling rate.
16. Write the need of cladding in optical fiber.
17. Calculate the number of horizontal lines scanned in a TV system in on
second.
18. Identify the input devices and output devices of a computer from the
following list.
( scanner, printer, microphone, speaker )
19. What are the functions of a MODEM?
20. Write the concept of frequency re-use in cellular communication.
Answer any 7 questions from 21 to 29. Each carries 3 score.
21. Draw the circuit diagram of a zener diode regulator. What are its drawback?
22. Draw the circuit, input and output wave forms of a positive clamper.
23. How a JK flip flop can be converted into D and T flip flops?
24. Discuss the difficulties in AM demodulation when modulation index exceeds
unity.
25. Briefly explain the need of quantisation in PCM.
26. How total internal reflection helps in the propagation of light in optical fiber?
27. Describe the need of scanning in TV camera.

28. Compare the characteristics of static RAM and dynamic RAM.
29. What are the advantages of networking in computers?
Write any 4 questions from 30 to 34. Each carries 4 score.
30. Draw the block diagram of DC regulated power supply. Discuss the function
of each block.
31. Draw the circuit of a summing amplifier and show that output is sum of
input voltages.
32. A 400W carrier is AM modulated with index of 60%. Calculate the total power
of AM signal and power in one side band.
33. Optical fiber communication has revolutionised the field of communication.
Discuss any four advantages of optical fiber communication.
34. How 7MHz bandwidth is needed for a TV channel?