Kerala Plus Two Question Paper 2023 Electronics

SECOND YEAR

Kerala Board
Question Paper
2023

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SY-531
SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH 2023

Part – III Time : 2 Hours
ELECTRONICS Cool-off time : 15 Minutes
Maximum : 60 Scores

General Instructions to Candidates :
 There is a ‘Cool-off time’ of 15 minutes in addition to the writing time.
 Use the ‘Cool-off time’ to get familiar with questions and to plan your answers.
 Read questions carefully before answering.
 Read the instructions carefully.
 Calculations, figures and graphs should be shown in the answer sheet itself.
 Malayalam version of the questions is also provided.
 Give equations wherever necessary.
 Electronic devices except non-programmable calculators are not allowed in the
Examination Hall.

 
    15  ‘  ’ .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

SY-531 1 P.T.O.

Answer all questions from 1 to 9. Each carries 1 score. (9  1 = 9)
1. A positive clipper clipps ________ half cycle of an input wave.
(Positive, Negative, Both, None)

2. If both inputs of JK flip flop is connected together, it will become a ________ flip flop.
(T flip flop, D Flip flop, S-R flip flop, None of the above)

3. If Vm is the amplitude of message signal and Vc is that of carrier. Their modulation
index is given by m = ________

4. What is the unit of frequency ?

5. Write the name of any electronic device which is used for receiving optical signal.

6. Standard aspect ratio of a TV system is ________.

7. 1 GB = ________ MB.

8. Write the full form of HTTP.

9. How many satellites are used for GPS system ?
(21, 3, 12, 8)

Answer any 7 questions from 10 to 20. Each carries 2 scores. (7  2 = 14)
10. Draw the connection diagram of an IC voltage regulator to get an output of +12 V DC
output.

11. Draw the circuit diagram and output wave form of a –ve clamper.

12. Draw the circuit diagram of S-R Flip Flop.

SY-531 2

1  9    . 1  .
(9  1 = 9)

1.      ________   

(, , ,  )

2. JK        ________
  .
(T  , D  , S-R  ,  )

3. Vm     Vc  
  m = ________

4.    ?

5.      2
  .

6. TV     ________ .

7. 1 GB = ________ MB.

8. HTTP   .

9. GPS      ?
(21, 3, 12, 8)

10  20    7  .
2  . (7  2 = 14)
10. +12  DC    IC   
 .

11.         .

12. S-R     .

SY-531 3 P.T.O.

13. What is the need for modulation in communication ? Write any two points.

14. Match the following :
3 – 30 MHz – Medium Frequency (MF)
300 – 3000 KHZ – Super High Frequency (SHF)
3 – 30 GHZ – Very High Frequency (VHF)
30 – 300 MHZ – High Frequency (HF)

15. What do you mean by quantization in digital modulation technique (PCM) ?

16. Write any two advantages of optical fiber communication.

17. Explain how interlaced scanning is useful for avoiding fluttering in TV ?

18. Draw the Block diagram of Basic Computer System.

19. Write any two advantages of Computer Networking.

20. What do you mean by frequency Re-use in cell phone communication ?

Answer any 7 questions from 21 to 29. Each carries 3 scores. (7  3 = 21)
21. Draw the block diagram of regulated power supply.

22. (a) Draw the circuit diagram of a differentiator. (2)
(b) What will be its output when the input is a square wave ? (1)

23. Draw the logic circuit diagram of one bit comparator.

24. (a) Draw the block diagram of AM Demodulator. (2)
(b) Explain its working. (1)
SY-531 4

13.     ?  2 
.

14.   :
3 – 30 MHz –   (MF)
300 – 3000 KHZ –    (SHF)
3 – 30 GHZ –    (VHF)
30 – 300 MHZ –   (HF)

15. PCM      
  ?

16.     2  .

17.    TV   
  .

18.      .

19.     2  .

20.        
 ?

21  29    7  .
3  . (7  3 = 21)
21.      .

22. (a)    . (2)
(b)          ? (1)

23. 1      .

24. (a) AM    . (2)
(b)   . (1)
SY-531 5 P.T.O.

25. Explain the process of Time Division Multiplexing (TDM).

26. Draw the structure of a typical optical fiber.

27. Draw the frequency spectrum of a TV signal.

28. Arrange the following devices into input, output and memory units.

(Mouse, Printer, CD, Monitor, Keyboard, Pendrive)

29. Explain the below given computer topologies with the help of relevant figure.

(a) Ring Topology (1½)

(b) Star Topology (1½)

Answer any 4 questions from 30 to 34. Each carries 4 scores. (4  4 = 16)

30. Draw the circuit diagram of Zener diode voltage regulator and explain its working.

31. (a) Draw the circuit diagram of a summing amplifier. (3)

(b) Give the equation for the output of the above circuit. (1)

32. Draw the block diagram of Super heterodyne receiver.

33. (a) What do you mean by dispersions in optical fiber communication ? (2)

(b) What will be the overall effect of dispersion in an optical fiber ? (2)

34. Draw thee block diagram of Monochrome TV receiver.

____________

SY-531 6

25.    (TDM)  .

26.     .

27. TV    .

28.    ,  ,  
.
(, , CD, , ,  )

29.      
.
(a)   (1½)
(b)   (1½)

30  34    4  .
4  . (4  4 = 16)
30.        
.

31. (a)     . (3)
(b)      . (1)

32.      .

33. (a)      
 ? (2)
(b)     
 ? (2)

34.  TV    .

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SY-531 7 P.T.O.

SY-531 8