Kerala Plus One Question Paper 2023 Electronics

FIRST YEAR

Kerala Board
Question Paper
2023

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Reg. No. : ......................................
Name : ...........................................
FY-431
FIRST 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  ‘  ’ .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

FY-431 1 P.T.O.

Answer all questions from 1 to 9. Each carries 1 score. (9  1 = 9)

1. Unit of resistance is ________.

2. The cut in voltage (knee voltage) of a silicon diode is ________.

3. ________ is the unit of current.

4. The forbidden energy gap of Germanium is __________.

5. Draw the symbol of a NPN transistor.

6. The efficiency of a half wave rectifier is __________.

7. Write the expression for frequency of oscillation of a tank (LC) circuit.

8. The base of a binary number system is _________.

9. A galvanometer can be converted into a voltmeter by connecting __________.

Answer any 7 questions from 10 to 20. Each carries 2 scores. (7  2 = 14)

10. A resistor has colour band sequence Red, Red, Yellow, Gold. What is its resistance
value ?

FY-431 2

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

(9  1 = 9)
1.   _________ .

2.       _________.

3.   _________.

4.     _________ .

5.  NPN   .

6.      _________ .

7.   (LC)    
.

8.     _________ .

9.  ,   .  
_________   .

10  20    7  .
2  . (7  2 = 14)

10.     , , , .
     ?

FY-431 3 P.T.O.

11. State Ohm’s law.

12. Conductivity of extrinsic semiconductor is more than that of intrinsic semiconductor.
Explain.

13. Zener diodes are designed to operate in the breakdown region without damage. Draw
the symbol and write the use of a Zener diode.

14. Write the relation between alpha () and beta ().

15. Draw and explain the structure of a Silicon Controlled Rectifier (SCR).

16. Operational amplifiers are the basic building blocks of analog electronic circuit. Draw
the circuit diagram of an inverting amplifier using Op-amp.

17. State the Barkhausen criterion for sustained oscillation.

18. Convert the binary number (1111)2 into its corresponding decimal number.

19. Draw the circuit of a half wave rectifier.

20. Draw the circuit arrangement to convert a galvanometer into ammeter.

FY-431 4

11.   .

12.    
 . .

13.     
  .    
   .

14.  ()  ()   .

15.     .

16.      
 . Op-amp  
  .

17.     
.

18. (1111)2       .

19.       .

20.       .

FY-431 5 P.T.O.

Answer any 7 questions from 21 to 29. Each carries 3 scores. (7  3 = 21)

21. A capacitor can store electrical energy in its electric field.

(a) Write the equation for the capacitance of a capacitor. (1)

(b) Mention the factors affecting the capacitance of a capacitor. (2)

22. An electrical signal can be represented as v = Vm sin 2ft. Explain the following terms :

(a) Cycle (1)

(b) Time period (1)

(c) Frequency (1)

23. Classify solids based on energy band diagrams.

24. Draw the V-I characteristics of a P-N junction diode.

25. Compare the emitter, base & collector regions of a transistor.

26. Ripple factor is a measure of the purity of the DC output of a rectifier.

(a) Write the general expression for ripple factor. (2)

(b) Ripple factor of a full wave rectifier is ________. (1)

FY-431 6

21  29    7  .
3  . (7  3 = 21)

21.        
.

(a)   . (1)

(b)      . (2)

22.    v = Vm sin 2ft  . 
 .

(a)  (1)

(b)   (1)

(c)  (1)

23.       
.

24.  P-N      .

25.   , ,    .

26.   DC     
.

(a)    . (2)

(b)       _________ . (1)
FY-431 7 P.T.O.

27. Compare Field Effect Transistor (FET) & Bipolar Junction Transistor (BJT).

28. Voltage divider biasing is the most widely used amplifier biasing circuit. Draw the

circuit diagram of a voltage divider biasing.

29. Draw the symbol and truth table of a logic AND gate.

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

30. Draw the input and output characteristics of a transistor in common emitter

configuration.

31. A rectifier converts AC to DC. Draw the circuit and input output waveforms of any full

wave rectifier.

32. With the help of a neat circuit diagram explain the working of a RC coupled amplifier.

33. (a) Draw the circuit diagram of a RC phase shift oscillator. (3)

(b) Write the equation for frequency of oscillation of RC phase shift oscillator. (1)

FY-431 8

27.    (FET)  
  .

28.      
 .     .

29. AND     .

30  34    4  .

4  . (4  4 = 16)

30.        
  .

31. AC  DC   .    

 , ,   .

32.  RC      .

33. (a)  RC     . (3)

(b)  RC       
 . (1)

FY-431 9 P.T.O.

34. (a) Draw the symbol of a logic OR gate. (1)

(b) Write the output equation of logic OR gate. (1)

(c) Write the truth table of an OR gate. (2)

____________

FY-431 10

34. (a)  ‘’   . (1)

(b)       . (1)

(c) OR    . (2)

____________

FY-431 11 P.T.O.

FY-431 12