Kerala Plus One Question Paper 2024 Electronics

Kerala Board

Question Paper
2024

Reg. No. : ......................................
FY-431 Name : ...........................................

FIRST YEAR HIGHER SECONDARY EXAMINATION, MARCH – 2024

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.

Write all questions from 1 to 10. Each carries 1 score. (10  1 = 10)

1. When the area of the plate increases, the capacitance of a capacitor _______.

(increases / decreases)

2. The effective resistance when two 100  resistors are connected in series is

(a) 100  (b) 200 

(c) 50  (d) 10 

3. The bandgap energy of a conductor is

(a) 1 eV (b) 5 eV

(c) 0 eV (d) 10 eV

4. The depletion region of a PN junction _______ (increases / decreases) when reverse
biased.

5. Which of the following device has 2 PN junctions ?

(a) Diode (b) Transistor

(c) LED (d) SCR

6. The efficiency of a full wave rectifier is

(a) 50% (b) 100%

(c) 81% (d) 40%

FY-431 2

1  10    . 1  .

(10  1 = 10)

1.      
_______.

( / )

2.  100       
 ________ .

(a) 100  (b) 200 

(c) 50  (d) 10 

3.    ________ .

(a) 1 eV (b) 5 eV

(c) 0 eV (d) 10 eV

4.    PN    _______ ( /
).

5.   PN   ?

(a)  (b) 

(c) LED (d) SCR

6.      _______ .

(a) 50% (b) 100%

(c) 81% (d) 40%

FY-431 3 P.T.O.

7. In an amplifier, bypass capacitor is used in _______.

(a) base (b) emitter

(c) collector (d) output

8. According to Barkhausen condition for oscillation, angle of A should be

(a) 360° (b) 180°

(c) 90° (d) 45°

9. The decimal value of (1101)2 is

10. A galvanometer can be converted into voltmeter by connecting a _______ in series.

Answer any 6 questions from 11 to 19. Each carries 2 scores. (6  2 = 12)

11. Write the equation for capacitance of a parallel plate capacitor. What is each term in it ?

12. Find the effective resistance when three 15  resistors are connected in parallel.

13. Draw the forward and reverse characteristics of a zener diode.

14. Why CE configuration is used in amplifiers ?

15. How the material and colour of the LED are related ?

FY-431 4

7.      _______ .
(a)  (b) 
(c)  (d) 

8.      A  
 ?
(a) 360° (b) 180°
(c) 90° (d) 45°

9. (1101)2     ?

10.     _______ 
.

11  19    6  .
2  . (6  2 = 12)

11.       .
    .

12.  15      
 .

13.       .

14.  CE    ?

15. LED     
  ?

FY-431 5 P.T.O.

16. (a) What you mean by ripple factor ? (1)

(b) What is the ripple factor of a full wave rectifier ? (1)

17. Draw the circuit of an inverting amplifier.

18. Write the difference between positive and negative feedback.

19. Convert the decimal number 25 into binary.

Write any 6 questions from 20 to 27. Each carries 3 scores. (6  3 = 18)

20. Find the value of a resistor with colour code Orange, Red, Brown.

21. Find the voltage across 4  resistor.

22. Draw the energy band diagram of conductor, insulator and semiconductor.

23. Compare Emitter, Base and Collector based on doping rate and size.

FY-431 6

16. (a)      ? (1)

(b)        ? (1)

17.     .

18.       .

19. 25      .

20  27    6  .
3  . (6  3 = 18)

20. , ,      
.

21. 4     .

22. , ,     
.

23.  ,    , , 
  .

FY-431 7 P.T.O.

24. Why photo transistor is more sensitive to light than photodiode ?

25. Why coupling capacitor is used to give input signal to an amplifier ?

26. How a LC tank circuit selects a particular frequency in oscillators ?

27. Write the truth table of a NAND gate.

Write any 5 questions from 28 to 33. Each carries 4 scores. (5  4 = 20)

28. (a) Derive the relation between  and . (2)

(b) For a transistor,  = 0 . 9. Find its . (2)

29. Write the differences between BJT and FET.

30. Draw the circuit of a centre tap full wave rectifier and briefly explain its working.

31. Draw the circuit of a single stage RC coupled amplifier.

FY-431 8

24.      
     ?

25.       
  ?

26.  LC      
 ?

27.  NAND    .

28  33    5  .
4  . (5  4 = 20)

28. (a) ,     . (2)

(b)    = 0 . 9    . (2)

29. BJT, FET    .

30.          
 .

31.   RC    .

FY-431 9 P.T.O.

32. An oscillator can produce sustained oscillations only if Barkhausen conditions are

achieved. Explain.

33. (a) Convert the binary number (101.11)2 into decimal. (3)

(b) Write an application of XOR gate. (1)

____________

FY-431 10

32.      

  . .

33. (a) (101.11)2      . (3)

(b) XOR    . (1)

____________

FY-431 11 P.T.O.

FY-431 12