Karnataka 2nd PUC Model Question Paper 2026 for Electronics

SAMPLE PAPER

Karnataka
Board
Model Paper

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GOVERNEMENT OF KARNATAKA
KARNATAKA SCHOOL EXAMINATION AND ASSEMENT BOARD
6th CROSS, MALLESHWARAM, BENGALURU-560 003
2025-26 II PUC MODEL QUESTION PAPER- 1
Subject: 40 – ELECTRONICS Maximum Marks: 70
Time: 3.00 Hours No. of Questions: 45
Instructions:

1. For PART-A questions, only the first written answers will be considered for evaluation.

2. Part – D consists of two sections.
Section - I is of essay type questions and Section - II is of problems.
3. Circuit diagram and truth tables must be drawn wherever necessary.

4. Solve the problems with necessary formulae.

5. For questions having diagrams, alternate questions are given at the end of the question paper in separate
section for visually challenged students.
PART A

I. Select the correct answer from the choices given: 15 x 1 = 15

1. Name a unipolar device.
a) Diode b) BJT c) FET d) TRIAC
2. For faithful amplification the operating point is chosen at the
a) Centre of the active region b) Cut off region
c) Saturation region d) Inversion region
3. What is the phase difference between input and output of a transistor CB amplifier?
a) 00 b) 600 c) 900 d) 1800
4. What happens to the input impedance of an amplifier when voltage series negative
feedback is applied?
a) Remains same b) Increases
c) Decreases d) Oscillates
5. Voltage gain of an ideal Op-amp is
a) 0 b) ∞ c) 106 d) 1000
6. Zero crossing detector is an application of
a) Subtractor b) Adder
c) Comparator d) Inverting amplifier
7. Mention the high frequency stability oscillator
a) Crystal oscillator b) Hartley oscillator
c) Wein bridge oscillator d) Colpitts oscillator

2025-26 II PU ELECTRONICS (40) MODEL QUESTION PAPER FROM KSEAB Page 1 of 4

8. Name the layer of Ionosphere.
a) D layer b) E layer c) F layer d) All of these
9. How many sidebands are present in AM?
a) 1 b) 2 c) 3 d) ∞
10. A SCR has
a) Two junctions and three layers b) Three junctions and three layers
c) Three junctions and four layers d) Four junctions and three layers
11. Logic expression for the output of XOR gate is
̅̅̅̅̅
a) Y = A B b) Y = ̅̅̅̅̅̅̅
A+B ̅ B + AB
c) Y = A ̅ ̅B
d) Y = A ̅ + AB
12. The logical AND term is called
a) Sum term b) Product term c) Sum of Product d) Product of sum
13. How many timers are present in 8051 microcontroller?
a) 1 b) 2 c) 3 d) 4
14. Size of an integer in C programming is
a) 1 byte b) 2 byte c) 4 byte d) 8 byte
15. Shapes of cells in mobile network operation system is
a) Octagonal b) Circular c) Oval d) Hexagonal

II. Fill in the blanks by choosing appropriate answer from those given in the bracket: 5x1=5

[ a) data b) modulation c) slew rate d) feedback e) impedance f) damped]

16. CC amplifier is used to match …………

17. The rate of change of output voltage of op-amp is called …………

18. Electrical oscillations whose amplitude decreases with time are known as …………… oscillations.

19. Process of changing some characteristics of carrier in accordance with instantaneous value of the
modulating signal is called ………

20. Flip-Flops are used to store ………...

PART B

III. Answer any FIVE questions: 5 x 2 = 10

21. What is the need for transistor biasing?
22. An amplifier with Zi = 1 k  has a voltage gain A = 1000. If a negative feedback of β = 0.01 is applied
to it. Calculate the input impedance of the feedback amplifier.
23. A Hartley oscillator having Leq = 1 µH and C = 5 pF. Determine frequency of oscillations.

24. Name any two types of modulation.
25. Mention any four power devices.

2025-26 II PU ELECTRONICS (40) MODEL QUESTION PAPER FROM KSEAB Page 2 of 4

26. Write minterm designation table for three input variables.
27. Give any two comparisons between Microprocessor and Microcontroller.

28. Mention any two advantages of digital cell phone system.

PART C
IV. Answer any FIVE questions: 5 x 3 = 15

29. What are drain characteristics? Obtain a relation between FET parameters.

30. Define the terms open loop gain, closed loop gain and feedback fraction.
31. Draw the circuit diagram of phase shift oscillator. Write the expression for its frequency of
oscillations.

32. Define Critical angle, Critical frequency and Skip distance.

33. Sketch the carrier, modulating signal and AM wave when (a) ma = 0.5 (b) ma = 1 and
(a) ma = 1.5
34. Determine Vdc and Idc of SCR HWR. Given firing angle is 300 and rms voltage of ac input to the
rectifier is 230 V and load is 10 Ω.

35. Convert (1101)2 into gray code using XOR gates.

36. Explain briefly satellite communication system.

PART D (Section I)
V. Answer any THREE questions: 3 x 5 = 15
37. Explain the working of CC amplifier.
38. Obtain an expression for the output of op-amp integrator.
39. Draw the pin diagram of IC 7400. Realize NOT, AND, OR and XOR gates using NAND gates.
40. Write ALP program to divide EDH by 1EH. In which registers quotient and remainders are stored?
41. Write a C program to accept two integer numbers and print whether they are equal or not equal.

PART D (Section II)
VI. Answer any TWO questions: 2 x 5 = 10

42. CE amplifier circuit using silicon transistor is shown in
figure.

Calculate i) V2, ii) Av, iii) Ai, iv ) AP .
Given  =100, VBE = 0.7 V
26𝑚𝑉
and re’ = 𝐼𝐸

2025-26 II PU ELECTRONICS (40) MODEL QUESTION PAPER FROM KSEAB Page 3 of 4

43. Find the output voltage for the op-amp circuits given below.

(3+2)
44. A modulating signal 10sin(2πx103t) is used to amplitude modulate a carrier signal
20sin(2πx106 t). Find the (a) modulation index (b) percentage modulation
(c) frequencies of the sideband components and their amplitude (d) bandwidth of the modulated signal.
45. Simplify the Boolean expression, Y = ∑m (0, 1, 4, 13, 15) + ∑d (2, 5, 7) and then draw the logic
diagram for the simplified expression using basic gates.
PART-E
(For visually challenged students only)
42. In a single stage CE transistor amplifier R1 = 45 kΩ, R2 = 5 kΩ, RC = 10 kΩ, RE = 1 kΩ, VCC = 20 V,
26𝑚𝑉
 =100, VBE = 0.7 V and re’ = 𝐼𝐸

Calculate i) V2, ii) Av, iii) Ai, iv ) AP .

43. (a) An op-amp subtractor circuit is given with R1 = 1 kΩ, R2 = 1 kΩ, R3 = 5 kΩ, Rf = 5 kΩ, V1 =
1 V, V2 = 2V. Determine the output voltage V01. 3
(b) An op-amp inverting amplifier circuit is given with Ri = 5 kΩ, Rf = 12 kΩ, Vin = 3 V Determine
the output voltage V02. 2
******

2025-26 II PU ELECTRONICS (40) MODEL QUESTION PAPER FROM KSEAB Page 4 of 4

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