Karnataka 1st PUC Model Question Paper 2022 for Electronics

I PUC- ELECTRONICS (40)
MODEL QUESTION PAPER

Time: 3hour 15 min Max. Marks: 70
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PART A
Answer any TEN questions: 1 x 10 = 10

1. What is internet ?
2. Define frequency.
3. When will a load receives maximum power from a source?
4. What is a multimeter?
5. Define resistance.
6. What is a microphone?
7. Define time constant during the discharge of capacitor through a resistance.
8. What are clippers?
9. What happens to the width of depletion layer of a p-n junction when it is reverse biased?
10. Name any one application of LED.
11. Draw the symbol of N-P-N transistor..
12. What does the arrow in the circuit symbol of a transistor indicate?
13. Expand MSB.
14. Write 1’s complement of the binary number 1011.
15. What is a part number?
PART B
Answer any FIVE questions: 2 x 5 = 10
16. List any two household electronic equipments/appliances.
17. What will be the resistance of open and short circuit?
18. Mention any two limitations of Ohm’s law.
19. Write the symbol of AC ammeter and DC voltmeter.
20. With appropriate diagram, write the expression for three inductors connected in series.
21. What are the factors upon which the time constant of R-L circuit depends?
22. How many diodes are used in a (i) Full wave centre tapped rectifier and
(ii) Bridge rectifier.
23. Define transistor (BJT) and Write its current relation. .
24. Draw the symbol of AND gate. Write its output logical expression.
25. What are fixed regulators ? Name any one IC fixed regulator.

PART C

Answer any FIVE questions: 3 x 5 = 15
26. Write any three application of electronics in the field of communication.
27. Explain voltage divider rule.

28. Find the electric current, electric power and electric energy at 2 seconds if the supply
voltage is 12V and resistance is 10Ω.
29. Mention any three bio-medical electronic devices.
30. With a labelled diagram explain the construction of fixed type wire wound resistor.
31. A 10 KVA (i.e. 10KW) 2200/220 single phase transformer has 60 turns on secondary.
Find:
(i) Number of turns on primary coil
(ii) Primary current and
(iii) secondary currents
32. What is low pass filter? Draw the circuit diagram and frequency response curve of RC
low pass filter.
33. Briefly explain the formation of N-type semiconductor.
34. Define 𝛼 of a transistor. Derive an expression for β in terms of α .
35. Write any three advantages of PCB.
PART D
I. Answer any THREE questions: 5 x 3 = 15

36.Using Kirchhoff’s laws find the current through each resistance of the network shown.

37. Complete the following table for the carbon resistor R.
Sl.No. Band-I Band-II Band-III Band-IV Value of R
1 Brown Black Brown Gold
2 Red Red Red Silver
3 100KΩ; ± 10%
4 1Ω; ±5%
5 Blue Gray Orange No colour

38. An inductor of 10 H in series with a resistor of 20 Ω is connected to an 80 V dc supply.
Calculate

(a) Time constant of the circuit
(b) Find steady state value of current
(c) Current at time 1 second after the dc supply is connected

39. For the zener diode circuit shown below. Determine:
(i)Output voltage (ii) Voltage drop across series resistor (iii) Load current (iv) Current
through𝑅 and (V) current through zener diode.

40. Subtract (10) from (15) in binary using 2’s complement method.

41 In a bridge rectifier, the applied AC voltage is 50 V( Peak) and load resistance is 100 Ω.
Calculate Vdc, Vrms and efficiency.

II. Answer any FOUR questions: 5 x 4 = 20
42. Mention any five properties of electrical charge.
43. With a labeled diagram explain the construction and working of a moving coil
loudspeaker.
44. With the help of circuit diagram derive an expression for the equivalent capacitance of
three capacitors connected in series.
45. With a circuit diagram and phasor diagram derive an expression for impedance in a series
R-L-C circuit.
46. On the basis of electrical conductivity, classify the solids. Explain their behaviour using
energy band phenomenon.
47. With a circuit diagram, indicating the input and output waveforms, explain the working of
half wave rectifier.
48. Define the following terms: (i) Bit (ii) Nibble (iii)Byte (iv) Radix (v) Logic gate
49. State and prove De Morgan’s theorems.

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Blue Print for Model Question Paper 2022

I PUC ELECTRONICS (40)

Sl. Name of the Knowledge Understanding Application/ Total
no chapter (30%) (40%) skill (30%)
1 2 3 5 1 2 3 5 1 2 3 5
1 Introduction to 06
electronics 1 1 1

2 Principles of 1 22
1 1 1 1 1 1 1
electricity
3 Measuring 06
1 1 1
instruments
4 Passive 1 25
components 1 1 1 1 1 1 1

5 AC and DC 1 16
applied to
passive 1 1 1 1
components

6 Semiconductor 2 28
theory, PN
junction diode
1 1 1 1 2 1
and its
application

7 Bipolar junction 07
transistor 1 1 1 1

8 Digital 1 19
electronics 1 1 1 1 1

9 Practical 06
components 1 1 1

Total 45 53 37 135