Karnataka 1st PUC Model Question Paper for Electronics

SAMPLE PAPER

Karnataka
Board
Model Paper

Model Question Paper

Subject: I PUC Electronics (40)

[Time: 3 Hours] [Total No. of Questions: 45] [Max. Marks: 70]
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.

PART A
I. Select the correct answer from the choices given: 15 x 1 = 15
1. Vacuum tube triode was invented by.
a) Shockley b) Jack Kilby c) J.A. Fleming d) Lee De Forest
2. SI Unit of charge is
a) Ampere b) Coulomb c) Faraday d) Tesla
3. Two equal value resistors each having resistance ‘R’ are connected in parallel, the effective
resistance of the combination is equal to
a) R b) R/2 c) 2R d) 2/R
4. Sphygmomanometer is an instrument used to measure
a) Glucose b) Hemoglobin c) Temperature d) Arterial pressure
5. Identify the active device amongst the following
a) Transistor b) Resistor c) Capacitor d) Inductor
6. The ability of a capacitor to store electrical charges is known as
(a) resistivity (b) resistance (c) conductance (d) capacitance
7. In an RC circuit connected to DC source, voltage across the capacitor increase
a) Linearly b) Exponentially
c) Constantly d) Logarithmically
8. For a series LCR circuit condition for resonance is
a) XL > XC b) XL < XC c) XL = XC d) XL ≠ XC

9. Barrier voltage for Silicon diode is
a) 0.3V b) 0.5V c) 0.6V d) 0.7V
10. A centre tapped full wave rectifier consists of
a) One diode b) Two diodes c) Three diodes d) Four diodes

11. Number of junctions in a transistor is
a) zero b) one c) two d) three
12. A transistor has α = 0.99 then its β is given by
a) 95 b) 98 c) 99 d) 100
13. A group of four bits is called
a) Bit b) Byte c) Word d) Nibble
14. Logic expression for the output of NOR gate is

a) Y = ̅̅̅̅̅
AB b) Y = ̅̅̅̅̅̅̅
A+B c) Y = AB ̅B
d) Y = A ̅

15. Technical specifications document of a component is called
a) Data sheet b) Excel sheet c) Google sheet d) Work sheet

II. Fill in the blanks by choosing appropriate answer from those given in the bracket: 5x1=5
[ a) filter b) frequency c) digital d) chopper e) transistor f) potentiometer ]

16. DC to DC converters are called …………….
17. Number of AC cycles completed in one second is called ……………
18. Example for a variable resistor is …….……
19. The circuit which eliminates ripples is called ……..…
20. A square wave is an example for the …………. signal.

PART B
III. Answer any FIVE questions: 5 x 2 = 10
21. Silicon is more preferred than germanium in semi conductor devices fabrication, justify.
22. Mention any two advantages of digital thermometer.
23. Distinguish between self inductance and mutual inductance.
24. Draw the graph showing growth of current in RL circuit.

25. Mention any two applications of a diode.
26. What are the biasing conditions of a transistor to operate in active region and in cut off region?

̅B = A + B
27. Prove that A + A
28. Mention two important specifications of LED.

PART C

IV. Answer any FIVE questions: 5 x 3 = 15
29. Mention any three properties of charges.
30. How do you create 3 V, 2 V and 1 V from a 3 V source?.

31. Explain the construction of carbon composition resistor.

32. In a series RLC circuit explain variation of impedance with reference to frequencies.

33. What is the reactance of a 3 µH inductor connected to an AC of 230 V, 50 Hz?
34. Write a note on formation of n−type semiconductor.
35. Compare the doping levels and physical sizes of emitter, base and collector layers of a
transistor.
36. State and prove De−Morgan’s Theorems.

PART D (Section I)
V. Answer any THREE questions: 3 x 5 = 15
37. Derive an expression for the effective resistance of two resistors connected in series.
38. Explain the construction and working of loudspeaker.
39. Classify solids based on energy band diagram.
40. Construct a bridge rectifier circuit and explain.
41. Explain working of two input diode AND gate.

PART D (Section II)
VI. Answer any TWO questions: 2 x 5 = 10
42. Using Thevenin’s theorem, find the load current and load voltage for the following
circuit.

43. A transformer has 500 turns in the primary and 250 turns in the secondary. What is
the turn’s ratio? How much is the secondary voltage with a primary voltage of 230 V?
44. For the Zener diode voltage regulator with VS = 20 V, RS = 100 Ω, VZ = 12 V,
RL = 680 Ω. Determine
a. Load voltage
b. Voltage drop across series resistance RS
c. Current through the Zener diode
45. Subtract 11112 from 110012 using 2’s complement method. Also verify the same by
direct subtraction method.

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