Kerala Plus One Model Question Paper Electronics

SAMPLE
PAPER

FIRST YEAR HIGHER SECONDARY SAMPLE QUESTION PAPER

Part – III Time : 2 Hours
ELECTRONICS Cool-off time : 20 Minutes
Maximum : 60 Scores

Answer all questions from 1 to 9. Each carries 1 Score. (9 X 1 = 9)

1. Draw the symbol of a resistor.

2. Give the equation of ‘Power’ in terms of current and voltage.

3. Draw the symbol of a Zener diode.

4. Which layer of the transistor is heavily doped ?

5. Write the equation of current amplification factor or current gain in CE configuration of
a transistor.

6. What is the efficiency of a full wave rectifier ?

7. An RC oscillator is suitable for frequency of oscillation.

8. The base of a binary number system is .

9. Which electronics device gives the visual representation of signal waveforms

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

10. Give any two applications of electronics in Medical field.

11. (a) Define voltage. (1)

(b) Which instrument is used for measuring voltage ? (1)

12. Explain the terms valence band and conduction band.
13. The depletion layer width increases in a reverse biased PN junction. Justify this statement.

14. Draw the table of biasing a transistor’s EB junction and CB junction, when active,
saturation and cut-off modes of operation.

15. AC voltage can be converted in to DC by means of rectifier circuits. Draw the circuit
diagram of a half wave rectifier.

16. Draw the constructional diagram of an N-P-N transistor.

17. Explain your idea about the biasing of an amplifier.

18. What are the conditions of Barkhausen criterion for oscillation ?

19. Convert the binary number (10110)2 to a decimal number.

20. When a …………….(Small / Large) resistance is connected in …………..(Parallel / Series)
with a Galvanometer it will become an Ammeter.

Answer any 7 questions from 21 to 29. Each carries 3 Scores. (7 X 3 = 15)

21. (a) Draw the symbol of a capacitor. (1)

(b) What are the factors affecting the capacitance of a capacitor ? (2)

22. Define the terms frequency, time period and phase of a sine wave with suitable
diagram.

23. Draw the energy band diagram of insulator, semi-conductor and conductor.

24. What happened, when a P-N junction is forward biased, explain with
diagram.

25. Explain the below terms related to transistor :
(a) Emitter (1)

(b) Base (1)

(c) Collector (1)

26. Draw the symbol and explain the working of LDR [Light Dependent
Resistor].

27. (a) Draw the diagram of a center tap rectifier. (2)
(b) The Peak Inverse Voltage (PIV) of a center tap rectifier is . (1)

28. (a) What are the disadvantages of a fixed biasing of transistor (2)
amplifier ?
(b) Which biasing is more suitable for a transistor as an amplifier ? (1)

29. Convert the below binary fractional number to a decimal number
(101.1101)2.

Answer any 4 questions from 30 to 34. Each carries 4 Scores each. (4X 4 = 20)

30. (a) Draw the diagram of a CE configuration of N-P-N transistor. (2)

(b) Derive an equation that showing the relationship between the terms α and β
(Alpha and Beta). (2)

31. (a) Draw the circuit diagram of a full wave bridge rectifier. (2)

(b) Draw the input and output waveforms of a bridge rectifier. (2)

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

33. (a) Draw the circuit diagram of RC phase shift oscillator. (2)

(b) How the oscillators are produced in RC phase shift oscillator ? (2)

34. (a) Draw the logic symbol and truth table of NOR gate. (2)

(b)Which gates are called universal gates ? (2)