ELECTRONICS Obj (Q1-10): Int. Sci. Current WAEC Questions

Integrated Science Current WASSCE Past Questions: Electronics Objective Questions (2012-2019)

I) Questions that occur multiple times means they were repeated over the period under consideration

II) Candidates are expected to spend 50 seconds on each objective question. Candidates are therefore required to spend between 8-9minutes on these 10 questions. Start work now!!

1. One of the reasons for using a capacitor in an electric circuit is to
A. Amplify electronic signals
B. Cut off the current flowing from the emitter
C. Emit incoherent narrow spectrum light
D. Differentiate between high frequency and low frequency signals

2. An electronic device which allows an electric current to flow in one direction and blocks it in an opposite direction is called
A. Capacitor
B. Diode
C. Inductive
D. Transistor

3. When an n-p-n transistor is used as a simple amplifier, the base emitter junction is
I. Forward biased
II. Reverse biased
III. Neutral
Which of the following statements is/are correct?
A. I only
B. II only
C. III only
D. I and III only

See also: Forms of Energy Obj (Q1-10): Int. Sci. Current WAEC Questions

Use the diagram below to answer questions 4 and 5

4. The part labelled I is
A. Base
B. Collector
C. Emitter
D. Resistor

5. The function of the part labelled II is to supply
A. Protons
B. Voltages
C. Negative charges
D. Positive charges

See also: Laboratory Apparatus Obj & Practical. (3 Obj & 1 Pract. An.): Int. Sci. Current WAEC Questions

6. Which of the following statements about a forward-based p-n junction diode is/are correct? The
I. p-type semi-conductor is connected to the positive terminal of a cell
II. p-type semi-conductor is connected to the negative terminal of a cell
III. n-type semi-conductor is connected to the negative terminal of a cell
A. I only
B. II only
C. I and III only
D. II and III only

7. A transistor can be used as
I. Switch
II. Rectifier
III. Amplifier
A. I only
B. I and III only
C. II and III only
D. I, II and III

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8. A light emitting diode was connected in a series with a capacitor and a d.c source.
What observation would be made when circuit is closed? The diode
A. Does not light
B. Lights and goes off
C. Lights and stay on
D. Blows off

9. The charge carriers in a semi-conductor are
A. Holes only
B. Protons only
C. Holes and protons
D. Holes and neutrons

10. Introduction of trivalent element into a tetravalent element
I. is known as doping
II. Forms n-type semi-conductor
III. Forms a p-type semi-conductor
Which of the statements above are correct?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III only

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Answers
1. D
2. D
3. A
4. C
5. C

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6. C
7. D
8. C
9. C
10. B

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