WAEC Electronics Or Basic Electronics Questions and Answers 2021 | Theory and OBJ- Download PDF

Filed in WAEC News by on July 25, 2021 0 Comments

WAEC Electronics Or Basic Electronics Questions and Answers 2021 | Theory and OBJ- Download PDF

If you are about to write the West African Senior Certificate Exams (WASSCE), you will realize that you need the WAEC Past Questions and Answers.

WAEC Electronics Or Basic Electronics Questions and Answers 2021

This article provides you with WAEC Electronics Or Basic Electronics Questions and Answers for the WASSCE 2021. It contains information regarding the WAEC Electronics Or Basic Electronics Theory and Objective Questions and Answers.

EXAMINATION SCHEME

There will be three papers, Papers 1, 2 and 3, all of which must be taken. Papers 1 and 2 shall be a composite paper to be taken at one sitting.

PAPER 1:      will consist of fifty multiple-choice objective questions all of which are to be answered in 1 hour for 50 marks.

PAPER 2:      will consist of seven short-structured questions. Candidates will be required to answer any five in 1 hour for 50 marks.

PAPER 3:      will be a practical paper of two experiments both of which are to be carried out by candidates in 3 hours for 100 marks.

WAEC Electronics Or Basic Electronics Objective Questions

PAPER 1 OBJECTIVE

1. The decimal equivalent of the binary number 10002 is A. 12.
B. 11.
C. 9.
D. 8.
2. Modulation is a process in which
A. radio signal travels between two transmitters.
B. telephone subscribers are connected to one other.
C. audio signals are carried over radio waves.
D. audio signals are amplifier.
3. Which of the following electrical appliances operates on the principle of a closed-loop system?
A. Immersion heater
B. Refrigerator
C. Electric fan
D. Electric kettle

Use figure 1 to answer Questions 4 and 5.


C1 = 10 µF

= 20 µF
X Y

C2 = 10 µF
Figure 1

4. The total capacitance between X and Y is A. 10.0 µF.
B. 20.0 µF.
C. 30.0 µF.
D. 40.0 µF.
5. The total capacitance when C3 is removed from the circuit is
A. 2.0 µF.
B. 5.0 µF.
C. 10.0 µF.
D. 20.0 µF.

WAEC Electronics Or Basic Electronics Theory Questions

 ESSAY

1.(a) (i) Draw the circuit diagram of a Colpitts oscillator

(ii) Label any three parts of the figure in 1a(i).

  • Explain the working principle of a Colpitts
  1. (a) (i) With the aid of sketches, distinguish between dynamic and electrostatic transducers.

(ii) State two advantages of electrostatic transducers over dynamic transducers.

  • List two electromechanical

PAPER 3 PRACTICAL

Apparatus

one 12 V d.c. power supply;

one 12 V, 1 A a.c. power supply; one d.c. voltmeter (0 – 12 V); one a.c. voltmeter (0 – 12 V); one d.c. ammeter (0 – 10 A);

one a.c. milliammeter (0 – 100 mA);

one decade resistance box Rb (0 – 200 Ω);

one 40 W choke;

one single-pole switch; one set of handtools; connecting wires.

  1. AIM: To determine the resistance of a

  • Connect the circuit as shown in 1
  • Ask the supervisor to check the circuit
  • Copy Table 1 into your answer

Table 1

Rb(Ω) I(A) VL(V)
0    
10    
20    
30    
40    
50    
60    
70    

 

  • Close switch
  • Read and record in Table 1 the readings on the ammeter A and voltmeter VL.
  • Open switch
  • Increase the resistance value of Rb in steps of 10 Ω.
  • Repeat steps (d) to (g) for up to 70 Ω as shown in Table
  • Plot a graph of voltage VL (V) on the vertical axis against current I (A) on the horizontal

Determine the gradient of the graph.

How to Download WAEC Past Questions and Answers

WAEC Past Questions and Answers are available for download for all subjects in PDF. To download WAEC Past Questions and Answers for Electronics Or Basic Electronics, you only need a phone, a whatsapp account and a Gmail address.

Then call 07063986527 and drop and WhatsApp message.

Click the Link Below to download WAEC Past Questions and Answers for Electronics Or Basic Electronics.

Download WAEC Past Questions and Answers for all Subjects Including practical.

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