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Basic Electronics 2 (Essay): 1hr — Wednesday, 12th November, 2025, 13:00 hrs – 14:00 hrs
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Basic Electronics 1 (Objective): 1hr — Wednesday, 12th November, 2025, 14:00 hrs – 15:00 hrs
This article provides candidates with practice questions and answers for WAEC GCE Basic Electronics Obj & Essay 2025/2026. These questions are meant to guide preparation, improve understanding of the subject, and give an idea of what to expect in the examination.
About WAEC GCE Basic Electronics
Basic Electronics is an important subject in the WAEC GCE Nov/Dec examination. It introduces candidates to electrical and electronic principles, covering topics such as:
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Ohm’s Law and circuit analysis
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Resistors, capacitors, and inductors
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Diodes and transistors
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Rectifiers and power supplies
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Digital electronics (logic gates)
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Measuring instruments
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Applications of electronics in everyday life
A good understanding of these areas will help candidates excel in both the Objective and Essay papers.
WAEC GCE Basic Electronics Objective (20 Practice Questions and Answers)
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The SI unit of resistance is:
A. Watt
B. Ohm
C. Ampere
D. Volt
Answer: B -
Which component stores energy in an electric field?
A. Inductor
B. Capacitor
C. Diode
D. Resistor
Answer: B -
A device that changes alternating current (AC) to direct current (DC) is a:
A. Transformer
B. Rectifier
C. Amplifier
D. Rheostat
Answer: B -
If a current of 3A flows through a 4Ω resistor, the voltage across it is:
A. 7V
B. 8V
C. 10V
D. 12V
Answer: D (V = IR = 3 × 4 = 12V) -
The material most used for transistor construction is:
A. Copper
B. Silicon
C. Aluminium
D. Iron
Answer: B -
Which of the following is NOT an insulator?
A. Rubber
B. Glass
C. Copper
D. Plastic
Answer: C -
A NOT gate produces an output that is:
A. The same as input
B. Opposite of input
C. Always 0
D. Always 1
Answer: B -
A multimeter cannot measure:
A. Resistance
B. Frequency
C. Current
D. Voltage
Answer: B -
The frequency of the Nigerian power supply is:
A. 40 Hz
B. 50 Hz
C. 60 Hz
D. 120 Hz
Answer: B -
Which of the following protects electrical circuits?
A. Fuse
B. Transistor
C. Capacitor
D. Diode
Answer: A -
A half-wave rectifier uses how many diodes?
A. 1
B. 2
C. 4
D. 6
Answer: A -
The unit of capacitance is:
A. Henry
B. Farad
C. Volt
D. Ohm
Answer: B -
In a series circuit, the current is:
A. The same at all points
B. Divided equally
C. Zero
D. Doubled
Answer: A -
The depletion region is associated with:
A. Resistors
B. Diodes
C. Transformers
D. Inductors
Answer: B -
Which type of bias allows current to flow in a diode?
A. Forward bias
B. Reverse bias
C. Neutral bias
D. No bias
Answer: A -
A 9V battery is connected across a 3Ω resistor. The current is:
A. 1A
B. 2A
C. 3A
D. 4A
Answer: C -
Which logic gate gives a HIGH output when at least one input is HIGH?
A. AND
B. OR
C. NOT
D. NAND
Answer: B -
A device used to display waveforms is called:
A. Oscilloscope
B. Multimeter
C. Rheostat
D. Galvanometer
Answer: A -
The unit of electric charge is:
A. Coulomb
B. Ampere
C. Watt
D. Joule
Answer: A -
Which of the following is a variable resistor?
A. Thermistor
B. Rheostat
C. Diode
D. Fuse
Answer: B
WAEC GCE Basic Electronics Essay Questions (10 Practice Questions with Answers)
Q1. State Ohm’s Law and explain its application.
Answer: Ohm’s Law states that the current through a conductor is directly proportional to the voltage across it, provided the temperature remains constant. Application: Used to calculate resistance in circuits.
Q2. Differentiate between AC and DC.
Answer:
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AC changes direction periodically, while DC flows in one direction.
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AC is generated by alternators, DC by batteries.
Q3. With a diagram, explain the working of a full-wave rectifier.
Answer: A full-wave rectifier uses four diodes in a bridge arrangement to convert both halves of an AC waveform to DC.
Q4. State three uses of a capacitor.
Answer:
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Energy storage
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Filtering in power supplies
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Tuning in radio circuits
Q5. Explain the function of a fuse.
Answer: A fuse protects a circuit by melting when current exceeds safe limits, thus breaking the circuit.
Q6. Define a logic gate and give examples.
Answer: Logic gates are digital circuits that perform logical operations. Examples: AND gate, OR gate, NOT gate.
Q7. Draw and explain the symbol of a transistor.
Answer: Transistors have three terminals: base, collector, emitter. They act as switches or amplifiers.
Q8. State four properties of a good conductor.
Answer:
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Low resistance
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High conductivity
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Ductility
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Ability to carry large current
Q9. Explain the difference between fixed and variable resistors.
Answer: Fixed resistors have constant values, while variable resistors (rheostats/potentiometers) can be adjusted.
Q10. What are the advantages of using semiconductors in electronics?
Answer:
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Small size
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Low power consumption
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High reliability
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Cost efficiency
Conclusion
The 2025 WAEC GCE Basic Electronics Obj & Essay Questions and Answers (Nov/Dec WASSCE for Private Candidates) provided in this article are strictly for practice and preparation. Candidates are advised to:
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Study past questions
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Revise the WAEC syllabus
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Practice calculations and diagrams
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Manage exam time effectively
With adequate preparation, candidates can excel in both the Objective and Essay papers for WAEC GCE Basic Electronics 2025.
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