NECO Electronics Questions 2024 Objective and Theory Latest Update
Are you wondering where you can find NECO electronics objective and theory questions to guide you before participating in the NECO exams?
The National Examination Council (NECO) is an examination body in Nigeria.
They conduct exams for high school students in June/July (Senior Secondary Certificate Examination) and November/December (General Certificate in Education).
We have compiled a list of theory and objective questions and answers to help you in your forthcoming exams.
NECO Electronics Objective and Theory Questions
The National Examinations Council (NECO) was created in April 1999 as a response from the Federal Government.
The 2024 NECO electronics questions are based on the SS1 to SS3 electronics syllabus.
So, all the questions you’ll see in this year’s exam are in the syllabus, and almost 95% of them are repeated.
Question 1
What is the primary function of a transistor in a circuit?
A) Amplification or switching
B) Energy storage
C) Voltage regulation
D) Current limiting
Answer: A
Question 2
Which device converts electrical energy into mechanical energy?
A) Motor
B) Resistor
C) Capacitor
D) Inductor
Answer: A
Question 3
What is the unit of measurement for current?
A) Ampere
B) Watt
C) Volt
D) Ohm
Answer: A
Question 4
What does IC stand for in electronics?
A) Integrated Circuit (Correct)
B) Inductive Capacitor
C) Internal Capacitance
D) Insulated Conductor
Answer: A
Question 5
What component is used to store electrical energy in a magnetic field?
A) Inductor
B) Capacitor
C) Resistor
D) Transistor
Answer A
Question 6
Which law states that the total current entering a junction must equal the total current leaving the junction?
A) Kirchhoff’s Current Law
B) Faraday’s Law
C) Ohm’s Law
D) Boyle’s Law
Answer: A
Question 7
What is the unit of power in electrical systems?
A) Watt
B) Ampere-hour
C) Volt-ampere
D) Joule
Answer: A
Question 8
What component is commonly used to protect circuits from excessive current?
A) Fuse
B) Capacitor
C) Diode
D) Inductor
Answer: A
Question 9
Which device is used to measure electrical resistance?
A) Ohmmeter
B) Ammeter
C) Voltmeter
D) Multimeter
Answer: A
Question 10
What is the primary function of a voltage regulator in a circuit?
A) Maintain a constant voltage output
B) Amplify signals
C) Store electrical charge
D) Control current flow
Answer: A
Question 11
What is the function of an oscillator in electronics?
A) Generates periodic electrical signals
B) Regulates voltage
C) Stores energy
D) Controls current flow
Answer: A
Question 12
What component is used to store a small amount of charge in a circuit?
A) Capacitor
B) Resistor
C) Transistor
D) Inductor
Answer: A
Question 13
What does PWM stand for in electronics?
A) Pulse Width Modulation
B) Power Wave Modulation
C) Phase Width Modulation
D) Pulse Wave Manipulation
Answer: A
Question 14
Which device converts electrical energy into light energy?
A) LED
B) Resistor
C) Transistor
D) Capacitor
Answer: A
Question 15
What is the function of a rectifier in a circuit?
A) Converts AC to DC
B) Converts DC to AC
C) Regulates voltage
D) Stores energy
Answer: A
Question 16
Which law states that the voltage across a closed loop in a circuit is equal to the sum of the applied voltages?
A) Kirchhoff’s Voltage Law
B) Ohm’s Law
C) Faraday’s Law
D) Newton’s Law
Answer: A
Question 17
What does the acronym RFID stand for in electronics?
A) Radio-Frequency Identification
B) Remote Frequency Identification
C) Rapid Frequency Integration
D) Relay Frequency Identification
Answer: A
Question 18
What is the primary purpose of a transformer in a circuit?
A) Voltage transformation
B) Current regulation
C) Energy storage
D) Capacitance control
Answer: A
Question 19
Which component is used to store and release electrical energy quickly?
A) Capacitor
B) Resistor
C) Diode
D) Inductor
Answer: A
Question 20
What is the SI unit for capacitance?
A) Farad
B) Ohm
C) Ampere
D) Volt
Answer: A
NECO Basic Electronics Theory Questions and Answers
These are some of the theory questions that you may likely see in your exams;
Question 1
(a) List three electronic measuring instruments.
Answer: 1). Multimeter 2). Voltmeter 3). Ammeter
(b) State the instrument used for measuring the magnitude and period of the waveform.
Answer: The seismograph
(c) With the aid of a circuit diagram, explain how the range of an ammeter can be extended to read high-value currents.
Question 2
Define the following quantities for an RLC circuit.
i. Impedance
Answer: Impedance, denoted as Z, is a way to describe how much resistance an electronic part, circuit, or system has against both alternating and direct electric currents.
ii. Net reactance
Answer: In electrical circuits, Net reactance refers to the resistance that inductance and capacitance put up against alternating current.
Figure 1 represents the circuit diagram of an RLC circuit at resonance.
Determine the:
i. Impedance;
ii. Reactance of the capacitor;
iii. Capacitance of the capacitor.
Question 3
(a) State three advantages of a transistor over a triode.
Answer: 1). They are smaller in size. 2). They use less power. 3). They have a longer life span.
(b) State one reason why a triode is regarded as a voltage-controlled device.
Answer: The reason why a triode is regarded as a voltage-controlled device is because it can limit the voltage gain.
Question 4
(a) State the following laws of electromagnetic induction.
(i). Lenz’s law
Answer: Lenz’s law states that when a magnetic field changes in a circuit, the resulting electric current works against that change and creates a force that opposes any motion.
(ii). Faraday’s law
Answer: Faraday’s law states that the strength of the electric current generated in a circuit is directly linked to how quickly the magnetic field changes over time and cuts through the circuit.
(b) State four applications of electromagnetic induction.
Answer: 1). Current clamp. 2). Electric generators. 3). Electromagnetic forming. 4). Graphics tablet.
Question 5
(a). Define the following
(i). Impedance matching
Answer: Impedance matching is the process of designing or adjusting the input or output resistance of an electrical device to reach a specific desired value.
(ii). Class A amplifier
Answer: A Class A power amplifier is a type where the output current flows throughout the entire cycle of the AC input supply.
(iii). Biasing circuit
Answer: A bias circuit is a part of the device’s circuit that provides a constant current or voltage.
(b). List two applications of Class A amplifier
Answer: 1). Radio 2). Guitar amplifiers
The NECO Electronics objective and theory questions serve as valuable guides for students preparing for their exams.
Remember, these questions are selected based on the syllabus, offering you an easy way to succeed.
So, attempt those questions with confidence, and excel in your forthcoming exams
