Welcome To Www.ExamWeapon.Com

Click On Our Answer Page Below And Enter The Pin: "PIN 5555"

 Home JAMB WAEC NECO NABTEB NEWS

# Basic Electricity NABTEB past questions and answers

## Basic Electricity NABTEB past questions and answers

What does a voltmeter measure in an electrical circuit?

A) Voltage
B) Resistance
C) Current
D) Capacitance
Answer: A) Voltage
What is the term used to describe the opposition to the flow of alternating current in a circuit?

A) Reactance
B) Resistance
C) Conductance
D) Impedance
Answer: A) Reactance
Which law states that the total voltage in a series circuit is equal to the sum of individual voltages?

A) Ohm's Law
B) Kirchhoff's Voltage Law
C) Lenz's Law
D) Faraday's Law
Answer: B) Kirchhoff's Voltage Law
What is the symbol for an alternating current source in a circuit diagram?

A) ◻
B) ⎓
C) ~
D) ↦
Answer: C) ~
What device is used to protect sensitive electronic components from voltage spikes?

A) Fuse
B) Circuit Breaker
C) Surge Protector
D) Resistor
Answer: C) Surge Protector
Which law states that the direction of induced current in a circuit opposes the change in magnetic field that produced it?

A) Kirchhoff's Law
B) Lenz's Law
C) Faraday's Law
D) Ampere's Law
Answer: B) Lenz's Law
What does a transformer do in an electrical system?

A) Increases resistance
B) Converts DC to AC
C) Changes voltage levels
D) Stores electrical energy
Answer: C) Changes voltage levels
What is the role of a diode in an electrical circuit?

A) To store charge
B) To conduct electricity in both directions
C) To regulate voltage
D) To allow current flow in one direction
Answer: D) To allow current flow in one direction
Which component is used to smooth out variations in voltage in a circuit?

A) Capacitor
B) Resistor
C) Inductor
D) Transformer
Answer: A) Capacitor
What is the relationship between voltage, current, and resistance in a circuit according to Ohm's Law?

A) V = IR
B) I = VR
C) R = VI
D) V = I/R
Answer: D) V = I/R
Which material is often used as a semiconductor in electronic devices?

A) Copper
B) Aluminum
C) Silicon
D) Gold
Answer: C) Silicon
What is the unit of magnetic flux?

A) Weber
B) Tesla
C) Henry
D) Gauss
Answer: A) Weber
Which device converts mechanical energy into electrical energy?

A) Capacitor
B) Transformer
C) Generator
D) Inductor
Answer: C) Generator
What does an oscilloscope measure in an electrical circuit?

A) Voltage
B) Current
C) Frequency
D) Waveforms
Answer: D) Waveforms
What is the unit of electrical conductance?

A) Ohm
B) Farad
C) Siemens
D) Weber
Answer: C) Siemens
Which law states that the magnetic field induced around a current-carrying conductor is directly proportional to the current flowing through it?

A) Gauss's Law
B) Ampere's Law
C) Ohm's Law
D) Faraday's Law
Answer: B) Ampere's Law
What is the phenomenon where a material retains some magnetic properties after the magnetizing field is removed?

A) Induction
B) Hysteresis
C) Magnetization
D) Flux
Answer: B) Hysteresis
What property of a circuit represents the opposition to the flow of alternating current due to capacitance and inductance?

A) Resistance
B) Reactance
C) Conductance
D) Impedance
Answer: D) Impedance
Which component is used to increase or decrease the voltage in a circuit?

A) Resistor
B) Capacitor
C) Transformer
D) Inductor
Answer: C) Transformer
What does a rectifier do in an electrical circuit?

A) Converts AC to DC
B) Regulates voltage
C) Increases resistance
D) Stores electrical energy
Answer: A) Converts AC to DC