Basic Electrical Engineering MCQs (Part-1)

What is the SI unit of electric current?

A Volt
B Ohm
C Ampere
D Coulomb

Which law states that the current through a conductor is directly proportional to the voltage across it, provided the temperature remains constant?

A Kirchhoff’s Voltage Law
B Ohm’s Law
C Faraday’s Law
D Joule’s Law

What type of circuit allows electric current to flow along multiple paths?

A Series Circuit
B Parallel Circuit
C Open Circuit
D Short Circuit

Which device is used to measure electric current in a circuit?

A Voltmeter
B Ammeter
C Wattmeter
D Ohmmeter

What is the function of a fuse in an electrical circuit?

A To increase voltage
B To protect the circuit from overload
C To store energy
D To reduce resistance

In a DC circuit, the power is calculated as:

A \( P = IV \)
B \( P = I^2R \)
C \( P = V^2/R \)
D None of the above

Which material is commonly used as a conductor in electrical wiring?

A Copper
B Rubber
C Glass
D Wood

What happens to the total resistance in a series circuit when more resistors are added?

A It decreases
B It increases
C It remains the same
D It becomes zero

What is the primary purpose of a transformer?

A To generate electricity
B To measure current
C To change the voltage level
D To store energy

Which of the following quantities remains constant in a series circuit?

A Current
B Voltage
C Resistance
D Power

What does the term “electrical grounding” refer to?

A Reducing voltage
B Connecting a circuit to the Earth
C Increasing current flow
D Stopping electric shocks

Which law governs the total voltage around a closed loop in a circuit?

A Kirchhoff’s Voltage Law
B Ohm’s Law
C Coulomb’s Law
D Ampere’s Law

What is the main reason for using insulation on electrical wires?

A To reduce voltage
B To prevent current flow
C To avoid electric shocks
D To improve conductivity

What is the primary function of a capacitor in an AC circuit?

A To store charge
B To increase resistance
C To decrease voltage
D To block DC current

The resistance of a conductor depends on:

A Length and material
B Cross-sectional area
C Temperature
D All of the above

What is the unit of electrical energy?

A Joule
B Watt
C Volt
D Ampere

Which of the following is a non-ohmic conductor?

A Copper wire
B Filament of a bulb
C Aluminum wire
D Gold wire

What is the function of a diode?

A To amplify current
B To allow current in one direction only
C To store electrical energy
D To reduce resistance

Which of the following is a passive electrical component?

A Transistor
B Resistor
C Thyristor
D Diode

What does an electric circuit require to work?

A A power source
B Conductors
C A load
D All of the above