300 QUESTIONS AND ANSWERS
1. What is the unit of electric current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: C. Ampere
Explanation: Current is measured in amperes (A), which indicates the flow of
electric charge.
2. What tool is used to strip insulation from wires?
A. Hacksaw
B. Wire stripper
C. Multimeter
D. Torque wrench
Answer: B. Wire stripper
Explanation: Wire strippers are designed to safely remove insulation without
damaging the wire.
3. What color is typically used for a ground wire?
A. Black
B. White
C. Green or bare
,D. Red
Answer: C. Green or bare
Explanation: Ground wires are usually green or uninsulated (bare) for easy
identification.
4. Which device protects a circuit from excessive current?
A. Switch
B. Fuse
C. Transformer
D. Capacitor
Answer: B. Fuse
Explanation: Fuses melt when too much current flows, breaking the circuit and
preventing damage.
5. What is the symbol for resistance?
A. V
B. A
C. Ω
D. W
Answer: C. Ω
Explanation: The Greek letter omega (Ω) symbolizes electrical resistance,
measured in ohms.
6. What does AC stand for in electricity?
A. Average Current
B. Amperage Control
C. Alternating Current
D. Accurate Current
Answer: C. Alternating Current
Explanation: AC refers to electric current that changes direction periodically.
,7. What is a voltmeter used to measure?
A. Current
B. Voltage
C. Resistance
D. Power
Answer: B. Voltage
Explanation: A voltmeter is used across components to measure electrical
potential difference.
8. What is the main purpose of a circuit breaker?
A. Generate electricity
B. Convert DC to AC
C. Prevent overcurrent
D. Ground the circuit
Answer: C. Prevent overcurrent
Explanation: Circuit breakers automatically interrupt current flow when it
exceeds safe levels.
9. What type of current do batteries produce?
A. AC
B. DC
C. Pulsed AC
D. Static current
Answer: B. DC
Explanation: Batteries produce direct current (DC), which flows in one
direction.
10. A 10-ohm resistor with 2 amps of current passing through it will drop how
many volts?
A. 5
B. 10
C. 20
D. 40
, Answer: C. 20
Explanation: V = IR → V = 10Ω × 2A = 20V.
11. Which tool measures resistance?
A. Clamp meter
B. Voltmeter
C. Ohmmeter
D. Ammeter
Answer: C. Ohmmeter
Explanation: An ohmmeter measures the electrical resistance in a circuit.
12. What does GFCI stand for?
A. Ground Fault Circuit Interrupter
B. Ground Fault Current Indicator
C. Grounded Fault Circuit Isolation
D. General Fuse Control Interface
Answer: A. Ground Fault Circuit Interrupter
Explanation: GFCIs protect people from electric shocks by cutting off current
when a fault is detected.
13. Which of these is a conductor?
A. Rubber
B. Glass
C. Copper
D. Plastic
Answer: C. Copper
Explanation: Copper is an excellent conductor of electricity due to its low
resistance.
14. What is the main safety device used when working on live circuits?
A. Safety glasses
B. Ladder
1. What is the unit of electric current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: C. Ampere
Explanation: Current is measured in amperes (A), which indicates the flow of
electric charge.
2. What tool is used to strip insulation from wires?
A. Hacksaw
B. Wire stripper
C. Multimeter
D. Torque wrench
Answer: B. Wire stripper
Explanation: Wire strippers are designed to safely remove insulation without
damaging the wire.
3. What color is typically used for a ground wire?
A. Black
B. White
C. Green or bare
,D. Red
Answer: C. Green or bare
Explanation: Ground wires are usually green or uninsulated (bare) for easy
identification.
4. Which device protects a circuit from excessive current?
A. Switch
B. Fuse
C. Transformer
D. Capacitor
Answer: B. Fuse
Explanation: Fuses melt when too much current flows, breaking the circuit and
preventing damage.
5. What is the symbol for resistance?
A. V
B. A
C. Ω
D. W
Answer: C. Ω
Explanation: The Greek letter omega (Ω) symbolizes electrical resistance,
measured in ohms.
6. What does AC stand for in electricity?
A. Average Current
B. Amperage Control
C. Alternating Current
D. Accurate Current
Answer: C. Alternating Current
Explanation: AC refers to electric current that changes direction periodically.
,7. What is a voltmeter used to measure?
A. Current
B. Voltage
C. Resistance
D. Power
Answer: B. Voltage
Explanation: A voltmeter is used across components to measure electrical
potential difference.
8. What is the main purpose of a circuit breaker?
A. Generate electricity
B. Convert DC to AC
C. Prevent overcurrent
D. Ground the circuit
Answer: C. Prevent overcurrent
Explanation: Circuit breakers automatically interrupt current flow when it
exceeds safe levels.
9. What type of current do batteries produce?
A. AC
B. DC
C. Pulsed AC
D. Static current
Answer: B. DC
Explanation: Batteries produce direct current (DC), which flows in one
direction.
10. A 10-ohm resistor with 2 amps of current passing through it will drop how
many volts?
A. 5
B. 10
C. 20
D. 40
, Answer: C. 20
Explanation: V = IR → V = 10Ω × 2A = 20V.
11. Which tool measures resistance?
A. Clamp meter
B. Voltmeter
C. Ohmmeter
D. Ammeter
Answer: C. Ohmmeter
Explanation: An ohmmeter measures the electrical resistance in a circuit.
12. What does GFCI stand for?
A. Ground Fault Circuit Interrupter
B. Ground Fault Current Indicator
C. Grounded Fault Circuit Isolation
D. General Fuse Control Interface
Answer: A. Ground Fault Circuit Interrupter
Explanation: GFCIs protect people from electric shocks by cutting off current
when a fault is detected.
13. Which of these is a conductor?
A. Rubber
B. Glass
C. Copper
D. Plastic
Answer: C. Copper
Explanation: Copper is an excellent conductor of electricity due to its low
resistance.
14. What is the main safety device used when working on live circuits?
A. Safety glasses
B. Ladder
