CSLB C10 Test 1 | 120 Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. The California Contractors State License Board (CSLB) requires a
C-10 Electrical Contractor applicant to have how many years of
journey-level experience?
A. 2 years
B. 3 years
C. 4 years
D. 5 years
Rationale: CSLB requires at least four years of journey-level or higher
experience within the last ten years to qualify for the C-10 license.
2. The primary purpose of grounding electrical systems is to:
A. Increase voltage
B. Provide a safe path for fault current
C. Reduce wire size
D. Increase resistance
Rationale: Grounding provides a low-resistance path that allows fault
current to travel safely to earth and trip protective devices.
3. According to the National Electrical Code (NEC), the maximum
voltage for residential branch circuits is typically:
A. 60 volts
B. 120 volts
,C. 240 volts
D. 480 volts
Rationale: Standard residential systems commonly use 120/240-volt
single-phase power.
4. Conductors are typically made of which material due to its
conductivity and cost efficiency?
A. Steel
B. Iron
C. Copper
D. Zinc
Rationale: Copper is widely used because of its excellent electrical
conductivity and durability.
5. The NEC is published by the:
A. OSHA
B. National Fire Protection Association (NFPA)
C. Department of Energy
D. Federal Electric Board
Rationale: The NFPA publishes the National Electrical Code to
establish safe electrical installation standards.
6. A circuit breaker protects against:
A. Low voltage
B. Overcurrent
C. Low resistance
D. Grounding
, Rationale: Circuit breakers automatically interrupt current when it
exceeds safe limits.
7. Electrical resistance is measured in:
A. Volts
B. Amps
C. Ohms
D. Watts
Rationale: Ohms measure resistance to electrical current flow.
8. Voltage is the measure of:
A. Electrical flow
B. Resistance
C. Electrical pressure
D. Power usage
Rationale: Voltage represents the electrical pressure that pushes
electrons through a conductor.
9. The device used to measure voltage is a:
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
Rationale: A voltmeter measures the potential difference between
two points.
10. Ampere measures:
Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. The California Contractors State License Board (CSLB) requires a
C-10 Electrical Contractor applicant to have how many years of
journey-level experience?
A. 2 years
B. 3 years
C. 4 years
D. 5 years
Rationale: CSLB requires at least four years of journey-level or higher
experience within the last ten years to qualify for the C-10 license.
2. The primary purpose of grounding electrical systems is to:
A. Increase voltage
B. Provide a safe path for fault current
C. Reduce wire size
D. Increase resistance
Rationale: Grounding provides a low-resistance path that allows fault
current to travel safely to earth and trip protective devices.
3. According to the National Electrical Code (NEC), the maximum
voltage for residential branch circuits is typically:
A. 60 volts
B. 120 volts
,C. 240 volts
D. 480 volts
Rationale: Standard residential systems commonly use 120/240-volt
single-phase power.
4. Conductors are typically made of which material due to its
conductivity and cost efficiency?
A. Steel
B. Iron
C. Copper
D. Zinc
Rationale: Copper is widely used because of its excellent electrical
conductivity and durability.
5. The NEC is published by the:
A. OSHA
B. National Fire Protection Association (NFPA)
C. Department of Energy
D. Federal Electric Board
Rationale: The NFPA publishes the National Electrical Code to
establish safe electrical installation standards.
6. A circuit breaker protects against:
A. Low voltage
B. Overcurrent
C. Low resistance
D. Grounding
, Rationale: Circuit breakers automatically interrupt current when it
exceeds safe limits.
7. Electrical resistance is measured in:
A. Volts
B. Amps
C. Ohms
D. Watts
Rationale: Ohms measure resistance to electrical current flow.
8. Voltage is the measure of:
A. Electrical flow
B. Resistance
C. Electrical pressure
D. Power usage
Rationale: Voltage represents the electrical pressure that pushes
electrons through a conductor.
9. The device used to measure voltage is a:
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
Rationale: A voltmeter measures the potential difference between
two points.
10. Ampere measures:
