ELECTRICAL SHOCK PREVENTION
EXAMINATION WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. Which condition creates the greatest immediate risk of electrical
shock when a worker handles energized equipment?
A. Wearing a hard hat
B. Working on a dry wooden surface
C. Simultaneous contact with an energized conductor and an effective
ground path
D. Using an insulated screwdriver
Answer: C. Simultaneous contact with an energized conductor and
an effective ground path
Rationale: Electrical shock occurs when current passes through the
body. Contact with an energized conductor combined with a
conductive path to ground can allow potentially dangerous current to
flow through the worker. The severity depends on current magnitude,
duration, pathway, and other factors.
2. Which factor most directly determines the amount of current that
will flow through a person's body when contact with an energized
source occurs?
A. Color of the conductor
B. Total impedance of the circuit, including body resistance
1
,C. Size of the worker's shoes
D. Voltage label font size
Answer: B. Total impedance of the circuit, including body resistance
Rationale: Ohm's law establishes that current is related to voltage and
resistance. A higher body and circuit impedance generally limits
current, while reduced resistance—such as from moisture, damaged
skin, or conductive surroundings—can substantially increase current
through the body.
3. Why is wet skin particularly dangerous during electrical work?
A. Water always increases voltage
B. Moisture can significantly reduce skin resistance
C. Water prevents current from entering the body
D. Wet skin automatically trips every circuit breaker
Answer: B. Moisture can significantly reduce skin resistance
Rationale: Dry skin can provide substantial resistance, but moisture
can reduce that resistance considerably. Consequently, more current
may pass through the body for the same applied voltage. Wet locations
therefore require additional controls and careful equipment selection.
4. A worker discovers that an extension cord has exposed copper
conductors because its outer insulation has been cut. What is the
safest action?
A. Wrap the damaged section with ordinary adhesive tape and continue
using it
B. Use the cord only at low load
C. Remove the cord from service and have it properly repaired or
2
,replaced
D. Place the damaged portion underneath a rubber mat
Answer: C. Remove the cord from service and have it properly
repaired or replaced
Rationale: Exposed conductors can create shock, short-circuit, and
fire hazards. Temporary covering with ordinary tape does not restore
the cord to a safe condition. Damaged electrical equipment should be
removed from service until appropriately repaired or replaced.
5. What is the primary purpose of a Ground-Fault Circuit
Interrupter (GFCI)?
A. Increase circuit voltage
B. Detect certain unintended current paths to ground and rapidly
interrupt the circuit
C. Prevent every possible electrical arc
D. Replace all circuit breakers
Answer: B. Detect certain unintended current paths to ground and
rapidly interrupt the circuit
Rationale: A GFCI monitors current balance between conductors and
trips when it detects a ground-fault condition within its operating
characteristics. It is designed primarily to reduce the risk of severe
electric shock, particularly where people may contact grounded
surfaces.
6. A worker presses the TEST button on a GFCI and the device does
not trip. What should the worker do?
A. Continue working because the circuit breaker is present
B. Reset the GFCI repeatedly until it works
3
, C. Remove the device or circuit from service and have the problem
investigated
D. Bypass the GFCI
Answer: C. Remove the device or circuit from service and have the
problem investigated
Rationale: A GFCI that fails its required test cannot be assumed to
provide shock protection. Bypassing or repeatedly resetting a
malfunctioning protective device can expose workers to serious
hazards.
7. Which practice provides the strongest protection against electrical
shock when maintenance is performed on equipment that can be de-
energized?
A. Wearing cotton gloves
B. Standing farther away from the equipment
C. De-energizing, isolating, locking/tagging, and verifying absence of
voltage
D. Turning the equipment off using its normal operating switch only
Answer: C. De-energizing, isolating, locking/tagging, and verifying
absence of voltage
Rationale: Proper energy isolation prevents unexpected energization.
The normal control switch may not isolate all energy sources.
Lockout/tagout and verification with appropriate test equipment
provide a substantially stronger protective approach.
8. Why must absence of voltage be verified after electrical
equipment has been de-energized?
4
EXAMINATION WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. Which condition creates the greatest immediate risk of electrical
shock when a worker handles energized equipment?
A. Wearing a hard hat
B. Working on a dry wooden surface
C. Simultaneous contact with an energized conductor and an effective
ground path
D. Using an insulated screwdriver
Answer: C. Simultaneous contact with an energized conductor and
an effective ground path
Rationale: Electrical shock occurs when current passes through the
body. Contact with an energized conductor combined with a
conductive path to ground can allow potentially dangerous current to
flow through the worker. The severity depends on current magnitude,
duration, pathway, and other factors.
2. Which factor most directly determines the amount of current that
will flow through a person's body when contact with an energized
source occurs?
A. Color of the conductor
B. Total impedance of the circuit, including body resistance
1
,C. Size of the worker's shoes
D. Voltage label font size
Answer: B. Total impedance of the circuit, including body resistance
Rationale: Ohm's law establishes that current is related to voltage and
resistance. A higher body and circuit impedance generally limits
current, while reduced resistance—such as from moisture, damaged
skin, or conductive surroundings—can substantially increase current
through the body.
3. Why is wet skin particularly dangerous during electrical work?
A. Water always increases voltage
B. Moisture can significantly reduce skin resistance
C. Water prevents current from entering the body
D. Wet skin automatically trips every circuit breaker
Answer: B. Moisture can significantly reduce skin resistance
Rationale: Dry skin can provide substantial resistance, but moisture
can reduce that resistance considerably. Consequently, more current
may pass through the body for the same applied voltage. Wet locations
therefore require additional controls and careful equipment selection.
4. A worker discovers that an extension cord has exposed copper
conductors because its outer insulation has been cut. What is the
safest action?
A. Wrap the damaged section with ordinary adhesive tape and continue
using it
B. Use the cord only at low load
C. Remove the cord from service and have it properly repaired or
2
,replaced
D. Place the damaged portion underneath a rubber mat
Answer: C. Remove the cord from service and have it properly
repaired or replaced
Rationale: Exposed conductors can create shock, short-circuit, and
fire hazards. Temporary covering with ordinary tape does not restore
the cord to a safe condition. Damaged electrical equipment should be
removed from service until appropriately repaired or replaced.
5. What is the primary purpose of a Ground-Fault Circuit
Interrupter (GFCI)?
A. Increase circuit voltage
B. Detect certain unintended current paths to ground and rapidly
interrupt the circuit
C. Prevent every possible electrical arc
D. Replace all circuit breakers
Answer: B. Detect certain unintended current paths to ground and
rapidly interrupt the circuit
Rationale: A GFCI monitors current balance between conductors and
trips when it detects a ground-fault condition within its operating
characteristics. It is designed primarily to reduce the risk of severe
electric shock, particularly where people may contact grounded
surfaces.
6. A worker presses the TEST button on a GFCI and the device does
not trip. What should the worker do?
A. Continue working because the circuit breaker is present
B. Reset the GFCI repeatedly until it works
3
, C. Remove the device or circuit from service and have the problem
investigated
D. Bypass the GFCI
Answer: C. Remove the device or circuit from service and have the
problem investigated
Rationale: A GFCI that fails its required test cannot be assumed to
provide shock protection. Bypassing or repeatedly resetting a
malfunctioning protective device can expose workers to serious
hazards.
7. Which practice provides the strongest protection against electrical
shock when maintenance is performed on equipment that can be de-
energized?
A. Wearing cotton gloves
B. Standing farther away from the equipment
C. De-energizing, isolating, locking/tagging, and verifying absence of
voltage
D. Turning the equipment off using its normal operating switch only
Answer: C. De-energizing, isolating, locking/tagging, and verifying
absence of voltage
Rationale: Proper energy isolation prevents unexpected energization.
The normal control switch may not isolate all energy sources.
Lockout/tagout and verification with appropriate test equipment
provide a substantially stronger protective approach.
8. Why must absence of voltage be verified after electrical
equipment has been de-energized?
4
