Page 1 of 88
NCCER Module 1: Basic Safety EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST UPDATE THIS
YEAR
Exam Coverage – NCCER Module 1: Basic Safety
This module covers fundamental safety principles for construction and industrial worksites, as
defined by NCCER’s Basic Safety curriculum. Key topics include: Hazard communication
standard (HAZCOM) – Safety Data Sheets (SDS), container labeling, GHS pictograms; personal
protective equipment (PPE) – selection, use, inspection, donning/doffing; fall protection –
guardrails, safety nets, personal fall arrest systems (PFAS), anchorage points, lanyards,
lifelines; electrical safety – lockout/tagout (LOTO), ground-fault circuit interrupters (GFCIs), cord
and tool inspection, working near energized parts, approach boundaries; fire safety – fire
classes (A, B, C, D, K), fire extinguisher selection (PASS technique), emergency response,
evacuation; hand and power tool safety – guarding, proper use, inspection; housekeeping and
worksite hazards – slips, trips, falls, material storage, signage, barricades; permit-required
confined spaces – hazards (atmospheric, engulfment, mechanical), roles (entrant, attendant,
supervisor), continuous monitoring; excavation safety – protective systems (sloping, shoring,
shielding), spoil pile placement, access/egress; material handling – safe lifting techniques,
rigging, crane hand signals; emergency response – first aid, CPR/AED, emergency action plans
(EAP), reporting incidents; environmental safety and health – silica, lead, asbestos, fall
, Page 2 of 88
protection awareness; and safety culture – stop-work authority, reporting hazards,
communication, and employer/employee responsibilities under OSHA.
200 Randomized, Scenario-Based MCQs for NCCER Module 1 Basic Safety
1. A construction worker notices a frayed electrical cord on a power tool. Which action is the
safest and most appropriate under basic safety principles?
A) Wrap electrical tape over the frayed area and continue working
B) Tag out the tool, remove it from service, and report the damage to a supervisor
C) Continue using the tool because the cut is only on the outer sheath
D) Cut the cord completely to make it safer
Answer: B
RATIONALE: Damaged cords create shock and fire hazards. The tool must be removed from
service, tagged out, and reported for repair or replacement per LOTO and electrical safety
standards.
2. A worker is about to enter a permit-required confined space. Which atmospheric hazard must
be continuously monitored while the worker is inside?
A) Oxygen level, flammable gases, and toxic substances
B) Temperature and humidity only
C) Noise levels and vibration only
D) Light intensity only
Answer: A
, Page 3 of 88
RATIONALE: Confined spaces require continuous monitoring of oxygen (19.5-23.5%), flammable
gases (below 10% LEL), and potential toxic contaminants (e.g., H2S, CO).
3. A crew is working on a scaffold platform 15 feet above ground without guardrails. Which fall
protection system is required by OSHA?
A) Safety net only
B) Personal fall arrest system (PFAS) or guardrails
C) Warning line only
D) Safety belt without lanyard
Answer: B
RATIONALE: Fall protection is required at 6 feet in construction. Guardrails or a PFAS (harness,
lanyard, anchorage) must be used; a body belt is not acceptable.
4. A worker notices a new chemical on site with a container that has a flame pictogram and an
exclamation mark. According to GHS/HAZCOM, what hazards does this chemical present?
A) Corrosive and environmental toxicity
B) Flammable and acute toxicity/irritant
C) Explosive and carcinogenic only
D) Oxidizer and biohazard
Answer: B
RATIONALE: The flame pictogram indicates flammability; the exclamation mark indicates acute
toxicity, skin/eye irritation, or specific target organ toxicity (single exposure).
, Page 4 of 88
5. An electrician must perform maintenance on a 480-volt circuit. What is the first step in the
lockout/tagout (LOTO) procedure before starting work?
A) Remove the fuse or circuit breaker
B) Notify all affected employees of the shutdown
C) Place a lock and tag on the energy-isolating device
D) Test the circuit to verify it is de-energized
Answer: B
RATIONALE: LOTO requires notifying all affected employees before shutdown. Then the
equipment is shut down, isolated, locked/tagged, and verified de-energized.
6. A worker using a circular saw removes the blade guard because it interferes with a cut. What
is the correct safety action?
A) Continue making the cut slowly without the guard
B) Stop work and find a different tool or method that allows the guard to remain in place
C) Have another worker hold the cord during the cut
D) Remove the blade to prevent injury
Answer: B
RATIONALE: Removing a blade guard is prohibited; a safe alternative tool or method must be
found. Guards are critical for preventing contact with the blade.
7. During a fire, a worker chooses a fire extinguisher labeled Class B. What type of fire is this
extinguisher designed to fight?
A) Ordinary combustibles (wood, paper, cloth)
NCCER Module 1: Basic Safety EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST UPDATE THIS
YEAR
Exam Coverage – NCCER Module 1: Basic Safety
This module covers fundamental safety principles for construction and industrial worksites, as
defined by NCCER’s Basic Safety curriculum. Key topics include: Hazard communication
standard (HAZCOM) – Safety Data Sheets (SDS), container labeling, GHS pictograms; personal
protective equipment (PPE) – selection, use, inspection, donning/doffing; fall protection –
guardrails, safety nets, personal fall arrest systems (PFAS), anchorage points, lanyards,
lifelines; electrical safety – lockout/tagout (LOTO), ground-fault circuit interrupters (GFCIs), cord
and tool inspection, working near energized parts, approach boundaries; fire safety – fire
classes (A, B, C, D, K), fire extinguisher selection (PASS technique), emergency response,
evacuation; hand and power tool safety – guarding, proper use, inspection; housekeeping and
worksite hazards – slips, trips, falls, material storage, signage, barricades; permit-required
confined spaces – hazards (atmospheric, engulfment, mechanical), roles (entrant, attendant,
supervisor), continuous monitoring; excavation safety – protective systems (sloping, shoring,
shielding), spoil pile placement, access/egress; material handling – safe lifting techniques,
rigging, crane hand signals; emergency response – first aid, CPR/AED, emergency action plans
(EAP), reporting incidents; environmental safety and health – silica, lead, asbestos, fall
, Page 2 of 88
protection awareness; and safety culture – stop-work authority, reporting hazards,
communication, and employer/employee responsibilities under OSHA.
200 Randomized, Scenario-Based MCQs for NCCER Module 1 Basic Safety
1. A construction worker notices a frayed electrical cord on a power tool. Which action is the
safest and most appropriate under basic safety principles?
A) Wrap electrical tape over the frayed area and continue working
B) Tag out the tool, remove it from service, and report the damage to a supervisor
C) Continue using the tool because the cut is only on the outer sheath
D) Cut the cord completely to make it safer
Answer: B
RATIONALE: Damaged cords create shock and fire hazards. The tool must be removed from
service, tagged out, and reported for repair or replacement per LOTO and electrical safety
standards.
2. A worker is about to enter a permit-required confined space. Which atmospheric hazard must
be continuously monitored while the worker is inside?
A) Oxygen level, flammable gases, and toxic substances
B) Temperature and humidity only
C) Noise levels and vibration only
D) Light intensity only
Answer: A
, Page 3 of 88
RATIONALE: Confined spaces require continuous monitoring of oxygen (19.5-23.5%), flammable
gases (below 10% LEL), and potential toxic contaminants (e.g., H2S, CO).
3. A crew is working on a scaffold platform 15 feet above ground without guardrails. Which fall
protection system is required by OSHA?
A) Safety net only
B) Personal fall arrest system (PFAS) or guardrails
C) Warning line only
D) Safety belt without lanyard
Answer: B
RATIONALE: Fall protection is required at 6 feet in construction. Guardrails or a PFAS (harness,
lanyard, anchorage) must be used; a body belt is not acceptable.
4. A worker notices a new chemical on site with a container that has a flame pictogram and an
exclamation mark. According to GHS/HAZCOM, what hazards does this chemical present?
A) Corrosive and environmental toxicity
B) Flammable and acute toxicity/irritant
C) Explosive and carcinogenic only
D) Oxidizer and biohazard
Answer: B
RATIONALE: The flame pictogram indicates flammability; the exclamation mark indicates acute
toxicity, skin/eye irritation, or specific target organ toxicity (single exposure).
, Page 4 of 88
5. An electrician must perform maintenance on a 480-volt circuit. What is the first step in the
lockout/tagout (LOTO) procedure before starting work?
A) Remove the fuse or circuit breaker
B) Notify all affected employees of the shutdown
C) Place a lock and tag on the energy-isolating device
D) Test the circuit to verify it is de-energized
Answer: B
RATIONALE: LOTO requires notifying all affected employees before shutdown. Then the
equipment is shut down, isolated, locked/tagged, and verified de-energized.
6. A worker using a circular saw removes the blade guard because it interferes with a cut. What
is the correct safety action?
A) Continue making the cut slowly without the guard
B) Stop work and find a different tool or method that allows the guard to remain in place
C) Have another worker hold the cord during the cut
D) Remove the blade to prevent injury
Answer: B
RATIONALE: Removing a blade guard is prohibited; a safe alternative tool or method must be
found. Guards are critical for preventing contact with the blade.
7. During a fire, a worker chooses a fire extinguisher labeled Class B. What type of fire is this
extinguisher designed to fight?
A) Ordinary combustibles (wood, paper, cloth)
