BC OWNER BUILDER AUTHORIZATION EXAM QUESTIONS
COMPLETE WITH 100% VERIFIED ANSWERS AND DETAILED
EXPLANATIONS
1. If workers are required to enter a trench over 1.2 m (4 ft) deep, the
safe point of entry and exit must be located:
a) within 8 m (25 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
b) within 5 m (16 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
c) within 7 m (23 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
d) within 10 m (32 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
Correct Answer: b) within 5 m (16 ft) of the workers and the
excavation must be safely supported or sloped to the entry and exit
location.
Rationale: The correct distance for safe entry and exit points from a
trench deeper than 1.2 m is within 5 m (16 ft). This ensures workers
have reasonable access to escape routes and the trench must be
properly supported or sloped for safety. This requirement is found in
occupational health and safety regulations for excavation work.
,2. At what depth is shoring required for an excavation or trench?
a) 1.5 m (5 ft)
b) 0.9 m (3 ft)
c) 1.2 m (4 ft)
d) 2.0 m (6.5 ft)
Correct Answer: c) 1.2 m (4 ft)
Rationale: Shoring or other protective measures are required for
excavations and trenches at a depth of 1.2 m (4 ft) or greater. This is a
fundamental safety requirement under BC construction safety
regulations to protect workers from cave-ins .
3. Which of the following is NOT an acceptable method for
determining the correct grading for a trench?
a) Sloped as specified in writing by a qualified registered professional
b) Sloped at angles dependent on soil conditions ensuring stable faces
c) Supported as specified in writing by a professional engineer
d) An experienced excavator says it's okay
Correct Answer: d) An experienced excavator says it's okay
Rationale: Relying on an experienced excavator's verbal opinion is not
an acceptable method for determining trench grading. Excavation safety
requires engineering specifications, documented soil analysis, or
approved shoring systems. Professional engineers must be involved for
proper assessment .
,4. What is the maximum vertical rise permitted in a single flight of
stairs?
a) 4.0 m
b) 3.7 m
c) 3.0 m
d) 4.5 m
Correct Answer: b) 3.7 m
Rationale: The vertical height of any flight of stairs shall not exceed 3.7
m according to the BC Building Code. This limitation ensures safe stair
usage and prevents excessively long flights that could cause fatigue or
fall hazards .
5. How high must a construction fence be around a building site?
a) 4 ft
b) 8 ft
c) 6 ft
d) 5 ft
Correct Answer: c) 6 ft
Rationale: Construction site fencing must be a minimum of 6 feet high
to provide adequate security and prevent unauthorized access to the
construction area .
, 6. What lighting safety certification is required for electrical products
in Canada?
a) UL certification
b) CSA safety certification
c) ETL certification
d) CE certification
Correct Answer: b) CSA safety certification
Rationale: In Canada, electrical and lighting products must have CSA
(Canadian Standards Association) safety certification. This ensures
products meet Canadian electrical safety standards and are approved
for use in Canada .
7. What grit of sandpaper would achieve the smoothest finish?
a) Low grit (e.g., 40-60)
b) Medium grit (e.g., 80-120)
c) High grit (e.g., 150-220+)
d) Any grit produces the same finish
Correct Answer: c) High grit (e.g., 150-220+)
Rationale: Higher grit sandpaper produces a smoother finish. The
finishing process typically starts with lower grit and progressively works
up to higher grit numbers for the smoothest result .
COMPLETE WITH 100% VERIFIED ANSWERS AND DETAILED
EXPLANATIONS
1. If workers are required to enter a trench over 1.2 m (4 ft) deep, the
safe point of entry and exit must be located:
a) within 8 m (25 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
b) within 5 m (16 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
c) within 7 m (23 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
d) within 10 m (32 ft) of the workers and the excavation must be safely
supported or sloped to the entry and exit location.
Correct Answer: b) within 5 m (16 ft) of the workers and the
excavation must be safely supported or sloped to the entry and exit
location.
Rationale: The correct distance for safe entry and exit points from a
trench deeper than 1.2 m is within 5 m (16 ft). This ensures workers
have reasonable access to escape routes and the trench must be
properly supported or sloped for safety. This requirement is found in
occupational health and safety regulations for excavation work.
,2. At what depth is shoring required for an excavation or trench?
a) 1.5 m (5 ft)
b) 0.9 m (3 ft)
c) 1.2 m (4 ft)
d) 2.0 m (6.5 ft)
Correct Answer: c) 1.2 m (4 ft)
Rationale: Shoring or other protective measures are required for
excavations and trenches at a depth of 1.2 m (4 ft) or greater. This is a
fundamental safety requirement under BC construction safety
regulations to protect workers from cave-ins .
3. Which of the following is NOT an acceptable method for
determining the correct grading for a trench?
a) Sloped as specified in writing by a qualified registered professional
b) Sloped at angles dependent on soil conditions ensuring stable faces
c) Supported as specified in writing by a professional engineer
d) An experienced excavator says it's okay
Correct Answer: d) An experienced excavator says it's okay
Rationale: Relying on an experienced excavator's verbal opinion is not
an acceptable method for determining trench grading. Excavation safety
requires engineering specifications, documented soil analysis, or
approved shoring systems. Professional engineers must be involved for
proper assessment .
,4. What is the maximum vertical rise permitted in a single flight of
stairs?
a) 4.0 m
b) 3.7 m
c) 3.0 m
d) 4.5 m
Correct Answer: b) 3.7 m
Rationale: The vertical height of any flight of stairs shall not exceed 3.7
m according to the BC Building Code. This limitation ensures safe stair
usage and prevents excessively long flights that could cause fatigue or
fall hazards .
5. How high must a construction fence be around a building site?
a) 4 ft
b) 8 ft
c) 6 ft
d) 5 ft
Correct Answer: c) 6 ft
Rationale: Construction site fencing must be a minimum of 6 feet high
to provide adequate security and prevent unauthorized access to the
construction area .
, 6. What lighting safety certification is required for electrical products
in Canada?
a) UL certification
b) CSA safety certification
c) ETL certification
d) CE certification
Correct Answer: b) CSA safety certification
Rationale: In Canada, electrical and lighting products must have CSA
(Canadian Standards Association) safety certification. This ensures
products meet Canadian electrical safety standards and are approved
for use in Canada .
7. What grit of sandpaper would achieve the smoothest finish?
a) Low grit (e.g., 40-60)
b) Medium grit (e.g., 80-120)
c) High grit (e.g., 150-220+)
d) Any grit produces the same finish
Correct Answer: c) High grit (e.g., 150-220+)
Rationale: Higher grit sandpaper produces a smoother finish. The
finishing process typically starts with lower grit and progressively works
up to higher grit numbers for the smoothest result .
