OSHA 30 FINAL EXAM NEWEST
ACTUAL EXAM 2025 QUESTIONS AND
DETAILED CORRECT ANSWERS
(VERIFIED ANSWERS) | A+ GRADE
Walkways must have handrails when at ________ or more
above lower level. Correct Answer 6 feet
Establishing eye contact with your equipment operator is a
general safety principle when working outside the working
radius. Correct Answer True
All surface encumbrances must be removed or supported
within: Correct Answer The zone of influence
A competent person must inspect all excavations,
adjacent areas, and protective systems daily,
____________, and as needed throughout the shift.
Correct Answer Before work begins
When using a ladder in a trench, it must be: Correct
Answer All of the above
Being dangerously close to a falling load is: Correct
Answer Not allowed
,Each of the following is true of accumulating water
hazards EXCEPT: Correct Answer Special supports or
shields are not allowed
Each of the following is true of underground installations
EXCEPT: Correct Answer They must be removed
A surface encumbrance is anything that could create a
___________ in or around a trench. Correct Answer
Hazard
When exposed to vehicular traffic, your evacuation site
must have: Correct Answer All of the above
Warning systems for Mobile Equipment include
barricades, hand signals, stop logs. Correct Answer True
Which are properties of cohesive soil: Correct Answer All
of the above
"Free-seeping" soil is considered submerged soil. Correct
Answer True
A hand-sized sample of cemented soil can't be crushed
into a powder. Correct Answer True
When vibrated, the cohesive material in wet soil will:
Correct Answer All of the above
An increase or a decrease in moisture can both damage
trench stability. Correct Answer True
,When a vertical face of a trench shears along a tension
crack line, it is known as: Correct Answer Toppling
Tension cracks are rarely a sign of imminent trench failure.
Correct Answer False
Boiling is an upward water flow into the bottom of the cut.
Correct Answer True
Heaving or squeezing can occur even when shoring or
shielding has been properly installed. Correct Answer True
An unsupported excavation can create an unbalanced
stress, causing: Correct Answer All of the above
Fissures are small cracks of stress in an exposed surface.
Correct Answer True
Time and weather are not major influences in soil stress.
Correct Answer False
A "slippery sheet" is a potential characteristic of: Correct
Answer Layered systems
The "adjacent area" is area on either side of the trench cut
equal to the depth of the trench. Correct Answer True
If cracked, fissured, vibrated, or otherwise disturbed, soil is
not: Correct Answer Type A
, Type C Soils are rated at below 0.5 tsp (tons per square
foot). Correct Answer True
Soil Types A, B, and C, are ranked in ________ order of
stability: Correct Answer Decreasing
Stable Rock: Correct Answer All of the above
The error rate of the pocket penetrometer is between 20%
and: Correct Answer 40%
Pocket Penetrometers are: Correct Answer All of the
above
A common visual test is to: Correct Answer All of the
above
The Thumb Penetration Test is subjective and the least
accurate test. Correct Answer True
If you have a trench greater than 20 feet deep: Correct
Answer You must use a Registered Professional Engineer
In most cases, Type A soil can be sloped up to: Correct
Answer 3/4 to 1
In layered soils, which layer has the most critical influence
on the slope of the excavation? Correct Answer Bottom
layer
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