NHI 130088 – Underwater Bridge Inspection Exam: Multiple-
Choice Practice Examination with Verified Questions and
Answers | Instant PDF Study Guide
Question 1
What is the primary purpose of an underwater bridge
inspection?
A. To determine the bridge's aesthetic condition
B. To verify the bridge's original construction cost
C. To identify and document deterioration, damage, or
conditions that could affect structural safety and serviceability
D. To eliminate the need for future inspections
, damage from debris or vessels, and deterioration of
underwater components. Proper documentation allows the
bridge owner to evaluate risk and determine appropriate
maintenance Rationale: The fundamental purpose of an
underwater inspection is to identify conditions that may
adversely affect the bridge. These can include scour,
undermining, corrosion, cracking, section loss or corrective
action.
Question 2
,Which bridge components are most commonly associated with
underwater inspection?
A. Traffic signals and roadway lighting
B. Submerged portions of piers, abutments, piles, footings,
and other components below the waterline
C. Pavement markings only
D. Expansion joints located exclusively on the deck
Rationale: Underwater inspections focus on structural
components that cannot be adequately evaluated from above
the water surface. Depending on the bridge, these may include
piles, pile caps, pier shafts, footings, submerged portions of
abutments, and scour-critical foundation elements.
Question 3
Why can an underwater inspection reveal conditions that are
not apparent during a topside inspection?
A. Water always increases the strength of concrete
B. Sediment, water, biological growth, and limited visibility
can conceal deterioration below the waterline
C. Above-water inspections are prohibited
D. Underwater components never deteriorate
Rationale: Conditions below the water surface can be hidden by
sediment, marine growth, turbidity, debris, or simply the
,inability to see the submerged surface from above. An
underwater inspection provides direct access to these areas and
can reveal deterioration that would otherwise remain
undetected.
Question 4
Which condition presents a particularly important concern
when evaluating a bridge foundation in a flowing river?
A. Faded paint
B. Roadway striping
C. Scour and loss of supporting material around the
foundation
D. Minor dirt accumulation on the deck
Rationale: Scour can remove soil or sediment supporting bridge
foundations. Excessive scour can reduce foundation capacity,
expose piles or footings, cause undermining, and potentially
contribute to structural instability. Because of this, scour
evaluation is a major consideration for bridges over waterways.
Question 5
What is scour?
A. Chemical deterioration of reinforcing steel
B. The erosion or removal of streambed or bank material by
, flowing water
C. Expansion of concrete caused by freezing
D. Settlement caused exclusively by traffic
Rationale: Scour occurs when flowing water removes bed or
bank material. Local scour can develop around piers and
abutments as flow patterns accelerate and form vortices. The
resulting loss of supporting material can expose or undermine
foundations.
Question 6
What is local scour?
A. Erosion occurring only along a roadway shoulder
B. Scour concentrated around an obstruction such as a pier or
abutment
C. Corrosion occurring inside a steel beam
D. Settlement of the bridge deck caused by traffic
Rationale: Local scour develops around individual bridge
components that interfere with flowing water. Piers and
abutments can alter flow patterns, producing turbulence and
vortices that increase erosion immediately around the
foundation.
Question 7
Choice Practice Examination with Verified Questions and
Answers | Instant PDF Study Guide
Question 1
What is the primary purpose of an underwater bridge
inspection?
A. To determine the bridge's aesthetic condition
B. To verify the bridge's original construction cost
C. To identify and document deterioration, damage, or
conditions that could affect structural safety and serviceability
D. To eliminate the need for future inspections
, damage from debris or vessels, and deterioration of
underwater components. Proper documentation allows the
bridge owner to evaluate risk and determine appropriate
maintenance Rationale: The fundamental purpose of an
underwater inspection is to identify conditions that may
adversely affect the bridge. These can include scour,
undermining, corrosion, cracking, section loss or corrective
action.
Question 2
,Which bridge components are most commonly associated with
underwater inspection?
A. Traffic signals and roadway lighting
B. Submerged portions of piers, abutments, piles, footings,
and other components below the waterline
C. Pavement markings only
D. Expansion joints located exclusively on the deck
Rationale: Underwater inspections focus on structural
components that cannot be adequately evaluated from above
the water surface. Depending on the bridge, these may include
piles, pile caps, pier shafts, footings, submerged portions of
abutments, and scour-critical foundation elements.
Question 3
Why can an underwater inspection reveal conditions that are
not apparent during a topside inspection?
A. Water always increases the strength of concrete
B. Sediment, water, biological growth, and limited visibility
can conceal deterioration below the waterline
C. Above-water inspections are prohibited
D. Underwater components never deteriorate
Rationale: Conditions below the water surface can be hidden by
sediment, marine growth, turbidity, debris, or simply the
,inability to see the submerged surface from above. An
underwater inspection provides direct access to these areas and
can reveal deterioration that would otherwise remain
undetected.
Question 4
Which condition presents a particularly important concern
when evaluating a bridge foundation in a flowing river?
A. Faded paint
B. Roadway striping
C. Scour and loss of supporting material around the
foundation
D. Minor dirt accumulation on the deck
Rationale: Scour can remove soil or sediment supporting bridge
foundations. Excessive scour can reduce foundation capacity,
expose piles or footings, cause undermining, and potentially
contribute to structural instability. Because of this, scour
evaluation is a major consideration for bridges over waterways.
Question 5
What is scour?
A. Chemical deterioration of reinforcing steel
B. The erosion or removal of streambed or bank material by
, flowing water
C. Expansion of concrete caused by freezing
D. Settlement caused exclusively by traffic
Rationale: Scour occurs when flowing water removes bed or
bank material. Local scour can develop around piers and
abutments as flow patterns accelerate and form vortices. The
resulting loss of supporting material can expose or undermine
foundations.
Question 6
What is local scour?
A. Erosion occurring only along a roadway shoulder
B. Scour concentrated around an obstruction such as a pier or
abutment
C. Corrosion occurring inside a steel beam
D. Settlement of the bridge deck caused by traffic
Rationale: Local scour develops around individual bridge
components that interfere with flowing water. Piers and
abutments can alter flow patterns, producing turbulence and
vortices that increase erosion immediately around the
foundation.
Question 7
