Pennsylvania Occupational Health Nurse Exam Questions and Correct Answers 2026 – COHN/COHN-S Practice Test, Rationales & Certification Prep

PENNSYLVANIAINFRASTRUCTUREENGINEER B B




EXAM QUESTIONS AND CORRECT ANSWERS B B B B




(VERIFIED ANSWERS) PLUS RATIONALES
B B B B




2025|2026Q&A|INSTANTDOWNLOADPDF
B B B B B B




1. Theprimary purpose of a retainingwallis to:
B B B B B B B B




A) Provideaestheticappeal B B




B) Resistlateralsoilpressures B B B




C) Supportvertical loads only B B B




D) Drain surface water B B




Rationale:Retainingwalls aredesigned toresist lateralpressures from soil and water.
B B B B B B B B B B B B




2. In a simply supported beam with a uniform load, themaximum bending
B B B B B B B B B B B




moment occurs:
B B




A) At the supports
B B




B) At the midspan
B B




C) At one-quarterof the span
B B B B




D) Atboth ends B B




Rationale:Maximumbendingmoment foruniform load occurs atthemidspanof a
B B B B B B B B B B B B




simply supported beam.
B B B




3. Thestandard unit formeasuringsoilpermeability is:
B B B B B B B




A) N/m²
B) cm/s
C) kg/m³
D) Pa
Rationale: Soil permeability is measured asthevelocity of waterflow through soil per
B B B B B B B B B B B B B




unit area (cm/s).
B B B




4. Theprimarypurpose of a stormwaterdetention basin is to:
B B B B B B B B B




A) Providedrinkingwater B B




B) Controlpeakrunoffrates B B B

,C) Increasegroundwaterrechargeonly B B B




D) Reduceevaporation B




Rationale: Detentionbasinstemporarily storestormwaterto reducedownstream B B B B B B B




peak flows.
B B




5. Thefactor of safety in slope stability is defined as:
B B B B B B B B B




A) Ratio of slope heightto width B B B B B




B) Ratioof resistingforces to drivingforces
B B B B B B




C) Ratioof resisting moments todriving moments
B B B B B B




D) Ratio of soilcohesion tounit weight B B B B B B




Rationale: Factorof safetycompares resistingmoments to drivingmoments for slope B B B B B B B B B B




stability.
B




6. TheManning equation is used to calculate:
B B B B B B




A) Groundwaterflow B




B) Openchannel flow B B




C) Pipepressure B




D) Soil consolidationB




Rationale: Manning’sequationis a standard formula for estimatingopenchannel B B B B B B B B B




flow velocityanddischarge.
B B B




7. Themodulus of elasticity of steel typicallyranges around:
B B B B B B B B




A) 50 MPaB




B) 100 MPa B




C) 150 MPa B




D) 200 GPa B




Rationale: Structuralsteel has amodulus ofelasticityaround 200 GPa. B B B B B B B B B




8. Whichtype of foundation is mostsuitablefor heavy columns on weak soil?
B B B B B B B B B B B B




A) Spread footing B




B) Pile foundation
B




C) Shallowstrip footing B B




D) Mat slab B




Rationale: Pilefoundations transferloadsto deeper,stronger soillayers. B B B B B B B B

, 9. Darcy’slaw is applicable for: B B B B




A) Laminarflow inporous media B B B B




B) Turbulentpipeflow B B




C) Openchannel flow B B




D) Compressibleflow B




Rationale: Darcy’slaw applies to laminar flow of fluidsthrough porous materials. B B B B B B B B B B




10. Theprimarypurpose of a geotextilein road construction is to:
B B B B B B B B B B




A) Providestructuralstrengthonly B B B




B) Separation,filtration,andreinforcement B B B




C) Absorb water B




D) Reducetrafficload B B




Rationale: Geotextiles separatesoillayers,allowfiltration,and reinforce pavement B B B B B B B B




structure.
B




11. Themostcommon type of sewer systemin urban areas is:
B B B B B B B B B B




A) Gravitysewersystem B B




B) Pressuresewer B




C) Vacuumsewer B




D) Combinedsewer B




Rationale: Gravitysewersuse slope to transport wastewaterwithout pumping. B B B B B B B B




12. Concretewithhigh water-cementratiogenerally: B B B B B




A) Haslowerstrength
B B




B) Has higher strength
B B




C) Setsfaster B




D) Is more durable
B B




Rationale: Excesswaterincreases porosity,reducingconcretestrength. B B B B B B




13. Theplasticity index (PI) of soil measures:
B B B B B B




A) Soil density
B




B) Shear strength B




C) Plasticitycharacteristics B




D) Permeability
Rationale: PIis thenumericaldifferencebetweenliquid and plastic limits of soil.
B B B B B B B B B B B