CIH Exam Questions and Answers Updated 2026

CIH Exam Questions and Answers
Updated 2026
BussinosisA-
AAnswerAAnAacuteAchestAtightnessAthatArefutesAatAtheAbeginningAofAeachAworkAweekAandAl
astA1AtoA2AdaysAinAearlyAstages.AEventuallyAbecomesAaAchronic,AdisablingAdisease

FromAexposureAtoAaAfinelyApulverizedAbractAofAtheAcottonAplant.ACottonAtextileAworkers



Raynaud'sASyndromeA-AAnswerAWhiteAfingersAdueAtoAvibration

WomanAareAmoreAsusceptible



HighAOctaveAbandA-
AAnswerAUpperAedgeAfrequencyAisAtheAsquareArootAofA2AtimesAtheAlowerAfrequencyAband



NitrogenAConcentrationAinAtheAoutsideAairA-AAnswerA78%



AreaAofAaAcircleAformulaA-AAnswerAA=πr²AorAA=D^2/4



OxygenADeficientAAtmosphereA-AAnswerALessAthanA19.5%



OxygenAConcentrationA@AseaAlevelA-AAnswerA20.9%



AdsorptionA-AAnswerAGases/liquidsAcollectAonAaAsolid



AbsorptionA-
AAnswerAGases/liquidsAcollectAonAaAsolidAorAliquidAandAaccompaniedAbyAaAchemicalAreactio
n

MoreApermanent



GravimetricAsettingAchambersA-
AAnswerAUsesAgravity,AchipAtraps.AOldestAmethod.ALowAflowAandAuniform.ALowAefficiency

,CycloneAcollectorsA-
AAnswerAAirAentersAtopAandAspiralsAdown,AthenAreversesAdirectionAandAtracesAupAtoAtheAo
utlet



BagAhouseAfiltersA-
AAnswerATubularAfabricAfiltersAinAaAhousing.AInexpensive,AnotAasAefficient.ARequiresAcleaning
ApluggingAcanAbeAaAproblemAandAnotAasAefficientAwhenAclean/new.



DynamicAprecipitatorA-
AAnswerAAAcomboAfanAandAdustAcollectionAdevise.ANoApressureAloss.AGasAflowAdeceasesAwi
thAbladeAwear.AEfficiencyAisAapproximatelyA70%



FiltrationA-AAnswerAFlowAthroughAaAporousAmembrane



wetAcollectorA-
AAnswerAUsesAaAliquidA(typicallyAwater)AtoAdesperateAparticulatesAfromAaerosols



SamplingAmediaA-AactivatedAcharcoalA-AAnswerAMostAcommon

UsedAforAorganicA

HighAabsorptiveAcapacity

NotArecommendedAforAforAhighlyAreactiveAcompounds



SampleAmediaA-AsilicaAgelA-AAnswerAUsedAforApolarAcompounds

LessAreactiveAthanAcharcoal

RecommendedAforAamines,Amethanol,Acreosols,APNAs,Aacids



IncidentArateA(IR)A-
AAnswerANumberAofAnewAcasesAofAaAdiseaseAperAworkerApopulationAperAtimeAperiod



PrevalenceArateA-
AAnswerANumberAofAexistingAcasesAofAaAdiseaseAinAaAworkerApopulationAatAaAspecificAtime



RelativeARiskA(RR)A-
AAnswerAPrevalenceArateAofAaAdiseaseAinAtheAexposedAworkerApopulationAdecidedAbyAtheA
prevalenceArateAofAdiseaseAinAtheAunexposedAworkerApopulation

,AttributedARiskA-
AAnswerAPrevalenceAofAdiseaseAinAtheAexposedAworkerApopulationAminusAtheAprevalenceAra
teAinAtheAunexposed



CaseAReportA-AAnswerAToApresentAclinicalAinformationAonAaAcase



Case-controlAstudyA-
AAnswerAIdentifyAaAgroupAofAworkersAwithAdiseaseAandAexamineAtheirAworkAhistoryAforApot
entialAexposures



cohortA-
AAnswerAIdentifyAaAgroupAofAworkersAbyAexposureAandAfollowAthemAoverAtimeAforAdevelop
mentAofAdiseases

TheseAstudiesAhaveAtheAmostApower



cross-sectionalAstudyA-
AAnswerASelectAaAgroupAofAworkersAirrespectiveAofAexposureAorAdiseaseAandAmeasureAover
Atime



MortalityAStudiesA-
AAnswerAComparingAmortalityArateAofAworkAwereApopulationAtoAaAcontrolApopulation



selectionAbiasA-AAnswerADifferentAcriteriaAusedAforAcasesAandAcontrols



ObservationABiasA-
AAnswerAInformationAonAdiseaseAoutcomeAobtainedAnAnoAcomparableAmannerAbetweenAexp
osedAandAnoAexposedAgroups



ConfoundingABiasA-
AAnswerAFailureAtoAtakeAintoAaccountAotherAvariablesA(ieAsmoking)AwhichAareAassociatedAwi
thAbothAdiseaseAandAtheAexposure



PIDsA-
AAnswerAExposeAtheAairAtoAUVAlight.AChemicalsAwithAionizingApotentialAbelowAtheAenergyAo
fAtheAUVAlightAwillAbeAionizedAandAgenerateAanAelectricalAsingleAthatAisAproportionalAtoAth
eAamountAofAchemicalApresent.

, #AofAsamplesAforAaAstatisticallyAvalidAmeanAandAconfidenceAintervalA(accordingAtoANIOSH)A-
AAnswerA6AorAmoreA

NIOSHAalsoAhasAaAchartAtoAreferenceAforAsampleA#sAbasedAonAemployeeA#s



Paper/PulpAManufacture

KraftAMethodA-
AAnswerAChemicalAmethodAorAsulfateAdigestion;AwoodAchopsAbrokenAdownAwithAsodiumAsul
fateAandAheat;AresultingApulpAisAbleachedAwashedAandAbleachedA(chorine);AwashesApulpAisA
rolled,AdriedAandAcut



PetroleumARefineriesAExposuresA-AAnswerABenzeneAandAhydrogenAsulfide



ThermoplasticsA-AAnswerASoftenArepeatedlyAwithAheat

Exposures:AhighA&AlowAdensityApolyethylene,Apolypropylene,Apolyvinylchoride,Apolystyrene



BrucellosisA-AAnswerABacteriaAtransmittedAtoAhumansAwhenAhandlingAinfectedAmeats



ArcAWeldingA-AAnswerAAnAarcA(4000oC$AisAstruckAbetweenAanAelectrodeAandAworkApieces

PPE:Agoggles,AfaceAshieldsAandAclothing

MostAcommonAdangersAareAUVAandAIR

CanAcreateAfumes



ClassAAAheadAprotectionA-AAnswerAImpactAandAlimitedAvoltages



ClassABAheadAprotectionA-AAnswerAImpactAandAhighAvoltages



ClassACAheadAprotectionA-AAnswerAImpactAprotectionAbutAnoAvoltageAprotection



LevelAAAPPEA-
AAnswerADCBAAorApositiveApressureAairlineAsystemAwithAescapeASCBAAandAtotallyAencapsula
tingAchemicalAprotectiveAsuit,AglovesAandAboots