CSLB Class B General Contractor's License - Building's Exam: Core Trades (Part 2) Questions and Answers 2025/2026 100% Pass

CSLB Class B General Contractor's License -
Building's Exam: Core Trades (Part 2)
Questions and Answers 2025/2026 100% Pass
3AinchesA-ACORRECTAANSWERSA-
WhatAisAtheAminimumAdrainApipeAsizeAforAtheAtoiletAinAaAresidentialAhome?
B)AFireAprotectionAcontractorA-ACORRECTAANSWERSA-
WhoAisAlicensedAtoAinstallAresidentialAfireAsprinklerAsystems?

A)APlumbingAcontractor
B)AFireAprotectionAcontractor
C)AGeneralABuildingAcontractor
D)APipelineAcontractor
C)ACleanAtheAsurfaceAusingAaApowerAtoolA-ACORRECTAANSWERSA-
WhenAbrazingAorAsolderingAgasApipesAduringAtheAinstallationAofAwaterAheaters,AwhatAisAthe
AbestAwayAtoAprepareAtheApipe?




A)ACleanAitAwithAwater
B)ABlowAintoAtheApipeAusingAyourAlungs
C)ACleanAtheAsurfaceAusingAaApowerAtool
D)AUseAaApressurizedAairAcanister
D)AEndlessAropeAliftA-ACORRECTAANSWERSA-WhichApersonalAliftAisAnotAacceptable?

A)AScissor
B)ABoom
C)AManual
D)AEndlessAropeAlift
B)AToAsoftenAPVCApipeAbeforeAapplyingAPVCAcementA-ACORRECTAANSWERSA-
WhatAisAtheApurposeAofAPVCAprimer?

A)AToAglueAPVCApipesAtoAotherAmaterials
B)AToAsoftenAPVCApipeAbeforeAapplyingAPVCAcement
C)AToApreventAelectricalAshock
D)AToAhelpAsolderAconduitAorApiping
C)AFlashing

(LeaksAareAmostAcommonAwhenAtwoAsurfacesAmeetAorAaroundAfenestration.ALeaksAareAm
ostAprominentAinAvalleyAflashingAandAimproperlyAinstalledAwindowAflashing.)A-
ACORRECTAANSWERSA-WhatAisAtheAmostAcommonAlocationAtoAfindAaAroofAleak?




A)AAttic
B)AShingles

,C)AFlashing
D)ACollarAtie
C)APipeAsupportsAcomeAintoAcontactAwithAmetalApiping

(MainlyAdueAtoAwaterAhammer.)A-ACORRECTAANSWERSA-
WhatAisAtheAmostAcommonAreasonAforAnoiseAinApipingAwhenAaAwaterAfixtureAisAturnedAonAor
Aoff?




A)AHotAwaterAwasAused
B)AColdAwaterAwasAused
C)APipeAsupportsAcomeAintoAcontactAwithAmetalApiping
D)ATheAwallsAareAnotAupAtoAcodeAcausingApipeAfailure
C)ABrassAtypeA-ACORRECTAANSWERSA-IfAyouAsendAyourAemployeeAtoApurchaseAaA2-
inchAwaterAsupplyAvalveAandAtheyAreturnAwithAaA1.5-
inchAsupplyAvalve,AthenAwhatAisAtheAproperAcompositionAofAtheAvalve?

A)ATheAcasingAmustAbeAmadeAofAplastic
B)ATheAemployeeAmustAreturnAandApurchaseAaAwroughtAironAvalve
C)ABrassAtype
D)ATheAconnectionAmustAbeAsilverAandAbodyAmadeAofAiron
10A-ACORRECTAANSWERSA-
WhenApenetratingAaAroofAwithAanAexhaust,AtheAexhaustAmustAbeAnoAcloserAthanA_____Afee
tAtoAanyAairAintakeAorAopenableAwindow.
A)AClassAAA-ACORRECTAANSWERSA-WhichAroofAassemblyAhasAtheAbestAfireArating?

A)AClassAA
B)AClassAB
C)AClassAI
D)AClassAIII
D)AUseAofAmaterialsAthatAareAcompatibleAwithAtheAtypeAofApipeAandAfittingAmaterialsA-
ACORRECTAANSWERSA-

WhatAdoesAmaterialAcompatibilityAreferAtoAwhenAinstallingAalternateAwaterAsourcesAinAexisti
ngAplumbingAsystems?

A)APlumbingAfixturesAhaveAtoAcomeAfromAtheAsameAmanufacturer
B)AOnlyAtheAcouplingsAmustAbeAmadeAofAmetal
C)AAllAplumbingAconnectionsAmustAbeAsolderedAorAbrazed
D)AUseAofAmaterialsAthatAareAcompatibleAwithAtheAtypeAofApipeAandAfittingAmaterials
C)AWeatherAseal,AweatherAstrip,AandAapplyAcaulkingA-ACORRECTAANSWERSA-
WhenAyouAhaveAaAgapAinAtheAbuildingAenvelope,AwhatAdoAyouAdoAtoApreventAairAleakage?

A)AStuffAinsulationAintoAgaps
B)APutAcaulkingAinAandAaroundAtheAgaps
C)AWeatherAseal,AweatherAstrip,AandAapplyAcaulking
D)ANothing,AallAbuildingsArequireAairAleakage

, 18AinchesA-ACORRECTAANSWERSA-
InAorderAtoAprotectAaAwaterAheaterAfromAdamage,AwhatAisAtheAminimumAheightAitAshouldAbe
AfromAtheAfloorAofAaAgarage?

4

(AccordingAtoAtheACaliforniaAPlumbingACode,AtheAverticalApipingAbetweenAtwoAconsecutive
AinletAlevelsAshallAbeAconsideredAaAwet-ventedAsection.AEachAwet-

ventedAsectionAshallAbeAnotAlessAthanAoneApipeAsizeAexceedingAtheArequiredAminimumAwa
steApipeAsizeAofAtheAupperAfixtureAorAshallAbeAoneApipeAsizeAexceedingAtheArequiredAminim
umApipeAsizeAforAtheAsumAofAtheAfixtureAunitsAservedAbyAsuchAwet-
ventedAsection,AwhicheverAisAlarger,AbutAnoAcaseAlessAthanA2Ainches.)A-
ACORRECTAANSWERSA-

HowAmanyAplumbingAfixturesAcanAbeAventedAbyAaAsingleAverticalAwet-vent?
D)AInspectAtheAtankAandApumpAforAmechanicalAproblemsA-ACORRECTAANSWERSA-
AfterAtheAconstructionAofAaAnewAhomeAyouAturnAonAtheAfaucetAinAtheAkitchenAandAtheAwater
ApressureAisAextremelyAlow,AhowAshouldAyouAproceedAtoAtestAtheAproblem?




A)ACallAtheAinspector
B)AHireAaAplumbingAcontractor
C)ATurnAonAtheAlightAswitch
D)AInspectAtheAtankAandApumpAforAmechanicalAproblems
5/8"A-ACORRECTAANSWERSA-
WhenAdrillingAaA2AxA4AtheAminimumAdistanceAfromAtheAedgeAtoAtheAholeAshouldAbe:
0.75AinchesA-ACORRECTAANSWERSA-
WhatAisAtheAminimumAsizeAaAwaterAsupplyApipeAtoAaAbuilding?
NeverA-ACORRECTAANSWERSA-WhenAdoAyouAwetAaAconcreteAblockAduringAinstallation?
1/8AinchAperAfoot

SectionA408.5AofAtheACaliforniaAPlumbingACodeAstatesAthatAtheAfinishedAfloorAofAtheArecept
orAshouldAslopeAuniformlyAfromAtheAsidesAtowardsAtheAdrain,AnotAlessAthanA1/8AinchAperAfo
ot,AnorAmoreAthanA1/2AinchAperAfoot.AForAfurtherAclarification,AtheACaliforniaAPlumbingACod
eArefersAtoAfield-
fabricatedAshowerApansAasA"receptors."AItAisAimportantAnotAtoAconfuseAtheArequirementsAin
ACPCA408.5AwithACPCA408.7,AwhichAspecifiesAthatAtheAliningAmaterialsAforAshowersAandAre

ceptorsAshouldAbeApitchedA¼AinchAperAfootAtowardsAweepAholesAinAtheAsubdrainAofAaAsmoo
thAandAsolidlyAformedAsubbase.A-ACORRECTAANSWERSA-
WhatAisAtheAminimumAslopeAofAaAfinishedAshowerAfloor?
A)AEngineerA-ACORRECTAANSWERSA-
WhoAisAresponsibleAforAfinalAapprovalAofAplansAonAaApublicAworksAproject?

A)AEngineer
B)AHomeowner
C)ACity
D)AContractor
1AsquareAfoot