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HomeStrengthofMaterialsObjectiveQuestionsandAnswers132TOPStrengthofMaterialsMultipleChoiceQuestionsandAnswerspdf

132TOPStrengthofMaterialsMultipleChoiceQuestionsandAnswerspdfLatestStrengthofMaterialsQuestionsandAnswers

1.TheunitofforceinS.I.unitsis(a)kilogram(b)newton(c)watt(d)dyne(e)joule.Ans:b

2.TheunitofworkorenergyinS.I.unitsis(a)newton(b)pascal(c)kilogrammeter(d)watt(e)joule.Ans:e

3.TheunitofpowerinS.I.unitsis(a)newtonmeter(b)watt(c)joule(d)kilogrammeter/sec.(e)pascalpersec.Ans:b

4.Forcesarecalledconcurrentwhentheirlinesofactionmeetin(a)onepoint(b)twopoints(c)plane(d)perpendicularplanes(e)differentplanes.Ans:a

5.Forcesarecalledcoplanarwhenallofthemactingonbodyliein(a)onepoint(b)oneplane(c)differentplanes(d)perpendicularplanes(e)differentpoints.Ans:b

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6.Aforceactingonabodymay(a)introduceinternalstresses(b)balancetheotherforcesactingonit(c)retarditsmotion(d)changeitsmotion(e)alloftheabove.Ans:e

7.Whichisthecorrectstatementaboutlawofpolygonofforces?(a)ifanynumberofforcesactingatapointcanberepresentedbythesidesofapolygontakeninorder,thentheforcesareinequilibrium(b)ifanynumberofforcesactingatapointcanberepresentedindirectionandmagnitudebythesidesofapolygon,thentheforcesareinequilibrium(c)ifapolygonrepresentingforcesactingatapointisclosedthenforcesareinequilibrium(d)ifanynumberofforcesactingatapointcanberepresentedindirectionandmagnitudebythesidesofapolygontakeninorder,thentheforcesareinequilibrium(e)noneoftheabove.Ans:d

8.Effectofaforceonabodydependsupon(a)magnitude(b)direction(c)positionorlineofaction(d)alloftheabove(e)noneoftheabove.Ans:d

9.Ifanumberofforcesactsimultaneouslyonaparticle,itispossible(a)notareplacethembyasingleforce(b)toreplacethembyasingleforce(c)toreplacethembyasingleforcethroughC.G.(d)toreplacethembyacouple(e)toreplacethembyacoupleandaforce.Ans:b

11.Aforceiscompletelydefinedwhenwespecify(a)magnitude(b)direction(c)pointofapplication(d)alloftheabove(e)noneoftheabove.Ans:d

12.IftwoequalforcesofmagnitudePactatanangle9,theirresultantwillbe(a)P/2cos9/2(b)IPsin9/2(c)2Ptan9/2(d)IPcos9/2(e)Psin9/2.Ans:d

13.Thealgebraicsumoftheresolvedpartsofanumberofforcesinagivendirectionisequaltotheresolvedpartoftheirresultantinthesamedirection.Thisisaspertheprincipleof(a)forces(b)independenceofforces(c)dependenceofforces(d)balanceofforce(e)resolutionofforces.Ans:e

14.Theresolvedpartoftheresultantoftwoforcesinclinedatanangle9inagivendirectionisequalto(a)thealgebraicsumoftheresolvedpartsoftheforcesinthegivendirection(b)thesumoftheresolvedpartsoftheforcesinthegivendirection(c)thedifferenceoftheforcesmultipliedbythecosineof9(d)thesumoftheforcesmultipliedbythesineof9(e)thesumoftheforcesmultipliedbythetangentof9.Ans:a

15.Whichofthefollowingdonothaveidenticaldimensions?(a)Momentumandimpulse(b)Torqueandenergy(c)Torqueandwork(d)Kineticenergyandpotentialenergy(e)Momentofaforceandangularmomentum.Ans:e

16.Whichofthefollowingisnottheunitofdistance?(a)angstrom(b)lightyear(c)micron

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(d)millimeter(e)milestone.Ans:e

17.Whichofthefollowingisnottheunitofpower?(a)kW(kilowatt)(b)hp(horsepower)(c)kcal/sec(d)kgm/sec(e)kcal/kgsec.Ans:e

18.Whichofthefollowingisnottheunitofwork,energyandheat?(a)kcal(b)kgm(c)kWhr(d)hp(e)hphr.Ans:d

19.Whichofthefollowingisnottheunitofpressure?(a)kg/cm(b)ata(c)atmosphere(d)mmofwcl(e)newton.Ans:e

20.Theweightofabodyisdueto(a)centripetalforceofearth(b)gravitationalpullexertedbytheearth(c)forcesexperiencedbybodyinatmosphere(d)forceofattractionexperiencedbyparticles(e)gravitationalforceofattractiontowardsthecentreoftheearth.Ans:e

21.Theforces,whichmeetatonepoint,buttheirlinesofactiondonotlieinaplane,arecalled(a)coplanarnonconcurrentforces(b)noncoplanarconcurrentforces(c)noncoplanarnonconcurrentforces(d)intersectingforces(e)noneoftheabove.Ans:b

22.Whentryingtoturnakeyintoalock,followingisapplied(a)coplanarforce(b)noncoplanarforces(c)lever(d)moment(e)couple.Ans:e

23.Whichofthefollowingisnotascalarquantity(a)time(b)mass(c)volume(d)density(e)acceleration.Ans:e

24.Accordingtoprincipleoftransmissibilityofforces,theeffectofaforceuponabodyis(a)maximumwhenitactsatthecenterofgravityofabody(b)differentatdifferentpointsinitslineofaction(c)thesameateverypointinitslineofaction(d)minimumwhenitactsattheC.G.ofthebody(e)noneoftheabove.Ans:c

25.Whichofthefollowingisavectorquantity(a)energy(b)mass(c)momentum(d)angle(e)speed.Ans:c

26.Themagnitudeoftwoforces,whichwhenactingatrightangleproduceresultantforceofVlOkgandwhenactingat60produceresultantofVl3kg.Theseforcesare(a)2andV6(b)3and1kg(c)V5andV5

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(d)2and5(e)noneoftheabove.Ans:c

27.Anumberofforcesactingatapointwillbeinequilibriumif(a)theirtotalsumiszero(b)tworesolvedpartsintwodirectionsatrightanglesareequal(c)sumofresolvedpartsinanytwoperpendiculardirectionsarebothzero(d)allofthemareinclinedequally(e)noneoftheabove.Ans:c

28.Twononcollinearparallelequalforcesactinginoppositedirection(a)balanceeachother(b)constituteamoment(c)constituteacouple(d)constituteamomentofcouple(e)constitutearesultantcouple.Ans:c

29.Accordingtoprincipleofmoments(a)ifasystemofcoplanarforcesisinequilibrium,thentheiralgebraicsumiszero(b)ifasystemofcoplanarforcesisinequilibrium,thenthealgebraicsumoftheirmomentsaboutanypointintheirplaneiszero(c)thealgebraicsumofthemomentsofanytwoforcesaboutanypointisequaltomomentoftheiwesultantaboutthesamepoint(d)positiveandnegativecouplescanbebalanced(e)noneoftheabove.Ans:b

30.Whichofthefollowingisnotavectorquantity(a)weight(b)velocity(c)acceleration(d)force(e)moment.Ans:a

31.Accordingtolawoftriangleofforces(a)threeforcesactingatapointwillbeinequilibrium(b)threeforcesactingatapointcanberepresentedbyatriangle,eachsidebeingproportionaltoforce(c)ifthreeforcesactinguponapatticlearerepresentedinmagnitudeanddirectionbythesidesofatriangle,takeninorder,theywillbeinequilibrium(d)ifthreeforcesactingatapointareinequilibrium,eachforceisproportionaltothesineoftheanglebetweentheothertwo(e)noneoftheabove.Ans:c

1033.Ifarigidbodyisinequilibriumundertheactionofthreeforces,then(a)theseforcesareequal(b)thelinesofactionoftheseforcesmeetinapoint(c)thelinesofactionoftheseforcesareparallel(d)(b)and(c)above(e)noneoftheabove.Ans:d

1036.D'Alembert'sprincipleisusedfor(a)reducingtheproblemofkineticstoequivalentstaticsproblem(b)determiningstressesinthetruss(c)stabilityoffloatingbodies(d)designingsafestructures(e)solvingkinematicproblems.Ans:a

37.Aheavyladderrestingonfloorandagainstaverticalwallmaynotbeinequilibrium,if(a)thefloorissmooth,thewallisrough(b)thefloorisrough,thewallissmooth(c)thefloorandwallbotharesmoothsurfaces(d)thefloorandwallbothareroughsurfaces(e)willbeinequilibriumunderallconditions.Ans:c

38.AccordingtoLami'stheorem(a)threeforcesactingatapointwillbeinequilibrium(b)threeforcesactingatapointcanberepresentedbyatriangle,eachsidebeingproportionaltoforce(c)ifthreeforcesactinguponaparticlearerepresentedinmagnitudeanddirectionbythesidesofatriangle,takeninorder,theywillbeinequilibrium(d)ifthreeforcesactingatapointareinequilibrium,eachforceisproportionaltothesineoftheanglebetweentheothertwo(e)noneoftheabove.Ans:d

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39.Twocoplanarcoupleshavingequalandoppositemoments(a)balanceeachother(b)produceacoupleandanunbalancedforce(c)areequivalent(d)produceamomentofcouple(e)cannotbalanceeachother.Ans:e

40.Aframedstructureisperfectifitcontainsmembersequalto(a)2n3(b)nl(c)'2nl(d)n2(e)3n2.wheren=numberofjointsinaframeAns:a

42.Theproductofeitherforceofcouplewiththearmofthecoupleiscalled(a)resultantcouple(b)momentoftheforces(c)resultingcouple(d)momentofthecouple(e)noneoftheabove.Ans:d

43.Indetenniningstressesinframesbymethodsofsections,theframeisdividedintotwopartsbyanimaginarysectiondrawninsuchawayasnottocutmorethan(a)twomemberswithunknownforcesoftheframe(b)threememberswithunknownforcesoftheframe(c)fourmemberswithunknownforcesoftheframe(d)threememberswithknownforcesoftheframe(e)fourmemberswithtwoknownforces.Ans:b

44.Thecenterofgravityofauniformlaminaliesat(a)thecenterofheavyportion(b)thebottomsurface(c)themidpointofitsaxis(d)alloftheabove(e)noneoftheabove.Ans:c

45.Centerofgravityofasolidconeliesontheaxisattheheight(a)onefourthofthetotalheightabovebase(b)onethirdofthetotalheightabovebase(c)onehalfofthetotalheightabovebase(d)threeeighthofthetotalheightabovethebase(e)noneoftheabove.Ans:a

46.Centerofpercussionis(a)thepointofC.G.(b)thepointofmetacentre(c)thepointofapplicationoftheresultantofalltheforcestendingtocauseabodytorotateaboutacertainaxis(d)pointofsuspension(e)thepointinabodyaboutwhichitcanrotatehorizontallyandoscillateundertheinfluenceofgravity.Ans:c

47.Centerofgravityofathinhollowconeliesontheaxisataheightof(a)onefourthofthetotalheightabovebase(b)onethirdofthetotalheightabovebase(c)onehalfofthetotalheightabovebase(d)threeeighthofthetotalheightabovethebase(e)noneoftheabove.Ans:b

48.Theunitsofmomentofinertiaofanareaare(a)kgm2(b)m4(c)kg/m2(d)m3(e)kg/m4.Ans:b

49.ThecenterofpercussionofthehomogeneousrodoflengthLsuspendedatthetopwillbe(a)L/2(b)L/3(c)3L/4(d)2L/3(e)3L/8.



Ans:d

50.Thecenterofgravityofatriangleliesatthepointof(a)concurrenceofthemedians(b)intersectionofitsaltitudes(c)intersectionofbisectorofangles(d)intersectionofdiagonals(e)alloftheabove.Ans:a

51.Theunitsofmomentofinertiaofmassare(a)kgm2(b)m4(c)kg/m2(d)kg/m(e)m2/kg.Ans:a

52.Thepossibleloadinginvariousmembersofframedstructuresare(a)compressionortension(b)bucklingorshear(c)shearortension(d)alloftheabove(e)bending.Ans:a

53.Aheavystringattachedattwoendsatsamehorizontallevelandwhencentraldipisverysmallapproachesthefollowingcurve(a)catenary(b)parabola(c)hyperbola(d)elliptical(e)circulararc.Ans:b

54.Atrolleywireweighs1.2kgpermeterlength.Theendsofthewireareattachedtotwopoles20metersapart.Ifthehorizontaltensionis1500kgfindthedipinthemiddleofthespan(a)2.5cm(b)3.0cm(c)4.0cm(d)5.0cm(e)2.0cm.Ans:c

55.Fromacircularplateofdiameter6cmiscutoutacirclewhosediameterisaradiusoftheplate.Findthee.g.oftheremainderfromthecenterofcircularplate(a)0.5cm(b)1.0cm(c)1.5cm(d)2.5cm(e)0.25cm.Ans:a

58.Pickuptheincorrectstatementfromthefollowing:(a)TheC.G.ofacircleisatitscenter(b)TheC.G.ofatriangleisattheintersectionofitsmedians(c)TheC.G.ofarectangleisattheintersectionofitsdiagonals(d)TheC.G.ofasemicircleisatadistanceofr/2fromthecenter(e)TheCG.ofanellipseisatitscenter.Ans:d

59.Thecentreofpercussionofasolidcylinderofradiusrrestingonahorizontalplanewillbe(a)r/2(b)2r/3(c)r/A(d)3r/2(e)3r/A.Ans:d

62.Intheequationofvirtualwork,followingforceisneglected(a)reactionofanysmoothsurfacewithwhichthebodyisincontact(b)reactionofaroughsurfaceofabodywhichrollsonitwithoutslipping(c)reactionatapointoranaxis,fixedinspace,aroundwhichabodyisconstrainedtoturn(d)alloftheabove(e)noneoftheabove.Ans:d

63.Ifasuspendedbodyisstruckatthecentreofpercussion,thenthepressureondieaxispassingthroughthepointofsuspensionwillbe(a)maximum(b)minimum



(c)zero(d)infinity(e)sameastheforceapplied.Ans:c

65.Theresultantofthefollowingthreecouples20kgforce,0.5marm,$vesense30kgforce,1marm,vesense40kgforce,0.25marm,+vesensehavingarmof0.5mwillbe(a)20kg,vesense(b)20kg,+vesense(c)10kg,+vesense(d)10kg,vesense(e)45kg,+vesense.Ans:a

68.AngleoTfrictionisthe(a)anglebetweennormalreactionandtheresultantofnormalreactionandthelimitingfriction(b)ratiooflimitingfrictionandnormalreaction(c)theratioofminimumfrictionforcetothefrictionforceactingwhenthebodyisjustabouttomove(d)theratioofminimumfrictionforcetofrictionforceactingwhenthebodyisinmotion(e)ratioofstaticanddynamicfriction.Ans:a

69.Thecoefficientoffrictiondependson(a)areaofcontact(b)shapeofsurfaces(c)strengthofsurfaces(d)natureofsurface(e)alloftheabove.Ans:d

70.LeastforcerequiredtodrawabodyuptheinclinedplaneisWsin(planeinclination+frictionangle)appliedinthedirection(a)alongtheplane(b)horizontally(c)vertically(d)atanangleequaltotheangleoffrictiontotheinclinedplane(e)unpredictable.Ans:d

71.Theratiooflimitingfrictionandnormalreactionisknownas(a)coefficientoffriction(b)angleoffriction(c)angleofrepose(d)slidingfriction(e)frictionresistance.Ans:a

72.Whichoneofthefollowingstatementsisnotcorrect(a)thetangentoftheangleoffrictionisequaltocoefficientoffriction(b)theangleofreposeisequaltoangleoffriction(c)thetangentoftheangleofreposeisequaltocoefficientoffriction(d)thesineoftheangleofreposeisequaltocoefficienttofriction(e)noneoftheabove.Ans:d

73.Onaladderrestingonsmoothgroundandleaningagainstverticalwall,theforceoffrictionwillbe(a)towardsthewallatitsupperend(b)awayfromthewallatitsupperend(c)upwardsatitsupperend(d)downwardsatitsupperend(e)noneoftheabove.Ans:c

74.Ontheladderrestingonthegroundandleaningagainstasmoothverticalwall,theforceoffrictionwillbe(a)downwardsatitsupperend(b)upwardsatitsupperend(c)perpendiculartothewallatitsupperend(d)zeroatitsupperend(e)noneoftheabove.Ans:d

76.Frictionalforceencounteredaftercommencementofmotioniscalled(a)postfriction(b)limitingfriction(c)kinematicfriction(d)frictionalresistance(e)dynamicfriction.Ans:e

77.Coefficientoffrictionisthe(a)anglebetweennormalreactionandtheresultantofnormalreactionandthelimitingfriction



(b)ratiooflimitingfrictionandnormalreaction(c)thefrictionforceactingwhenthebodyisjustabouttomove(d)thefrictionforceactingwhenthebodyisinmotion(e)tangentofangleofrepose.Ans:b

78.Pickupwrongstatementaboutfrictionforcefordrysurfaces.Frictionforceis(a)proportionaltonormalloadbetweenthesurfaces(b)dependentonthematerialsofcontactsurface(c)proportionaltovelocityofsliding(d)independentoftheareaofcontactsurfaces(e)noneoftheaboveiswrongstatement.Ans:c

79.AbodyofweightWoninclinedplaneofabeingpulledupbyahorizontalforcePwillbeonthepointofmotionuptheplanewhenPisequalto(a)W(b)Wsin(a+$)(c)Wtan(a+



(a)tangentofanglebetweennormalreactionandtheresultantofnormalreactionandthelimitingfriction(b)ratiooflimitingfrictionandnormalreaction(c)thefrictionforceactingwhenthebodyisjustabouttomove(d)thefrictionforceactingwhenthebodyisinmotion(e)dynamicfriction.Ans:d

95.TheeffortrequiredtoliftaloadWonascrewjackwithhelixangleaandangleoffriction



Ans:c

105.Ifthreeforcesactingindifferentplanescanberepresentedbyatriangle,thesewillbein(a)nonequilibrium(b)partialequilibrium(c)fullequilibrium(d)unpredictable(e)noneoftheabove.Ans:a

106.Ifn=numberofmembersandy=numberofjoints,thenforaperfectframe,n=(a)j2(b)2jl(c)2/3(d)3/2(e)2/4.Ans:c

107.Abodymoves,fromrestwithaconstantaccelerationof5mpersec.Thedistancecoveredin5secismostnearly(a)38m(b)62.5m(C)96m(d)124m(e)240m.Ans:b

108.Aflywheelonamotorgoesfromrestto1000rpmin6sec.Thenumberofrevolutionsmadeisnearlyequalto(a)25(b)50(c)100(d)250(e)500.Ans:b

109Whichofthefollowingisthelocusofapointthatmovesinsuchamannerthatitsdistancefromafixedpointisequaltoitsdistancefromafixedlinemultipliedbyaconstantgreaterthanone(a)ellipse(b)hyperbola(c)parabola(d)circle(e)noneoftheabove.Ans:b

111.Whichofthefollowingisnottheunitofenergy(a)kgm(b)kcal(c)wattr(d)watthours(e)kgmx(m/sec)2.Ans:c

112.Asampleofmetalweighs219gmsinair,180gmsinwater,120gmsinanunknownfluid.Thenwhichiscorrectstatementaboutdensityofmetal(a)densityofmetalcan'tbedetermined(b)metalistwiceasdenseaswater(c)metalwillfloatinwater(d)metalistwiceasdenseasunknownfluid(e)noneoftheabove.Ans:a

113.TheC.G.ofasolidhemisphereliesonthecentralradius3r(a)atdistancefromtheplanebase3r(b)atdistancefromtheplanebase3r(c)atdistancefromtheplanebase3r(d)atdistancefromtheplanebaseor(e)atdistancefromtheplanebase.Ans:d

117.TheC.G.ofaplanelaminawillnotbeatitsgeometricalcentreinthecaseofa(a)rightangledtriangle(b)equilateraltriangle(c)square(d)circle(e)rectangle.Ans:a

119.TheC.G.ofarightcircularsolidconeofheighthliesatthefollowingdistancefromthebase(a)h/2(b)J/3(c)h/6(d)h/4



Labels:StrengthofMaterialsObjectiveQuestionsandAnswers

(e)3/i/5.Ans:d

122.TheM.I.ofhollowcircularsectionaboutacentralaxisperpendiculartosectionascomparedtoitsM.I.abouthorizontalaxisis(a)same(b)double(c)half(d)fourtimes(e)onefourth.Ans:b

126.Whichofthefollowingistheexampleofleveroffirstorder(a)armofman(b)pairofscissors(c)pairofclinicaltongs(d)alloftheabove(e)noneoftheabove.Ans:d

127.Apairofsmith'stongsisanexampleoftheleverof(a)zeiothorder(b)firstorder(c)secondorder(d)thirdorder(e)fourthorder.Ans:c

128.Intheleverofthirdorder,loadW,effortPandfulcrumFareorientedasfollows(a)WbetweenPandF(b)FbetweenWandP(c)PbetweenWandF(d)W,PandFallononeside(e)noneoftheabove.Ans:a

129.Theanglewhichaninclinedplanemakeswiththehorizontalwhenabodyplacedonitisabouttomovedownisknownasangleof(a)friction(b)limitingfriction(c)repose(d)kinematicfriction(e)staticfriction.Ans:c

130.Inactualmachines(a)mechanicaladvantageisgreaterthanvelocityratio(b)mechanicaladvantageisequaltovelocityratio(c)mechanicaladvantageislessthanvelocityratio(d)mechanicaladvantageisunity(e)noneoftheabove.Ans:c

131.Inidealmachines(a)mechanicaladvantageisgreaterthanvelocityratio(b)mechanicaladvantageisequaltovelocityratio(c)mechanicaladvantageislessthanvelocityratio(d)mechanicaladvantageisunity(e)noneoftheabove.Ans:b

132.Acablewithauniformlydistributedloadperhorizontalmetrerunwilltakethefollowingshape(a)straightline(b)parabola(c)hyperbola(d)elliptical(e)partofacircle.Ans:b

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