北京四 中物理期中（The fourth physics period of Beijing）

北京四中物理期中(ThefourthphysicsperiodofBeijing)

Beijingfourthperiodin.Txtphysicsnotafraidofthieveswith

tools,afraidofthieves!1tastelife,perfecthumannature.

Existenceisopportunity,thinkingcanbeimproved.Peopleneed

tocontinuetobreaktheirown,shouldreassemblethemselves.

BeijingNo.4

Juniormiddleschoolphysicsexamination

First,fillintheblanks(1pointsperminute,30points)

1.physicsisasciencetostudyvariousphysicalphenomenain

natureandthe.Thebasicmethodof

physicsresearchis.

2.inthedatabackfillintheappropriateunitsornumbers:

(1)physicstextbookofapieceofpaperthicknessisabout

75,m;

(2)thetimeforaclassis45;

(3)thediameterofapencilis8;

(4)thecontaineroftheinkbottleis50.

3.asshowninFigure1isthelengthoftheexperimentalobject

withthescale,pleasecarefullyobservetheanswer:the

measuredobjectlengthiscm,whichistheexactvalue

of,estimatedvalueis.

Thethreebasiccharacteristicsofthe4.notesfor,

,and.Buyabowloftenputtwobowls

totouch,listentothesoundofthebowlcanknowismainly

isjudgedaccordingtothevoiceofthe

terminal;theship;swhistlesoundfromfaraway,becauseof

thelargewhistle.

The5.isinamagneticfieldcantransfermaterial

surroundingamagnet.Wehaveprovidedsmallneedleinthe

magneticfieldofapointwhenstillveryreferstothe

directionofthefieldofthepoint.

Thereare6.kindsofchargechargeinteractionsin

nature,theruleis.

7.LiYangstudentsfoundthatwhenadjustingthevolumeof

sound,thevibrationoftheloudspeakerislarge,indicating

thattheloudnessofsoundandsoundsource;ifthe

volumeremainedunchanged,andfeelyourselfawayfromthe

speakers,soundreduction,indicatingthatwiththe

loudness.

Threemainsteps:8.noisecontrolis,,

.Lateatnight,turnuptheTVspots,is

fromtheperspectiveofenvironmentalprotection.Fromthe

analysisofthecharacteristicsofsoundis.

Fourchargedbodiesof9.A,B,CandD.ABA,knowntoattract

C,CD,rejectionrejectionofthepositivelychargedA,B,C,

DBischargedwithelectric,Celectric,

Delectric.

Two,multiple-choicequestions(chooseonlyoneanswertoeach

question,eachof3points,atotalof30points)

10.thefollowingstatementiscorrect

A,erroranderrorcanbeavoided

B,averagingmultiplemeasurementscanavoiderrors

C,thezerowornscalecannotbeusedtomeasurethelengthof

D,inthemeasurement,errorscanbeavoided,theerrorcannot

beavoided

11.twostripmagnetsareplacedasshowninFigure2,anda

smal1ironnailisplacedoneachmagnet.Whenthetwomagnets

contacteachother,thesmallironnailswillbe()

AandBareclosetoeachother,awayfromeachother

C,D,fellmotionless

12.aftertheearthquake,becauseofthelackofthenecessary

selfknowledgeisoneofthereasonsthatthedeathtoll

increased.Thefollowingisaboutsomemeasuresburiedinthe

ruinsofthepeoplethemselvesarethemosteffective()

A,callforhelp

B,withahardobjecthittingtheprecastslabandwalls,to

helprescueworkers

Rescuepersonnel,suchasCandJing,cametorescue

D,seethegapdrill,climboutfromtheruins

13.withachargedbodyandhasapositivelycharged

electroscopeaftercontact,metalfoilelectroscopefirst

closedopenagain,whichcandeterminethefinalchargeofthe

chargedbodyandtheelectroscopefor()

AandBarepositivelychargedandnegativelycharged

C,thechargedbodyisnegativelycharged,positivelycharged

electroscopeD,unabletodeterminethefinal

Thebirdcallsand14.cattlecallsaredifferent,their

differenceis(voice)

ThetoneofAandcattlecallsishighandtheloudnessislarge

LoudnessB,cowbigbird,thetoneishigh

C,acowtonehighloudnessbirdbig

D,acowandabirdcalledtoneandequalloudness,toneis

different

Thefollowing15.onthecylinderandwrongisthecup()

A,inthelaboratory,ameasuringunitusedml

B,ascaleisuniform,andtheunevenscalemeasuringcup

UsingthemethodofC,andacupofthesame

D,thecylinderisusedtomeasurethevolumeofliquid,the

measuringcupisusedformeasuringthesolidvolume

Attheendof16.inalongpipefilledwithwatertapatthe

otherend,canhearthesoundof(for)

A,onlytohearasound,Bhasheardtwovoices

C,threeD,hasheardthevoiceandhearthreevoices

17.bymeasuringplasticlength,ifthetensileforceruler

measurement,themeasurementresultswillbe()

A,B,Cistoosmall,notaffectedbyD,toobigortoosmall

may

18.scientistsinthestudyfoundthatlivinginthenoisy

environmentofpeoplesusceptibletohypertension.Further

studieshavefoundthatpeoplewholivelongerthan55dBare

nearlytwiceaslikelytosufferfromhypertensionasthosewho

livebelow55dB.Theexpertreminds:duringthenighttoopen

thewindow,“moreopportunitiestothehypertension”.Ourcity-

residentslivingintheareaoftheprovisionsshallnotbe

higherthan45dBlevelatnight.Accordingtotheabove

informationtodeterminethefollowingisnottrue(is)

A.,B,glasscanstopsoundnoisenotonlycausehypertension

C,noiseonhumanharmshouldnotbeunderestimatedD,below

45dBvoiceisnotnoise

19.inthesamefourglassbottles,respectivelywithdifferent

amountsofwater,asshowninfigure3.Daolcanbeobtained

bytappingwithfinerods,

Ruai2,Mi3,FA4andruai2fourscalescalecorrespondingtothe

bottle(is)

Three,applicationanduse(eachof4points,atotalof20

points)

20.meterrepairsmallscrewdriverisgenerallyusedinstead

ofcopper,steel,thisiswhy?

21.WangMingclassmateworeanewnylonpants,lessthanaday

onalotofdust,aftergoinghome,hermothercriticizedher

notpayattentiontoclean,shewasnotconvincedtosay:"dust

rantothepants,hidecannothide.Momlistenedveryangry,

thinkshe'slying.CanyouhelpWangMingstudentsexplainwhy?

22.afteraheavysnow,thegroundiscoveredwithsnow,then

youwillfindaroundaveryquiet,thisiswhy?

23.modernarchitectureoftenusesa"vacuumglass”,installed

onthewindoworwall,youusetheacousticknowledgetoexplain

theadvantagesofthisglass.

24.noisepollutionisoneofthefourmajorpollutioninthe

worldtoday.Weoftenencounternoisearoundus.Pleasecite

thetwonoisearoundyouandthesolutions.

Four,experimentalresearch(4+4+6+6,20)

25.therearetwovolumesofdifferentthicknessofthethin

copperwire,arollofshowingthediameterofd=0.8mm,another

onthevolumelabelisoff.Withoutthescalemeasuringthe

lengthofthetool,howtomeasureanotherrolloffinecopper

wirediameterwithasimpleway.

(1)measurementprogramorprocedure

(2)keytotheexperimentis

26.inthenextfilmisasoaphanginghorn,whenthehumanvoice

istransferredtothefilmbythehorn,wewillsee

,thisphenomenoncan

beexplained.

27.Figure4deviceforexperimentalexploration,research

objectsareiron,aluminum,glass,paper,steelsheet.

Thesesubjectswereplacedinteshapedmagnetsandpaperclips,

pleasefillintheblanksaccordingtotheexperimental

researchresults:

Figure4

(1)insertclipwilldrop;

Insertclipwillnotfall.

(2)analysisofthereasonsforthisphenomenonare:

28.peopleoftenusereasoningmethodstostudyphysics

problems,andreasoningmethodscanbeusedinthestudyof

soundpropagationexperiment.AsshowninFigure5inthe

experiment,theexistingpumpingequipmentishardtoglassin

avacuumstate,inthiscase,youarehowthephenomenon

reasoning"soundcannottravelz/thisconclusioninavacuum?

Figure5

Referenceanswersandscoringcriteria

First,fillintheblanks(1pointsperminute,30points)

The1.lawsofmaterialstructureobservationandexperiment

2.m7.5*10-5minutes(min)mmmL

3.2.802.8cm0.00cm

4.tonetonetoneloudnessloudness

Interactionbetween5.magneticpolesNorth(N)

6.twolikechargesrepeleachother,unlikechargesattract

eachother

7.theamplitudeofthevibrationfromthesoundsourcedistance

8.noiseelimination,soundabsorptionandinsulationtoreduce

noisereductionofsoundloudness

9.negativepositive

Two,multiple-choicequestions(3points,30pointseach)

Ten

Eleven

Twelve

Thirteen

Fourteen

Fifteen

Sixteen

Seventeen

Eighteen

Nineteen

D

C

B

B

B

D

C

B

D

A

Three,applicationanduse(eachof4points,atotalof20

points)

20.preventthesmallscrewdriverfrombeingmagnetized

21.nylonpantseasilytriboelectrification,chargedbody

lighttoattractsmalldust

22.softsnowattractssoundseasily

23.soundcannottravelthroughavacuum,playasoundeffect

Forexample,24.classstudentsbreakloudnoiseban

Four,experimentalresearch(4+4+6+6,20)

In25.(1)(a),thediameterofthecopperwirewithuniform

diameterisuniformlyandtightlydistributedaroundthe

uniformfinerod,andthenumberofturnsaroundNisD,then

L=N

(b)thenumberofcyclesaroundthesamelengthofthethin

copperwireofunknowndiameteraccordingtotheabovemethod

isN/,thenL=N//D/

(c)thediameterofanunknownfinecopperwire

(2)tofinecopperwirearoundtheuniform,compactandtwo

timesaroundthesamelength

The26.filmisproducedbythevibrationofanobjectinthe

vibrationsound

27.(1)ofironandcopper;aluminumsheet,glass,paper

(2)themagneticfieldcannotpassthroughthemagnetized

materialcanbe

28.astheairinthehooddrawsoutandhearsthebellbecoming

weakerandweaker,itcanbeinferredthatifthecoveris

evacuatedintoavacuum,thebellwillnotbeheard,thusthe

conclusionthatthesoundcannotpropagateinthevacuumcan

bededuced.

BeijingNo.4

Secondgradephysicstestpaperinthefirstsemester

Fillintheblanks(1pointsperminute,44points)

1.transformunit

(1)4.2cm=m.

(2)70mm=um.

(3)0.5h=s.

(4)54km/h=m/s.

Thefollowing2.mainunitsofphysicalquantitiesofthe

internationalsystemofunitsare:length:,time:

,speed:;basictoolsformeasuringlengthis

3.speedisthephysicalquantitiesofobjects;

thespeedisconstantandthelineisastraightlinesport

called.

All4.aresoundingobjectsin;relyonthesound

propagation.

Threefeaturesofthe5.toneis,,.

6.temperatureisphysicalobjects;theliquid

thermometerisusedaccordingtotheprincipleof.

Seven

Thetemperatureofboilingwaterin1standardatmospheric

conditionsfor,temperatureoficewatermixturefor

8.geostationarysatellitestothegroundasthereference

satelliteis,inthesunasareference,thesatellite

is.

9.substancefromasolidtoaliquidstatephenomenon,called

;sublimationismaterialintodirectlyby

phenomenon.

Themaindifferencebetweenthe10.crystalsinthemelting

processandnoncrystal:crystalandnoncrystal,no

11.acarthatmovesataconstantspeed.Ittravelsby2min

at6km,sothecartakessinthelast300mofthe

journey.

12.whatkindofchangeofstatedoesthefollowingphenomenon

belongto?

(1)thewinter,peoplebreatheoutwhitegas,

(2)castironframe,

(3)thefrozendryclothes,

(4)themorningfog,

(5)thegroundwaterisquicklydried,

(6)inthecoldnorthpeoplegoout,frostwillappearonthe

eyebrows,

Theuseofliquefiedpetroleumgas13.life'smethodisused

inthecompressionvolumeandtheliquefactionof.

The14.factorsinfluencingtheevaporationspeedis,

and.

Therearetwokindsofand15.liquidvaporization

way.Iscalledinvaporizationoftheliquidsurface;

anotherwayisinthevaporizationvaporization

temperatureonthesurfaceoftheliquidandoccurat

thesametime.

The16.methodshaveliquefiedgas,

Two.Multiple-choicequestions(2pointsforeachquestion,36

points)

1.takethemixtureoficeandwaterintoaroomat5degrees

centigrade,andthetemperatureoftheicewatermixturewill

(or)increaseasthequalityofthewaterincreases

A,B,constanttemperature,lowtemperature,CDcannotbe

determined

2.sittingintheboatonthemansaidthathewasstill,his

chosenreferenceis()

A,B,C,riverriverboat,heD

3.anewpencillength(about)

A,0.18mmB,0.18cmC,0.18dmD,0.18m

4.a,Btwocarsdouniform1inearmotion,inthesametime,

acarthroughthedistanceis3timesthecar,thenthespeed

ofacarisacar()

A,1/3,C,3timesBtimes2/3timesD,3/2times

5.weusuallysaidthesunrisesintheEastandfromtheWest

down,referenceisselected()

A,B,C,sun,earth,treesD

Thefollowing6.groupsofstatechanges,isanexothermic

processis()

A,melting,liquefaction,sublimation,sublimation,

solidification,liquefactionB

C,vaporization,sublimation,melting,melting,vaporization

andsublimationofD

Thecrystalbelongstothe7.ofthefollowingmaterialsis()

A,B,C,ironrosin,asphaltglassD

8.themistakeinthefollowingstatementsis()

A,B,voicesoundcantravelinasolidcanspreadinliquid

C,D,voicesoundcantravelintheaircanspreadinvacuum

9.fourpeopleusethesameminimumscaleasamillimeterscale

tomeasurethelengthofthesameobject,andwriteoutthe

measurementresultsasfollows

A,54mmB,5.40mmC,5.40cmD,0.54dm

10.a,B,twocarsaredoinguniformlinearmotion,adriving

inthe1H18km,BdrivingintheImin600m,comparethespeed

oftwocars()

A,acarB,carC,BisaslargeasD,cannotbedetermined

11.measuringthewidthofadeskwithascale,thedatarecorded

is0.543m,andtheminimumscaleofthescaleis()

A,ImB,1dmC,lcmD,Imm

The12.is100DEGwatervaporratiois100DEGwaterscaldburns

moreserious,(because)

A,watervaporthanwatertemperaturehighB,watervapor

liquefactionabsorbalotofheat.

C,watervaporthanwaterfastheattransferD,watervaporto

releasealotofheat.

13.therearetwothermometersforaandB,andontheglass

bulbofthethermometerB,thecottonsoakedwithalcoholis

coated,andtheindicationofthetwothermometersatthistime

iscompared

A,athermometershowsthenumberofhighBandBshowsthe

numberofhightemperature

C,a,BtwothermometershowsthenumberofthesameD,cannot

becompared

14.objectsfromAbyBtoC,ABConthesameline,themovement

ofobjectsismoreandmoreslow,BCdistanceis5m,BCobjects

bythetimeis2S,thentheobjectfromtheAtotheaverage

speedofC(maybe)

A,2.5m/sB,Im/sC,9m/sD,cannotjudge

15.usethesamescaletomeasurethelengthoftheobjectthree

times,andrecordthedataof45.30cm,45.28cmand45.31cm

respectively,thentheaveragevalueis()

A,45.297cmB,cmC,45.30cm45.29D,45.3cm

16.hypomeltingpointis48DEG,48DEGC,Hyperionis()

A,mustbesolidB,acertainliquid

C,ahybridstateofD,threecasesarepossible

Thefollowing17.phenomenabelongtoliquefactionis()

BoilingA,thefrostformationoficeB,C,D,theformation

ofdewwater

18.ascaleoutofthethermometer,putitintheicewater

mixtureshowsthenumberof-2(C,intothestandardatmospheric

pressure)showsthenumberofboilingwateris96degreesC,

useittomeasuretheroomtemperatureis26.8degreesCelsius,

thetruetemperatureis(indoor)

A,28.3B,27.3C,cc29.4CD,unabletodetermine

Three.Judgmentquestions(1pointspersubject,5points)

Waterat1degreescanalsoevaporate

In2.theiceishigherthan0DEGC,melting(to)

3.aslongasintheexperimenttooperate,averagingmultiple

measurementscanavoidtheerror()

4.usingascaletomeasurethelengthoftime,estimatedmore

bitsread(better)

Theboilingpointofwateris100to5.DEGCto100DEGC,so

thewatermustbeboiling()

Four.Experimentalquestions(1pointsperminute,5points)

The1.blockslongcm,accuratevalueestimates

2.athermometershowsthenumberis,

Bshowsthenumberisthermometer.

Five.Calculationquestions

1.(3points)astudentridingabicyclefromhometoschool

need20min,ifhisspeedis5m/s,howmanykilometersawayfrom

hishomeistheschool?

2.(3points),apersonshoutingtothecliff,after1.2sheard

theecho,howfarawayfromthecliff?(thespeedofsoundin

theairfor340m/s)

3.(4)aandBtwoathletesinthelong-distancerace,behind

aB100m,knownataspeedof27km/h,thespeedofBis6m/s,

aand500mfromtheendpoint;ifaccordingtothisspeed,a

canarriveattheendpointwhencatchupwithB?

BeijingNo.4

Mathsweekendexercise6(Pythagoreantheoremofinverse

theoremandapplication)

Weekendexercises:

1.arethefollowingfourgroupsforatriangleside:

(1)3,4,5(2);5,12,13(3);8,15,17;

(4)4,5,6.ofwhichcanformatriangle(a)

GroupB.3,groupC.2,groupD.1,groupA.4

Thelengthofthe2.trianglewereA2b2,2Ab,A2b2(AandBare

positiveintegers),thetriangleis()

A.B.C.isanobtusetrianglerighttriangleacutetriangle

D.cannotbedetermi