ACT Past Papers with Answers

MILrc tliL rc%ults of (he expcriinL'nt% con.4i.41eni willi ilie rL'.5eiirLhL'r.4' prediLiion? r. YL'.4; in Lach experinienl. i)n averab7C, the .spidLr.4 alL ilic 4Jme nuiiibcr of criLket% of C&iLh color in I hr. aiL' m()rL blue LriLk-cl% ilian LricKel4 uf any ather ljl,L•ll Liil(Ir in I l)r.

Ivhai was iliL lol'al nuiiiber c)r_spider.% needed ic) cc)ii- duLI ExpcriiiiLnl% l-.1 ') i()0 ji. ?()()

A .%iiidciii iV&inied lo JL'ILrinine if ihe rL.suII.% r(Ir wil(l. Lauglii %piJer,g le%lLd ,4111)rily afiLr ihey w'ere QaPiuic(I i'c)Iild bL ihL %aTnL for dirrerLnt .%PCLie.4 of prLy. WhiLII L(?nLIuLI'. RLPLai ExpL'riii)enl I willi A. Il(piiie.sli('Ii.I ;L% ilie SPL'L ie4 1)f pre},. RLPL'&'il EXPL TiTnenl l iviili fl. clciiiie,Ific'ii.i ihe peLiLS L)f prey. FI. RLpLUI ExpL'fiiiiLint l iviili u .%pecio% ()1" prLy C)IhL'r RepL'di Experi iiiLni l N. lili a ,%PCLiL.4 r)I' prey c)IhLr Lhdn il. (IuiiiL'JIIC-11 I.

The Ila%k ivaN imniLr%Ld ii) lin ILC IV411L'r baih, In eiich tri:Il. lh¥ followingT sieP4 wcrL PLrforniLd: TIvLnty InL ()f Al. [yiiiiiiilLi rjil ivd% Inixed wilh 81) niL ()r iiieih41n()l in J IlJ.%k lo Ic)rm a solution. and thc perLLnl¢i<ie i)1 ilie fvl. piiiiicifii oil ili.ii had l?Lin L()ni'eried i() biL)diL.)Ll l LIL'I IV41% LalLU IdlLd. Fi)r &iny &vivcn c()nibiniltion cpl. L'nndili()n% {iilenlil) (>l' L&ild- ly%'t, L()llLLntr,Ition ol" LJtal}'lit. aiid niiLroiv'ive iimL). 4 iri'ils ll'ere LunduLied. TIIL l&iblL shuiv%, for LaLli 4et c)r Iri dl%. IIIC L KPLri inLnliil ii)nditii)n% iiiid Ihc 411 Lf&l4Te pcrLL ni cil" th¥ ()il Ihat LonN'Lri¢d io bi()die.%cl fiiel. ? A paniL'ular mas% ut. a LdiJly%l Lither %c)di uiii hydri)K- idL (N&iOH) (Ir piitLI.%%iuni hydrnxidL IKOH> wafi dii•- IvLd in ihc flask. Catalysl Luncenlrali(In (pLrcent by AvLfdL¥C perLLnt ()I' l. piiiii<il(l ()1 I Lonverted i(} biodiesL I I'uel MiLfoiviive tinic (Ininl Sel or triiils cataly.si NJOH NaOH NaOH KOH KOH KOH (1.5 )-1? 13-16 17-?() ?1-?4 ?5-?8 ?9-3? )6.()

Which of the following .%iaicmcni.% 1.% bc.%l %upporled by Ihe re,4uII.s of Experimen1% l and ? ? Afier the wil(L Laughi .%piders had been K"epi in CagTet• I'or 4 iveek.s, they ale, on ¢ivcrage: rn()r¢ &vreen crick"Ll.4 in I lir ihun did ihe Idb()ralory- rai.4ed %pidL'r.%.

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Consider ihe re.suli.5 ILif L'¢lLh Lombination (If Latalyst concentrdlion and miLfoiv(Il'C tinie ihat wa,% tcst¢d. Coinpiircd V*'iih thc ai'era&Tc percent of A4. Pllllldl<i oil con¥'crted lo biodiesel fuel in ihL NaOH irials, Ihe ai'era&ye percen( of M. i)iiiiiafu oil coni'Lrled to bio diL.sel fuel in ilie KOH trial,% ivJs: 'alwuy% higher. alway.% lower. always the %amc. %()mciime.4 hi&iher and .8ometiine.s lowL'r.

reiver &Treen LfiLkLl% in I hr ihan did ihL I'abor4ilory- rui.scd spidcr.%. ni()rL' Lrickei% in I hr thdn they Llid whLn ilicy l)ad rL'LL'nily bL'en LJPlurL'd I'i()tn IhL ￿ ilLI. reLenily bL'en Lliplured I ri)m thL' ild. ACT.OP4 39 GO ON TO THE NEXT PAGE. 40000000004 Passage11 ThL Indidn bLLLh trLe (IllillLIIi(I Plllllllld) producL'% oil-riLh .¥eLd.s. The (jil 1.4 inediblL: howeh'er, il Lan be clin- LrtLd in l?iiJilic'.sc,I fEiel in d chcmiLJl re(ILtii)n iviih mLihanol (41 .S()Ivciii) and u Latuly,4l. SLicntisls hiudiL'd thL produLlioii ()1" b i()d iL.%LI fuel fr(Iiii fvl. piiiii<iiu i)1 I, l. ThL Ilask wa% (IiiLd ii'iih J ILnipLrJlurL' pruhL'. SLiilLd, plaLL.d in a miLrol￿alc cJVLll. &illLI ihLn niiLfoKi ili'ed until Ihc LoniLllls rcaLheLI fi() C. PJrliLular cininu nt lil l i ML (tliL Illlc niii (ii'É' liiiic, l.

The avLfa&iL PLfLent of M. i)iiiiicif(i oil conN'cried io biodic%el fucl in Triuls ?5-18 dirrercd from Ihal in Trials 33-36 bec'ause the ? %ets of trials differed wilh re%pect io ihe: idLnliiy of ihL Lalalysl. conLcnlrJli()n i)f ihc C&il(I ly%t. miL'rowuve time. iemperature di which the nd%k wa% m<iilliained. NaOH Il. NdOH KOH KOH

For the trial.s conduclLd wilh l.0¢70 KOH by masN, Ihe microivave timc increil.sed. tlie ili'eriige pcrcent of M. piiiiiiild oil ci)ni'erted to biodiesel fuel: increased only. increa4ed and ihen decreased.

N(): in LaLh experiinLni, on iiNcra&7c, the .5pidcr.s ale the 4iiinL numbcr c)r crick'LLs c)1 Lach c(Ilor in I hr. iiii)rc blue LriLkets than LfiLKel% of iiny ()Iher &TiYen Liil()r in I hr.

Based on Table l. in DJllas, Ihe ioiiil CDD wu5 approximalely how many limes dLS gre¢lt a.4 ihe lolal HDD? o 6,000 U 4.000 ?,000 10 Southcrnmost Nortliernmo%l lalitude l O,O(K) o 6,(MX) U 4.0(X)

As,%ume Ih&il on a pariiLulJr day. T 65°F. For ihis da5,. whilt HDD viilue would bL Lalculaied and what CDD I'dlue would be LalLulaied'? HDD CDD ()

Source question 19. Refer to the source image.

Con4ider the HDD equaiion Jnd ihe HDD irend line shown in Figure l. The %lope of thal trend line ncgJ- tive. which indicalcs ihilt. oi'er thL ?6 yr period. Ihc 411'cra&ie Vdlue of Til inLrea%ed only. remained con4iani. .1. decrca.%ed 41nd then inLrea.%ed. ACT.b)4 43 GO ON TO THE NEXT PAGE. 40000000004 Passage IV The am()L bil Ciiiciiiic)el?ci lii.¥l(Ili"li cci Lan i n l LC i I hL' human digTe.%iive iraLt. Scienti5t5 c()n(IuciLd ? LxpLriments ti) %ludy (he (iiiioc.bic'idul (amiicba-killingvl dLliI'lty lif hunian niilk. SS in Nfvl La%Lin in Nfvl lipid% in NM ii()nLd4Lin pniieins in NM Ten milliliiLr% uf a niixiure ol" iiiilrieiil IiiL'<liiiiii (NM) and .iuliiiL' Jiiliili<pii (ss) Ihai was 5(AI SS hy i'()lunie pui in J tesl tuhL. Thi.5 proLcduie perform¢d tlViLC mi)rc, except that the perLents' by volumc i)r ss WL'rc IO'/o and l jf/o, respectively. Tcn milliliiers of only NPYI wagi pul in a fourth ie%t lubL'. Nexl, I x l{} E. lii,slcJli'li<<i H'ere uddcd io each ic.41 tiibL. ThLn. J .4eLond 4L¥I nf ie?ii iubLs wJ41 ik'ewihe prLp41rcd. excLpt ihai human milk %ubstitulLd Inr SS All 8 te,st tube8 were incubiiled di 17°C fL)r I l)r. At thu Lnd of inLubation, thi i)erL'L'iil siiri'ii'(Il (pcrLeni of ihc 41ddLd test tube (sce Fib7ure l ). i(M) 81) 6() 41) i nLLib4iiion iiniL I hr Figiure Figures adapled Iiom Nidia Leon-sicalros el al., 'Amoeblcldal Activity of Milk, Apo-lacloferrkn, slgA and Lysozyme.. @2006 by Marshfleld c1￿1c ei. SSinNM C] hum¢in milk. tn NM 100 80 IlllITI

Source question 22. Refer to the source image.

SuppiisL ihdt iin inLub411iC)n lime ul. l? hr had been ie4lLd in Experiment ? ThL perLLnt .%urvival of the . Iii.sr(Jlilic'ii in the ie.41 tub¥ Lonlaining lipid.% in NM w()uld mnst lik'ely have been Llo%es1 lo ivhiLh of ihe r()IloiYing values. ri 44 GO ON TO THE NEXT PAGE. 40000000004

WhiLh of the following qucsiion% werc ihe 4Lienii514 mo%t likely aiiempiing lo an.siver in ExpL'riment I '? SS and F. liisli)Ii'lic'ii expo.sed (o humiin milk alfecicd by incrca.siii&i incubaiion tinic frc)m I hr i() 3 Iir SS dnd E. Iii,Ilcili'licii eKPQ.4ed lo lipid% 'dffcLlcd by increasing inLuliiilion time froiii I hr lo 3 hr'l exp(?sed io ihe cJ,%ein frJcliun differ frc)m the per- Lent %urviv¢il for E. Iii,¥li)li'licii expn.lcd to thc ipids frdction,. Doe.% ihL percent survival fnr E. liislfjli'iii'u expo.4L'd iu liuman milk dilTer froin ihc perLcnl sur- vii'al for E. lii.1lnlYlic'ii cxpn,scd to SS 'P

In ExperirnLnl l. the dye iri'i)ciii l)Iiie wtL% added i caL'lI IL',41 lube Jl the Lnd of incub.aiion. Dcad E. Iii.%- If?l}'IlLli are .4iained by irypdn bluc; lil, In￿ E. Iii.rlcili-fiL'u are NOT .%lained by trypiin blue. Approximiilely whai pcrcent of the E. lii,%ff)l)'liL'ci in Ihe lost lube containing IOCI hunian milk in NM were slained hy ihc irypan blue.:

Tn bcst comparc the umocbicidal KILlivity of eiich of IhL 3 human milk fruclii)ns le51ed in Expcrimeni ? io ihe amoebicidal aLliVity of human milk ihai hag noi been separJted into Iractinns, thc scienlisls should repeat ihe procedures or: ing a Inixture of NM and nonciisein prolciiis in trach .4Ct uf ie%t tubc.%. ing li mixiurc of NM and human milk. in euch set of test lube%. ing ￿ mixiure of NM and nonca,%ein proiein.s in cach .4ci of lest tube%. .1. Experiincnt ? except include J te.sl lubc cDntilin- ing u Inixiure of NM and human milk in cuLh scl of iesl lube.s.

Source question 29. i.%led of a sinuylc type of charged particle. If Stu- dent ?'5 explunulion 1% correct, these pJriicle4 were most likely: clectrons. ncutrons. '(._) '(_';) Yandy

Baged on Siudeni I's explandtion, when the %wilch on Ihe ILI't W4iS in Po.sition X and the swilch on thc riLht was in Position Y. werc the eleLiriC field.s &venerJted by Ihe current.% parallel ur ontipardllel? upwarLI. downwurd, riowinbi upward 41nd the ri&?hi.h4ind current Wil nowin& downlviird. D, Aniiparallcl. becau%e ihe left-hand currLni wa.g nowingi downward and ilie righi-hand Lurreni wa. r]owinbF upward.

Which c)f the following figures is consisient with both Figlure ? und Studcnl 3,5 explanaiion? ,,) (,' .) (;' Xandx Xiindy

In regard io attractive und repulsive interactions, how does Student 1,5 explanalion differ from Student ?'s exp14Lnalion? Student I claimcd Ihilt: a field attrilcis or repe15 unoiher field, whereas Stu- dent ? claimed that a field attract.s or repe14 charges. field atlrdcls or repel.% charge.s, whereas Siu- dent ? cl4iimcd ihat a ficld uttracts or repels another field. Lharges aiiraci or repel fields, whereas Siudeni 2 claimed ihat charg?es allTacl or repel other charge.%. chiirges aitract or repel other charges, whereas Stu- deni ? claimed Ihat charges aiiraci or repel fieldg.

Which of ihe following procedure% ivould best tesi Stu- dent ?'% explanation? With curreni flowing thr()ugh I of the cables, determine if: a po%itively charged plastic rod, when held ai rcst near ihe cable. atlracts or repels ihe cable. a Lompas.s needle is defleLted whcn brought near Ihc cable. an unLharged rubber 4trip, when held at re4t ne:Ir the Lable, bends toward or away froTn ihe cable. a lightbulb is illuminaled whcn conncLled to ihc Ldble. ACT.VJi 47 GO ON TO THE NEXT PAGE. 40000009004 Passago Vl At CTP. thL' air abc)vc an aquLou% %()liitinn in a Llci.sed container h41.4 J constani RH. Fibyure 3 shows, for .3 cofft- pnunds, hc)w' Ihc RH ol IhL dir ill CTP in ll cIo.%Ld c()nlainLr vurie.% ivith the pcrLcnt by mJ%*• ol. thL' L(Jmpound di%.4olvcd in ihL J4ilL'nUN %olution in IhL' Lonl'.iinLr. FigurL l .%hows how the H:0 i'£ipiii- pre.s,iiirL Iihe prLS- l¥ure exeried by the H:0 i'iipor in iiir) vurics ￿'Ith the rel&l- live humidity (RH) of ilie air at CTP, which dLn()le.% a constJnL iempLraiure of ?.fj°C dnd pregsurc of l()1.1?S pas- Lal% (Pd]). FigurL g show.4 how thir den4iiy varieli with H:0 Vlipor pr¢4sLire ut CTP. ki:so, 80 -1.500 L* 6( Cacl, ?,(x)o 1,500 10 ?[} 10 4() 50 60 7() pLrLcnt b), niasli ol'L()nipound in .solution 5(10 FigiiirL I Figuie 3 adapled Irorn James G. Speight. Lange'5 Handbook ol Chemislry, 16th ed. 2005 by McGraw-Hill, In¢, ?0 40 60 $0 100 RH ((Tr) FiLTurc I

B41scd on Fi&vure.% l and? ** 41.% RH inLre41.se.4 from ?0 lo 80Yf at CTP, iiir dcnsity: incrL'a4L% only. incrcii%es. thcn dccreaics. 1,176 1,174

Ba%ed on Figure ? air ai CTP iliai hu% a densiLy l)t

ALC(Jrding io FigurL 3, at CTP, if pure H:0 1% kcpi in a closed coni&iinL'r, Ihc RH of tlic air in the L()niiiiner ivill

Ba.%ed ()n Figurc ? will J l L %iimplc ()r siir ui CTP havc u grciiier iiiass it li ha5 an H:0 v'ap()r prL.4%ure or 1,000 Pa Iir il. il ha.li 6in 14.0 v'dpi)r prc.%.surc c)r 2,UOO Pd '1 ?,IX)O Pa, beLaU4C il will be Ics.s dense. ?.(M)O 1)41, beL£lUSC it will bc Inurc dcnie, END OF TEST 4 STOP! DO NOT RETURN TO ANY OTHER TEST. AcT.B04 49 Scorlng Keys lor Forrn B04 Use the scoring key lor each test lo score your answer document lor the multiple-choice tests, Mark a .1" In the blank for each queslion you answered correctly. Add up the numbers in each reporting category and enter the lotal number correct for each reporting category in the blanks provided Also enier ihe loki number correct for each lest in the blanks provided. The total number correct for each test is Ihe sum of the nurnber correct in each reporting category,

Coiisidcr a 35¥0 by mas.s aqueou.s suluiion of H:SOJ in a Llosed conidiner. Baqed on Figures 1-3, if ihe air aboi'e ihe ￿0]Ul10n in ihe Loniainer is al CTP, Ilie den- ,%iiy of iliL air will be closest lo whicli of the foll()wing. C, 1.118 glm,