c sec january physics 1999 paper 3

7/29/2019 c Sec January Physics 1999 Paper 3

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CA RI B tt F]r\ N EXA IVII I.{AT IONS C]oI]NSECONDARY EDUCATION CERTIFICATEBKAI\TINATION

PHYSTCSPaper 03 - General proficiency

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I hourll JANLJARY 1999, (a.m.)

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In atltlitiou to the I hour, candirlltes are allolverl a;A?ifnFlilre ol l{l minutes. tVriting rna-v begintltrrinq the l()-rnirrrrte pt:riocl.RT|A I)'I'I I E I-OI-I.O\\'ING DT TtEC'f IONS CA RI'I-ULI,\'

Ausrver ANY l'HREE, qucstions,A,LL WORKING MLIST BE SFIOWN in your ans'v'cr hooklet, since marks rvrll be arvudgd 1i,,correct steps iu calculatiors.tThe use of non-programmable calculators is allow,ed.lvlathematical tables are provided

I)O NO'f 'I'trRN ]'ttTS PAGI' UNTTI, YOU AIIE TOI,D TO tX) SO

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Copyright @.,.;OOZ.I93/F/JANUARY 99

I 998 Caribbean Exaninarions Council.All rights reserved.


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E,xplain *'lrrrt rs rrrt.Lritarr:rnged rrs irr l"igtrrc by a ttt;tqrtcf ic ilclil. In 1,our altslver irooklct, drrrrr rrr Lr blir ru;i{uc,il. artcl sketch tlrc rrragrretic lield pattent arourrd.rntl rn l:ctrr.tr,n tlrt,rn

I'igure tAn iron bar is placed near to a coil ;u shown in ligure 2.

= Mgrronbar =It l. igrr re JA str:atlv Lulri.'nf r\ [)ii\ic(l thrtrtrglr tlrc c'oil State and expltrirr tltc cltc-r;t prr rlic lrr]ii ir.ri

( li rrr;rrkr r,ht l.'igure.Jhi'1.'.-i rf11r*stltepirnsof anlctcrrvhichnreiLsurcselcctrrr (i.lni:ilt.-l - --.. -- - t., l'1__1 _.,I\

t\ - iVluving iron bar.-t--- Fixcd iron bar,i Coit,l-'- ' - SpringPoin te r

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Ampcres (A)Figure 3

The current tlows tlrough a coil. Inside the coil there is a fixed iron bar utd a seconcl ironbar which is att:tctted to a pointer. ,{ spring is also attached to the pointer. When currelrflows in ttre coil thc pointi:r movds rrcross the scale aml then conles to a stop(i) Explairr rvhy the pclinter nr()ves rvhen current tlows and rvh.v- tlrc pointcr stopstnclvlllq lt zr particular scale rcarling. Explain rvhy the pointer nl()ves firrther betirrcstopping "vhen the current increases. Write down the re,rding on the nreter r)nI,'igrrrr 3.

(ii) Catt irltcrttating Cuirettt be rrtcrrsured rvirli this meiCr? Explain yorrr ans\r",er !Vlr,r'shoukl !,orr not pass a cuffent greater than 10A through this nreter'l( t2 nrarks )

"['otal 20 ntarksGO ON TO Tt.iE NIIX'| PAGE


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).. Distirtguish lrcIwcen energ], lnd lxrrvrr arrtiquantities. Explairr rvIrlt rs nlctutt l)\' rt.ork ;rrrrlare the lrrain enctgy transfirrnrati()ns tltilt ()c:cLrr(r ) a persou r.valks up a tlighr oi sririrs(ii) an electric moror raiscs an oh.jcct'l

\!'fltJ irn crlLlall()rl rcltitrrrg thc:c trgrirvitatirlnal poterrtiirl cnerg-!' Wlrv tre rt

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( .l rnark-l'otal 2() rnark

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A girl of fiuss 4-i kg wdKSffivly up a tlight ol stairs to rhe nexr tloor inhotel. Each step is 0.24 m high and there are 25 steps. Horv nruch r.vork cloes sdo agairut graviry? [f it takes her 2 [ s ro reach the top, u'hat is her average p()woutptrF --= ( 5 rrrarkOn arnother oecasion the girl nrns Ll[) rhe stairs in t2 s. f{ov,,. uruclt w,ork dr.she now do it!:ainst Sravitv ald ',r'[ut is [cr uvcrage powcr gutput, ( -l ntirrk.Thehotel lrasanelcvatorof ruass2-tt)kg Il,insteadof usingtltcsrairs.the,rclee:idcs to t.tkc lllc ;tcvatrtr. * h;rl rvtrtrltl be thc: total rvork done aqairrsr srl\by the elevator tttotor'l Whur is tlrc cflicicncv ot using tltc elevator,,v[crr it.being used ro lilt onl,v the sirl '(Acceleration due to grirvity = l0 nt s-l r

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[ijlllifi ?:j::: i,iiil I:i, il,,, ],;;":l*ff; ;::xptaitl ltorr 111e property.support.s the tbeory. Dcscribe tlre !1r1111g,s tj,trhlc slir\pennlcrlt irnd stto,"v lrorv tlus exp"ri,t,"nt support-s l rv,ave tlleon, of li.qltt.( tl marks)A n.observer irr a buitding looks down at a s wirat the b'tto.t .r the foot pru,tu.", , .i;i" ;iitTl,-"?Ti:1li:i::: ,ilii,:tices trtara ra'tp

l,'igure 4Copy Figure 4 and adcl the paths of THREE ra.vs leaving thc lanrp rvtric. strikehe surt:rce and continue. ihoor" l*, *r, so that

ray I has rur angle of inciclence of zeroray 2 ha-s an angle of incidence of aiout U -S"r;ry 3 has an angle or inciaence oi uiou, OO ,,.tThe.critical angle tbr the water-air bouudary is 49, IState rvhich of these rays would be visible above the surface of rhe w,arer.

(iii)(ii)

Explain why a circle of lighr is seen and

Air

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find the refiactive index of warer(I2 markstTotal20 mark.s

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002493/F/IANUARY SC)


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.\ tirrcc-pin pltrg ha-s live, treutr;rl lrrid c;Lfilr !\ lrr's .r{tirr'lr,-'ri \\''lurl r. tllr l)rrPr)the ear-tlt w'ire.) 'ftr vvlrat is tlie orircr end ol this clrtit * irc ut{rrt:ircrl .ind wtratktterrtatiortaI Colour Code'] What is the pLrrpose ot'a tlrsc .tttcl *'i1y is rt particrrciiutgerous to travc atl eartll wire littcd to an appliilnce ''vitlioLrt a l'u.sc'/ Wlrat is ttre naod lntemational Colour Code tor tire ivire into w'hictr tltc fuse is titted'l ( ti rnaAnelectriccookerdrawsapowerof g.5kWwhenall burners areheingused lf thecois operated on a 220 V supply, calculate the current that it draws when all bumerbeing used. 'lhe cable that is lls,gAto connect the cooker to the'tllains supplyresistance oi0.036 C) rn-t. tf th6'cT6le is l5 rn long, ciilculate its total resistance anpower lost in this cable when the cooker is drawing ttt;.iximunt porver. ( tl maElectrical energy has to traveI considerable distartces lroltt powcr strttions to our holf the porverstation was t-5 k:rn tiom yotrr houre and rhe sanle typd of cahle ils abovewhat would be the total resistance of the transmission cable'l The ltouse needssupplieti with 220 V in order to operate the cookcr. What rvttuld the supply voltage ap()wer stati()tl rlced to be'l ( -l rna

I ottl 2{} rnaState TLTREE dift'erences between hoiting and evapora1i1r11. [,ise the kinetic theoexplain horv evaporation can take place at all tenrpcr;rturcs but ()ccurs nrore rapidiLigher temperatures. Why is there a clrop in tctupcrarurc rn a hquid when revaporati0n occurs'l ( 8 mr

(b ) Fottowing an accideet. a patient of rnass 70 kg requires ttre transtbr of 2 kg of L'lood.blootl is at 5 "C when trarst'erred to the patient iurd is rvarnred up to the patient'stenperaRrre of 3-5 "C. Calculate the energy triurst-erred fronr the patient's body tobtoocl. Find also* the change in the patient's bociy tenlperature.This temperanrre change may cause 'shock' and to prevent this the patient is rvrap. in a 500 W electrically-treated btanket. How long would it take fbr the patient's btemperature to be restored to its initial value?It is founcl in practice that it takes more than the tinte calculated io'r", fbr the patiebody temperature to be restored to its initial value. Account for this difference.(Average specific heat capacity of blood = 4 500 J kg -r 6 -t 'Average speciFic heat capacity bf bocly tissue = 2 500 J kg -' K -') (12 ma

Total 20 maEND OII 'TBST'

(b)

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OO]'19_]/F/J ANUARY 99

c sec january physics 1999 paper 3

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