Nsejs Paper_24.11.13

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lndiqn Associqtionof PhysicsTeqchers unapn .EXAMINATION FxaMlN IN JUNIIORSCIENCE2OL3-24L4 NATIONAL STANDARD Date of Examination24th November 2013 Time: 15.fr) to 17.00 Hrs

Pleaseread the instruction carefullybefore answerirlg TO CANDIDATES INSTRUCTIONS o n t h e a n s w e r s h e e t , f i | | u p a | l t h e e n t r i e s c a r e f u | | y i n t h e s p a c e p r o v i d e d , o N L Y | N information B L o c K C A Pmay I T Adisqualify L S . U s e oyour n|yBIUEor-B[ACK incorrea lcarelesslyfilled BALLpENfor makingentriesand markinganswers.Incomplete'/ candidature. will sheet(in the spaceprovided)'othenrviseYouranswersheet write the Q, P. CodeNo. mentionedaboveon YouR answer NOTbe valued. questionhas4 oplions'out of whichonly one is correct'choosethe The questionpaperhas80 muhiplechoicequestions-Each the.answersheetasshownbelow: box correctanswerand shadethe oval in the coriespgnding on

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Acorrectanswercarries3marksandlmarkwi||bedeductedforeachwronganswers'-

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A||roughworkmaybedoneontheb|anksheetprovidedattheendofthequestirrnpaper.

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PtIAsEDoNoTMAnEAT\YIaREShTHERTEANSHADII]GtN:fHEsPAcEPRr,Z',DEDoNTHEA|tswERsHEEI.Arrswer ls HoT AIIOWED' OFEftlTRY CHANGE sheetsare evaluatedwith the help of a machine.Dueto thb,

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THEBACKOFA'IISTA'ERSH€ET' may result in wrong score. DO NOT WRITEANYTHINGON scratchingor ovenrrrriting

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calculatoris allowed' Use.of a nonprogrammable on our website - www.iapt.ort.in by 3oth Norrcmber 2o13' The answers/ sol,tiom to this question paper will be available & AWARDS CERTIFICATES

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lndian Associotion of Physics Teochers NATIONALSTANDARDEXAMINATIONIN JUNIORSCIENCE 2OL3-20T4 Totaltime: 120minutes

Marks:2210

Onlyone out of four optionsis correct 1) One side of a glassslab is silveredas shown in the figure. A ray of light is incident on the other side at angle of incidencei = 45o. Refractiveindex of glassis given asl.5. The deviationof the ray of light from its initial path when it comes out of the slab is {Given , .'=6 = 23"; sin-' J

(")s"

(b) 180'

2) Thenumber5J41lies between a) 29 and30 b) 30 and31

{d1+s"

(c) lzo" 1

c) 31 and32

d) 32 and33

3) Oxidationnumberand co-ordinationnumberof ft in cisplatinetClr1run.1, are respectively a) +4and2 b) +2 and4 c)Oand4 d)+2andG P€ssagefor Q(tl-5):In a field one summer'sday a Grasshopperwas hoppingabout, chirpingand singingto its heart'scontent. An Ant passedby, bearingalong with great toil an ear of pea he was taking to the nest. "Why not come and chat with me," said the Grasshopper,,"instead of toiling and moilingin that way?" "l am helpingto lay up food for the winter," saidthe Ant, "and recommend you to do the same." "Whr7bother about winter?" said the Grasshopper;"We have got plenty of food at present."But the Ant went on its way and continuedits toil. When the winter came the Grasshopperhad no food and found itself dying of hunger - while it saw the ants distributing every day corn and grain from the stores they had collected in the summer.Thenthe Grasshopperknew: lt is best to preparefor daysof need 4l

ln the passagegiven abovethere seemsto be a factual error with respectto the ant carryingthe food to the nest.The most probablereasonfor this mistakewould be a) b) c) d)

Peapod is too heavyfor an ant to carryto its nest. Peacannotbe carriedby an ant in the summerbecauseit is a Rabicrop. Ant couldn't have passedby easilysinceit is the favouritefood glgrasshoppers. Grasshoppers avoidcomingout in summerand thus there cannotbe grasshopperin the story.

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5) what could be the most plausiblerea.sonthat arfthe ants that LrrdL toited and moilr rolleo summer were happyand " qrIrr moiredin the content in *re winie;

withGrasshopper. ;i ffI I"T::??:j:[iffi:since theirroodwasnotshared

,|o?"l;:,-t;'"1lll,,'::' c) Ants were happv,in." t'"v o) *::: ";,Jrffi;n was efficienuy o,,i,iuu-,"""J;;; '#;"1',o,n",

[Tff:ured

6) Grasshopperwas at fault in this story a) b) c) d)

",,,n"

mostly because

Of its attitude towards ants who were working tirelessfy of not having a forethougni io ,to." food for the upcoming winter season. of chirpingand singingtJitsieart's content in the summer. ft shourdhave askj ;;;;; tn" rooa ;;;; to surpassthe winter somehow. "nJ

7) Anobjectom f ass1kgismadetoslidedownasmoothincrinedplaneof r e n gt h 2 o n t l f t h e kineticenergypossessed by the bodyat the bottom of the planeis 100-r thenthe , inclination of the planewith the horizontat is (takeg=10ms-2) (a) ls' (b):z' (c) oo' (d) ro' 8) Two circleseachof radius 3 toucheachother externaily in the prane.In how many circfeof radius8 be ptaced wayscana in the pranetouchingeach of thesetwo circles? a) 2 q4 c)s d)8 9) Which of these elements has the greatest electronegativity? a) Br b) N c)o

d)s

10) An inclinedplane of

incrinationg is pracedin water as shown in figure given below. Consider a small area (44) around point p at a depth . _ h. - 'lf 'Density - . . :of water is p and accelei,ation due to gravity is g the force experienced bydA due to hydrostatic pressureis

a) peh(AA)

tu 'TA:rt

b) pgh(AA)sin0

c)pgh(ae)cose

d) pgh(AA)sec0

- t' # + y -5'4x+ 2yarethesidesof anequirateral triangrgitsareaiscrosest to the

a ) 8 4 r .

b)8s

c) s6

d) 87

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514 12) ThepH of a 0.025M solutionof KOHis a) 1.50 b)3.5s c) 10.31

dl12.40

13) considerthe followingtwo statementsabout light &sound.choose the most appropriateoption (i) When light and soundtravel from air to water, light may bend towards normal while sound may bend away from normal. (ii) Sound is longitudinalwavewhile light is transversewave. a) Statement(i) is correctwhile statement (ii) is incorrect b) Statement(i) and statement(ii) are both correct and statement(ii) is not the reasonfor statement (i) c) Statement(i) and statement (ii) are incorrect d) statement (i) and statement (ii) are correct and Statement(ii) is the correct reasonfor statement(i) 14) lf xf =q3, y/=b3 ond zl = c3then I equals

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a)

r

4

0c'

--;a-

0'c

.. D) --; a'

r )

A

c+ ) d u

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15) How many H atoms are in 3.4 g of C12H22O11? a) 6.Ox1023 b) 1.3x104 c) 3.8x1022

a0' ---;-

d)6.0x1021

PassageQ {16-18):Diatomsare the most common photosyntheticaquatic microorganisms group of algaewhichare unicellularand can existas coloniesin the shapeof filamentsor ribbons,fans, zigzagsor starsdependingon the qualityof the water. Diatomcommunities are a populartool for studiesof water qualityand pollutionmanagement.Karthik from Bangalorerecentlywent on a field trip from Bangaloreto Mysore.on the way he stopped his car at a sewagecanal,a lake and a mountain streamand collectedwater samples from all of these placesfor his lab work. After a carefulanalysisof his water samples, he observed that diatomscamewith varyingsizelshapeand the size /shape increaseshas (have?) somethingto do with the water quality. I

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1"6)Beloware the diatomsobservedunder a microscope by Karthik.Helphim to recognise the correctorderof samplelocalities(Viz.,canal,streamand lake).

i,r*$

( n\ zz

ffiw R=\\-?ry *\ J:*1 +

,; {r

514 a) A- Mountain stream, B_ SewageCanal, C_ Lake b) A- SewageCanal, B_ Lake, C_ Mountain Strbam c) A- Lake, B- Mountain strearn,C_ SewageCLA d) A- Mountain strearh, B-,Lake, C- Sewqge canal 17) what is the take home messagefrom the above experiment

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a) Diatomscome in different sizesand shaoes b) The difference in size and shapesfrom different water samplesis suggestiveof the intensity of water pollution. c,l Karthik enioyed collectingsamplesfrom different locations d) Nothing can be inferred from the above experiment.

18) In the aboveexperiment,differencein sizesand shapesof diatomsshould be inferredas a) Differentspeciesof diatoms. b) Differentgeneraof diatoms. c) Differentfamiliesof diatoms. d) Differentordersof diatoms. 19) Thepercentage changein acceleration dueto gravity at an altitudeequalto radiusof earth comparedtothatonthesurfaceofearth , isgivenby a) 25%increase blgso6 decrease c) 75%decrease d)zs%decrease 2 o ) L e t g , b b e t w o p o s i t i v e r e a t n u m b e r s s u cahct h ba < t!

*atet x=(o*!l-{a+}).ft,"n

a)x is alwaysgreaterthan zero b) x is ahrayslessthan zero Q x=O d) l*o suchdefinite conclusioncan be,drawnaboutx 21) which of the followingspecieshasstanda;denttralpyor torr"itn as o'kj mol{? a) HzOtrl. b) Nala c) Na6y d)CO4d 22) A particleaccelerates wit-ha constantacceleration aeand reachesa maximumvelocityandthen decelerates with a6and comesto rest.Thepositiontime graphdescribing the situaiionir;"r; representedby Xinm

t L75

Xinn D'

lr5 E

oa

a.R

0.1'

*a

(a)

(b)

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Xinn 125

lt:

c;;

0_:t

(e)

(d)

23) Letm be the numberof distinct(noncongruent)integer-sided triangleseachwith perimeter15 and n be the numberof distinct(noncongruent)integersidedtriangleseachwith perimeter16. Then m+l equals al -2

b)0

c)2

d)-4

,

24) What is the molalityof a solutionmadeby dissolving100g of bromothymolblue {C27H2sBrzOsS) in 1-00L of ethanolon a winte/s dayat 1@C?'The densiryof ethanolat this temperatureis O.7979kgLL. al0.100mol kg-1 b) O.128mol kg-l c) O.160mol kg-1 dl O.201molkg-l 25) Two bulbsof specifications 50W,220Vand a 100W, 2mV are connectedfirst (i) ln paralleland tii) lryseriesacross220v powersupply.choosethe correctstatement .tlren ' (a) ln (i)50 W willglowbrighterand (ii) in 1m W wiltglowbrighter (b) ln (i) SbW wilt gtowbrighterand (ii) both wiil gtowequailybrighter. (c) ln (i) 100w wilt glow brighterand (ii) Sow wittgtowbrfiter (d) ln both casesthe 50 W bulbwillglow brightef.

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26) LetI be the numberof 4- digitintegers,each:ending in 3 (in unitsplacejand eachdivisibleby 11.Then al 7O