No. of Printed Pages : 15

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Time Allou'ed : 3 Hours ]

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4678

(gdlur..l , (r)

Note :

(i')(i)(i,)

(6):

(c)

u$loq erain

Register Number

PART - III

Srufr-9lu.ro / PHYSICS

( pL6l$ LopgLb gru8o org! / Tamil & English Versions)

WEfi ffi g*'Hg*Ea H.e*f@ I 6 Lorgp ,op u Gl uermsoir : 150

fMaximum Marks : 150

4xflqcor : (1) ela)6irp5l o6lennrisqg Lb eflurs u$e'.lndl zeironpn ^nt.*'P-**,fl ,-., n ffi a G o nc;ionIl o el &a u I $l o'9 eu 6at p u9l 6 u r-91 ein el 6D pB

sainsnalfl u u narflL-Lb zr-elrqulne$ Glprflo9&seqLb'

(2) $euLb etouer:gl a19uq arLougleoar Lor@GLo 6r(9gl6rpp(9u grr'reinu@pp

Gor ain@ rn L tl"a' areo r1erpp19 Glu einfle! I ueinr @$peq d;'

Instructions:(1)Checkthequestionpaperforfairnessofprlntinglfthereisanylackoffaimess, inform the Hall Supervisor imrnediately'

(2) Use Black or Blue ink to write and pencil to draw diagrams'

uggfl -ITranr-r

4ll5odulpgl orglarnris qgrig Lb or9len L-uerfl riseq Lb '

sfl u n6dr oElarr-seoeir Gpf$6p@$gl 6r(qgls'

Answer all the questions'

Choose and write ihe corect answel'

1. Gp ritie r$$ u9lein peinrSlein Stonro orain :

(er)"SThe self inductance(u) zeto

(+)Clqugldlof a straight conductor is

(b) infinitY

(6) + *omass 'mo' attains the

(.) 4 *o

rflo er$ob

very large

(m) grlofleS)velocity of 1ight, its mass

(d) in{initY

30x1=30

(r+) rflse4Lb Efltgt

(d) very small

z. eueq 6larp 'mo' Glsnaiuu 919 ulgLrGungeir gofl u9lein $lauGeus$$1cn G+einpner;'

etpetr ParPureng :

I -er) er6lWhen a materialbecomes :

(u) o

(+)2-oparticle of rest

(b) 2 -o

w1,ttM M EvE so B a$' eo s-tl [ 619"q* / Turn over

4678

$l grrein ar aoerru$ Glpn15$l u9 cfu senreunnrq$ pr(!rri;6 1b, pu6;19o,9lcl eueh+ri1gLir

$reoL-u9leb 6>19 Sl6n $n aoourisuurrnei, eueoenur$Glpng$l :

(et) agrar1gtb

(St) Lonprgl

(q) e$rflerarL-qLb

(m) gpe0cil o,9lrfloueo rq ri L9leinq a19m15Lb

When a drop of water is introduced between the giass plate and plano-convex lens in

Newton's rings system, the ring system :

(u) contracts

(.) remairs same

4. etglris1g rgloreoeu S6iadler; Clerofluu@G

(er) zoo ev (q5) 200 Mev

The average energy released per fission is :

(r) 200 eV (b) 200 MeV

5. E6&ungtb gseirsaflo ergi Glourneir +15Lb?

6. r6lebeslsein a.aiNGlemu:$5rofl gu-LoL1 Genpeoenu9lo rjleinqou$$lein $len+unem5 :

(er ) 6$rGPnri;61 Cl+uou@Lo

(g) GoeuGpnridl Gleu:eur@Lb

(6) Clp^51* GLoeuGpn&61q6 r-gleiirorn EBGpr&BqLb Cleuei'ru@b ^S

(m) gpesleu E$GpnridlqLb r-gleinarri GLoelGpn66qrn G+uer-ru@Lb &dThe direction of the electric field in Miliikan's oil drop experiment acts : {6-*(a) downwards ,^S-(b) u pwa rds q.$t(.) first upwards then clownwards

aF@-(d) first downrvards, then upwards

"$',,ds$

(b) expands

(d) . first expands then contracts

eTir+f1 q$peu :

($) zoo mev

(") 200 meV

( r,r,) 200 GeV

200 GeV(d)

( et ) ero6rYnein

(S) $lgL-pnc.in

Which of the following particles is

(u) electron

(.) neutron

(g) qGTnL,rnein

(n=) n -LEeneiir

a lepton ?

(b) proton

(d) T - meson

7. gofl zrdBal aor*Gunrqel e-rflpur@6 gaflu9ein ppLb erparerr& enriDpgr?

(et ) erpdr L9einGenn&Ee +rnq(g) geiirGemnrilg rd) einGenni_L__ elonor1

(6) etpein goeinGem.rtilg+ +nnq

(n') garp6sL-3i$l 6ungoflein erLars

The colour of light emitted by LED depends on :

(a) its reverse bias

(b) the amount of forward curent(") its fom,ard bias

(.1) type of semiconductor material

8. X -s$1ri gpnugleb Gouafluu@Lb X -s$riuoflein G1+flo,glarar ere!erngl.et$lsrfki;seunLb?

(.1) rd einerfl ar p uSleiir r-6leinGennL-rpparen et$srfluupein qg:ob(=ry) r6leinerA en p u9lein r6leinGalnu-r$penen6 lgenpuupein qg:ouLb

( @ ) $oddl ein dei;remqggg$$ meu er$rsrfl u upein q9reu6

(r,.) $euridleinrJlei;renq9$p$$teneorrigaopuupeiirqgreub :

In an X -rav tube the intensity of the emitted X -ray beam is increased by :

(a) increasing the filament curent(b) decreasing the filament current(") increasing the target potential(d) decreasing the target potential

g. gri ergtris1gorglgtei zehen gg qGrJnrrnglriglb, @O pgrg.ngBgLb' $)eorGu leiren $ arar rfleinerfl u el Lo$gLb el@ttis1g ogleoes6ir (!D6DpGu-.r :

(.gr) e,!lf r0 o6lar+ LoggLb oeu rie6l 6616D+

(gi.) er-6l LoromrLb sou rie$l oql6o+

(CI) uflr.O er9lar+ to$gLb o617r@ er9laoe

(r.r.) ser ri&61 or9lene ropgLb souiefl er9l6De

The nature of the electrostatic force and nuclear force between a proton and a neutroninside a nucleus are respectively :

(r) repulsive and attractive(b) zero and attractive(.) repulsive and repulsive(d) attractive and attractive

4678

a'Esoq{ss6i

l!5Fsi

latltr*sB

[ 51Ou '-.1*

/ Turn over

4678 4

10. @(D LD rg96n& u0 ei,repfl d; er$pGl eu n6 sawpp gl Lb Gl euel u $t$p Lr u @ ilr

,n aton r rilgost eo+ lopg ri rdl einGen nrrLb gB u ou $$l ein Lo$l u qsoir geopGu.r

e : 200 sin[a,t - ;),' : rosin(,rt - *) *a. geopfleu ;!16]'Q6m,r*rLb Lopglb

rf einarqg$p Lb gdlu: eu $ grridlar rGur zeiron e rL-$Cl prrnq :

(er) dleiremqggBri rfleinGeunrr-$arp e9r ] "t-. etonofleu rgleinprardl $Otittg'n

(g) r-6leinGemnL-rb rfleinenqg$p$eop orgr | ".. .96r6616D geinGain&61 $Cq'itgtb

($) dleinGeunL-rrn rdeinarqg$p$arp o6lr- ] ".r- sonofleu geirGenn66l 6Cq'i'(5'b

1r-r') rdreinarqg$pri rfleinGennrr$eop orgir ] *-. +reno6lau 9oinGarn66l 6gti<q'b

In an A.C. circuit, the instantaneous values of emf and culrent are respectively

( r\ -^ 1 rr,\e -200sinl rt- ; l. i: 10sinl ort* - |

I 3r', \ 6)The phase relation between current and voltage is :

(a) voltage lags behind current by a phase angle of I

(b) current leads voltage by a phase angle of I

(.) current leads voltage by a phase angle of I

(d) voltage leads current by a phase angle of ]

rfleinsn$g s{eneus6ir :

l .gr ) rsmr6s6Dos6ir eLrqd)

( g ) Glp;L-areuseir g19Lb

;' ;il:;;;;-i--*X" *"n,g, lsst,*,sener;sennaGern s1q&eeunLb -s*fr

1L.

pLb eteueu; 1gg&seoeusqgLb etebo -"8ves are :

-#E' l"'Se

udinal or transverse ,Suomat or lrallsvcr )e R;Ad .tudinal nor transverse .-'tP'o .:+8"i" ,.{Ss

4678

10. SD(D LD ng66ne r-6lein+f fleil er$pGlar n19 sarr$$ I rn G +u elu @ppu u @ til

16l einafl u d gergl are o$p Lb r-6l einGennrr-b gB u eu $fl ein o$ u qseir g:aopGur

e -- 2oosin(ot - a'l .; I -\\ 3 ).

= ro sin[r,rt + i J +O,i, $8ap$]<;U rtrleii'Galr--Lb ogrpLb

r-61einerrrrl6gb eldluL ar Eq ridleo rG u zeiron sr-r$Clpnriq :

(.s) dcinarqg$pri r6letrGennr-r-$enp orgir I *...soror9leu Gleinprudl $Otigtb

(g) L6leinGennL-i--rn r$einemqg$p$onp o$r f *.. elorafleu goeinGainddl 6Cf i'Cg'b

($ ) rfleinGarnL-rLb Lfleinarqg$p$arp orgL | *.. .sara9leu goeinGarniidl 6Cf ,ttfgtb

(r+) Lfleineuqg$pLb rtrletrGerinrL-$arp elglr-- i ".- etenaglo geinGenn&61 6CO,itgr.b

In an A.C. cilcuit, the instantaneous values of em{ and current are respectively

e - 2oosin(rot- 3) . i = to r-(.t+ I)' --"" \- 3)', ( 6/The phase relation between current and voltage is :

(u) voltage lags behind current by a phase angle of ]

(b) current leads voltage by a phase angle of f

(.) current leads voltage by a phase angle of ]

(d) voltage leads current by a phase angle of ]

11. r-61einen$p eleooseir :

(gl) (ggdseoooen ggLb(g) Glp._reoeusoir ggLb .a($r) GprraoeusonnsGorn el6D6Dgl qgglBeareusennsGern @griseonLb *ff( r.r.) Glprrareusqgri eteueu; ggrisara;eqgLb eleueu oFElectromagnetic waves are : -

"d'(a) transverse "rp(b) longitudinal .{at-i.i mai be longitudinal or transvers" ;Fial neither longitudinal nor transverse

,,.69-.4Ss

(er) @t19geneu $Cf"q 6p,.in (.ry) rfleinqeu er0eoe

($) 16leinqeud ( r.-r') r-6leineurLoris Lb

\Atrich of the following quantities is scalar ?

(u) dipole moment(c) electric field

13. eO egl [p516fl pneinlg goaareue ennem A, B, C o$96 D-u9leb gargrGu: q eirofl

r-Oeiirgnrrrile eir +q, +q, -q topprLb -q gdlu:enel eoaurisu u r@eir6n66r.

ereeglrl$$lein aC iopgLb BD qdlu greno o$rrulseh GlouL-r96 CloneirqgLb qehaf)

'o' ei916u Gpnlguueiir rfleinqeuri Cleflou narg :

(s) eB - rilg $arerour nar $1eoeu9lel Gl+ueuu@ib

(+)nc - ti1g $teoamu netr $lar+u9leu C1eueil@Lb

(6) CD - rig $aoatru nen $eo+r-r9leu Cl+u-Leuu$tLb

I r'r- ) sr-6lur nrsrb

Point charges +e +q, -qand -qare placed atthecomersA,B, C and D respectivelyof a square. O is the point of intersection of the diagonals AC and BD. The resultantelectric field intensity at the point O :

(a) acts in a direction paralle1 to AB

(b) acts in a direction parallel to BC

(.) acts in a direction parallel to CD

(d) is zero

L4. 6lui,Cq *1g eir s neuorrannr-6 rrrfler'l srir9leolgeoen$ Gipnrasafilr uneiuuri -Glorermseuri s6D6D6x$ s Lb Lql6o u,.r u uueinu$t$p6 snyatrLb:

(et) or$gb $pein etpod(g) rdeinpenr erain .s1$oLb

(6) gfr<q Gonam a$eosgtGoneo $)q9uq eglar+ et$lslb(*) e,fuu1g Gsnem or9leusg.trisnen $6uq or9lerre lgenpa4Phosphor-Bronze lt ire is used for suspension in a moving coil galvanometer because ithas:(u) High conductivity(b) High resistivity(.) Large couple per unit twist(d) Sma11 couple per unit twist

5

12. 8$saimr er oneq s qgeir a-gl eiuGseuni cl onar nlgLb ?

4578

(b) electric force(d) eleckic potential

.g0q

aLrs6rfrFw

.$&

\Bt#

E

[ 6guq* / Turn over

4578

15. srrLr uenrGuppp$oil ,

(er) seri$l geoeuu5lein sr-L-Lb Lor@GLo Lon-g Lb

(.+) ,sun6l etareuu9lein et$lriGlouaim Lor@GLo LongLb

(6) :f'6 sareuu9lein sL-L-r,b Lo$gLb et$lriGlorrain LongLb

(m) osrfrp elarellu9leir et$ riGlor ain LopgLb sL-L-Lb Lonp n5t

In phase modulation :

(u) oniy the phase of the carrier wave varies

(b) onJy the frequency of the carrier wave varies

(.) both the phase and the fi'equency of the carrier wave vari.es

(d) there ls no change in the frequency and phase of the carrier r'r'ave

'76. 0.5 m2 u6uuoreootqLb 10 apge atanul rj: Gle nolrr 919 aLbGleagafleir parib

o.zwb/r? snppuqeu$$p1gri; 1g$pna zeirorr Gung sL-br-91+s1gofleir ar5!Gu unqirSIIIE6UUTlrlLO:

(er) 1oo wb (g)to urb (g) 1 wb (") "SA coil of area of cross section 0.5 m2 with 10 turns is in a plane which is perpendicularto a uniform magnetic field of 0.2\Nb/r?. The flux through the coil is :

(u) 100 wb (b) 10 wb (") 1 1\'b (d) zero

17. 4000 A .etareu$6ngo6it6n SO gofl u nemS 2 pm Glpneoeueq sr-pp r91p g z19or n86Lb

srr Gelmtunfi :

(er) aS (q,) 3" ,^. T(9, tA light of wavelength 4000 A after travelling a distance of 2 pm produces a phase

change of:

(a) zero (b) 3t

18. Ggiri$ara rfleinGennL-L*$aop poin euglGu unu e1g1Lr$)Bsnp e1gofi er5?

(et) rfleinporr (q) dlehGP&61

(@) r,6lc,iir grainq (r=r.) GLo$sainr erenen$5rn

lA4rich of the following devices does not allow d.c. to pass tirrough ?

(a) resistor &) caPacitor

(.) inductor (d) a1l the above

'ii(d) ;1i(") ,

79. reirafs seir g6nr0 €ijT $) [u 19 ui no Lo$ Gl p neing el eo Lo q LbGu ngl Lo r@Gro 6l ororug@

ererr .slartoq Lb aunS[i Gsr :

(cl)aNn (qs)NAND (O) NoR (r=r,) EX()R

only when the inputs are complement to eachA logic gate which has an output'1'other is :

(u) AND (b) NAND (.) NoR (d) ExoR

20. p-el oGeunrflLonerfl G+npenamull6l 1A (i grnEuri) r6]einGorirl_l_Lb g1gsbr91&ageir oug!uns 't' sneu$$lf gu unqriGungt $rflein Geuuupeoer; 30"C-u9dClr5 33'C +6 e-u66lpg. etGp sLbL-!}d *1geir orgluira z A (2 gLbdluft)rileinGemruLb etGp sneu$$S1qu urqLbGungl erGp erorq $rflein Glaruu$aroso"C -u9leflg$g erpp Glor u r$)meu61g ru.r19Lb?

(er) 33"c (q)ea"c (gr) 3e"c (n) a2"cln Joule's Calorimeter expedment, when a current of 1 ampere is passed through a coilfor a known interval o{ time't', the temperature of lt ater- increases from 30.C to 33.C.\Atren a current of 2 A is passed through the same coil placed in the same quantity ofwater and for the same time, the temperature of water increases from 30"C to :

(u) 33"C (b) 36"c (") 3e'C (d) 42'c

21. rdieingrL-L-Lb Clufgeir6n zeirafrfp zGonsuu$gt geirp, sd r6leinqeu$eoperir ueiraflsofleu Gs nrir rnrer!'Lidlm s r r(er ) Genar$$$g Glelafl Gu"r

(@ ) Gsren$$eiir ui-qpLb

(a) outside the sphere

(.) inside the sphere

A hollow metal ball carrying an electric charge produces no elechic fieid at points :

(+) etpein u rJu r9lein GLoeir

(n.) @gLrr*ra1g Glpnaoeuoqdlg 4r1u I ner.>

(b) on its surface

(d) at a distance more than twice

22. gg peffiLo$$eir Gou$ LopgLb r-6leiiruainqaqg&g{i srl6nrlon6n er$g6rflLD$6]6iaetglo$g:oiron areu6r-rlneiirseir :

(+l1) Saremr$peir ereurirpneinaeir (el) epg,b erer;rirrlneinsoir

( 6t ) srSlslr u +ur reu ereu&rpreiirseir ( r-r') Gau el$pein erer.lrirqneinoeir

The electrons in the atom of an element which determine its chemical and electricalploperfies are :

(u) valence electrons

(.) excess electrons

4678

Ir

ost

soI

IEE&!JFFB

(b) rer,.olvingelectlons

(d) active electrons

[ $lgLrqs / Turn over

4578

23. Gpneoeu pser! u9lenrneb etgluuGouainqu et&+q$p gelerm$eop l6leineneoa;seirns

LOfTrDmtLD 1LO6I.)m :

(er ) er$Clrlnofluq

(6t) uainGurirmLb

Printed documents to be transmitted by fax are converted into electrical signais by theprocess of :

(r) reflection

(") modulation

24. zureuri e'g56rfl6ir g:aremarnrilgLb $pelAein e16D(g :

(er) c2N.t6 (g)Nm2C-1 (g) N h-2C2 (") C-1m2v

The unit of molecular polarisability is :

(u) C2N-1m (b) Nm2C-1 (") N-1m-2C2 (d) C-1m2v

25. rGeunsuu uu q @6ijTdl6i,r pg$gr rf1etrar1g$pLb opareor& enri$$1 qrgJ?

( el ) uOLb s$lrier5e8ein er$lriGleuaio'r

(+) "O,b

e$rioS+flein Cl+flq

($l) e-Gonsu u r7u r9leirr peinarLo

( r,r ) Gl ar orfl Lr u @ Lb a-eu6 rrJneinsafl ebr $1 ao+Geusb

The stopping potential of a metal surface is independent of :

(u) frequency of incident radiation

(b) intensity of incident radiation

(") the nature of the metal surface

(d) velocity of the eleckons emitted

26. eopoL-7gein etg) o916l r9leinoulgung ereuiirrlneine eir pnoqLbGlunqgS er$1ci Clu19Lo

er$riGleuain Glsr6rdu s$rioffria GpneingLb?

(er)z-+7 (.4)6-->2 (6) a-3 (r'r') 5-+2

In Hydrogen atom, which of the following transitions Produces a spectral line ofmaximum frequency ?

(u) 2-:1 (b) 6--+7 (c) 4-+3 (d) 5->2

(g) er rflri; sanrGerurnL-r--Lb

( n') eaofl ronrnru r(il

(b) scanning

(d) light variation

27. 96 r6leiror$$lm utn 6O grenerrsqgrideorGu reiren r6leiiemqg$p Gergunr--enr

X-et a$l gl 6, u r$$l u5l eu Gl eef gl rn 16l eiirGarirrr$arp Y-et &Sl gl,n <g.dl pglou eoTu rLb orar r1u.l u u @61pg. GpririGsnr@ ar en yr r$$l ein +iflq erarprirarfl6rsLb?

(er) L6leinpen r(6) pa dlein parr erain

(+) ,ilnin sL-gg $peiir/n ) rdleir srBsr crer-n

A graph is drawn taking potential difference across the ends of a conductor alongX-axis and cuffent through the conductor along the Y-axis. The slope of the straightline gives :

(u) resistance(c) resistivity

4678

(b) conductance(d) conductivity IE

&{,

fl

6B

e{r}

Fffi

EJS|

t:r;}F

IBt,9

28. B - 6larpa9lein Gungr :

(s) etgt erain geiirg 196npu-ltb

(+) 6l-p erain geing g6opulri)

(S ) -Gni -rein erainarflBaos tongJ-rgl(=) $lgrrinein eraine&fltiens geing garpqrnln B decay :

(r) atomic number decreases by one

Cr) mass numbel decreases by one

(") proton number remains the same

(d) neutron number decreases by one

29. e1@)69l6in gop6n go6i'Tgr Gurir orrru u neopaerflein *A1rilsaflein o66lpLb :

11(.+r) 1: r:

' (g)r:2:3 ($) r:+:9 (fi) 1:8:27

The ratio of the radii of the first three Bohr Orbit is :

11(a) ,, ,, , (b) 1, '.2:3 (.) -1 :4 :9 (d) 1 : 8 :27

30. B(D elDp6n e9 ofl riqoflaronq ri ESparflrL9ou oueoiJuuu@eiro, 6>(D Gsnrrqein

sseuLb 12000 A Lo$grn gg r9lora61ein etseuLb 8000 A eredlel, EDp*fl U6DpS6irLo$)Lr u namgt :

(.gt) 20 pm (+) 2 rr." ($t) 200 pm ( r'r') 10 plm

In a plane transmission grating the width of a ruling is 12000 A and the width of a slitis 8000 A. the grating element is :

(u) 20 pm (b) 2 prn (c) 200 pm (d) 10 pm

[ 619rq* / Turn over

4678

u(gSl-II/PART-rr

(gdlull, oanerGu:gtLb u$eoeu, $gr e$arn&sq961g o$en ruofl .

Note : Answer any fifteen questions.

31. $leno rfleinerflu-r er5leu s'GeunLb a.9l$leouri a'gs.State Coulomb's law in eleckostatics.

32. HCI ornq 2.5 x 104 NC-1 elene4eiron l6lei;rqeu$$ci-r arourisuu@61einpgl. gelGlo:ngHCI q9ceoda.fl6ia dl6in 6t(D19o-* 6<OuqpSlputn 3.4x10-30 cm ererflar g19qgoeutia.flein rfg Gleuelu@Lb GlugLo $guq oflar+ou-r sarr66l@s.A sample of HCI gas is placed in an electric field of 2.5 x 104 NC-1. The dipole momentof each HC1 molecule is 3.4x10-30 cm. Find the maximum torque that can act on a

molecule.

33. gein dlein penr eraiur - 6l6li)f urg, etp6itr g6u6D5 pgis.Define resistivity of a material. Give its unit.

34. l6lein $urigofleoe LoSgLb rfleinatqg$p Gerglunreor gul9@e.Compare emI and potential difference.

35. ds sL-$$lsaflein u ueinsoflo ereoeuGugtLb geinflenen 6r(9gls.Write any three applications of superconductors.

36. .'.L5lonL6lru $rgeos or9l$laru6 a'gs.State Fleming's left hand ru1e.

97. 96 Long$1eo+ rflelrGennrr rdeirafiu$$1 10,000 +frgdseoeirqLb 100 cm2

uguuoneoeuqLb Glsnaim@oir6ngl. 3.6 x 10-2 T s1eno4 eiron STnor sn$pqo$$1eir6rilrqle &/rh6n n6rrs.r I40 rom 6r6tTm Gsrr60n 6]6oeG6trsri6lei oLoel-rdlrnsr. snaimluuGlLb

rfl eiirafl u ei 19o6l ar+u91 eiii Gl u lg Lo Lo$ u en u ri o nains.

An A.C. generator consists of a coil of 10,000 turns and of area 100 cm2. The coilrotates at an angular speed of 140 rpm in a uniform magnetic field of 3.6 x 10-2 T.Find the maximum value of the emf induced.

10

15x3=45

38. S[6 5r[6r6fl - 6u6orJurg].

Define quality factor.

77 4578

39. g6rflLqtu eppd) +ni$geirer anTemfloeir u_.1'T 6ir6il ?

On u-hat factors does the amount of optical rotation depend ?

40. 3 m grJgoeiron g(E pLL lger9lcleueiironeng p L6D Lr-Lr r6fi sannemrnq parEeiir r-6gt

eoorrisirur@, @p6op 6lp gaflu9alnel gorflgluu@6lpgr S -dgt 5(D6I)LD

oueooru$$ein qTLb 3.6 mm ereinp nei, gofl ugleiir eteoo$orri: ereinen?A plano-convex lens of radius 3 m is placed on an optically flat glass plate and isilluminated by monochromatic light. The radius of the gth darkiing is 3.6 mm. Calculatethe wavelength of light used.

41.. etgl er9letn 41u-.: erfl u: nris rfleinelrqg$gLb ereingrnel ereinelr?

\44rat is ionization potential of an atom ?

42. eag,D-q26il .9r g:] 6$l6itr rflrGluriai Lo nfle8l 1.0ozx t07 m-1. eneu roeiir o! rfleoe ugl6in

6rrgLo g1eneu$en ereleoeuen urei semrridl@s.The Rr-.lberg constant for hydrogen atom is 1.097x 107 m-1. Calculate the longrr avelength limit of Lyman series.

.{3. uuein Clpnrrio er$ n6atai.n - el160[utg.Define threshold frequency.

44. dlurrfl - araorurmr. wrf,ril[r, kalvEso[ a E "ce rtlDeflne Curie.

45, s$nefiri* gu-rousrroofleu u arfl u nf g u ou riseir GLof 6sneiren Gauenrrqu-rgoeiirGl emesrfl tiats p reu E6elrsseir ut naoou ?

what are the precautions to be taken by the people who ar.e working in radiationlaboratories ?

46. lgeoprisr$$ geiirarp Longr@orpfonen Glou erGeug ouglgleopseir u-L nenar ?Write the different methods of doping a semiconductor.

47. rq- ro nriseiir Gp$prusao6nr; 6-0to.State De-Morgan's theorems.

48. eorGun@seir uueinll@$pLtLtrr AND Gsr@risnem r61ein+Sg u ur6 oueoTo.Draw the circuit cliagram of AND gate using diodes.

[ $guqs / Turn over

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49. gg $eurflu Gleu-.roun$t Glug66u91ein urLb 6Gp Glan@risuuL-Oeiretgt

*gOG 6en@6suu@Lb reiraf@ 6os6os vin: -2'5 V d'c' eraflou GlorafluS$t

s ned,ng.

Find the output of the ideal operational amplifier shown in the figure for input of

Vi.': -25 V d'c'

50. oslau uanGu$gl$$leil "uaimGupp 6rafu-r" - err6o[ur9'

Define modulation factol in amplitude modulation'

ug$l -lulPART-III

gfluq : (i) o,glenn erenr 53 - &19 ssdmqiune er9lar uu afl riaeq Lb'

(ii) L-6p gr eiron 11 orgleornrisafl eu ercoeu Gu: g.ltb glgr e9euir6sq96i9

or9leo r--u afl riso4 Lb.

(ii, Gpenorruu@Lb $lL-rare ofl eu u L-riseir ouarTs'

Note : (, Answer Question No' 53 compulsorily'

(ii) Answer any six of the remaining 11 questions'

(iii) Draw diagrams wherever necessary'

51. u6leino,glate6 Gon$teofl eiii uellrqsaron& *''9s'

Write the properties o{ electric lines of force'

52. osroiureiir eLoerr} a$f1ef eo$leoeurianen $lu$peoararuu Glugs'

Obtain the condition for bridge balance in \Aiheatstone's bridge'

7 x5=35

39 ko

39 ko

13 4578

53. urie $eoaorurseu s eirar 3 o,5 o, Lopgrn 2 o rfleinpen L-u n66lsoir r5 v rdleinarqg$pGorgunr@r-ein $laromriau u l@eirenen. ger Gla., neinfrein org!Gu cr*a,,-g,i,r6leinGennr-r$aop6 samri6l@s. GLogLb Gpnlguurein L6leirrparL_eou.l rq Ll, clLonppr-6leinGomnrL-$arpq Lb samiidi @s.Find the current flowing across three resistors 3 o, 5 o and 2 o comected in parallel toa 15 V supply. Also find the effective resistance and totar current drawn {rom thesupply.

gteueusr/OR

$lg rjleirrpar r--u niidlseir GlpnL-rflaramurglgLb, u6s Stararru Glg Lb zeirorGu nglGlprlguuein r-6leinparL-seir goeopGu 10 o Lo$gLb z.a o erafleb, pafr3ipafl*,nJmr6leinp ar rseir unenat?The effective resistances are 10 O, 2.4 O when two resistors are connected in series andparallel respectively. 144rat are the resistances of individual resistors ?

54. 20 Q dl;inpaor Glonomr s nei:euennr,8rli geing 50 mA rfleinGemnr-r$$1$1ggLogro9eueoeu6 Glsn@6gLb. 6tp-* (i) 20 A €16n6(gLb 4q6rfrr7ns, (ii)120 Ve;r'EgLb Gor neb r_ rfuTns erou ar ng Lon$parnLb?

A,moYing coil galvanometer of resistance 20 o produces fulr scale deflection for a currentof 50 mA. How will you convert the galvanometer into :

(i) An ammeter of range 20 A and(ii) A voltmeter of range 120 V.

55' dleinLonglflu9lri.r qEu0Lb $grein @rpr-rqsaron o,glenrigo. eru,iDmp ereleung6elr p+ioer.: n Lb ?

[xplain the energy losses in a transformer. How are they minimised ?

55. .'.uq9on-rrri o51$1aru6 s,dl, $lUoqsState and prove Brewster's law.

57. X -s$ neafl ein I ainqsafleL ereoouGugtLb g$g Lor@Lb 6r(ggJ6.Write any five properties of X -rays.

58. Gleu nrlainroiu- rglroiuGrg rnerGr (Lorentz-Fitzgerard) gg6s$$arem grio@$gi6snr@ rein ergl enri gs.Explain Lorentz-Fitzgerald contraction with an example.

[ $gL,qo / Turn over

4678

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t4

u(DU GlLr r(D6ir gt6o6uo6rfl 6irT r1r9 7no5i eleoeu$on$$$orem Gs n eoel eo u--trl Clrgs.Derive an expression for de-Broglie wavelength of matter waves.

60. ,,C12 LopgLb uC13 etgl&s15risaflein 6119 el@lr; a6$ 5aq96snen Gleneooruq

gf pdoseir grenpGu 7.68 MeV .opglti: 7.a7 N{eV er en +1eo L-o dleinpren

^C Il etemr risrro,glesltn rq arq $ qlrlreoem Gl ar"rflGu $p$ Gp arer u rcir

6- .-'a:?' \,

€PPaoerrr; sem;6d@aThe binding energy Per nucleon for 6Cl2 nucleus is 7.68 MeV and th^at for oCI3'is7.47 MeY . Calculate the energy required to remove a neutron {rom uCir nucleus.

6t. rq Tn6in$l6iD L-r ereleu rg g1g +na,9luns (switch) G)aueuu@61pg oeirrpeoen o9lo rrfl.

Explain the function of a transistor as a switch.

62. seuridlurglrflaigLb FM q$ r5l G1+ueuu@paoeuri srruur$Slrein o,9orri6s.

With the help of a block diagram, explain the operation of FM superheterodvne receiver.

ug$l -lvlPARr-IV

6fluq : (i) 6'T6D6rGugl6 gn5irg oI9l6nn{i5@6(9 a9rfleunen o8eoruafl. 4x10=40

(i4 Gpeoeru.lnar $trrasofleu ui-rt.loeir eleo;rs.

Note : (, Answer any four questions in detail.

(ii) Draw diagrams wherever necessary.

6g. r-0 ein $ 6 gr ar enur r6D gO q eirofl u9 eu op r'l $t Lb L6l eineuqg$p$$ p 5 r6n Gs rr6o6u 6rl ur u

Gugs. flgruq GpnqsarorqLb o61eurfl.

Derive an expression for electric potential at a point due to an electric clipole. Discuss

the special cases.

64. rdleinGelrnrrLb unu-.lLb 666nL, GprInelr, r'r=flon s5r$$u51enneu gg qeiroflu9lei;

6rDLrOb s n$p$gLlaiotes ein LopuL-9$srem Gonooereour Lr C)ugo.

Obtain an expression for the magnetic induction at a point due to an infinitely long

straight conductor carrying current.

65. sn$pqeu$pein $1eo+eouu Glrng$5 919 s Lb r9l++gafl eiir $1en+ueoLoLreouLon$gteupein qgoeurn et$el rdeineofl uBger9lar+aru Slatr@ ri Gr6i)p6lrr1r o6$$ueue9ar6srfusqgreiir o9er rfl .

, Discuss with theory the method of inducing emJ in a coil by changing its olientationwith respect to the dlrection of the magnetic field

15

66. Clorafl or9l@ $]p.oneoeu opELb zr_seuri $)pLoneoeu ereiirp nel areinar? eto:$fleinclor:eirGoug 6rr6n5s6D6rr er@$5,6snL-@reiir or9ru,r61gs. (u.-Lb Gpan uSrebeoo ).what is emission and absorption spectra ? Explain the different types of emission andabsorption spectra with examples ? (Diagram not necessary).

qgrQ Ga.rerflein Glpoflor nar u16euarqu L-$g L-ein er9larrigs.

Draw a neat sketch of Ruby Laser.diagram.

4678

67.

68.

or16D[6. etpein Clauebunrenr gflpeb orL_

Explain its working with the help of energy level

59. r9leingrurLb ereinp nei ereineu? er$1ri rgeingrrr-Lb Gle n@6euu* Gru g66lug eirrfleiirorqg$pu Gl u g6e$$pa nen Ge neoeueo u: u G) ug s.lvhat is meant by feedback ? Derive an expression for voltage gain of an amplifierwith negative feedback.

GyL-nri 4ryenuou r-9lein srL_u u r_Lb ouenT$g .erpeirC1+uretu rurqenar efieu rfl.

Explain transmission and reception of RADAR with a

-o0o-

70-

sr6iu6l6 s$lriseir creirp neb creinem? snoiur-6lior9leoorq (ii) qgpgtuf erglaoonq gdu:ouSeop\A/hat are cosmic rays ? Explain :

(, Latitude effect

(ii) Altitude effect of cosmic rays

s$lrieoflein, (t) lggrigd; Gsnr@a51orrui1gs.

![uq6n5 Lo$g Lb elpqBsnen

block diagram.

I