No. of Printed Pages : 15 GprrLb:3Loarfl) Time Allou'ed : 3 Hours ] +2_ M --i5- 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)Checkthequestionpaperforfairnessofprlntinglfthereisanylackof faimess, 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$$ u9lein peinrSlein Stonro orain : (er)"S The self inductance (u) zeto (+)Clqugldl of a straight conductor is (b) infinitY (6) + *o mass 'mo' attains the (.) 4 *o rflo er$ob very large (m) grlofleS) velocity of 1ight, its mass (d) in{initY 30x1=30 (r+) rflse4Lb Efltgt (d) very small z. eueq 6larp 'mo' Glsnaiuu 919 ulgLrGungeir gofl u9lein $lauGeus$$1cn G+einpner;' etpetr ParPureng : I -er) er6l When a material becomes : (u) o (+)2-o particle of rest (b) 2 -o w1,ttM M EvE so B a$' eo s-tl [ 619"q* / Turn over
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No. of Printed Pages : 15
GprrLb:3Loarfl)
Time Allou'ed : 3 Hours ]
+2_M --i5-
4678
(gdlur..l , (r)
Note :
(i')(i)(i,)
(6):
(c)
u$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'
(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
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 ?
(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 :
(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$$eiir ui-qpLb
(a) outside the sphere
(.) inside the sphere
A hollow metal ball carrying an electric charge produces no elechic fieid at points :
X-et a$l gl 6, u r$$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$$l ein +iflq erarprirarfl6rsLb?
(er) L6leinpen r(6) pa dlein parr erain
(+) ,ilnin sL-gg $peiir/n ) rdleir srBsr crer-n
A graph is drawn taking potential difference across the ends of a conductor alongX-axis and cuffent through the conductor along the Y-axis. The slope of the straightline gives :
(u) resistance(c) resistivity
4678
(b) conductance(d) conductivity IE
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28. B - 6larpa9lein Gungr :
(s) etgt erain geiirg 196npu-ltb
(+) 6l-p erain geing g6opulri)
(S ) -Gni -rein erainarflBaos tongJ-rgl(=) $lgrrinein eraine&fltiens geing garpqrnln B decay :
31. $leno rfleinerflu-r er5leu s'GeunLb a.9l$leouri a'gs.State Coulomb's law in eleckostatics.
32. HCI ornq 2.5 x 104 NC-1 elene4eiron l6lei;rqeu$$ci-r arourisuu@61einpgl. gelGlo:ngHCI q9ceoda.fl6ia dl6in 6t(D19o-* 6<OuqpSlputn 3.4x10-30 cm ererflar g19qgoeutia.flein rfg Gleuelu@Lb GlugLo $guq oflar+ou-r [email protected] sample of HCI gas is placed in an electric field of 2.5 x 104 NC-1. The dipole momentof each HC1 molecule is 3.4x10-30 cm. Find the maximum torque that can act on a
molecule.
33. gein dlein penr eraiur - 6l6li)f urg, etp6itr g6u6D5 pgis.Define resistivity of a material. Give its unit.
uguuoneoeuqLb Glsnaim@oir6ngl. 3.6 x 10-2 T s1eno4 eiron STnor sn$pqo$$1eir6rilrqle &/rh6n n6rrs.r I40 rom 6r6tTm Gsrr60n 6]6oeG6trsri6lei oLoel-rdlrnsr. snaimluuGlLb
rfl eiirafl u ei 19o6l ar+u91 eiii Gl u lg Lo Lo$ u en u ri o nains.
An A.C. generator consists of a coil of 10,000 turns and of area 100 cm2. The coilrotates at an angular speed of 140 rpm in a uniform magnetic field of 3.6 x 10-2 T.Find the maximum value of the emf induced.
On u-hat factors does the amount of optical rotation depend ?
40. 3 m grJgoeiron g(E pLL lger9lcleueiironeng p L6D Lr-Lr r6fi sannemrnq parEeiir r-6gt
eoorrisirur@, @p6op 6lp gaflu9alnel gorflgluu@6lpgr S -dgt 5(D6I)LD
oueooru$$ein qTLb 3.6 mm ereinp nei, gofl ugleiir eteoo$orri: ereinen?A plano-convex lens of radius 3 m is placed on an optically flat glass plate and isilluminated by monochromatic light. The radius of the gth darkiing is 3.6 mm. Calculatethe wavelength of light used.
6rrgLo g1eneu$en ereleoeuen urei [email protected] Rr-.lberg constant for hydrogen atom is 1.097x 107 m-1. Calculate the longrr avelength limit of Lyman series.
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$$1$1ggLogro9eueoeu6 Glsn@6gLb. 6tp-* (i) 20 A €16n6(gLb 4q6rfrr7ns, (ii)120 Ve;r'EgLb Gor neb r_ rfuTns erou ar ng Lon$parnLb?
A,moYing coil galvanometer of resistance 20 o produces fulr scale deflection for a currentof 50 mA. How will you convert the galvanometer into :
(i) An ammeter of range 20 A and(ii) A voltmeter of range 120 V.
[xplain the energy losses in a transformer. How are they minimised ?
55. .'.uq9on-rrri o51$1aru6 s,dl, $lUoqsState and prove Brewster's law.
57. X -s$ neafl ein I ainqsafleL ereoouGugtLb g$g Lor@Lb 6r(ggJ6.Write any five properties of X -rays.
58. Gleu nrlainroiu- rglroiuGrg rnerGr (Lorentz-Fitzgerard) gg6s$$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$$$orem Gs n eoel eo u--trl Clrgs.Derive an expression for de-Broglie wavelength of matter waves.
gf pdoseir grenpGu 7.68 MeV .opglti: 7.a7 N{eV er en +1eo L-o dleinpren
^C Il etemr risrro,glesltn rq arq $ qlrlreoem Gl ar"rflGu $p$ Gp arer u rcir
6- .-'a:?' \,
€PPaoerrr; sem;6d@aThe binding energy Per nucleon for 6Cl2 nucleus is 7.68 MeV and th^at for oCI3'is7.47 MeY . Calculate the energy required to remove a neutron {rom uCir nucleus.
, Discuss with theory the method of inducing emJ in a coil by changing its olientationwith respect to the dlrection of the magnetic field
15
66. Clorafl or9l@ $]p.oneoeu opELb zr_seuri $)pLoneoeu ereiirp nel areinar? eto:$fleinclor:eirGoug 6rr6n5s6D6rr er@$5,6snL-@reiir or9ru,r61gs. (u.-Lb Gpan uSrebeoo ).what is emission and absorption spectra ? Explain the different types of emission andabsorption spectra with examples ? (Diagram not necessary).
59. r9leingrurLb ereinp nei ereineu? er$1ri rgeingrrr-Lb Gle n@6euu* Gru g66lug eirrfleiirorqg$pu Gl u g6e$$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.