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CBSE Class XII 2011 : APPLIED PHYSICS (Theory)

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- ': 105 - a>l5~. Code ~o. I ~ v~ ~ 50S I ~II~~ I I Series I I I I I I Candidates "\'R;r. I I I I I I I the title pageof the answer-book. ~ - ~ c J5 - ~"q)1 wr;ite the Code on ~ q )) C ~ . must fSTg I -;:r & I Trlft Roll No. I ~~~I . . written on the title page of the answer-book b e s hould p aper q uestion t he o f s ide h and r ight t he o n g iven n umber C ode . Please check that this question paper contains 4 printed pages. by the candidate. . Please check that this question paper contains 4 questions. . Please write down the Serial Number of the question before attempting it. 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer I ~ ~ 1 ~ j"@-~ I ~ ~ 4 ~ ~-~~""qjT ~ ~ ~ I ~ f (;rf " ~ -~ ~ (fiT ~ ~ -~ ~ I ~ " (fq)" ~ ' q)T ~ ~ 1 0.30 ~ m I ~ I ~ ~ ~ " ~ (fiT ~ ~ ~ ~ ~ q j):s- # ~ ~ f iRc: 1 5 1 0.15 I ~ ~ # ~ ~ ~ 3 -~ this period. -~ ffi ~ ' f ~ ~ t;Rg';JT ~ q;1 f Cfi f Cfi ~ ~ ~ # ~ # q j'\ ~ ' ~ q)T q j'\ ~ ~ ~ I ~~-C)O~-~~~~~~ 1 0.15 -~ m ~ # ~ ~ ~ -~ ~ ~~ # ~ ~ . . . . . on the answer script during 4 . APPLIED PHYSICS (Theory) ~ 6 0 6 0 . . ~. P .T.D. 3 iq:; M arks.. 3 1 ~ M aximum h ours 3 f lUi7: 3 . . a llowed.. ~ 105 ~ Time (~~I~Q' ~~ ~1~~I~Ct> - _0-. "'.::.:; _:'c_~ (a) State Gauss~ theorem electrostatIcs. pp~y 'to A I't }}eJd strength at a point near a long charged stra?ght conductor. . OR - m 1. distance Define 25 c:zn fro:zn the terms: a ~ '\. ~ h _-voi=g S hC3C3t t hi~ f Rt.~~~~~ L~lQ p 'l_~C3 e leetrie ~ ~C3z- t he C alculate d istz-ib'-ZtC3d i s m 2. p 3 C} the (b) of 00 1 500 o f ~ E a rea c :),._z-g~ . Ac surface ~ --=- sheet. 'magnetic field strength', 'magnetic flux ar~ ~ ~~ ~~ ~ ~ t m 't) ~ ~ ~ ~ QI~dl 4 ~ ~ ~-~ ~ 5 he d oes H ow s ~ ~ ~ I conductivity? ~ their ~ " q)T affect W ~ -~~ (ar) ~ rise in temperature emi-conductors? e xtrinsic a nd i ntrinsic a re W hat (c) density' and 'permeability' of magnetic materials. Write their S.l. units. I ~ ctJ~~I-i " "('f'ifT I - q"{ ~ I ' ~ ~ ~ " a ~ ? ~ ~ ~ r~ j:fR ' q'{iffi " q)T ~ ~d<:.1 t S .L ~ ~~ dIY~I-i ~ ? ~ - q:<:n ~ "'fJ;~ ~ ~ ~ ~ -~ I ~ ~ ~ ~ a r~~ ~ ~ ', ~ ~ ~ m ~ c t "'fJ;~-~ m 3 00 2 5 ~ -q1<:.1ctJdl ~ 3=I"t:f~ ~ mathematical 5 t he t he f rom m 0 .5 C alculate o f T . 1 0-6 d istance x a 5 i s a t f ield c onductor m agnetic t he o f s one fissile material used in a nuclear reactor. N ame f usion'. ' nuclear a nd f ission' ' nuclear b etween D in the wire. istinguish (b) current traight c ~rrying m agnitude current The OR a D erive ( expression for magnetic field strength at the centre of a circular coil carrying electric current. a) 2. ~ " "('f'ifT a rt:f~ W ~ ~ " ill ~ m , " 'fJ;~ 3 i-;:r:r-~: (~) tTj~ctJ~n<:.1dl' (~) ~ 1500 ~C "q)T ~ 2 3T~ Why can't nuclear . fusion energy be produced easily? c;ff 6 ", : reverse biasings a nd f orward u nder b ehave i t d ? Explain. 4 - -"~t~:,,_: - - - - -~..::.; _:_~ 2 - 105 -- oes H ow j unction? P -N a i s W hat (c) ;:~, _ I ~rq~ , .,: C! 4 a o f ' 6 . . 5 ? ! IF w ith i n ~ ~ I f Cfim I ,-.: T 1 0-6 x 5 ' qft1:JTUT "q)1 ~ .if I ~ -~ ~ ~ I ~ ) P .T.D. ~ 8 s eries ~ 3 :r;(R ~ - t , of c onnected ~ aken b e c an ' "d2:(T 1 ~~U.srj' '~ fCfim ~ ~ ~-~ ~ - q-{ ~ m ~ 0 .5 ~ ~ m ~ ~ ~ 3t~ ~ ll.frjl ~ ~ I ~ quR ~ " ~ I w orking ~ ~ q)1 ~ ( a re ~ ~ " q)1 ~ , ~ "qfturrJft) i n ! IF 8 L I~"t:.!I<:;:~lctI ~ ~ 3 :j~I<:;:I~lctI 1~~U.srjl~ if u c apacitance - q:<:rT ~~31rffr;fr~~~~~~mm? ~ ~~..:i1,~~ ~ ses. f our a nd P-N -q-{~~-~ c I t he m eaS\;1res c onnected b e I ~ t X11~1 ? ~ ~ % m tX1~QI~ ft~ c ~ a ny ! IF 4 c apacitances o f c apacitors T wo ~ - e xplain s afety c alculations. c apacitance o f v alue W hat parallel. if tll<fJ,lUII<.11 ~ ~ ~ l-flrjl-'l:1~~o& t heir r esultant a h ave t o a rrangement this ~an ~ ~ ~ ~ W hat ? W rite p roper w ith a nswer y our Justify ~ q:<:rT ~ ~ (31)4!lF'"d2:(T ~ G~ 8 !IF ~ T ~ ~ ~ d iagram, OR ? ' radio-isotopes' a re W hat ~' ~ ~ N ~ P ' radiation-hazards' a re What ~ -P-N ~ )~ t hese? against '";jTf~~ ? ~ c ircuit a o f h elp t he W ith ? ~ ~ ~ t ransistor. N-P-N ~ ? ~ ~~~~~~~ ~ " q)1 ~ ~ ~ f - q:<:rT 8!lFm~? ( a) fu'& Cfim - q:<:rT ~' ~ ~ ~ ~ ~ ' ~~I-f~IRctI' (b) ~ QI~dl '1~lctI~Un (c) ~ ~ 3 1it1:!1 - qftq?;r ~ (~) ~ ~ ~ - 3 ~I (~) ~. 'lfTJldl~ :s-ffl ~ ~ - - ._~, ~ ~ ,- ~-~~ c - II. . -'--"' ~ .~ ~ ~ ~ ~ lTl-irI ~ ~ ~~? ~ 1:lli--~~ (a) 4. Define electric potential at a point due to a point. charge. Give its S.I. unit. Derive a mathematical expression for it due to a point c arrying c urrent a b y e xperienced f orce t he d oes f actors w 5 hat O n (b) charge. P-type and N-type t hese c an H ow a toms. ' Si' a nd ' Ge' o f s tructures a made 6 semi-conductors? 4 OR be tomic t he D raw (c) conductor placed inside a magnetic field depend? Write the relation between the force experienced and the factors. State the rule for determining the direction of this force. With help of a semi-conductor circuit 'full-wave diagram, explain the working of rectifier'. ~ I M ~ N -~ ~ P -~ ~ I ~ ~ ~ ? ~ ~ ' ' 1iUf-~ 3 1~~ ~ ~ ~ (il~dl ~ f T:r;r I ~ ~ ~ q uf;r " q:jf o oilj-jilChd c onstants F m-1 1 0-12 . C C -2 N m2 1 09 X 9 = 3 00 4 105 ~ 18:ii~ 0 4n ~ o C 1 0-19 = x electron 1 an .6 H m-1 1 on (~~~~) Charge 0-7 X X q , 1 1 i 8 .854 = 4 J.lo = n 0 q t ;, ll:fIffrq; Physical "q:j~ ~ ~ ~ Y (j-jlffJC!Ch ~ " \jfT ~ ~ ~ 3# ~ ' Si' 3 1~ ~ I I ~ ~~~~~~~"q)T~'i;T~ "q)""{ffi~? ' "q)T Ge' ~~~~m.q:~~~~"q)T~~ ~~~ ~I .q: ~-m"{r ~ ~~ ~ m-m ~~ & ~ ~ "fj~-~ (~) ~ .lffJldl~~~~~1 ~~~~~~ I S.I.~~ (~) labelled ~~~~M~~~-~q;)~~ (31) a the

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Additional Info : CBSE Class XII Board Solved Question Paper 2011 Applied Physics
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