AHSEC HS 2nd Year Question Paper 2022 Physics

Total ruunber of pages - 20
32T PHYS

2022

PHYSICS
( Theory )

Full Marics : 70
Pass Marks : 21

Time : Three hours

The figures in the nmrght irtdicttte full nmrks
for the tluestions.

Q. ,No. 1- utrries 1 nnrk aaclt Lx8 = 8

Q. No. 2 cnrries 2 mnr*s enclr
2x10 = 20

Q. No. 3 cnrries 3 nnrks eaclt
3x9 = 27

Q. No. 4 carries 5 mork; enclr
5x3 = 15
Totai = 70

Cotid.

I
I

1. Answer any eiglrt questions from the foilowing as directed :
fr&+tqTqR futrqt cid'rls{<Ee< +R+:
(n) How many electrons are there in a body if its total charge is
16x10-18C ? 1

6t <w qm {5 q{a< qRaH sfr 16 x10 18 c qg, [ucsrwas ft{fit
Era-+Ea qnez

(b) Which of the following options expresses Wheatstone bridge principle
as given in your textlrook ?

FEr< qt'E"IArc frrt qT{rfi sqs Bre{ m cqq& ffi Se Aw
ftfut er+m +c<r
.. R, R"
" R2 R4'

+=+;
R2 R4'
F&ur t, =o

R, _.2
..t
0n R. R.
: when i, + 0
=
R,

+=9;catu*ti,+o
R:r R4'
(lii) Both of the above express the principle
s"tR< Wrtrt ffiftfuB emFI sr<
(izr) None of the above exPresscs the principle.
e*m eBt fr-f,dc{I ftettl er<FFi i?Fr< I

(Atoose tle correct option)
@6 Vwt\t atfrbfreil)
(c) Which of Gauss antl Tesla is a bigger unit ? Write the ratio of 1 Gauss
to 1 Tesla. 1

flEeq$ 6wt< crrd.dt vte< qffi? 1 {&Eq$ 1 6Fr< q-{flv fiFnlat

32T PHYS 12l

(d) Fitl up the blank in the expression Wb = m2

Wb= m2 a51q <iFtr?\o cm
"trfr
tE tq mtr
(e) Which of the following optionq is correct ?-
Eqs fiTr 6$'Fm 6qq ea ?

I
@ v^2-- lto€o
* --Eo'
-2
.60

(tt) . - 1r-o"o-E?
(iiil Both the above options are correct.
€ef{< KTFI ffi ea r

(iu) None of the above.
€rl-{< eBi\e r-Q.{ |

(J) What is the angle between reilected and refracted rays when
Brewster's law is.applicable ? 1

sBt<< 1a er<isi: E?E dffi qK; qFryRs qfrq a1-q< mq ftm t<z

@) In a prism except the position of minimum deviation there are
values of angle of incidence producing same angle of
deviation. (Fill in tlrc blnnk)

frrw foft1 w<-Erq-< <rk< ..qDi A-qns €rcE @ cs'ici< <lc< ql"rsr
ml"r< nl{ cflrs 6fl @rfr rr7 "f <qr)

0n de Broglie inlg2lreasoned that nature was symmetrical and that the
two basic physical entities and must have
symmetrical character. (Fill in the blanks)
1

1924 D-{s & <arfr< nG wr<prr-o R e-fB q-{tE-{N qnfis q[s cqm aTG<

FB"fmn \rr+- qrfis ecfi qfffi qk qfir< t

?tfr,p F wr)
32T PHYS t3I C-ontd.

O According to Bohr's second postulate of quantisation, the angular
momentum of electron in the first possible orbit is- 7

.d-<rBfiq qrfi< << fi-ft €}-sr{ w{rR q{mtfrs eq:rcBt+wv AIT'I
t-ns" qBF df+sv+c<ei{<-
2tr
ri)
'' h

(it ^zhlt
(iit 2trll
.

(Cltoose the correct oPtior)
(eq V@4frt +tEVfre<t)
(j) Which of the following options is a correct unit of a diode's reverse
current ? 7

sqo Vcapts (T1,di 6_$q uBrs s!l-< "Fdq<q eKr5 eh sGF?
OA
(ii) mA
(iiii) pA
(lz,) None of the above.
(Choose the correct option)
(eq Aweit ilfrAfreflt)
(k) The act of transmission of information is .

(Fill in the blank)
1

Ecr ceFr6i ?Ki ofi qh t erfr tF t4 Nt)
-
(l) HrO is a polar / non-polar molecule. (Clroose tlrc correct zoord)
1

H2o €fi wftx/vwfta -v1r (s6 4ot1t <tfu \fueltl

32T PHYS t4 ]

2. Answel the questions /Fill in the blanks frorr the following : (mry ten)
\t{< 3xl{q{ E-e< +k<i7.rff }E eSq 4fu412 1fi7q17qy q<b1)
(o) O Drara, the iieltl lines betrvcen two charges + e, and - Q2, ln,hen
anothel charge +Q is placcrl betneen them in a str.aight line.

+ 81 qf+ - Qz vt{a
[it< ats\o {fr qq qA $rfl{ + e w+{Rsq?:<
Rl'H ffil sr, qI${ ki.l<I {lq\5 r+,e- c<?M{{qi{{ $<l I

oR / qelflt

(il Calculate tl-re electrical force betn,een tll,o 1C chalges placed
lOOcm apart. Given co = 8.854x 70't2C2N-|m 2. Mention
two smaller units of C . 7+1/2+Yz=)

'KeFr 100cm <]<{Fs aFFl 1tt rc wm< {Ms
qr$'l
kErG$ <-q
fi.fu o<Ir fiTi qrs eo = 8 B54x1o-t2c2N-tm r c-< 1tt x+
2
€+<F E-(H{ 6{l I

(b) (il Are the following diagrams equivalent ? If yes or no, calculate
the equivalent resistance between the points A and B in the
fig:re (ii) when the mid-points of the resistances are connected
by a conductipg wire. Y2+71/2= 2

Eq{ GE Fi cnpertr ? {fr q{ <t;r-tl, tro (rr-v A q<, B FaFt<
{qs cnpql c<t<r< "GTl"t a"m cl c<Gat mtr+ $r tt l<i fu es]q

4!)

4A 4()
(,) (II J

32T PHYS tsl Antd.

oR / qel<{t
(it What rdill be the total chalge q in a conductor having length I,
c'liameter D and electron densitl' n respectively ? 2

Fr(il ss {R<lft< &ri' r, $rq D sFl,@< qaq n {re, {R.{tt(fu
crst {b qr{4 q< aRa"i fta14 qk z

k) O Explain why a p.otentiometer is suitable than a voltmeter for
measuring em{ of a cell. 2

6oir< REIe,-Effs {d EPrfd {B sctffirres '4Bt n?tatrqtBr ftr
c<&E"trrifi TjI"lll Fl I
oR / q2l4t
(ii) A 10m long potentiometer wile has a resistance of 18 ohm' lt
the hvo enJs-of it are connected to a batterv of 5uolt, calculate
the potential drop per unit length with unit Giveu, internal
resistance of the batterY is 2Q ' 2

16- ftqa qsrE "idqG\ntfi< 6r{< c<I{ llohmt {fr ?gl< T< Ft
Suolt< @|fr sbft< ?{F ri({ltl cl Qs, cq(s el-{srq< a& e<x'
ffiiio q-<r Fe< alen effi-c< tTN 'i"tql cl fi$ qlcs drii< qqmt<
I

2e)t

(rt) O Static charges produce field, while nloving cl'rarges
produce field. 1+1':2

ft< qtnr* rsu 118 sr<, qFlqtts tt&fl<
qt{lci _ c5:e {& $(<l

OR / qaf<l
(ii) Write the analogous equation in electricity if ir-r magnetism it is
expressecl as i - ritxE and mention.the unit of fz ' L+1=2

sfi[r$qseBtqfiifiq r =mxE er, rezofigsfr'enseil<w{< i
ersFi ft ekfr"fl sfl4, m < sm Vcm< ett

32T PHYS t6l

(e) A Can a changing magnetic field exert force on a stationary charge ?
Also can a moving charge exert force/ torque on a stationary
magnet ? Try to give your answer by a brief statement of your
own' Y2+1/2+1=2

pr-+ cw-oa cH QBfi-< ql<f{< s"Fltr <at e(sltt sfi<
.c?F
"tffi{'
qt(<C{ qtrfi qbt qr<lf, qB
? {q'ltr6 eLTIfl +R< ? D{frq{ <d{rK
FEKEwfi-tq a{FIGII
oR/ q2l4l
(it In a rainy season you are running with your umbrella opened
in a place where the horizontal component of earth's r':nagnetic
field is 0.26 G. If the length of your umbrella is 80 cm and your
speed is 20km/ hr, calculate the motional emfdeveloped across
its shaft.
{<{cR {s<s cstcqFn q?F 5fu s&d pfr qG 6{B ffiR ?iq {b
v-!Ts cF€-< q-{9Fsb+i-r< m 0.26Gt{fr (sFil< qrfutK ffi
B0 cm qr+ csmi< EG 20 km/ hr aa, rels qfutR qewd< F T{<

flqE EE< Rt<l 1qT FTiq-u|q+ {f, ti6l{l cil |

(J) O A plane electromagnetic wave is propagating iu space along
x-axis. If the magnetic field compor-rent of the wave is as given
below, write an expression for its electric field. 2

7
Bo -- 2xlO sin(kx - a,t)

ebi m\r{ frwq-ptfi{ ER(5i Tqr$FJs x-wr< frct qox< ?qtqr lfi
s<irt(il< pqfid E"flfl sq<s fi$<q-F er$,.i cil E{, (g(s E<('l75Fr
fini< E+i.lrit 6+ r

oR / qel4l
(iil layer in the atmosphere plays a protective role, and
hence its depletion by gas is a matter of international
concern. 1+1=2
<1{{eqsqlTt ,
u<a 6-q+< a6a.sB <TI Gt<kr< Vfrsr
aql sfi qRcc ql+ c{r-T crtc< <lc{ RI'<l hF \q<s'T{
tfuar& qrs6&m Fst< +Nq ?q qRcct

32T PHYS L7) Contd.

@) 0 Rays paral1el to each otirer but not parallel to the principal axis.
of a concave mirror will meet after leflection at the
Draw a diagram in support of youl answer. 1i2+ 1y2=2

9KF"K qnrg<Fi fr,E A<n qsrF{ qnl-gsflEi [4|r{I{| <foflq S"FI q-<q4
qlc"fiqE sGrl-s Rt{< trfrBsqkrcqarcVw<
"flqe
qrqhs ,!fr Ga si<+a mi t

oR / qel{t
(iil Writc fzlo conclitions fu. o.oy to suffer total internal rcflection.
1.+1:2
qfi <ft< sreisAq "l.ldfrTEq sBta erc-<]qd cqt.<t fDl6 frqt

(lt O Hor'v manY L)rocesses are there to produce induced emf or current
as mcrrtioned in vout textbook ? If an arca ,4 is placed in a
magr-retic fielcl B so that the trormal to the arca makes 45'with
the magnetic ficlcl, rvhat n,ill be the flux through the area ?
1/2+11/2:2

qtR?. FEie.-uf++ Eq <i kfq Eq"ld r.kiF (\g.iTK
"fl'J]fcre F€l
q-*fu< oq Bre< qtrq ? {fr €",r;r trirs c'$E B-s a$ftil sr r'trqr{

; q6rr A?q <.f i<q c<til< er& rss< E i\o 45' mlq $r<, cErs
c,+<< qrsfi "fl< & c$<t slq< {R.di"i fr{F{ q< ?

oR / q2l4't
(it State Lenz's law. Name the other law of nature that it obeys.
7+7=2
rEq< To.il fr+ r e1B< ql4 cordfir Ic E:nft ECE t

O O Write the mathematical expression of the postulate that an
electron has to strictil' follow in order to revolve round the
nucleus. Name the scientist who proposed it in 1913. L+L=2
' te<Ed eDR FtufuF bIRe:FlcE, $ t
?trffiE qtE !-E-',-lK rrfi
Efi-{dfi{t fucfi< anink+ er+t'rqFnd fr"n r rgre Edig fi-$1t'61
qrK.6rRt fi@6iqd< a]a fr3Jr

32T PHYS t8l

oR / qalol
(il Calculate the energy in joule tl'rat is equivalent to-l,MeV. 2
ftltq qs rfu 1 Mev< mgar, a6trr €r r

O O The total energv of an electron in the first ol'bit is -13.6 ey. Does
it mean that-
(A) tl-re electron is bound u,ith th6 nucleus ?
(B) energl, will be required to remove the electron to infinity ?
1+1:2
sqffi 5qqe6 qm sB ffii< f5.iG -t:.o.y1a{-qtrr €?6t
TqRq ({ft c{ -
(A) tcE4lEr6i rdgl-s{lE1< cTCs sFh ?
(B) ?re.srct wfu fHe dlgEE fr-d{ {rE {k sI{rq;T {< ?
oR / qal4t
(t<) (t The transistor works as an amplifier, with its emitter-base
junction- biased and the base-collector junction
biased. ln this state the transistor is said to be in
:.-
- state. 1/2+yz+1=2

qfitf<-c<q qI(5rE <Hlq ql<, c<E-{cE}< qlicds
.<lTflCerGlri sRr4 dGEKdT(< qR<h'ffirq dr $Z3 | sE
qrEr" 6fB?<dl q{Els q$l1ft cotctett
oR / ,w2l4l
(i, What are logic gates ? Draw the symbol and write tire truth
table of a NOT gate. 7+1/2+1/2=2

eks c5i'ift r NOlE&-s c5i't<ffi-sGetitfrot<Eq 6Rqft,fir
(l) (i) What do you understand by ihe terms sigrrnl and noise in
communication system ? 1+1:2
c{ifltc<lri <Frqis riFE qK qFlts 5fi-ca ft 10t t

32T PHYS I9I Contd.

oR / w?ffi
(it The approximate bandwidth required to transmit
is 2OkHz and to transmit is.4.2 MHz.
6qqq alEaa <I-C< e|C-{-q;[ 6q-{f "{ft.<{ qK 2OkFIz SFr.
(eK"i $R{-< <lR 4;2MHzt

J. (n) O Sl'row that in a particular way of combination of capacitors the
equivalent capacitance C is expressed as given below and name
the particular combination. 2+'1,:3

C = Ct + C, + Cs +...........* C,,

cq'{€<l F {F<K .qs ktrR q-qls qrgEI <l{-$gs €"i<lE CT ioq<
fi$<qrs er$T"i Gt q-{ q+ c& Rcfi qqtrtt< qN fr"tt r

C=Ct+Cr+Cs+. ..*C,,
oR /w<&7
(it Mention nt lenst ttoo factors on in'hich capacity of a capacitor
does depend. Define the unit of capacitance. Find out the
dimensions of capacitance using the dimensions of charge and
potential differencd. t/2at/2alat=J

qF one ftr or<-q $en B-F"l st E nDryo$o {r+fr {<$q fi-6<
s1F I SF-{q< qffi q(E't fi$ \fl{i{ qK,Fs<< Tlqt <I{qK ffi qK-+E<
I

uoi frfr mtr
(b) (n Show that current in each resistor of the following diagram is
zero. J
cats<f R EEs frriffit< dGlt] c{t{G Tksifr RtrE< "lRrfq
tl
B3VC3VD
-{*f
10e)
[,on ffi ,on
12 .r. ..-Ltl.-*
H 3V G 3V F 3VE

32T PHYS [10]

oR / q,elvl
(it What do you mean by mobility of mobile charges ? Whether it
is positive or negative. Show that mobility is expressed as giverl
' below, where the symbols have their usual meaning.
1+Y2+\1/2:3
ql{FK qF{ol fieE ft {ql ? E :ntq+ fi <rcllgs ? &-{€<l c{ qsqsl
sqs fr{|<qT< emFI sil E{, {b <I{qs c(r<Nracqqtr<IF< qd{q
+kcqr
ET
m

G) O I and Bk are electric and magnetic fields respectively placed
..
in a region. A charge q is moving with velocity ,i into the

region. If F" = ' Fo,show that , =
'/r. Name the arrangement
ofEandBfields. 2+7=3

rj vr+ r[ @rl ?<1rfuoq<,yrfia mo6n,eBqsE\oqi"]dmi
?<q r eB q{d q, ui scqn trB $R Es csuq T"FE er-<'t $FIq t {fr

Fe = -F, Eq, fi-{s<t A = yB I B qK B-ffiri E'{n-< rwnir< <r
"
<lT{dl< a1n fd{r

OR / qq?t

(it What is a galvanometer ? A galvanometer has a resistance of
50O. If across its terminals a resistance of 5() is connected,
calculate the fraction of current that flows through the
galvanometer. 7+2=3

cn-drw'fiEF ft r ,.sA crrd-Nd'fibF< c{l( soo | {fr RIl< F T<<
{Ms 5() 6<l< ciRffl Frt q{, FCs (rrdrq''FEt{cbF Tlrgfi {5
etr< fiffi q$l eRtfu {< rt"FI Gt I

32T PHYS [11] Contd.

(d) O What is mutual inductance ? S, and S, ale tu,o long coaxial
solenoids of radii r, and rr, where r, .. rz . Sr. and S, have
equal lengths l. If n, and n, be the number of turns/length and
.I, be the current flowing tluough S, , fiud an expression for

mutual ir-rductance MD of S, with respect to 52. 1.+2=3

efsfc{.lsft l s, qFF s, kU qo€rfrEsT,vfir r, qI+ 12 Eh
q q+ d, < <irqtdq+ r, <r, r {c{F[ esfi< ffi / r afr n, q14"
n, Tefi 1B< q&,.am ffi< efls ci?BI qFF s2< $Frfr a-qfo fiWq
.r2 q{, Fcg s2 clc'lrs s1< eiElrsrr eclts Mrz{ qB er$.Klft
fi"fu <tr
gI< I qel<l

(it Two concentric coils having radii r, and r, are placed coaxially,
where r, <rr. Obtain an expression for mutual lnductance M,
of the inner coii with rdspect to the outer coil. Define self-
inductance. . 2+1=3

t els rz <ircl6< Eil s$rqa ,{ofr{ Tsfi q$lfrrv]I< q"F cl
?<q, s'o r, << r, r <lk< gefi}FF qlc'fts &Effi $sfrciN eqmqo
s6ilis Mr2 <,48t ffil fifr wttErrL{.i e6fl(c c(@l fr{t
(e) O . Arrange the following words, so that it becomes a meaningful
sentence.
"A parallel plate capacitor of very 1ow frequency cannot pass
through an alternating current."
Write in brief about the neecl of displacemen, .r.r",.,.
,*r=,
sEs fiiil wqT(Q]s <bt vel1.f <t+i aiSq Gl r

'sB q& Tr s-"iilrc< q'ilsriE "lts {rqq {ffi emrsftefi "1l<
q1 5K't6< t'',
c<6i e4l5 qfT{Ifi{sl< qq.r\9=4 Dt$ fr?fi t

32T PHYS l-121

oR 1qq41
(iil Write M (Microutaues), U (ntrauiolets), R (Radio tuaues),
V (Visible u.taues), X (X-rags), I (Infrared Luaues) ar.d
' G (Gamma rays) in the order of decreasing frequency.
Give a short description of nny one of the following :
"l+2=3

(A) Sky rvaves (B) Space waves
-r-ngcll{T--"FltKEM({fu ?<s),u(qfu<qfu ),R(6<fu 'E<('1),
y(E t{l{ \r<('i), x(,ss'<ft), I(q<r{Ifu <ft) qr+ c(flN <fr)<s
fi"il
Estr ftlt ftror+ qFK.eA<E u*o F{ r

(A) qrslfi E<(tl (B) Tqfsn v<(ti
(J) O A beam of light converges at a point P. If a lens is placed in the
path of convergent beam at a distance ol 12cm from P, at what
point does the beam converge if the lens is a convex lens o(
focal length 2Ocm? Draw a neat diagram of it. 2+7=3

("r5< <fu"iq sB fu{ fu p-?q qffi ?<qrffi P-fi&r}F"Rt
12cm gsu-, qffi <fi[F.f<< tBqqs 2ocm ThlR ffi< eoli
EEE crE q"r{ sil q{, Nzgqlqfrs <fue<< $\o qffi qk t bt<
,{bi "iRs-i< 6s qs$a $R<i r

oR / q44t
(i0 State superposition principle of waves. Mention nt least one
exarnple of coherent source of liglrt. What will be the phase
difference between two light waves, if the path difference
between them is 2'5i ? 1+1/2+11/2=3

u<(tFI q{]t(<lq"F ftfuB fr"tf r c"Ir<< csE Eq{< w& rzqe 'aFl
EqE<q frq I {fr k?r ('iE< E<(tFl rfw< {q {tsi
2'5,1 qn, curs
ft{s< lrqs q.fl ftt$d Ek ?
"tlcfur

(g) (i) The kinciic energy of an electron is 12O eV' Calculate its
momentum and sPeed. 112+1t7'=3

sB ?cE-+E-.i< fl&{B 1,2o ev r Qlt< v+c<ot qFl, a.fu ti"td1 o<l I

32T PHYS [13] Contd.

oR / Er?ffi
(it Write a few lines on any one of the followir-rg : 3

(A) Wave nature of rnatter
(B) Davisson and Germer experiment (no need to draw
diagram).
. EEs frTf firf,Fil afPs ea1<u ffi fun e

(A) "tntcF{ E<(a erfF
(B) cufuq qK,qtrk {fiq.t (tr{< q(s-{ fiqrrtqq) I

0n O Name the formula given below. Using the value
l.Og7 x 10-7 m-| , rf needed, find the wavelength of -Fro line.
Arrange H u, H p and H , lines in the spectrum of hydrogen in
the order of decreasing wavelength. t/2+)+t/2:J

fr$ I {fr gc{l-q-{'qn', 1. o97-xto-7 m-r $d.& <r-<-{-<
s-E< wtil< qln
oR H, K{rsw< s<(tfrqf frfr +-$ rqRglsq 1ffi1 r{o, H,, qK.
H). sq6afura e-aEl-{rn is<iaffi fu'l(q {rqKI I

1:Rf f
7-"\2, -fn, )
)

. oR / qal?rt

(it Name the processes of the following nuclear reactiont, ,yrr6=3
E-{< ffi-fi{ Rfu$qTK ffi fr<t s

(A) -330 rn +) ue
(B) "z'U
??P -1f; s *a +v

(C) P-+n+e'*v
(D) 'on *33'u -+tf; xe+ ![sr + 2ln
(E) lu+ltt -?H+e* +v+o'42Mev
' @ n->P+e+V

32T PHYS 114]

(i) O Draw a neat and labelled diagram of a full-wave rectifier
. indicating the primary and secondary of the centre tap
h'ansformer, two junction diodes, one load resistance and a
capacitor for filtlation of ripples. Moreover the wave pattems
after passing tluough each diode and also through the load
resistor. 11/2+Y2+1/2+1/2=3

eA cFtK 6t &q+t<< 1<I qr{, cft"iTefi, ktt qiiS vFIE, sDl
q< mr+ q+ Effot ftA< $R-dd sA {K+ 6&s sR €H "I"1-\t{ia
c(frlq fr qfo r?:fl< EqRs q{E St< errlsr< lrcqfr qK sK
cl<rsl Trsfr 4< ?c c{l<I 5{(tF C({'l qKq +il I

oR / q4qr

An Describe ally one optoeieckonic junction device mentioned in
your textbook. 3

Fl{K "tti-j{far5 qo ftora qFl q(q1s ?tr{+Efr-$ sKq ffi"rd <fdl
" Glr

'4.(n)(r\Atrhatisanacgenerator?AcoilofareaA'numberofturnsiV
is rotating in a magnetic field E with steady angular speed ro'
Show that the systetn Senerates aiternating current or emf at
any time t. Draw a graph of e vs t' Name three types of such
generators. Y2+Y2+1/2+t/2+3=5

affi gaq$qexqs fr r a m-qrE qFs iv 'iFF{e- €h TN,fi €"F
qtRl cn{\e<l ({ qEfuBr< fr(slr{t
ET$ ffiEs ro dft+ E"fu< nR
,n-"e effiq<l FTrq El4s <Ei $qeflq1 A6q t e-< frqfrre
t-<
"*"
C{1 qifi Fl I sr{ tt<"K &fi gsl-{< $q'[[fi am frq r

Contd'
32TpHys t1sl

oR / q?Rt
Gi) Define rms value of ac. Show that the ratio of rms value of ac
to its peak value is O.7O7. An electric bulb which operates at
.12V dcis connected to an ac source and glows normilly, what
would be the peak value of the source ? 1+3+1=5

tffi eq< ri-v <rftd \F< rigl fr".n r cqlso c{ qR{q eH{< qv
<{po an \fl<, ?$< qr{E {ri< w{t[5 0.207 t t2v dc-e on cil
.ch aE,4it qffi er<r< bqqr< p- qinTit sRrf, ? qt{r<fslr< Eh
WrEqlrtt< qr{w qn frm v-d r
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(iil Discuss ac voltage connected to a resistor (R/. \Ahen an inductor
Q) ana a capacitor. (C) are connected to ac voltage separately
then the currents in both the cases are expressed as given below.
Writ'e a few lines on each of the following. 1+1t/z+1t/r=s
qil 6Ef<rs /Rf6 hr5o ci{s qffi fiw >i-9rf qffi cI |
letr$
lclrs c{fu qil src{"ts (r) q+ €il {Ks (c)-r< ?cF qa {ffi
Fv< q<zstat Gr ql, KIFF msg g<tqEEE fi$<qc< er$H cll q{t
afutrc s"r<o c+?flffi$ B{tr

i=i-sin (rr-ft)
i =i^sin(rr*l)
(b) O Find out an expression for fringe width in Young s double slit
experiment. Light of wat,elength 500 nm is incident on two slits
which are 7mm apart.lf the screen is placed at a clistance of 1 m
from the slits, calculate the fr.inge width of the fringe pattern
formed on ,the screen. 3+2:5
t{w fr-fu ,tftsls qF F${ sB s$FtR.rft fi.fu ffi I 1mm nr{$is
qm
kB fu< eq<o 5o0nm q{iaftqtt< 6exqq qra&s ?qcqt {fi fu<"Kt
'"ttft E<v 1rn ql, cre-Cg "lrfuIft 66afraq< qE c<< uttat +<l r

32T PHYS [16 ]

oR / qzkl
(il) \a/hen the double slit in Young's experiment is replaced by a
single slit, name the pattem of fringes formed on the screen.
What is the phenomenon due to which we see colours when a
CD is viewed ? Mentron nt least one drfference in the fringe pattern
observed due to interference and diffraction
phenomern. Describe a simple experiment by which you can
observe the diffraction phenomenon in your no*ur.*r*r*r=,

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** aftqq< dlx ft sk ? c{B$ q1;r cD tq DId, 9ls {erst <(
c(ftf{ 'tNil .sE qRS{t ft l wrc<"r* \qF" q'K6 {Rtrilfu
1E o-<t {EIEK rlqo w& ale .clt "il?Fsr Emq Gill
qrl
,!Bl
qt<w +fi< ottR-<t
-{A$i <f{t ffi frcttv pfr v"r+fi 4R&I {-<tE t

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(lil) VIhat do you mean by polarisation of light ? Name the law
which gives us the intensity of emergent light when passes
through a polariser at different angles. Mention fzoo ways of
observing polarisation as described in your textbook. State
Brewster's law. Find oui the Brewster angle when there is
transition of light from air to glass.
( Hints : tanl'S=0'026, sinl'5= 0'026, cosl'S=0'99,
' ton-t 1'5 = 56)
."lt/2+1/2+1/2+1/2+ 1+ 1=5

c"ilq<< ITa5q firn Yfr fr:gt r frel {E? qB q'"tr6s, rtrqfr
RGa mqs "il< k cq1rt ({r<< Ose=K qRqq frca ei< 4{ ft ?
csmr< "tl.afqrs <fi't ql fAqae Em"i mtfr nbm qqlo q"rc6
,lfiel q:fr<sq +R< q<r ffi | <;BF< 1q1tt fi'att I c<&$ cllQ< <l1<"Ki'
tfikn qeFrq !6, cfr csEtr <.EK coq fiafu stt
( kliis, tanl'S=0'026, sinl'5= 0'026, cosl'S=0'99,
tan tl.S = 561

32T PHYS l17l Contd.

(c) (0 Write an expression.for mass defect using L,M, Z, mo, A, fln
and M where the symbois have their usual meaning. Define
binding energy. of a nucleus. Obtain the binding energy in MeV
of a nitrogen nucleus. 1+1+3=5
Givery

N )= t4.oo3ozu
^(';
m, - 7.OO7B25u
mn = 1 008665u

1u - 931 SMeVf c2

qF<tr< qcl er$l.t +li c(Ks LM, Z, m
o , A, m^
ql+ M <I{qI{ +fi
s+ttF< sil er$H<tfi E{ r FGFItw T{d{fu c<gl firt I qA {&tc1{
Ffuls$Fffifl&' Mev-s est-rt o{r
futsrq,
. /," \
m\?'N )=14 OO3O7u
m, -1.OO7825u
mn =I 008665u

lu = 931 .5MeVlc2

oR / q?F{l

kn Draw a schematic labelled diagram of a nuclear reactor based
on thermal neutron fission. \Arhat is a moderator ? Give izoo
examples of moderator. Write a few lines on controlled
thermonuclear fission. l/z+ 1+Yz+Yz+ 7Yz=5
etfrr frtd< EFT cisFs fus;r efu ffiA{ ffi qh Effi 6s
giis| fiTl:rs fr I fim-q<
| faEh<"i A{ firfrs qqfrgfi{ q(r$q{<
I

eq<s c+ffin franr

32T PHYS t18l

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(iii) You are given two circuits consisting NAND gates as shown
below. Fill up the kuth table for each. Are NOR gates considered
as universal ? lt Yes or JVo, answer why. 2+2+1=5

NAND (fl1tr{ lts Ft <r6ft sas cq-rlfiqr< cetdis cqtsrt {E Ee}-
I

6R-r ElF "F Gtl NoR crtt affi{ (rt'i Brq ? {fr as <I nsr,

A
B

A B Y A B Y
0 0 0
0 1 0 i
1 o 1 o
1 I 1 1

(") (b)

_x_

32T PHYS [1e]

32T PHYS [20 ] 47"