Physics Plus Two.pdf - model question papers

i
Second Year - March 2011
Code No.9015
For Schena-I Candidates only
Time : 2 Hours
Cool-off time : l5 Minutes
Pafi - III
PHYSICS
Maximum : 60 Scores
Generul lttstruLtions to Candidates :
o There is a 'Cool-offtime' of l5 minutes in addition to the \rriting time of2 hrs.
. You are not allowed to write your answers nor to discuss anlthing with others during
the'cool-offtime'.
o Use the 'cool-offtime' to get familiar with questions and to plan your answers.
. llead questions carefull) before answering.
. All questions are compulsory and only intemal choice is allowed
. When you select a question, all the sub-questions must be answered from the same
itself.
. Ualcula
o Malayalam version ofthe questions is also provided.
. Cive equations wherev€r necessaiy.
. Electronic devices except non-programmable calculatorsare not allowed in the
Examination Hall.
rnldcqgoeantrE
'
. rtdqlq m>ocooroiloi
"4ooo 15 ol.rnd 'eloa, aco.d ooso' g6rEcoil(oldolo. @"9
fiuoo(rNoi corcoJ@BoEod goooo o{)g}o')cc(T,c, og}ggololocao,il orE

l. A body of mass m is charged lr
negatively. State whether th€
following statements are tnrc or
false.
(s)
During charging' there is
change in mass of the body.
(b) The bodY can be charged to
2.5 e where e is the charge of
an clecuon.
(c) While charging the bodY bY
induction new charges are
created in it.
(d) The force between two
charged objects is less when
thsre is a medium between
them lthan in vacuum]
(% x 4--2')
m o9fiu)gg ool ol(r\j(oloflo(f'
oo@g1ci csrgco:t dcde' o,lgl(m)
o,Coq oloaol(m LoJfiU(oc'xno'oA
ooollccoc o(ocgs ooctt ooel(o16.
(a) dodd o.rqlaoucuo
(r|d(o)oilooe ocad olJloJcm)od5)crDl
@) ocnirolojlcl 2.5 e
'lc6€{
oa,cs)@ocoi
(ruc(r)l6o)o'
(e gela;cLsc5rr'loaa
"6cmrd'
dcdd GrO6nJ.)
(c) claoemo od,c6rE 'xfi$'olojloo,lc{dd
oalgloclcoa
d{(oilo) dc{Eslaqo ctuJ'qil
doodslcnl.
(d)
dcdtetgg
ot(r$o)l@oet4olso)1oi
ocojoo 9o6rcdlon
(o,ool
o5rrg
6roJ
a,lo.rlc(otoil@olo. IsDl(nJ@@jle{ggo'ilo.n
cocold'}ildl
(vz x 4=2)
2.
Name the electomagnetlc waves
used for the following applications'
2.
o)cog 6locol(m Cdolao|o.)CD@Boidd
gdrc@cuildolcD oooloJ)@&cooto'
(o)oo('@Bglos oolooe)(!tlo''
(a) lmaging of bones in human
bodY.
(b) Mobile Phone communication'
(c) Remote contol ofT.V sets'
(d)
orrl.orj oool.ooriloel GD((un}
o,g]os lilL(')o o{)s)dofm(dtrD'
(c)
(b) oocoo5Tdd c"oc6ni olcdototcoitdloaoo|oild.
51.ojl. oaDgld,giloel olcocs
d,616c!scalegil(d
(d) For sterilizing
instrumenis
9015
surgical
(Y' t 4 =2)
(d) (r\)6s1€od goro,q6m6sBoi
(o.5tn) ojlold(ooc€ol(mldild
l%x4=2)

, 3, Consider the logic aircuit uslllg 3.
NOR gates given below :
NOR c(,r)glo,ui O;la(ocutd
g5rccd6rloi5lgg (o)gos o,c5rDlfi)
aerc€slid au6@,Jt5 6tono'leotra'.
B
(a) Wdlt the truth table for
circuit,
(b) Identify the logic operation
which this circuit is
performing. O)
th€
(a) p.e m>66yffloofl L')OP
(r) os5DIqA 609](u'14, o)
(b)
eO.c

5. 100 c)
5.
100 cl
(a) Find the equivalent resistance
ofthe above circlrit
(l%)
(a) @c nD6.6$!ilooa (r\)^oer
LoloilGC)c(Do 66r|3loi5loolo''
(rv, )
(b)
Determine the current through
(b)
75 O Ldojlcocoolo)lejlos@]gp
oo.tloj)(' L"lolcdo
(l'lLol(o)
the 75 C) resistance (r%) (r% |
o,c6mla,
o, Television broadcast is done bY
space wave mode ofpropagation'
(a) What is the difference
.
between sky wave and space
\\ave modes ofPropagatiL'n I (l)
(b) A TV transmission antenna is
81 m tall. tlow much seNice
area can it cover if
the
receiving antenna is at the
$ound level ?(Radius
ofearth
is 6400 kml
Ql
7. sometimes when we switch off the
etectrical equiPments. a spark is
seen within lhe switch This is
explained on the basis of
' electromagneticinduction'
(a) What is self induction ? O)
6. oseiloil.oioA lo)oJo@Bglos
mic"-rmi Goloi
o'l(oilcoltelc6n; (T)gorol(rt(d.
(a) mioo@, aoroi [orca'eoi5m
@1(oil(o)lo auc"ial coloii
Ldca,lud6m o'loiol" r6tDzlel)BA
d-\ro,,\ctruo ^O
l)
(b) ool sl ol'1. Lolcaai6i5m
ajroogl.r,dad 8l olgd
goroo]od.
LdjcaItloldl])o
Ldlcdgdl5mo
eicjoc;tlc ?
lcloil(oJ)os csrg(oo 6400 htu] (2)
aDna,o:l@6rl(m GDall(r) (oo
(rilo*ild Grgo6me;loi Ldrcasl-
".rem ogcflrneo] 'rJ?Jc d0Lo)
oilcg1old6lqo|onoi @,]D
7. ooattoJl(d, gdla'o6rn@r3oa ocnd
o,lgfu cruoo)orli'ieicCcra
aDn4il(r,lgEloE'nioJc66d d'conco)6n{
oooloj}(D a'ccota'
ci"-roem

(b) Cunent in a circuit falls from
5,A to 0A in 0.1S. If an
average emf of 200 V
is
induc€d, determine the self
inductance ofthe circuit O)
(b)
6l(0l rudo,Jl5loer oooroJlot
Lololcdo ot'ltctlo, sA-co:l(d
nari 0A GDaoit 0 l S-oE
a,]o{o}ff}. @oc0o@1200 V
@,"Oo."O"n. cLdo6mo o'19-
oqlsyrn)oo100,103, mr60'J151-
oo{ o.ruoa"-d Pdiru,qoicti
er6rBlojlslool@,.
(l)
8. The captain of a ship sailing in the
Atlantic Ocean has to tlavel in the
north direction to rsach the nearest
port. He finds that the magnetic
declination of the present position
of the ship is 5'22'East.
8.
(oodelcalld m)olt6olojloi m)ooroll6ol(m
oo] o,Ceiloel d,Jcol"gd
oloc5s]oo (o]oo]5-!od "Oolocoi
osao; cltrooooed m)6Dlo1c@o6rBortr6ri.
a,gd Podc{rA nfloi@ol(rr)
(rDaerotonooe @,cdojla, rutdgilc(r.,.eicl
5"22' (o,1e€6Y) cro6rd.
(a) What is meant bY magnetic
d€clioalion ? O)
(b) The captain has a magnetlc
compass needle with him BY
how much angle and in which
direction should he deviate his
ship from the north direction
pointed bY the magnetlc
compass needle to reach the
port? O)
(a)
(b)
6,ccon6, oljl$lc(n,s\a o{)(rr,.Joi
"O@i ?
eJ
@,cooaDl,j 96n9. ootc5s}(dro

9. R€ntya makes the following oircuit 9.
to mdasure the emf of a cell
4ilo1€olcY, aDAd,Jls g6tRc€6tlml.
'
She says that the voltm€ter reading
will give the emfofthe cell.
(a) The PhYsics teacher says thal
it is not Possible to measure
the emf of the cell in this uaY'
Jusd$ this stalem€ttl.
(b) Explain with a circuit diagram
tfffirE$idd to measure the emf
(l)
of a cell with a Potentiometer
if
You are given another
standord cell (whose e m f is
kno\tt) (3)
OR
9. The th€rmat v€locity of electron $
about 106 n/s and drift velocity is
about I 0-3 m-/s
(a) what is meant bY &ift
veloctry /
(b) Obtain a reldi€|r between drift
0)
velocity and clectrie cunent (3)
9.
€Qao flDd6,J1:iloer aolcdgalg{i
ol(lDl6ld cocol(o166tlo gq.ooro..Ood'
6{)fiij ool aloo)l(Irrl.
(a)
(gorDlc"jtr6, !8o
"olauldad
o'loril(Dld o(ll)Cibq
fS."Oo."O.d. 6{81.'idl@cd

10. ln inteference and diffractiol of
light, dark and b ght bands are seen
on th€ screen.
(a) Do these Phenomena violate
thc law of conseryation of
energY ? Explain. (r v)
(b) ln an interference Pattem, the
ratio of maximum intensity to
minimum intensitY is 36 : 9'
l'ind the ratio of amplitudes
inreNities of the two
interfeling waves.
10.
tdec@ooilonl @oliodooaAaJ,
oltt oc6'9iai ot]56itrtao L"ioil@cdDeBEild
PQ@)5rc(o)lo (olo,csoocooco)(o)loco)
6DlcoicDld,oi fi|j161-
(IioA @'c6modslml.
(a)
@.e t Jotk3c(rl)eueiloE godee
dDooo,9i6lY, crilo)oo el""eil-
€oodslff)lc6rr3c
d,o1l6ole,.
? ojl0o61-
(r%')
(b) ool Pnfldo"nocdau orag-
6nnd @,lslco Ldld'c@
o,lL(ll(o(o)lo, 61C,51010.) lol6c@
oii'.uroco;o o)ooilellgE
oacn;.lcoro 36:9 (sro5tt'
(r)s(oot](m
@alaodooaAau
@ooo6ltBglos
(6ro.o)oila'gr
os@lo (d)lLojoteglos@lo
6618)-il5l
ll.
A series LCR AC circuit has
great practical importance' It is used
for tuning radio, TV, wireless sets
etc.
(a) Obtain an exPression for
current in a series LCR AC
circuit using Phasor diaglam (3)
1 l. 5'0l (rl)'lo1r|J LCR dO mt'
(rudaJl5loj
olgoo@qt6o
L.rcc@cqjle, LoJc(r)c(nJo 96r€'
Gro(i Gooiloaoc, s'l.ojl., olaordoerad
ofiug)6,o4 @l966B1roolo1'd
s51en;loolai 9"Jco)c(/il€o)(ml'
(a) c6.(r\)d o!.ot('o golcao)cq'l4
61col cu1ol('d LCR
'O'ml'
(rDda,JlSloel oo(|lRJl(d'
L.lojc.o
(o'l(ol(odod 6l'0l
aDoolca,Joeo5lEotol6
(3)
9015
(b) Under what condition, this
circuit is used for tuning ? (1)
(b) p'e (rl)dd,Jls sjl6rrn5srtoi
g.lococqjld6rcdi d'glo)lmoi
.O6qoocn? (1)
P.T.O.

12. You are sitting in a r6om in vihich a
'
13.
uniform magnetic field B exists. At
the cente of the room a charged
particle is suddenly projected
horizontally and il stans circular
motion in the horizontal plane.
(a) What should be the direction
of the magnetic field for this
to happen ? (l)
(b) Will there be a change in
kinetic energy of the Particle
due to this circular motion ?
Why ?
(l)
(c) A cyclotron uses a magnetlc
.field and an electric lield to
increase the . energy of a
charged particle. Describe its
construction and working. (3)
To emit a ftee electron from a metal
surface a minimum amount of
energy must tre supplied.
(a) This energy is called -
(b)
9015
(7')
State three methods to suPPlY
this energy to the ftee
elecfton..
(l%)
(c) When light of ftequencY
7.21 x l0la Hz is incident on a
metal surface, the ma-rdmum
. speed of the ejected electrons
is 6 x 105 rn/s. Calculate the
threshold frequencY for the
m€tal. (3)
12. n{'a'16,5otoc(o) 6l(0] ' a'cooil6,
o6rrDero B (rnelcril(fldoJ(m o(ol
oJ.ilo.jld c,l5sBon pokol(m].
oJdaolos o(Djr3c(.r)oro,l dfi;
oo)
ooorr'jJ.o a,6rDo "{O(oo))
Olod A@l
oilo('all(r) otel(oorloE 6o6gfJJ(m].
(a) @6!BorD ruoe.rll@ol(m(oil.d
@,cooild, o5rnDeiGroioae l31@
o4;CrOrCOr'lOlOOemo ? (1)
O) gq.ID (116(610,]9 de|(rto od,cfira
oooi€Jlo, @,6m('tdrlool
U)oilc4,cdesoto'lci ocgo
mJoGOfldOlCOC ?
"oclo}l
oo,c6tg ? (1)
(c) 6'o1 oo(Ddcgcalsc6rrild
ooorRJlo, 66m@IJg)Os 9'9(&
eeco oxiathil€ocd oo.lBlJo
o6rnDelor)o 6,cooil$ 06lTllr_
el(ulo 9dlcoc('ocsJ(dld))(ml.
ooal)dcgccLs'tmloal tets_
(rr(o)lo LdjolTEotD(r)o{o oilooo"l-
6,o:ldola,. (3)
13. 6r(0) cetc"o t"lorelo|oilo8 (rilcrtJ
perdcLsc5rDla,og m)@Lc.Docdocoa
5t(ol dluojlo' dl(ol6w'@
9.01aego aqfoal(roJ0c6ri.
(a) po g.cde-eotdnci
oO(mJ olocol(rD]
(b) gc g|'deeo o.e,cslatl.rDotct
(c)
(v,')
3 ocdgl6sBqa t"J(rdo)c.ril')ola,.(l%)
7.21 x l0!a Hz rorqoSoroil-
!o)gg LdJ6'c@o o@l ceJcdo
LoJoeioroiloi "loil.oolcallcq8
o{oorotl olo}.m PeldcLsc6ml-
6,glos 6Joocoj(|t GOJ(')OT
6 x 105 n/s croosmoilo8,
eeJc4ooDtootr oL('cdelc0irui
Grooljooil6,6m€ocdol6,. (3)
I
I

14. Bohn proposed a new model ofatom
to ovelcome a problem of
Rutherford's atom model.
(a) Which specific problem of the
Rutherford model was
attempted to be solved bY
Bohmodel ? O)
(b) What are the basic Poshiates
ofBoh model ? . (3)
(c)
The radius of the inner most
electron orbit of a hYdrogen
alom is 5.3 x l0-ll m. What
are the radii of the n = 2 and
n=3orbits? A)
14. ot|o6o"oe{Acui dogo oocoleiloer
ool t rodoo
"lo1ldoo1€olff)oil(r)l-.
coJ6rE'loc6rd c6rtcd Goco!(d
ni16aQ('oll€oodgd.
(a) olLoric"ocdori cocnejloel
(orsd.rroc6nl c6rucd
"6d
ooc(DeiloE doloooil€ooai
(b)
(c)
6no14d ? O)
c5l)lcla cocu)eiloeJ @DgkrDnca)
Ldlocdm5Erioi d$o.6t$co ? (3)
oog oo"olor.raaa Gqg(oonoel
"ogo)o
eeclerleg @eidotsc6ni
6rc66Dildlool (drgoo
5,3 x l0-rr m crgsr#. n=2 9o
n = 3 @lo GO{o ocd6nJlgl@,-
g;os orEoo ? A)
"61ro
15. A capacitor is a
901s
storing charges as well as energy. It
is bas€d ort a propertY called
capacltance.
(a) write the sl unit of
(b)
(c)
aapacitance and deflne it.
You are given two capacito$
of 2 pF and 3 pF. What are
the maximum and minimum
values of capacitance that can
be obtained by combidng
(f)
them ? (2)
Obtain an expr€ssion for the
electrostatic energy stored in a
capacitor. (3)
c(ocdcg€gorlo cuocol6ol.m
6r(0l gorcutaoc6nJ 4dcmtgd. @d
odcaulgaiad oofiD ('l5mo(oo
trqL@otd td.jol6otoil€otcml.
(a) o'dcnDlgoisuloae SI Ql6rrtd
cro(oilo(r) (rndqf
"Oeloil
(f)
"jl@olo,.
O) crn5msad6l 2 pF Oo 3 PF 9o
edecrDlgaid 999 o6rE
d"dcmtgo)o,0o o,(rrtlolldol(ml.
pQoro(o o,lsloq&
6o)c(nrcoa 6,15co{o o8go{o
orerlo,lo
d4gorJo
oelololoco d,dcru18(#
mlAoi do(ot ? (2)
(c)
5lo) d,dccDlgcnd cruoreolg!-
@1€6rl(m ooorlJJootcti@eo|otd
cloorcoJo@,o6rBolo)ld,. (3)
P.T.O.
a

16. A lens of a particular focal length is
made from a given glass slab bY
adjusting radii of curvatue. The
.formula
used in this case is lens
maker's formula.
(a) write lens maker's formula. (1)
(b)
Derive lens maker's formula
assuming formula for
refraction at a sPherical
surface. (3)
(c) Is it possible for a given lens
to act as a converging lens in
one medium and a diverging
lens in another medium ?
Why ?
(d) Compare the focal length ofa
given converging lens for blue
light with that using red light.
Are they equal or different ?
why ?
OR
16. A microscope is a device used to
9015
obtain magnified images of small
objects.
(l)
(a) Draw a labelled raY diagrarn
(l)
of a comPound micruscoPe
forming an image at the near
point ofthe eye.
@,
10
16, rocrriloloo;

(b) Obtain an expression for the
magnification Produced bY a
compound microscope. (2)
(b) nol auocol€ro m.1a's8o-
Bdsolrn P6nec,ooJclT)
(grg.udoD(Do
a,5lrq}ojl5ldol(m(6td
srol m)oocojo rr'ldaDco6rDo
oerglo' Q)
(c) If
the objqctive l€ns is
immersed in a transparent oil,
what will haPpen to the
resolving power of
the
microscope ? IliPlain. (2)
(c)
cruge'doodcrol