Past Year Paper, Physics (Set - 1), Delhi, 2014, Class 12, Physics Class 12 Notes | EduRev

Physics Class 12

Class 12 : Past Year Paper, Physics (Set - 1), Delhi, 2014, Class 12, Physics Class 12 Notes | EduRev

 Page 1


Series : OSR/I
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Please check that this question paper contains 15 printed pages.
o 
Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
o 
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 on the answer-book during this period.
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Page 2


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togs rrlrr-s,r { 
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Please check that this question paper contains 15 printed pages.
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Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
o 
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 on the answer-book during this period.
dfrofTdrrC*erfun)
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atfti*dq eir : 70
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<'a fe 
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(v) sFr-w t aqrt 
q-* 
*H fuw re? * r dqtfu, El 
dirit 
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w 
srr 
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qai 
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c:3 x 108 m/s
h: 6.63 x 10-34 Js
e.: 1.6 x 10-19 C
$o:4nx 
10-7TmA-l
1
-;-:9 
x 109 Nm2 C-2
+TEEo
m":9'1 x 10-31 kg
General Instructions :
(i) All questions 
qre 
compulsory.
(ii) There are 30 questions in total. 
Quet;ion 
Nos. I to I are very short answer type
questions and carry one mark each.
(iii) 
Question 
Nos. 9 to 18 carry two marl$ each. 
Question 
Nos. 19 to 27 corry three
marks each and question nos. 28 to 30 carry 
jive 
marl<s each.
(iv) One of the questions carrying three marks weightage is value based question.
(v) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marla and all three questions offtve
marla each weightage. You have to attempt only one of the choices in such
questions.
(vi) Use of calculators is not permitted. However, yott moy use log tables if necessary.
(vii) You may,use the 
following 
values of physical constants wherever necessary :
c:3 x 108 m/s
h: 6.63 x 10-34 Js
e: 1.6 x 10-19 C
Po:4nx 
l0-7TmA-l
I
-;-:9 
x l0e Nm2 C-2
+7t,eo
m.:9'1 x 10-31 kg
55nn 2
Page 3


Series : OSR/I
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togs rrlrr-s,r { 
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so 
q{.T 
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gsrq.rxrrt6. 
wqyqffi r
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Please check that this question paper contains 15 printed pages.
o 
Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
o 
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 on the answer-book during this period.
dfrofTdrrC*erfun)
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, 
atfti*dq eir : 70
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airwt 
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(iii) wr 9 dra C sdsew 
qt 
ii€w 
* 
sfl tg d zz I sA6wq dTr ei€w 
*dqr sw
2s d 30 
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frq etiow 
t r
(iv) dT+ ffi dd wn C d 
<'a fe 
al?nfTd 
rv-+ * I
(v) sFr-w t aqrt 
q-* 
*H fuw re? * r dqtfu, El 
dirit 
zrd 
w 
srr 
i 
d?q tiof 
ad 
w
r*r C.ril?- 
qfu 
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etflfu 
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qfr 
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ew 
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sqlrr wsol t t
(vii) 
qai 
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qtfrr 
fuiq;f n 
qwf 
w aqqlq +r nrd' * ,
c:3 x 108 m/s
h: 6.63 x 10-34 Js
e.: 1.6 x 10-19 C
$o:4nx 
10-7TmA-l
1
-;-:9 
x 109 Nm2 C-2
+TEEo
m":9'1 x 10-31 kg
General Instructions :
(i) All questions 
qre 
compulsory.
(ii) There are 30 questions in total. 
Quet;ion 
Nos. I to I are very short answer type
questions and carry one mark each.
(iii) 
Question 
Nos. 9 to 18 carry two marl$ each. 
Question 
Nos. 19 to 27 corry three
marks each and question nos. 28 to 30 carry 
jive 
marl<s each.
(iv) One of the questions carrying three marks weightage is value based question.
(v) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marla and all three questions offtve
marla each weightage. You have to attempt only one of the choices in such
questions.
(vi) Use of calculators is not permitted. However, yott moy use log tables if necessary.
(vii) You may,use the 
following 
values of physical constants wherever necessary :
c:3 x 108 m/s
h: 6.63 x 10-34 Js
e: 1.6 x 10-19 C
Po:4nx 
l0-7TmA-l
I
-;-:9 
x l0e Nm2 C-2
+7t,eo
m.:9'1 x 10-31 kg
55nn 2
1. ffi 
qra-oit 
eTr+{r 
qrqit+t rrhrff,m qft qRqrqr 
tdfuq r s{r"Fl s.r. 
q-rs'tmfug 
I
Define the term 'Mobility' of charge carriers in a conductor. Write its S.I. unit.
2. ffi 
qre+.rnrr 
*i 
qg 
lcrrcarff fq'qr 
rrqr 
t ,
C(t):2 sin (8nt) volt.
msdq fu'{f, 
qvtiq q-flr{stte,t 
d{'r t I frgdr qrsi*.{m *ifuq r
m(t)+€it
tQ-+.cif
The carrier wave is given by
C(t):2 sin (8zrt) volt.
The modulating signal is a square wave as shown. Find modulation index.
m(t) in volt
t in second
3. 
o'fu.fr 
fi oTraqr 
frq-{ +fuq, ffi tc-€t 
rffli q-61, qqfuqq 
ysfuE-d 
q+{ 
+ sffirmq{d
E]_dr t r" 
q{ qelq 
dr gk*ifrq r
"For any charge configuration, equipotential surface through a point is normal to the
electric field." Justifu.
4. uuil-{ Hr{yr * 
qt ,iltrs, 
Fr+ri 
\,-*- 
qr{ 
6T f,srT (s{r 
qiq 
or t, 
W 
Fq t 
qqn 
ffi 
t 
qq-fr
q{fl.r{rqq-i 
t r 
erri 
t st{ {r 
riltrs qrfi qrqrd q[+'r 
eY{Bif r
Two spherical bobs, one metallic and the other of glass, of the same size are allowed
to fall freely from the same height above the ground. Which of the two would reach
earlier and why ?
5. 
qrs'if 
nm *-q-or tsq 
it 
+lw 
CTt-il 
si 
qftrirrs-dr 
m'r kqrur 
tprtgq 
r
Show variation of resistivity of copper as a function of temperature in a graph.
55nfi 3
lP.T.O.
Page 4


Series : OSR/I
ilil*,. 
55llll
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Roll No.
&rd
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Candidates must write the Code on
the title page of the answer-book.
. 
Errqrql"qord 
togs rrlrr-s,r { 
Eiff 
gw ls t r
o 
s{trr-{:r 
it 
Erk+ wr +1 erk 
flqq.rqstsrqr *t ur* 
gtr-gRr*,r 
* go-ysqr 
leri r
o grffit 
frq or ti t*;gq 
q'{ct-rr 
it 
so 
q{.T 
t r
o 
slrTryFrsTssqfrqrilvgsuri.rirrEd, 
gsrq.rxrrt6. 
wqyqffi r
o gtYFt-rl,tft'rqdi+fuq 
15 fo{e*.t{rrrittqqrrqrt r 
qw-q{*rfl+ffiurFiqril 
to.ts 
qi
tsqr 
qrftn 
I 10.15 Tq t 10.30 
qQ 
ro on i;+e 
qFr-rr 
s) 
qilri 
"ilr 
E{i 
crcftT 
*^ +{T A
e+r giw*l 
qr 
*t€ wn 
qrT 
fui,i r
r 
Please check that this question paper contains 15 printed pages.
o 
Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
o 
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 on the answer-book during this period.
dfrofTdrrC*erfun)
funfu €42{ : 3 
Eitl 
PHYSICS (Theory' 
, 
atfti*dq eir : 70
Timeallowed:3hoursJ 
tMaximumMorlcs:70
vrqrqF*sr:
(i) wfiypq atffit 
r
(ii) 
wwrwilgaso rwf tsnr t dr a*- ivw etfu-@qrFrf,*pqeb 
r+.
airwt 
t
(iii) wr 9 dra C sdsew 
qt 
ii€w 
* 
sfl tg d zz I sA6wq dTr ei€w 
*dqr sw
2s d 30 
if ydqyw 
frq etiow 
t r
(iv) dT+ ffi dd wn C d 
<'a fe 
al?nfTd 
rv-+ * I
(v) sFr-w t aqrt 
q-* 
*H fuw re? * r dqtfu, El 
dirit 
zrd 
w 
srr 
i 
d?q tiof 
ad 
w
r*r C.ril?- 
qfu 
eliqt 
qd 
dH wit 
if atrafwqw 
yqrq 
fuqr rqr t / 
dd fi"ri t oilw]
r?+r/d 
qqitt 
d#dir 
qaeqrf,arz* 
I
sstttt 
I 
1p.T.O.
(vi) *e-fd-cr # Brzqirr *? 
etflfu 
d? * r aq tfu 
qfr 
erwqq 
al al 
ew 
Wrudq 
avot w
sqlrr wsol t t
(vii) 
qai 
arnvqq 
al 
ew 
Wafud 
qtfrr 
fuiq;f n 
qwf 
w aqqlq +r nrd' * ,
c:3 x 108 m/s
h: 6.63 x 10-34 Js
e.: 1.6 x 10-19 C
$o:4nx 
10-7TmA-l
1
-;-:9 
x 109 Nm2 C-2
+TEEo
m":9'1 x 10-31 kg
General Instructions :
(i) All questions 
qre 
compulsory.
(ii) There are 30 questions in total. 
Quet;ion 
Nos. I to I are very short answer type
questions and carry one mark each.
(iii) 
Question 
Nos. 9 to 18 carry two marl$ each. 
Question 
Nos. 19 to 27 corry three
marks each and question nos. 28 to 30 carry 
jive 
marl<s each.
(iv) One of the questions carrying three marks weightage is value based question.
(v) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marla and all three questions offtve
marla each weightage. You have to attempt only one of the choices in such
questions.
(vi) Use of calculators is not permitted. However, yott moy use log tables if necessary.
(vii) You may,use the 
following 
values of physical constants wherever necessary :
c:3 x 108 m/s
h: 6.63 x 10-34 Js
e: 1.6 x 10-19 C
Po:4nx 
l0-7TmA-l
I
-;-:9 
x l0e Nm2 C-2
+7t,eo
m.:9'1 x 10-31 kg
55nn 2
1. ffi 
qra-oit 
eTr+{r 
qrqit+t rrhrff,m qft qRqrqr 
tdfuq r s{r"Fl s.r. 
q-rs'tmfug 
I
Define the term 'Mobility' of charge carriers in a conductor. Write its S.I. unit.
2. ffi 
qre+.rnrr 
*i 
qg 
lcrrcarff fq'qr 
rrqr 
t ,
C(t):2 sin (8nt) volt.
msdq fu'{f, 
qvtiq q-flr{stte,t 
d{'r t I frgdr qrsi*.{m *ifuq r
m(t)+€it
tQ-+.cif
The carrier wave is given by
C(t):2 sin (8zrt) volt.
The modulating signal is a square wave as shown. Find modulation index.
m(t) in volt
t in second
3. 
o'fu.fr 
fi oTraqr 
frq-{ +fuq, ffi tc-€t 
rffli q-61, qqfuqq 
ysfuE-d 
q+{ 
+ sffirmq{d
E]_dr t r" 
q{ qelq 
dr gk*ifrq r
"For any charge configuration, equipotential surface through a point is normal to the
electric field." Justifu.
4. uuil-{ Hr{yr * 
qt ,iltrs, 
Fr+ri 
\,-*- 
qr{ 
6T f,srT (s{r 
qiq 
or t, 
W 
Fq t 
qqn 
ffi 
t 
qq-fr
q{fl.r{rqq-i 
t r 
erri 
t st{ {r 
riltrs qrfi qrqrd q[+'r 
eY{Bif r
Two spherical bobs, one metallic and the other of glass, of the same size are allowed
to fall freely from the same height above the ground. Which of the two would reach
earlier and why ?
5. 
qrs'if 
nm *-q-or tsq 
it 
+lw 
CTt-il 
si 
qftrirrs-dr 
m'r kqrur 
tprtgq 
r
Show variation of resistivity of copper as a function of temperature in a graph.
55nfi 3
lP.T.O.
6. ffi rt-o af{ +i ffi vqo-o E{rr +sq#i[ rer 
rrqr 
t r 
gq 
{i+fi *'erq{ 
q{{qtqt 
t
20 cm 
Xt 
qrfis-d 
ffi 
ffi*-n 
frq sr 
qfrkq 
ES kq *rffi t r itq 6t st*.€ 
1t 
wr
tr I
A convex lens is placed in contact with a plane mirror. A point object at a distance of
20 cm on the axis of this combination has its image coinciding with itself. What is the
focal length of the lens ?
fq+iq 
qt 
B { +'r V t.rfuqn ffi 
sTra{r * 
qnq 
diz-s glq+iq {d F +fuq 
qfl+n 
Fq
tt t*qmfrfuq 
r 
ss 
gq+iq 
eia +i fq{n Hr t ? t
Write the expression, in a vector form, for the Lorentz magnetic force F due to a
charge moving with velocity 3 in a magnetic field d. Wnut is the direction of the
magnetic force ?
++ fmlfi 
qrq-o{qrcqq€Tr 
*.r Ri-s'oTn-q Rqr 
rrqr 
t | 'x' ERI 
qrqikd 
ffirqq 6i 
qcqrnu
strq*r+r sd frfiqq I
I
rl-JI
qs{rqt-d
frt*o. {i{r l{,r-d
The figure given below shows the block diagram of a generalized communication
system. Identifr the element labelled 'X' and write its function.
t- 
- - - - - - - - -l
tl
7.
8.
Transmitter
Message
Signal
Receiver 
I
Message
Signal
9. 
qi 
gq*iq 
q-qprT 
fr t 'A' ft1 srik*- 
SEwflGdT 
qm. 
t go aftro t, sqfu 'B' ftt 
qm,'t
m.q t | 'A' 
eil{ 
'g' 
qqnfr 
fti 
q-fid qEqrt+g 
r 
rq 
rqrqT +i gq-+tq u-qfu 
q-ars*..ffi qenr
auner*'?
Out of the two magnetic materials, 'A' has relative perrneability slightly greater than
unity while 
oB' 
has less than unity. Identiff the nature of the materials 'A' and 'B'.
Will their susceptibilities be positive or negative ?
wqlrr-
o.df
55nn
Page 5


Series : OSR/I
ilil*,. 
55llll
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Roll No.
&rd
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fuf r
Candidates must write the Code on
the title page of the answer-book.
. 
Errqrql"qord 
togs rrlrr-s,r { 
Eiff 
gw ls t r
o 
s{trr-{:r 
it 
Erk+ wr +1 erk 
flqq.rqstsrqr *t ur* 
gtr-gRr*,r 
* go-ysqr 
leri r
o grffit 
frq or ti t*;gq 
q'{ct-rr 
it 
so 
q{.T 
t r
o 
slrTryFrsTssqfrqrilvgsuri.rirrEd, 
gsrq.rxrrt6. 
wqyqffi r
o gtYFt-rl,tft'rqdi+fuq 
15 fo{e*.t{rrrittqqrrqrt r 
qw-q{*rfl+ffiurFiqril 
to.ts 
qi
tsqr 
qrftn 
I 10.15 Tq t 10.30 
qQ 
ro on i;+e 
qFr-rr 
s) 
qilri 
"ilr 
E{i 
crcftT 
*^ +{T A
e+r giw*l 
qr 
*t€ wn 
qrT 
fui,i r
r 
Please check that this question paper contains 15 printed pages.
o 
Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
o 
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 on the answer-book during this period.
dfrofTdrrC*erfun)
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PHYSICS (Theory' 
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General Instructions :
(i) All questions 
qre 
compulsory.
(ii) There are 30 questions in total. 
Quet;ion 
Nos. I to I are very short answer type
questions and carry one mark each.
(iii) 
Question 
Nos. 9 to 18 carry two marl$ each. 
Question 
Nos. 19 to 27 corry three
marks each and question nos. 28 to 30 carry 
jive 
marl<s each.
(iv) One of the questions carrying three marks weightage is value based question.
(v) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marla and all three questions offtve
marla each weightage. You have to attempt only one of the choices in such
questions.
(vi) Use of calculators is not permitted. However, yott moy use log tables if necessary.
(vii) You may,use the 
following 
values of physical constants wherever necessary :
c:3 x 108 m/s
h: 6.63 x 10-34 Js
e: 1.6 x 10-19 C
Po:4nx 
l0-7TmA-l
I
-;-:9 
x l0e Nm2 C-2
+7t,eo
m.:9'1 x 10-31 kg
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1. ffi 
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I
Define the term 'Mobility' of charge carriers in a conductor. Write its S.I. unit.
2. ffi 
qre+.rnrr 
*i 
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lcrrcarff fq'qr 
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t ,
C(t):2 sin (8nt) volt.
msdq fu'{f, 
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d{'r t I frgdr qrsi*.{m *ifuq r
m(t)+€it
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The carrier wave is given by
C(t):2 sin (8zrt) volt.
The modulating signal is a square wave as shown. Find modulation index.
m(t) in volt
t in second
3. 
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"For any charge configuration, equipotential surface through a point is normal to the
electric field." Justifu.
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Two spherical bobs, one metallic and the other of glass, of the same size are allowed
to fall freely from the same height above the ground. Which of the two would reach
earlier and why ?
5. 
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nm *-q-or tsq 
it 
+lw 
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Show variation of resistivity of copper as a function of temperature in a graph.
55nfi 3
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6. ffi rt-o af{ +i ffi vqo-o E{rr +sq#i[ rer 
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20 cm 
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wr
tr I
A convex lens is placed in contact with a plane mirror. A point object at a distance of
20 cm on the axis of this combination has its image coinciding with itself. What is the
focal length of the lens ?
fq+iq 
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diz-s glq+iq {d F +fuq 
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tt t*qmfrfuq 
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ss 
gq+iq 
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Write the expression, in a vector form, for the Lorentz magnetic force F due to a
charge moving with velocity 3 in a magnetic field d. Wnut is the direction of the
magnetic force ?
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The figure given below shows the block diagram of a generalized communication
system. Identifr the element labelled 'X' and write its function.
t- 
- - - - - - - - -l
tl
7.
8.
Transmitter
Message
Signal
Receiver 
I
Message
Signal
9. 
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Out of the two magnetic materials, 'A' has relative perrneability slightly greater than
unity while 
oB' 
has less than unity. Identiff the nature of the materials 'A' and 'B'.
Will their susceptibilities be positive or negative ?
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wr d'n ? 2
Given a uniform electric field B 
: 
5 x 101 i N/C, find the flux of this field through a
square of l0 cm on a side whose plane is par;llel to the y-zplane. What would be the
flux through the same square if the plane makes a 30" angle with the x-axis ?
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For a single slit of width "a", the first minimum of the interference pattem of a
monochromatic light of wavelength I occurs at an angle of 
;. 
At the same angle of
)"
[, 
we get a maximum for two narrow slits separated by a distance "a". Explain.
12. 
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11.
A
B
Write the truth table for the combination of the gates shown. Name the gates used.
Identify the logic gates marked 'P' and 'Q' in the given circuit. Write the truth table
for the combination.
A
B
Y'
Y'
55nfi
lP.T.O.
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