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

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

 Page 1


55/3 1 P.T.O. 
narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð 
>na Adí` {bIo§ & 
Candidates must write the Code on the 
title page of the answer-book. 
 Series OSR/C 
H$moS> Z§.      
55/3
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {dkmZ (g¡ÕmpÝVH$) 
PHYSICS (Theory) 
{ZYm©[aV g_` : 3 KÊQ>o   A{YH$V_ A§H$ : 70 
Time allowed : 3 hours Maximum Marks : 70 
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 16 h¢ &
? àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na
{bI| &
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >30 àíZ h¢ &
? H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, àíZ H$m H«$_m§H$ Adí` {bI| &
? Bg  àíZ-nÌ  H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h¡ &  àíZ-nÌ H$m {dVaU nydm©•
_| 10.15 ~Oo {H$`m OmEJm &  10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-nÌ H$mo n‹T>|Jo
Am¡a Bg Ad{Y Ho$ Xm¡amZ do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
? Please check that this question paper contains 16 printed pages.
? 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.
? Please check that this question paper contains 30 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 on
the answer-book during this period.
Page 2


55/3 1 P.T.O. 
narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð 
>na Adí` {bIo§ & 
Candidates must write the Code on the 
title page of the answer-book. 
 Series OSR/C 
H$moS> Z§.      
55/3
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {dkmZ (g¡ÕmpÝVH$) 
PHYSICS (Theory) 
{ZYm©[aV g_` : 3 KÊQ>o   A{YH$V_ A§H$ : 70 
Time allowed : 3 hours Maximum Marks : 70 
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 16 h¢ &
? àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na
{bI| &
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >30 àíZ h¢ &
? H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, àíZ H$m H«$_m§H$ Adí` {bI| &
? Bg  àíZ-nÌ  H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h¡ &  àíZ-nÌ H$m {dVaU nydm©•
_| 10.15 ~Oo {H$`m OmEJm &  10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-nÌ H$mo n‹T>|Jo
Am¡a Bg Ad{Y Ho$ Xm¡amZ do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
? Please check that this question paper contains 16 printed pages.
? 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.
? Please check that this question paper contains 30 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 on
the answer-book during this period.
55/3 2 
gm_mÝ` {ZX}e :
(i) g^r àíZ A{Zdm`© h¢ & 
(ii) Bg àíZ-nÌ _| Hw$b 30 àíZ h¢ & àíZ 1 go 8 VH$ Ho$ àíZ A{V-bKwCÎmar` àíZ h¢ Am¡a 
àË`oH$ EH$ A§H$ H$m h¡ & 
(iii) àíZ 9 go 18 _| àË`oH$ àíZ Xmo A§H$ H$m h¡, àíZ 19 go 27 _| àË`oH$ àíZ VrZ A§H$ H$m 
h¡ Am¡a àíZ 28 go 30 _| àË`oH$ àíZ nm±M A§H$ H$m h¡ & 
(iv) VrZ A§H$m| dmbo àíZm| _| go EH$ _yë`naH$ àíZ h¡ & 
(v) àíZ-nÌ _| g_J« na H$moB© {dH$ën Zht h¡ & VWm{n, Xmo A§H$m| dmbo EH$ àíZ _|, VrZ A§H$m| 
dmbo EH$ àíZ _| Am¡a nm±M A§H$m| dmbo VrZm| àíZm| _| AmÝV[aH$ M`Z àXmZ {H$`m J`m h¡ & 
Eogo àíZm| _| AmnH$mo {XE JE M`Z _| go Ho$db EH$ àíZ hr H$aZm h¡ & 
(vi) H¡$bHw$boQ>a Ho$ Cn`moJ H$s AZw_{V Zht h¡ & VWm{n `{X Amdí`H$ hmo Vmo Amn bKwJUH$s` 
gmaUr H$m à`moJ H$a gH$Vo h¢ & 
(vii) Ohm± Amdí`H$ hmo Amn {ZåZ{b{IV ^m¡{VH$ {Z`Vm§H$m| Ho$ _mZm| H$m Cn`moJ H$a gH$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks 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 marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
Page 3


55/3 1 P.T.O. 
narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð 
>na Adí` {bIo§ & 
Candidates must write the Code on the 
title page of the answer-book. 
 Series OSR/C 
H$moS> Z§.      
55/3
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {dkmZ (g¡ÕmpÝVH$) 
PHYSICS (Theory) 
{ZYm©[aV g_` : 3 KÊQ>o   A{YH$V_ A§H$ : 70 
Time allowed : 3 hours Maximum Marks : 70 
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 16 h¢ &
? àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na
{bI| &
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >30 àíZ h¢ &
? H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, àíZ H$m H«$_m§H$ Adí` {bI| &
? Bg  àíZ-nÌ  H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h¡ &  àíZ-nÌ H$m {dVaU nydm©•
_| 10.15 ~Oo {H$`m OmEJm &  10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-nÌ H$mo n‹T>|Jo
Am¡a Bg Ad{Y Ho$ Xm¡amZ do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
? Please check that this question paper contains 16 printed pages.
? 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.
? Please check that this question paper contains 30 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 on
the answer-book during this period.
55/3 2 
gm_mÝ` {ZX}e :
(i) g^r àíZ A{Zdm`© h¢ & 
(ii) Bg àíZ-nÌ _| Hw$b 30 àíZ h¢ & àíZ 1 go 8 VH$ Ho$ àíZ A{V-bKwCÎmar` àíZ h¢ Am¡a 
àË`oH$ EH$ A§H$ H$m h¡ & 
(iii) àíZ 9 go 18 _| àË`oH$ àíZ Xmo A§H$ H$m h¡, àíZ 19 go 27 _| àË`oH$ àíZ VrZ A§H$ H$m 
h¡ Am¡a àíZ 28 go 30 _| àË`oH$ àíZ nm±M A§H$ H$m h¡ & 
(iv) VrZ A§H$m| dmbo àíZm| _| go EH$ _yë`naH$ àíZ h¡ & 
(v) àíZ-nÌ _| g_J« na H$moB© {dH$ën Zht h¡ & VWm{n, Xmo A§H$m| dmbo EH$ àíZ _|, VrZ A§H$m| 
dmbo EH$ àíZ _| Am¡a nm±M A§H$m| dmbo VrZm| àíZm| _| AmÝV[aH$ M`Z àXmZ {H$`m J`m h¡ & 
Eogo àíZm| _| AmnH$mo {XE JE M`Z _| go Ho$db EH$ àíZ hr H$aZm h¡ & 
(vi) H¡$bHw$boQ>a Ho$ Cn`moJ H$s AZw_{V Zht h¡ & VWm{n `{X Amdí`H$ hmo Vmo Amn bKwJUH$s` 
gmaUr H$m à`moJ H$a gH$Vo h¢ & 
(vii) Ohm± Amdí`H$ hmo Amn {ZåZ{b{IV ^m¡{VH$ {Z`Vm§H$m| Ho$ _mZm| H$m Cn`moJ H$a gH$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
55/3 3 P.T.O. 
(vii) You  may use the following values of physical constants wherever necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. {X`m hþAm J«m\$ (AmboI), Xmo g§Ym[aÌm| C
1
 VWm C
2
 Ho$ {bE, {d^dmÝVa ‘V’ Ho$ gmW
Amdoe ‘q’ Ho$ n[adV©Z H$mo Xem©Vm h¡ & XmoZm| g§Ym[aÌm| _| n{Å>H$mAm| Ho$ ~rM n¥WH$Z (Xÿar)
g_mZ (~am~a) h¡, {H$ÝVw C
2
 _| n{Å>H$mAm| H$m joÌ\$b C
1
 H$s VwbZm _§o A{YH$ h¡ & J«m\$ _|
H$m¡Z-gr aoIm (A `m B) C
1
 Ho$ g§JV h¡ ? AnZo CÎma Ho$ {bE H$maU {b{IE & 1 
The given graph shows variation of charge ‘q’ versus potential difference 
‘V’ for two capacitors C
1
 and C
2
. Both the capacitors have same plate 
separation but plate area of C
2
 is greater than that of C
1
. Which line (A 
or B) corresponds to C
1
 and why ? 
2. g§Mma ì`dñWm _| ‘{d_mSw>bZ’ nX H$m Š`m A{^àm` hmoVm h¡ ? 1 
What does the term ‘demodulation’ in communication system mean ?
3. AdVb Xn©U na EH$ g_Vb Va§J Amn{VV hmoVr h¡ & namdV©Z Ho$ níMmV² ~mha AmVo hþE
Va§JmJ« Ho$ AmH$ma H$mo Xem©BE & 1 
Draw the shape of the wavefront coming out of a concave mirror when a
plane wave is incident on it.
Page 4


55/3 1 P.T.O. 
narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð 
>na Adí` {bIo§ & 
Candidates must write the Code on the 
title page of the answer-book. 
 Series OSR/C 
H$moS> Z§.      
55/3
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {dkmZ (g¡ÕmpÝVH$) 
PHYSICS (Theory) 
{ZYm©[aV g_` : 3 KÊQ>o   A{YH$V_ A§H$ : 70 
Time allowed : 3 hours Maximum Marks : 70 
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 16 h¢ &
? àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na
{bI| &
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >30 àíZ h¢ &
? H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, àíZ H$m H«$_m§H$ Adí` {bI| &
? Bg  àíZ-nÌ  H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h¡ &  àíZ-nÌ H$m {dVaU nydm©•
_| 10.15 ~Oo {H$`m OmEJm &  10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-nÌ H$mo n‹T>|Jo
Am¡a Bg Ad{Y Ho$ Xm¡amZ do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
? Please check that this question paper contains 16 printed pages.
? 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.
? Please check that this question paper contains 30 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 on
the answer-book during this period.
55/3 2 
gm_mÝ` {ZX}e :
(i) g^r àíZ A{Zdm`© h¢ & 
(ii) Bg àíZ-nÌ _| Hw$b 30 àíZ h¢ & àíZ 1 go 8 VH$ Ho$ àíZ A{V-bKwCÎmar` àíZ h¢ Am¡a 
àË`oH$ EH$ A§H$ H$m h¡ & 
(iii) àíZ 9 go 18 _| àË`oH$ àíZ Xmo A§H$ H$m h¡, àíZ 19 go 27 _| àË`oH$ àíZ VrZ A§H$ H$m 
h¡ Am¡a àíZ 28 go 30 _| àË`oH$ àíZ nm±M A§H$ H$m h¡ & 
(iv) VrZ A§H$m| dmbo àíZm| _| go EH$ _yë`naH$ àíZ h¡ & 
(v) àíZ-nÌ _| g_J« na H$moB© {dH$ën Zht h¡ & VWm{n, Xmo A§H$m| dmbo EH$ àíZ _|, VrZ A§H$m| 
dmbo EH$ àíZ _| Am¡a nm±M A§H$m| dmbo VrZm| àíZm| _| AmÝV[aH$ M`Z àXmZ {H$`m J`m h¡ & 
Eogo àíZm| _| AmnH$mo {XE JE M`Z _| go Ho$db EH$ àíZ hr H$aZm h¡ & 
(vi) H¡$bHw$boQ>a Ho$ Cn`moJ H$s AZw_{V Zht h¡ & VWm{n `{X Amdí`H$ hmo Vmo Amn bKwJUH$s` 
gmaUr H$m à`moJ H$a gH$Vo h¢ & 
(vii) Ohm± Amdí`H$ hmo Amn {ZåZ{b{IV ^m¡{VH$ {Z`Vm§H$m| Ho$ _mZm| H$m Cn`moJ H$a gH$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
55/3 3 P.T.O. 
(vii) You  may use the following values of physical constants wherever necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. {X`m hþAm J«m\$ (AmboI), Xmo g§Ym[aÌm| C
1
 VWm C
2
 Ho$ {bE, {d^dmÝVa ‘V’ Ho$ gmW
Amdoe ‘q’ Ho$ n[adV©Z H$mo Xem©Vm h¡ & XmoZm| g§Ym[aÌm| _| n{Å>H$mAm| Ho$ ~rM n¥WH$Z (Xÿar)
g_mZ (~am~a) h¡, {H$ÝVw C
2
 _| n{Å>H$mAm| H$m joÌ\$b C
1
 H$s VwbZm _§o A{YH$ h¡ & J«m\$ _|
H$m¡Z-gr aoIm (A `m B) C
1
 Ho$ g§JV h¡ ? AnZo CÎma Ho$ {bE H$maU {b{IE & 1 
The given graph shows variation of charge ‘q’ versus potential difference 
‘V’ for two capacitors C
1
 and C
2
. Both the capacitors have same plate 
separation but plate area of C
2
 is greater than that of C
1
. Which line (A 
or B) corresponds to C
1
 and why ? 
2. g§Mma ì`dñWm _| ‘{d_mSw>bZ’ nX H$m Š`m A{^àm` hmoVm h¡ ? 1 
What does the term ‘demodulation’ in communication system mean ?
3. AdVb Xn©U na EH$ g_Vb Va§J Amn{VV hmoVr h¡ & namdV©Z Ho$ níMmV² ~mha AmVo hþE
Va§JmJ« Ho$ AmH$ma H$mo Xem©BE & 1 
Draw the shape of the wavefront coming out of a concave mirror when a
plane wave is incident on it.
55/3 4 
4. `{X EH$ Mwå~H$ H$mo AmaoI _| Xem©E JE AZwgma, g§Ym[aÌ H$s Amoa bo OmE±, Vmo ßboQ
(n{Å>H$m)> A H$s Yw«dVm Š`m hmoJr ? 1 
Predict the polarity of the plate A of the capacitor, when a magnet is 
moved towards it, as is shown in the figure. 
5. {H$gr MmbH$ H$s bå~mB© ‘l’ h¡ & BgHo$ Xmo {gam| Ho$ ~rM ‘V’ {d^dmÝVa h¡ & Bg MmbH$ _|
Amdoe dmhH$m| Ho$ Andmh doJ Ho$ {bE EH$ ì`§OH$ {b{IE & 1 
Write the expression for the drift velocity of charge carriers in a
conductor of length ‘l’ across which a potential difference ‘V’ is applied.
6. Cg eV© (à{V~§Y) H$m C„oI H$s{OE {OgHo$ AÝVJ©V, H«$m°{gV {dÚwV² Am¡a Mwå~H$s` joÌm|
H$s CnpñW{V _|, H$moB© BboŠQ´>m°Z A{djo{nV J{V H$aVm ahoJm & 1 
Write the condition under which an electron will move undeflected in the
presence of crossed electric and magnetic fields.
7. g§Mma H$s ‘{~ÝXþ-go-{~ÝXþ VH$’ VWm ‘àgmaU’ {d{Y`m| _§o A§Va (^oX) {b{IE & 1 
Distinguish between ‘point-to-point’ and ‘broadcast’ modes of
communication.
8. Vmn-d¥{Õ Ho$ gmW {H$gr YmVw H$s à{VamoYH$Vm _| d¥{Õ H$s ì`m»`m H¡$go H$s OmVr h¡ ? 1 
How does one explain increase in resistivity of a metal with increase of
temperature ?
9. (i) {H$gr I Ymamdmhr Aënm§e 
?
l d go 
?
r Xÿar na, Mwå~H$s` joÌ Ho$ {bE ~m`mo – gmdQ>© 
{Z`_ H$mo g{Xe ê$n _| {b{IE & 
(ii) EH$ d¥ÎmmH$ma nme (byn) Ho$ Ho$ÝÐ na Mwå~H$s` joÌ Ho$ n[a_mU (_mZ) Ho$ {bE 
ì`§OH$ {b{IE, `{X nme (byn) H$s {ÌÁ`m r h¡ Am¡a Bggo EH$ AMa (pñWa) Ymam 
I àdm{hV hmo ahr h¡ & Bg Ymam-nme Ho$ H$maU CËnÞ joÌ aoImAm| H$mo Xem©BE & 2
Page 5


55/3 1 P.T.O. 
narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð 
>na Adí` {bIo§ & 
Candidates must write the Code on the 
title page of the answer-book. 
 Series OSR/C 
H$moS> Z§.      
55/3
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {dkmZ (g¡ÕmpÝVH$) 
PHYSICS (Theory) 
{ZYm©[aV g_` : 3 KÊQ>o   A{YH$V_ A§H$ : 70 
Time allowed : 3 hours Maximum Marks : 70 
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 16 h¢ &
? àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na
{bI| &
? H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >30 àíZ h¢ &
? H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, àíZ H$m H«$_m§H$ Adí` {bI| &
? Bg  àíZ-nÌ  H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h¡ &  àíZ-nÌ H$m {dVaU nydm©•
_| 10.15 ~Oo {H$`m OmEJm &  10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-nÌ H$mo n‹T>|Jo
Am¡a Bg Ad{Y Ho$ Xm¡amZ do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
? Please check that this question paper contains 16 printed pages.
? 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.
? Please check that this question paper contains 30 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 on
the answer-book during this period.
55/3 2 
gm_mÝ` {ZX}e :
(i) g^r àíZ A{Zdm`© h¢ & 
(ii) Bg àíZ-nÌ _| Hw$b 30 àíZ h¢ & àíZ 1 go 8 VH$ Ho$ àíZ A{V-bKwCÎmar` àíZ h¢ Am¡a 
àË`oH$ EH$ A§H$ H$m h¡ & 
(iii) àíZ 9 go 18 _| àË`oH$ àíZ Xmo A§H$ H$m h¡, àíZ 19 go 27 _| àË`oH$ àíZ VrZ A§H$ H$m 
h¡ Am¡a àíZ 28 go 30 _| àË`oH$ àíZ nm±M A§H$ H$m h¡ & 
(iv) VrZ A§H$m| dmbo àíZm| _| go EH$ _yë`naH$ àíZ h¡ & 
(v) àíZ-nÌ _| g_J« na H$moB© {dH$ën Zht h¡ & VWm{n, Xmo A§H$m| dmbo EH$ àíZ _|, VrZ A§H$m| 
dmbo EH$ àíZ _| Am¡a nm±M A§H$m| dmbo VrZm| àíZm| _| AmÝV[aH$ M`Z àXmZ {H$`m J`m h¡ & 
Eogo àíZm| _| AmnH$mo {XE JE M`Z _| go Ho$db EH$ àíZ hr H$aZm h¡ & 
(vi) H¡$bHw$boQ>a Ho$ Cn`moJ H$s AZw_{V Zht h¡ & VWm{n `{X Amdí`H$ hmo Vmo Amn bKwJUH$s` 
gmaUr H$m à`moJ H$a gH$Vo h¢ & 
(vii) Ohm± Amdí`H$ hmo Amn {ZåZ{b{IV ^m¡{VH$ {Z`Vm§H$m| Ho$ _mZm| H$m Cn`moJ H$a gH$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
55/3 3 P.T.O. 
(vii) You  may use the following values of physical constants wherever necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. {X`m hþAm J«m\$ (AmboI), Xmo g§Ym[aÌm| C
1
 VWm C
2
 Ho$ {bE, {d^dmÝVa ‘V’ Ho$ gmW
Amdoe ‘q’ Ho$ n[adV©Z H$mo Xem©Vm h¡ & XmoZm| g§Ym[aÌm| _| n{Å>H$mAm| Ho$ ~rM n¥WH$Z (Xÿar)
g_mZ (~am~a) h¡, {H$ÝVw C
2
 _| n{Å>H$mAm| H$m joÌ\$b C
1
 H$s VwbZm _§o A{YH$ h¡ & J«m\$ _|
H$m¡Z-gr aoIm (A `m B) C
1
 Ho$ g§JV h¡ ? AnZo CÎma Ho$ {bE H$maU {b{IE & 1 
The given graph shows variation of charge ‘q’ versus potential difference 
‘V’ for two capacitors C
1
 and C
2
. Both the capacitors have same plate 
separation but plate area of C
2
 is greater than that of C
1
. Which line (A 
or B) corresponds to C
1
 and why ? 
2. g§Mma ì`dñWm _| ‘{d_mSw>bZ’ nX H$m Š`m A{^àm` hmoVm h¡ ? 1 
What does the term ‘demodulation’ in communication system mean ?
3. AdVb Xn©U na EH$ g_Vb Va§J Amn{VV hmoVr h¡ & namdV©Z Ho$ níMmV² ~mha AmVo hþE
Va§JmJ« Ho$ AmH$ma H$mo Xem©BE & 1 
Draw the shape of the wavefront coming out of a concave mirror when a
plane wave is incident on it.
55/3 4 
4. `{X EH$ Mwå~H$ H$mo AmaoI _| Xem©E JE AZwgma, g§Ym[aÌ H$s Amoa bo OmE±, Vmo ßboQ
(n{Å>H$m)> A H$s Yw«dVm Š`m hmoJr ? 1 
Predict the polarity of the plate A of the capacitor, when a magnet is 
moved towards it, as is shown in the figure. 
5. {H$gr MmbH$ H$s bå~mB© ‘l’ h¡ & BgHo$ Xmo {gam| Ho$ ~rM ‘V’ {d^dmÝVa h¡ & Bg MmbH$ _|
Amdoe dmhH$m| Ho$ Andmh doJ Ho$ {bE EH$ ì`§OH$ {b{IE & 1 
Write the expression for the drift velocity of charge carriers in a
conductor of length ‘l’ across which a potential difference ‘V’ is applied.
6. Cg eV© (à{V~§Y) H$m C„oI H$s{OE {OgHo$ AÝVJ©V, H«$m°{gV {dÚwV² Am¡a Mwå~H$s` joÌm|
H$s CnpñW{V _|, H$moB© BboŠQ´>m°Z A{djo{nV J{V H$aVm ahoJm & 1 
Write the condition under which an electron will move undeflected in the
presence of crossed electric and magnetic fields.
7. g§Mma H$s ‘{~ÝXþ-go-{~ÝXþ VH$’ VWm ‘àgmaU’ {d{Y`m| _§o A§Va (^oX) {b{IE & 1 
Distinguish between ‘point-to-point’ and ‘broadcast’ modes of
communication.
8. Vmn-d¥{Õ Ho$ gmW {H$gr YmVw H$s à{VamoYH$Vm _| d¥{Õ H$s ì`m»`m H¡$go H$s OmVr h¡ ? 1 
How does one explain increase in resistivity of a metal with increase of
temperature ?
9. (i) {H$gr I Ymamdmhr Aënm§e 
?
l d go 
?
r Xÿar na, Mwå~H$s` joÌ Ho$ {bE ~m`mo – gmdQ>© 
{Z`_ H$mo g{Xe ê$n _| {b{IE & 
(ii) EH$ d¥ÎmmH$ma nme (byn) Ho$ Ho$ÝÐ na Mwå~H$s` joÌ Ho$ n[a_mU (_mZ) Ho$ {bE 
ì`§OH$ {b{IE, `{X nme (byn) H$s {ÌÁ`m r h¡ Am¡a Bggo EH$ AMa (pñWa) Ymam 
I àdm{hV hmo ahr h¡ & Bg Ymam-nme Ho$ H$maU CËnÞ joÌ aoImAm| H$mo Xem©BE & 2
55/3 5 P.T.O. 
(i) State Biot – Savart law in vector form expressing the magnetic 
field due to an element 
?
l d carrying current I at a distance 
?
r from 
the element. 
(ii) Write the expression for the magnitude of the magnetic field at the 
centre of a circular loop of radius r carrying a steady current I. 
Draw the field lines due to the current loop. 
10. (a) {dÚwV²-Mwå~H$ {H$gr ñWm`r Mwå~H$ go {H$g àH$ma {^Þ hmoVm h¡ ? 
(b) {dÚwV²-Mwå~H$ ~ZmZo Ho$ {bE Cn`wº$ nXmW© Ho$ Xmo JwUY_© {b{IE & 2
(a) How is an electromagnet different from a permanent magnet ? 
(b) Write two properties of a material which make it suitable for 
making electromagnets. 
11. Xmo {~ÝXþ Amdoe q VWm – 2q EH$-Xÿgao go ‘d’ Xÿar na pñWV h¡§ & Amdoe ‘q’ Ho$ gmnoj, EH$
Eogo {~ÝXþ H$s AdpñW{V kmV H$s{OE, Ohm± na Amdoem| Ho$ Bg {ZH$m` Ho$ H$maU {d^d eyÝ`
hmo & 2 
AWdm 
EH$ {dÚwV² {ÛY«wd H$mo {H$gr EH$g_mZ {dÚwV²-joÌ 
?
E _| Eogo aIm J`m h¡ {H$ {ÛY«wd H$m 
{ÛY«wd AmKyU© 
?
p {dÚwV²-joÌ Ho$ g_mÝVa h¡ & kmV H$s{OE
(i) {ÛY«wd H$mo BVZm Kw_mZo _| {H$`m J`m H$m`© {Oggo CgHo$ {ÛY«wd AmKyU© H$s {Xem 
?
E
H$s {Xem Ho$ {dnarV hmo OmE & 
(ii) {ÛY«wd H$m dh A{^{dÝ`mg (pñW{V) {OgHo$ {bE Cg na bJZo dmbm ~b-AmKyU© 
(Q>m°H©$) A{YH$V_ hmo OmE & 2 
Two point charges q and – 2q are kept ‘d’ distance apart. Find the location 
of the point relative to charge ‘q’ at which potential due to this system of 
charges is zero.  
OR 
An electric dipole is placed in a uniform electric field 
?
E with its dipole 
moment 
?
p parallel to the field. Find 
(i) the work done in turning the dipole till its dipole moment points in 
the direction opposite to 
?
E . 
(ii) the orientation of the dipole for which the torque acting on it 
becomes maximum.  
Read More
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