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

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

 Page 1


55/1/1 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/1/C 
H$moS> Z§.      
55/1/1 
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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


55/1/1 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/1/C 
H$moS> Z§.      
55/1/1 
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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.
55/1/1 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


55/1/1 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/1/C 
H$moS> Z§.      
55/1/1 
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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.
55/1/1 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$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
55/1/1 3 P.T.O. 
(vii) You  may use the following values of physical constants wherever necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. AmaoI _| Xem©E JE AZwgma Xmo {~ÝXþ Amdoe ?q
1
? VWm ?q
2
? EH$-Xÿgao go ?d? Xÿar na pñWV
h¢ & BZH$mo Omo‹S>Zo dmbr gab aoIm na pñWV EH$ {~ÝXþ ?P? na {dÚwV²-joÌ H$s Vrd«Vm eyÝ`
h¡ & Bggo Amn Omo Xmo {ZîH$f© {ZH$mb gH$Vo h¢, CZH$m C„oI H$s{OE & 1 
Two point charges ?q
1
? and ?q
2
? are placed at a distance ?d? apart as shown
in the figure. The electric field intensity is zero at a point ?P? on the line 
joining them as shown. Write two conclusions that you can draw from 
this. 
2. {H$gr MmbH$ Ho$ {gam| na EH$ {d^dmÝVa AZwà`wº$ {H$`m (bJm`m) OmE, Vmo Cg_| _wº$
BboŠQ´>m°Zm| H$s `mÑpÀN>H$ J{V na Š`m à^md n‹S>Vm h¡ ? 1 
How does the random motion of free electrons in a conductor get affected
when a potential difference is applied across its ends ?
3. {H$gr nXmW© H$s Amno{jH$ nmaJå`Vm (Mwå~H$erbVm) ?
r
 = 0
.
5 h¡ & Bg Mwå~H$s` nXmW©
H$s àH¥${V H$s nhMmZ H$s{OE Am¡a BgH$m Mwå~H$s` àd¥{Îm go g§~§Y {b{IE & 1 
Relative permeability of a material, ?
r
 = 0
.
5. Identify the nature of the
magnetic material and write its relation to magnetic susceptibility.
4. Cƒ Amd¥{Îm H$s àË`mdVu Ymamdmhr {H$gr Hw§$S>br go {Kam hþAm YmVw H$m Qw>H$‹S>m J_© Š`m| hmo
OmVm h¡ ? 1 
A metallic piece gets hot when surrounded by a coil carrying high
frequency alternating current. Why ?
5. {H$gr aoIr` E|Q>rZm go {d{H$[aV à^mdr e{º$, ào{fV {H$E JE g§Ho$Vm| ({g½Zbm|) H$s
Va§JX¡¿`© na {H$g àH$ma {Z^©a H$aVr h¡ ? 1 
How does the effective power radiated from a linear antenna depend on
the wavelength of the signal to be transmitted ?
6. ì`mnH$sH¥$V g§Mma ì`dñWm H$m EH$ ãbm°H$ AmaoI ~ZmBE & 1 
Draw a block diagram of a generalized communication system.
Page 4


55/1/1 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/1/C 
H$moS> Z§.      
55/1/1 
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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.
55/1/1 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$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
55/1/1 3 P.T.O. 
(vii) You  may use the following values of physical constants wherever necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. AmaoI _| Xem©E JE AZwgma Xmo {~ÝXþ Amdoe ?q
1
? VWm ?q
2
? EH$-Xÿgao go ?d? Xÿar na pñWV
h¢ & BZH$mo Omo‹S>Zo dmbr gab aoIm na pñWV EH$ {~ÝXþ ?P? na {dÚwV²-joÌ H$s Vrd«Vm eyÝ`
h¡ & Bggo Amn Omo Xmo {ZîH$f© {ZH$mb gH$Vo h¢, CZH$m C„oI H$s{OE & 1 
Two point charges ?q
1
? and ?q
2
? are placed at a distance ?d? apart as shown
in the figure. The electric field intensity is zero at a point ?P? on the line 
joining them as shown. Write two conclusions that you can draw from 
this. 
2. {H$gr MmbH$ Ho$ {gam| na EH$ {d^dmÝVa AZwà`wº$ {H$`m (bJm`m) OmE, Vmo Cg_| _wº$
BboŠQ´>m°Zm| H$s `mÑpÀN>H$ J{V na Š`m à^md n‹S>Vm h¡ ? 1 
How does the random motion of free electrons in a conductor get affected
when a potential difference is applied across its ends ?
3. {H$gr nXmW© H$s Amno{jH$ nmaJå`Vm (Mwå~H$erbVm) ?
r
 = 0
.
5 h¡ & Bg Mwå~H$s` nXmW©
H$s àH¥${V H$s nhMmZ H$s{OE Am¡a BgH$m Mwå~H$s` àd¥{Îm go g§~§Y {b{IE & 1 
Relative permeability of a material, ?
r
 = 0
.
5. Identify the nature of the
magnetic material and write its relation to magnetic susceptibility.
4. Cƒ Amd¥{Îm H$s àË`mdVu Ymamdmhr {H$gr Hw§$S>br go {Kam hþAm YmVw H$m Qw>H$‹S>m J_© Š`m| hmo
OmVm h¡ ? 1 
A metallic piece gets hot when surrounded by a coil carrying high
frequency alternating current. Why ?
5. {H$gr aoIr` E|Q>rZm go {d{H$[aV à^mdr e{º$, ào{fV {H$E JE g§Ho$Vm| ({g½Zbm|) H$s
Va§JX¡¿`© na {H$g àH$ma {Z^©a H$aVr h¡ ? 1 
How does the effective power radiated from a linear antenna depend on
the wavelength of the signal to be transmitted ?
6. ì`mnH$sH¥$V g§Mma ì`dñWm H$m EH$ ãbm°H$ AmaoI ~ZmBE & 1 
Draw a block diagram of a generalized communication system.
55/1/1 4 
7. `§J Ho$ {Û{Par à`moJ _| ì`{VH$aU n¡Q>Z© CËnÞ H$aZo Ho$ {bE Amdí`H$ ?H$bm-g§~Õ òmoVm|?
H$mo n[a^m{fV H$s{OE & 1 
Define the term ?coherent sources? which are required to produce
interference pattern in Young?s double slit experiment.
8. {d^d_mnr (nmoQ>opÝe`mo_rQ>a) {H$g {gÕmÝV na AmYm[aV h¡ ? C„oI H$s{OE & 1 
State the underlying principle of a potentiometer.
9. YmVw Ho$ EH$ N>moQ>o Jmobo na +Q Amdoe h¡ & Bgo {H$gr ~‹S>o, YmVw Ho$ JmobmH$ma H$moe (e¡b)
H$s, Jmobr` H$moQ>a (H¡${dQ>r) Ho$ Ho$ÝÐ na aIm J`m h¡ & JmobmH$ma H$moe na H$moB© Amdoe Zht
h¡ &  JmobmH$ma H$moe H$s ~mø (~mhar) VWm ^rVar n¥ð>m| na Amdoe Ho$ ~mao _| {b{IE &
{~ÝXþ P
1
 na {dÚwV²-joÌ Ho$ {bE ì`§OH$ {b{IE & 2
A small metal sphere carrying charge +Q is located at the centre of a 
spherical cavity in a large uncharged metallic spherical shell. Write the 
charges on the inner and outer surfaces of the shell. Write the expression 
for the electric field at the point P
1
.
10. EH$ bå~r n[aZm{bH$m go àdm{hV {dÚwV² Ymam Ho$ H$maU CËnÞ, Mwå~H$s` joÌ aoImAm| H$mo
Xem©BE & `{X Bg_| I Ymam àdm{hV hmo ahr hmo Am¡a BgH$s à{V BH$mB© bå~mB© _| \o$am| H$s
g§»`m n hmo, Vmo Eopån`a Ho$ n[anWr` {Z`_ Ho$ Cn`moJ Ûmam, Bg Ymam Ho$ H$maU Mwå~H$s`
joÌ Ho$ {bE EH$ ì`§OH$ àmá H$s{OE & 2
Draw the magnetic field lines due to a current passing through a long
solenoid. Use Ampere?s circuital law, to obtain the expression for the
magnetic field due to the current I in a long solenoid having n number of
turns per unit length.
Page 5


55/1/1 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/1/C 
H$moS> Z§.      
55/1/1 
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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.
55/1/1 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$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
55/1/1 3 P.T.O. 
(vii) You  may use the following values of physical constants wherever necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
= 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. AmaoI _| Xem©E JE AZwgma Xmo {~ÝXþ Amdoe ?q
1
? VWm ?q
2
? EH$-Xÿgao go ?d? Xÿar na pñWV
h¢ & BZH$mo Omo‹S>Zo dmbr gab aoIm na pñWV EH$ {~ÝXþ ?P? na {dÚwV²-joÌ H$s Vrd«Vm eyÝ`
h¡ & Bggo Amn Omo Xmo {ZîH$f© {ZH$mb gH$Vo h¢, CZH$m C„oI H$s{OE & 1 
Two point charges ?q
1
? and ?q
2
? are placed at a distance ?d? apart as shown
in the figure. The electric field intensity is zero at a point ?P? on the line 
joining them as shown. Write two conclusions that you can draw from 
this. 
2. {H$gr MmbH$ Ho$ {gam| na EH$ {d^dmÝVa AZwà`wº$ {H$`m (bJm`m) OmE, Vmo Cg_| _wº$
BboŠQ´>m°Zm| H$s `mÑpÀN>H$ J{V na Š`m à^md n‹S>Vm h¡ ? 1 
How does the random motion of free electrons in a conductor get affected
when a potential difference is applied across its ends ?
3. {H$gr nXmW© H$s Amno{jH$ nmaJå`Vm (Mwå~H$erbVm) ?
r
 = 0
.
5 h¡ & Bg Mwå~H$s` nXmW©
H$s àH¥${V H$s nhMmZ H$s{OE Am¡a BgH$m Mwå~H$s` àd¥{Îm go g§~§Y {b{IE & 1 
Relative permeability of a material, ?
r
 = 0
.
5. Identify the nature of the
magnetic material and write its relation to magnetic susceptibility.
4. Cƒ Amd¥{Îm H$s àË`mdVu Ymamdmhr {H$gr Hw§$S>br go {Kam hþAm YmVw H$m Qw>H$‹S>m J_© Š`m| hmo
OmVm h¡ ? 1 
A metallic piece gets hot when surrounded by a coil carrying high
frequency alternating current. Why ?
5. {H$gr aoIr` E|Q>rZm go {d{H$[aV à^mdr e{º$, ào{fV {H$E JE g§Ho$Vm| ({g½Zbm|) H$s
Va§JX¡¿`© na {H$g àH$ma {Z^©a H$aVr h¡ ? 1 
How does the effective power radiated from a linear antenna depend on
the wavelength of the signal to be transmitted ?
6. ì`mnH$sH¥$V g§Mma ì`dñWm H$m EH$ ãbm°H$ AmaoI ~ZmBE & 1 
Draw a block diagram of a generalized communication system.
55/1/1 4 
7. `§J Ho$ {Û{Par à`moJ _| ì`{VH$aU n¡Q>Z© CËnÞ H$aZo Ho$ {bE Amdí`H$ ?H$bm-g§~Õ òmoVm|?
H$mo n[a^m{fV H$s{OE & 1 
Define the term ?coherent sources? which are required to produce
interference pattern in Young?s double slit experiment.
8. {d^d_mnr (nmoQ>opÝe`mo_rQ>a) {H$g {gÕmÝV na AmYm[aV h¡ ? C„oI H$s{OE & 1 
State the underlying principle of a potentiometer.
9. YmVw Ho$ EH$ N>moQ>o Jmobo na +Q Amdoe h¡ & Bgo {H$gr ~‹S>o, YmVw Ho$ JmobmH$ma H$moe (e¡b)
H$s, Jmobr` H$moQ>a (H¡${dQ>r) Ho$ Ho$ÝÐ na aIm J`m h¡ & JmobmH$ma H$moe na H$moB© Amdoe Zht
h¡ &  JmobmH$ma H$moe H$s ~mø (~mhar) VWm ^rVar n¥ð>m| na Amdoe Ho$ ~mao _| {b{IE &
{~ÝXþ P
1
 na {dÚwV²-joÌ Ho$ {bE ì`§OH$ {b{IE & 2
A small metal sphere carrying charge +Q is located at the centre of a 
spherical cavity in a large uncharged metallic spherical shell. Write the 
charges on the inner and outer surfaces of the shell. Write the expression 
for the electric field at the point P
1
.
10. EH$ bå~r n[aZm{bH$m go àdm{hV {dÚwV² Ymam Ho$ H$maU CËnÞ, Mwå~H$s` joÌ aoImAm| H$mo
Xem©BE & `{X Bg_| I Ymam àdm{hV hmo ahr hmo Am¡a BgH$s à{V BH$mB© bå~mB© _| \o$am| H$s
g§»`m n hmo, Vmo Eopån`a Ho$ n[anWr` {Z`_ Ho$ Cn`moJ Ûmam, Bg Ymam Ho$ H$maU Mwå~H$s`
joÌ Ho$ {bE EH$ ì`§OH$ àmá H$s{OE & 2
Draw the magnetic field lines due to a current passing through a long
solenoid. Use Ampere?s circuital law, to obtain the expression for the
magnetic field due to the current I in a long solenoid having n number of
turns per unit length.
55/1/1 5 P.T.O. 
11. {H$gr àH$me-g§doXr n¥ð> na EŠg-{H$aUm| Ho$ AmnVZ go àH$me-{dÚwV² CËgO©Z hmo ahm h¡ &
Bg n¥ð> Ho$ H$m`©-\$bZ H$mo ZJÊ` _mZVo hþE, Amn{VV \$moQ>m°Zm| H$s D$Om© (E
v
) VWm CËg{O©V
BboŠQ´>m°Zm| H$s Xo-~«m°½br Va§JX¡¿`© ( ?) Ho$ ~rM g§~§Y kmV H$s{OE &  E
v
 Ho$ \$bZ Ho$ ê$n _|
? Ho$ {bE J«m\$ (AmboI) H$s àH¥${V H$mo Xem©BE & 2
X-rays fall on a photosensitive surface to cause photoelectric emission. 
Assuming that the work function of the surface can be neglected, find the 
relation between the de-Broglie wavelength ( ?) of the electrons emitted to 
the energy (E
v
) of the incident photons. Draw the nature of the graph for
? as a function of E
v
.
12. namdVu XÿaXe©H$ (H¡$goJ«oZ) H$m EH$ ì`dñWm AmaoI ~ZmBE & AndVu XÿaXe©H$ H$s VwbZm _|
BgHo$ Xmo JwU (bm^) {b{IE & 2
Draw a schematic diagram of a reflecting telescope (Cassegrain). Write
its two advantages over a refracting telescope.
13. Xmo NOT JoQ>m| Ho$ {ZJ©Vm| H$mo NOR JoQ> _| nwZ… {Z{d©ï>> {H$`m OmVm h¡ & BZ Xmo JoQ>m| Ho$
g§`moOZ H$m VH©$ n[anW ~ZmBE & Bg g§`moOZ Ûmam {Zê${nV JoQ> H$mo nhMmZ H$a CgH$m Zm_
{b{IE VWm BgHo$ {bE gË`_mZ gmaUr ~ZmBE & 2
The outputs of two NOT gates are fed to a NOR gate. Draw the logic
circuit of the combination of gates. Give its truth table. Identify the gate
represented by this combination.
14. EH$ Am`VmH$ma Hw$ÊS>br, {OgH$s bå~mB© ?l ’ VWm Mm¡‹S>mB© ?b? h¡, go I Ymam àdm{hV hmo ahr
h¡ & BgH$mo EH$ EH$g_mZ Mwå~H$s` joÌ 
?
B _| aIm J`m h¡ & Mwå~H$s` joÌ H$s {Xem, 
Hw$ÊS>br Ho$ Vb Ho$ bå~dV² h¡ & Hw$ÊS>br na bJZo dmbo ~b-AmKyU© Ho$ {bE ì`§OH$ àmá 
H$s{OE & 2
A rectangular coil of sides ?l? and ?b? carrying a current I is subjected to a 
uniform magnetic field 
?
B acting perpendicular to its plane. Obtain the 
expression for the torque acting on it.  
15. Vmn _| d¥{Õ Ho$ gmW (i) {H$gr MmbH$ VWm (ii) {H$gr AY©MmbH$ H$s à{VamoYH$Vm _|
n[adV©Z H$mo Xem©Zo Ho$ {bE EH$ J«m\$ (AmboI) ~ZmBE &
BZHo$ Bg ì`dhma H$mo Amdoe dmhH$m| Ho$ g§»`m KZËd VWm {dlm§{V H$mb Ho$ nXm| _| H¡$go
ñnï> {H$`m OmVm h¡ ? 2 
Draw a plot showing the variation of resistivity of a (i) conductor and
(ii) semiconductor, with the increase in temperature.
How does one explain this behaviour in terms of number density of
charge carriers and the relaxation time ?
Read More
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