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

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

 Page 1


55/1 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 
H$moS> Z§.      
55/1
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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> 15 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 15 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 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 
H$moS> Z§.      
55/1
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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> 15 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 15 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 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.  
Page 3


55/1 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 
H$moS> Z§.      
55/1
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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> 15 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 15 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 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$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
 = 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
55/1 3 P.T.O. 
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
(vii) You  may use the following values of physical constants wherever 
necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
 = 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. AZÝV bå~mB© Ho$ Xmo Ymamdmhr g_mÝVa MmbH$m| Ho$ ~rM ~b H$s g§H$ënZm H$m Cn`moJ H$aVo
hþE EH$ Eopån`a Ymam H$s n[a^mfm Xr{OE & 1 
Using the concept of force between two infinitely long parallel current
carrying conductors, define one ampere of current.
2. 5 ? 10
19
 Hz Amd¥{Îm H$s Va§J {dÚwV²-Mwå~H$s` ñnoŠQ´>_ Ho$ {H$g ^mJ go g§~§Y aIVr h¡ ? 1 
To which part of the electromagnetic spectrum does a wave of frequency
5 ? 10
19
 Hz belong ?
3. Xmo g_mZ J§oX| {OZ na ‘q’ Hy$bm°_ Ho$ g_mZ YZmdoe h¢ g_mZ bå~mB© H$s Xmo {dÚwV²amoYr
S>mo[a`m| go {Zb§{~V h¢ & BZHo$ ~rM bJZo dmbo ~b na Š`m à^md hmoJm O~ BZ XmoZm| J§oXm| Ho$
~rM H$moB© ßbmpñQ>H$ H$s MmXa aI Xr OmE ? 1 
Two equal balls having equal positive charge ‘q’ coulombs are suspended
by two insulating strings of equal length. What would be the effect on the
force when a plastic sheet is inserted between the two ?
Page 4


55/1 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 
H$moS> Z§.      
55/1
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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> 15 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 15 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 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$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
 = 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
55/1 3 P.T.O. 
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
(vii) You  may use the following values of physical constants wherever 
necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
 = 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. AZÝV bå~mB© Ho$ Xmo Ymamdmhr g_mÝVa MmbH$m| Ho$ ~rM ~b H$s g§H$ënZm H$m Cn`moJ H$aVo
hþE EH$ Eopån`a Ymam H$s n[a^mfm Xr{OE & 1 
Using the concept of force between two infinitely long parallel current
carrying conductors, define one ampere of current.
2. 5 ? 10
19
 Hz Amd¥{Îm H$s Va§J {dÚwV²-Mwå~H$s` ñnoŠQ´>_ Ho$ {H$g ^mJ go g§~§Y aIVr h¡ ? 1 
To which part of the electromagnetic spectrum does a wave of frequency
5 ? 10
19
 Hz belong ?
3. Xmo g_mZ J§oX| {OZ na ‘q’ Hy$bm°_ Ho$ g_mZ YZmdoe h¢ g_mZ bå~mB© H$s Xmo {dÚwV²amoYr
S>mo[a`m| go {Zb§{~V h¢ & BZHo$ ~rM bJZo dmbo ~b na Š`m à^md hmoJm O~ BZ XmoZm| J§oXm| Ho$
~rM H$moB© ßbmpñQ>H$ H$s MmXa aI Xr OmE ? 1 
Two equal balls having equal positive charge ‘q’ coulombs are suspended
by two insulating strings of equal length. What would be the effect on the
force when a plastic sheet is inserted between the two ?
55/1 4 
4. àH$me Ho$ µ\$moQ>m°Z {MÌU Ho$ AmYma na {d{H$aU H$s Vrd«Vm H$mo n[a^m{fV H$s{OE & BgH$m
Eg.AmB©. (S.I.) _mÌH$ {b{IE & 1 
Define intensity of radiation on the basis of photon picture of light. Write
its S.I. unit.
5. {H$gr Vma _| B go A {Xem H$s Amoa àdm{hV {dÚwV² Ymam KQ> ahr h¡ & {MÌ _| Xem©E AZwgma
Bg Vma Ho$ D$na pñWV {H$gr YmVw Ho$ byn (nme) _| ào[aV Ymam H$s {Xem kmV H$s{OE & 1 
The electric current flowing in a wire in the direction from B to A is 
decreasing. Find out the direction of the induced current in the metallic 
loop kept above the wire as shown.  
6. Zm{^H$s` ?-j` _| Ý`y{Q´>Zm| H$m g§gyMZ àm`mo{JH$ ê$n _| H${R>Z Š`m| nm`m OmVm h¡ ? 1 
Why is it found experimentally difficult to detect neutrinos in nuclear
?-decay ?
7. d.c. dmoëQ>Vm H$s VwbZm _| a.c. dmoëQ>Vm Ho$ Cn`moJ H$mo àmW{_H$Vm Š`m| Xr OmVr h¡ ? Xmo 
H$maU Xr{OE & 1 
Why is the use of a.c. voltage preferred over d.c. voltage ? Give two 
reasons. 
8. 1
.
25 AndV©Zm§H$ Ho$ nmaXeu nXmW© go ~Zo {H$gr C^`moÎmb b|g H$mo 1
.
33 AndV©Zm§H$ Ho$
Ob _| Sw>~mo`m J`m h¡ & Š`m `h b|g A{^gmar Ho$ ê$n _§o ì`dhma H$aoJm AWdm Angmar Ho$
ê$n _| ? H$maU Xr{OE & 1 
A biconvex lens made of a transparent material of refractive index 1
.
25
is immersed in water of refractive index 1
.
33. Will the lens behave as a
converging or a diverging lens ? Give reason.
Page 5


55/1 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 
H$moS> Z§.      
55/1
Code No.
amob Z§. 
Roll No.
^m¡{VH$ {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> 15 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 15 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 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$Vo h¢ : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
 = 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
General Instructions : 
(i) All questions are compulsory. 
(ii) There are 30 questions in total. Questions No. 1 to 8 are very short answer 
type questions and carry one mark each. 
(iii) Questions No. 9 to 18 carry two marks each, questions 19 to 27 carry 
three marks each and questions 28 to 30 carry five marks each. 
(iv) One of the questions carrying three marks weightage is value based 
question.  
55/1 3 P.T.O. 
(v) There is no overall choice. However, an internal choice has been provided 
in one question of two marks, one question of three marks and all three 
questions of five marks each weightage. You have to attempt only one of 
the choices in such questions. 
(vi) Use of calculators is not permitted. However, you may use log tables if 
necessary. 
(vii) You  may use the following values of physical constants wherever 
necessary : 
c = 3 ? 10
8
 m/s
h = 6
.
63 ? 10
–34
 Js
e = 1
.
6 ? 10
–19
 C
?
o
 = 4 ? ? 10
–7
 T mA
–1
o
4
1
? ?
= 9 ? 10
9
 N m
2
 C
–2
m
e
 = 9
.
1 ? 10
–31
 kg
1. AZÝV bå~mB© Ho$ Xmo Ymamdmhr g_mÝVa MmbH$m| Ho$ ~rM ~b H$s g§H$ënZm H$m Cn`moJ H$aVo
hþE EH$ Eopån`a Ymam H$s n[a^mfm Xr{OE & 1 
Using the concept of force between two infinitely long parallel current
carrying conductors, define one ampere of current.
2. 5 ? 10
19
 Hz Amd¥{Îm H$s Va§J {dÚwV²-Mwå~H$s` ñnoŠQ´>_ Ho$ {H$g ^mJ go g§~§Y aIVr h¡ ? 1 
To which part of the electromagnetic spectrum does a wave of frequency
5 ? 10
19
 Hz belong ?
3. Xmo g_mZ J§oX| {OZ na ‘q’ Hy$bm°_ Ho$ g_mZ YZmdoe h¢ g_mZ bå~mB© H$s Xmo {dÚwV²amoYr
S>mo[a`m| go {Zb§{~V h¢ & BZHo$ ~rM bJZo dmbo ~b na Š`m à^md hmoJm O~ BZ XmoZm| J§oXm| Ho$
~rM H$moB© ßbmpñQ>H$ H$s MmXa aI Xr OmE ? 1 
Two equal balls having equal positive charge ‘q’ coulombs are suspended
by two insulating strings of equal length. What would be the effect on the
force when a plastic sheet is inserted between the two ?
55/1 4 
4. àH$me Ho$ µ\$moQ>m°Z {MÌU Ho$ AmYma na {d{H$aU H$s Vrd«Vm H$mo n[a^m{fV H$s{OE & BgH$m
Eg.AmB©. (S.I.) _mÌH$ {b{IE & 1 
Define intensity of radiation on the basis of photon picture of light. Write
its S.I. unit.
5. {H$gr Vma _| B go A {Xem H$s Amoa àdm{hV {dÚwV² Ymam KQ> ahr h¡ & {MÌ _| Xem©E AZwgma
Bg Vma Ho$ D$na pñWV {H$gr YmVw Ho$ byn (nme) _| ào[aV Ymam H$s {Xem kmV H$s{OE & 1 
The electric current flowing in a wire in the direction from B to A is 
decreasing. Find out the direction of the induced current in the metallic 
loop kept above the wire as shown.  
6. Zm{^H$s` ?-j` _| Ý`y{Q´>Zm| H$m g§gyMZ àm`mo{JH$ ê$n _| H${R>Z Š`m| nm`m OmVm h¡ ? 1 
Why is it found experimentally difficult to detect neutrinos in nuclear
?-decay ?
7. d.c. dmoëQ>Vm H$s VwbZm _| a.c. dmoëQ>Vm Ho$ Cn`moJ H$mo àmW{_H$Vm Š`m| Xr OmVr h¡ ? Xmo 
H$maU Xr{OE & 1 
Why is the use of a.c. voltage preferred over d.c. voltage ? Give two 
reasons. 
8. 1
.
25 AndV©Zm§H$ Ho$ nmaXeu nXmW© go ~Zo {H$gr C^`moÎmb b|g H$mo 1
.
33 AndV©Zm§H$ Ho$
Ob _| Sw>~mo`m J`m h¡ & Š`m `h b|g A{^gmar Ho$ ê$n _§o ì`dhma H$aoJm AWdm Angmar Ho$
ê$n _| ? H$maU Xr{OE & 1 
A biconvex lens made of a transparent material of refractive index 1
.
25
is immersed in water of refractive index 1
.
33. Will the lens behave as a
converging or a diverging lens ? Give reason.
55/1 5 P.T.O. 
9. na_mUw Ho$ aXa\$moS>© _m°S>b H$m Cn`moJ H$aVo hþE hmBS´>moOZ na_mUw _| BboŠQ´>m°Z H$s Hw$b D$Om©
Ho$ {bE ì`§OH$ ì`wËnÞ H$s{OE & BboŠQ´>m°Z H$s Hw$b D$Om© G$UmË_H$ hmoZo H$m Š`m AW© h¡ ? 2 
AWdm 
~moa Ho$ na_mUw _m°S>b Ho$ A{^J¥hrVm| H$m Cn`moJ H$aHo$ BboŠQ´>m°Z H$s ndt H$jm H$s {ÌÁ`m Ho$ 
{bE ì`§OH$ ì`wËnÞ H$s{OE & Bg àH$ma ~moa H$s {ÌÁ`m Ho$ {bE ì`§OH$ àmßV H$s{OE & 2 
Using Rutherford model of the atom, derive the expression for the total 
energy of the electron in hydrogen atom. What is the significance of total 
negative energy possessed by the electron ?  
OR 
Using Bohr’s postulates of the atomic model, derive the expression for 
radius of n
th
 electron orbit. Hence obtain the expression for Bohr’s
radius. 
10. Ym[aVm C Ho$ {H$gr g_mÝVa n{Å>H$m g§Ym[aÌ H$mo {d^d V VH$ Amdo{eV {H$`m J`m & BgHo$
níMmV² Bgo g_mZ Ym[aVm Ho$ {H$gr AÝ` g§Ym[aÌ, Omo Amdo{eV Zht h¡, go g§`mo{OV {H$`m
OmVm h¡ & g§`wº$ {ZH$m` _| g§{MV D$Om© Am¡a Amaå^ _| EH$b g§Ym[aÌ _| g§{MV D$Om© H$m
AZwnmV kmV H$s{OE & 2 
A parallel plate capacitor of capacitance C is charged to a potential V. It
is then connected to another uncharged capacitor having the same
capacitance. Find out the ratio of the energy stored in the combined
system to that stored initially in the single capacitor.
11. {H$gr g_mÝVa n{Å>H$m g§Ym[aÌ Ho$ Amdo{eV hmoZo Ho$ àH$aU na {dMma H$aVo hþE `h Xem©BE
{H$ {dñWmnZ Ymam Ho$ H$maU nX H$mo gpå_{bV H$aZo Ho$ {bE Eopån`a Ho$ n[anWr` {Z`_ H$mo
{H$g àH$ma ì`mnH$ ~ZmZo H$s Amdí`H$Vm hmoVr h¡ & 2 
Considering the case of a parallel plate capacitor being charged, show
how one is required to generalize Ampere’s circuital law to include the
term due to displacement current.
Read More
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