CLASS : 12th (Sr. Secondary) Code No.

5628
Series : SS-April/2021
Roll No. SET : A
HkkSfrd foKku
PHYSICS
Hkkx – I
PART – I
¼vkRefu"B iz'u½
(Subjective Questions)
ACADEMIC/OPEN
[ fgUnh ,oa vaxzsth ek/;e ]
[ Hindi and English Medium ]
(Only for Fresh/Re-appear Candidates)

le; : 2 21 ?k.Vs ] [ iw.kk±d : 70 ¼Hkkx–I : 35, Hkkx–II : 35½

Time allowed : 2 21 hours ] [ Maximum Marks : 70 (Part–I : 35, Part–II : 35)

iz'u&i= nks Hkkxkas eas foHkkftr gS % Hkkx–I ¼vkRefu"B½ ,oa Hkkx–II ¼oLrqfu"B½A ijh{kkFkhZ dks nksuksa Hkkxkas ds iz'ukas
ds mÙkj dks viuh mÙkj iqfLrdk eas fy[kuk gSA iz'u&i= dk Hkkx–I ijh{kk vkjEHk gksus ij igys mÙkj&iqfLrdk
ds lkFk fn;k tk,xk rFkk Hkkx–II ds fy, vkf[kjh dk ,d ?kaVs dk le; fn;k tk,xk vFkkZr~ ijh{kk lekIr
gksus ls ,d ?kaVk iwoZ ijh{kkFkhZ dks Hkkx–II dk iz'u-i= fn;k tk,xkA
Hkkx–I ds iz'u&i= esa dqy 12 iz'u ,oa Hkkx–II ds iz'u&i= eas dqy 35 iz'u gSaA
Question paper is divided into two Parts : Part–I (Subjective type) and Part–II
(Objective type). Answer the questions of both parts in your answer-book. Part–I
of question paper with answer-book will be provided with starting of
Examination and last one hour of Examination will be given for Part–II i.e.
question paper of Part–II will be provided before one hour of the end of
Examination.
Total questions in question paper of Part–I are 12 and of Part–II are 35.

• Ñi;k tk¡p dj ysa fd Hkkx–I ds bl iz'u-i= esa eqfnzr i`"B 4 rFkk iz'u 12 gSaA
Please make sure that the printed pages in this question paper of Part–I are 4 in
number and it contains 12 questions.

5628/(Set : A)/ I P. T. O.
 (2) 5628/(Set : A)
• iz'u-i= esa nkfgus gkFk dh vksj fn;s x;s dksM uEcj rFkk lsV dks Nk= mÙkj-iqfLrdk ds eq[;-i`"B ij fy[ksaA
The Code No. and Set on the right side of the question paper should be written by
the candidate on the front page of the answer-book.
• Ñi;k iz'u dk mÙkj fy[kuk 'kq: djus ls igys] iz'u dk Øekad vo'; fy[ksaA
Before beginning to answer a question, its Serial Number must be written.
• mÙkj-iqfLrdk ds chp esa [kkyh iUuk / iUus u NksMsa+A
Don’t leave blank page/pages in your answer-book.
• mÙkj-iqfLrdk ds vfrfjDr dksbZ vU; 'khV ugha feysxhA vr% vko';drkuqlkj gh fy[ksa vkSj fy[kk mÙkj u
dkVsaA
Except answer-book, no extra sheet will be given. Write to the point and do not
strike the written answer.
• ijh{kkFkhZ viuk jksy ua0 iz'u&i= ij vo'; fy[ksaA
Candidates must write their Roll Number on the question paper.
• d`i;k iz'uksa dk mÙkj nsus lss iwoZ ;g lqfuf'pr dj ysa fd iz'u-i= iw.kZ o lgh gS] ijh{kk ds mijkUr bl
lEcU/k esa dksbZ Hkh nkok Lohdkj ugha fd;k tk;sxkA
Before answering the questions, ensure that you have been supplied the correct and
complete question paper, no claim in this regard, will be entertained after
examination.
lkekU; funsZ'k %
General Instructions :
(i) lHkh iz'u vfuok;Z gSaA
All questions are compulsory.
(ii) izR;sd iz'u ds vad mlds lkeus n'kkZ;s x, gSaA
Marks of each question are indicated against it.
(iii) ç'u la[;k 1 ls 5 rd vfry?kq mÙkjh; ç'u gSa rFkk çR;sd ç'u 2 vadksa dk gSA
Question Numbers 1 to 5 are very short answer type questions and carry 2
marks each.
(iv) ç'u la[;k 6 ls 10 rd y?kq mÙkjh; ç'u gSa rFkk çR;sd ç'u 3 vadksa dk gSA
Question Numbers 6 to 10 are short answer type questions and carry 3
marks each.
(v) ç'u la[;k 11 ,oa 12 nh?kZ mÙkjh; ç'u gSa rFkk çR;sd ç'u 5 vadksa dk gSA
Question Numbers 11 & 12 are long answer type questions and carry 5
marks each.
5628/(Set : A)/ I
 (3) 5628/(Set : A)
(vi) ç'u-i= esa lexz :i ls dksbZ fodYi ugha gSA rFkkfi 5 vadksa okys nksuksa ç'uksa esa vkUrfjd p;u çnku
fd;k x;k gSA ,sls ç'uksa esa ls vkidks fn, x, p;u esa ls dsoy ,d gh ç'u djuk gSA
There is no overall choice. However, an internal choice has been provided in
both questions of 5 marks. You have to attempt only one of the given choices
in such questions.
[k.M – v
SECTION – A
¼vfry?kq mÙkjh;
mÙkjh; ç'u½
(Very Short Answer Type Questions)
1. çdk'k-oS|qr~ çHkko D;k gS \ çdk'k-oS|qr~ çHkko esa çdk'k dh vko`fÙk rFkk fujks/kh foHko esa xzkQ cukb,A
2
What is photoelectric effect ? Draw a graph between the frequency of incident
light and stopping potential in photoelectric effect.
2. dksbZ VSad 15 lseh Å¡pkbZ rd ty ls Hkjk gSA fdlh lw{en'khZ }kjk chdj dh ryh ij iM+h fdlh lqbZ
dh vkHkklh xgjkbZ 10 lseh ekih tkrh gSA ty dk viorZukad D;k gS \ 2
A tank is filled with water to a height of 15 cm. The apparent depth of a needle
lying at the bottom of the tank is measured by a microscope to be 10 cm. What
is refractive index of water ?

3. fo|qr~ pqEcdh; rjaxksa ds dksbZ nks xq.k fy[ksaA 2

Write any two characteristics of Electromagnetic Waves.
4. ,d LCR ifjiFk] ftlesa L = 5.0 H, C = 80 µF rFkk R = 40 Ω, vuqukn vko`fÙk ω0 dk
ifjdyu dhft,A 2
Obtain the resonant frequency ω0 of a series LCR circuit with L = 5.0 H,
C = 80 µF and R = 40 Ω.
5. fdlh la/kkfj= dh /kkfjrk dh ifjHkk"kk fyf[k,A 2
Define capacitance of a Capacitor.

[k.M – c
SECTION – B
¼y?kq mÙkjh; ç'u½
(Short Answer Type Questions)
6. P-N lfU/k Mk;ksM dk mi;ksx djds iw.kZ rjax fn"Vdkjh ifjiFk dk fp= cukb,A fuos'kh rFkk fuxZr
oksYVrkvksa ds rjax :i fn[kkb,A 3
Draw a circuit diagram of a Full Wave Rectifier using a P-N junction diode.
Show waveforms of input and output voltages.
5628/(Set : A)/ I P. T. O.
 (4) 5628/(Set : A)
7. gkbMªkstu ijek.kq ds fy, cksg~j dh vfHk/kkj.kk,¡ fyf[k,A 3
Write Bohr's postulates for hydrogen atom.
8. oS|qr~ ifjiFk ds fy, OghVLVksu lsrq ds fu;e dk vko';d ifjiFk fp= nsrs gq, mYys[k dhft,A
3
State Wheatstone bridge principle for electrical circuits giving necessary circuit
diagram.
9. oS|qr~ LFkSfrdh esa xkml ds fu;e dks fyf[k, o fl) dhft,A 3
State and prove Gauss's Law in Electrostatics.
10. çR;korhZ /kkjk tfu= dk ukekafdr fp= cukb, rFkk bldk fl)kar fyf[k,A 3
Draw labelled diagram of A.C. generator and write its principle.
[k.M – l
SECTION – C
¼nh?k
nh?kZ?kZ mÙkjh; ç'u½
(Long Answer Type Questions)
11. rjaxkxz fdls dgrs gSa \ gkbxsUl ds fl)kUr dk mi;ksx djds viorZu ds fu;eksa dk lR;kiu dhft,A 5
What is Wavefront ? Using Huygen's principle to verify the Laws of Refraction.
vFkok
OR
fdlh [kxksyh; nwjchu esa çfrfcac cuus dk ukekafdr fdj.k vkjs[k cukdj le>kb,A bldh vko/kZu
{kerk ds fy, O;atd fudkfy,A
Draw a labelled ray diagram showing image formation in an astronomical
telescope. Derive expression for its magnifying power.
12. f=T;k R ds fdlh o`Ùkkdkj ik'k ls /kkjk I çokfgr gks jgh gSA bl ik'k ds dsUæ ls blds v{k ij fLFkr
X nwjh ds fdlh fcUnq ij pqEcdh; {ks= ds fy, O;atd çkIr dhft,A 5
A circular loop of radius R carries a current I. Obtain an expression for the
magnetic field at a point on its axis at a distance X from its centre.
vFkok
OR
nks yacs lh/ks lekarj pkydksa ds chp yxus okys cy ds fy, O;atd fudkfy, ftuesa fo|qr~ /kkjk ,d gh
fn'kk esa cg jgh gksA vr% ,d ,sfEi;j dks ifjHkkf"kr dhft,A
Derive an expression for the force between two long straight parallel
conductors carrying current in same direction. Hence define one ampere.

5628/(Set : A)/ I
S