HBSE Class 12 Question Paper 2021 Physics

CLASS : 12th (Sr. Secondary) Code No. 228
Series : SS – April/2021
Roll No.

HkkSfrd
PHYSICS
Hkkx – I
PART – I
¼vkRefu"B iz'u½
(Subjective Questions)
(Academic)
[ fgUnh ,oa vaxzsth ek/;e ]
[ Hindi and English Medium ]
(Only for Fresh/School 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.

228/ I P. T. O.

(2) 228
• iz'u-i= esa nkfgus gkFk dh vksj fn;s x;s dksM uEcj dks Nk= mÙkj-iqfLrdk ds eq[;-i`"B ij fy[ksaA
The Code No. 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 question, 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) vkids mÙkj vadkuqlkj gksus pkfg,A
Your answer should be according to marks.

228/ I

(3) 228
[k.M – v
SECTION – A
[ vfr&y?kwÙkjkRed iz'u ]
[ Very Short Answer Type Questions ]
1. fLFkj oS|qfrdh esa dwykWe dk fu;e crkb;sA 2
State Coulomb's Law in Electrostatics.
2. ,d LCR ifjiFk] ftlesa L = 2.0H, C = 32 µF rFkk R = 10Ω, vuqukn vko`fÙk ωo dk ifjdfyr
dhft,A 2
Obtain the resonant frequency ωo of a series LCR circuit with L = 2.0 H, C = 32
µF and R = 10 Ω.
3. fo|qr pqEcdh; rjaxsa D;k gS \ 2
What are electromagnetic waves ?
4. dksbZ VSad 12.5 m Å¡pkbZ rd ty ls Hkjk gSA fdlh lw{en'khZ }kjk chdj dh ryh ij iM+h fdlh lqbZ
dh vkHkklh xgjkbZ 9.4 cm ekih tkrh gS ty dk viorZukad D;k gS \ 2
A tank is filled with water to a height of 12.5 cm. The apparent depth of a
needle Lying at the bottom of the tank is measured by a microscope to be 9.4
cm. What is the refractive Index of water ?
5. vkbUlVhu dk izdk'koS|qr izHkko dk lehdj.k fyf[k,A fujks/kh foHko o vkifrr fofdj.k dh vko`fÙk esa
xzkQ cukb;sA 2
Write Einstein's Photoelectric Equation. Draw a graph between the stopping
potential and Frequency of the Incident light.
[k.M – c
SECTION – B
[ y?kwÙkjkRed iz'u ]
[ Short Answer Type Questions ]
6. oS|qr LFkSfrdh esa xkSl izes; dk mi;ksx djds ,d leku vkosf'kr yEcs rkj ds fudV ftldk js[kh;
vkos'k ?kuRo λ dwyke/ehVj gS] oS|qr {ks= dh rhozrk ds fy, O;atd O;qRiUu dhft,A 3
Obtain an expression for the Intensity of Electric field near a uniformly
charged straight wire of Infinite Length, with the help of Gauss's theorem in
Electrostatics.
7. oS|qr ifjiFk ds fy, fdjpkWQ ds fu;eksa dk vko';d ifjiFk fp= nsrs gq, mYys[k dhft,A 3
State Kirchoff's Laws for electrical circuits giving necessary circuit diagram.

228/ I P. T. O.

(4) 228
8. Hkoja /kkjk,¡ D;k gS \ ;s dSls mRiUu gksrh gSa \ Hkoj-/kkjkvksa dh nks mi;ksfxrkvksa ds uke crkb,A 3
What do you mean by eddy currents ? How it can be produced. Write the name
of applications of eddy currents.
9. gkbMªkstu ijek.kq ds fy, ÅtkZ-Lrj vkjs[k [khafp;s rFkk buesa ykbeu rFkk ckej Js.kh dh LisDVªeh
js[kkvksa ds fy, laØe.k fn[kkb,A 3
Draw the energy Level diagram Fer hydrogen atom and show transitions
corresponding to Lines of Lyman and Balmer Series.
10. p-n lfU/k Mk;ksM dk mi;ksx djds v)Z-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 HALF WAVE RECTIFIER using a p-n junction
diode. Show waveforms of input and output voltages.
[k.M – l
SECTION – C
[ nh?kZ mÙkjkRed iz'u ]
[ Long Answer Type Questions ]
11. nks yacs lh/ks lekarj pkydksa ds chp yxus okys cy ds fy, O;atd fudkfy, ftuesa fo|qr /kkjk foijhr
fn'kk esa cg jgh gksA vr% ,d ,sfEi;j dks ifjHkkf"kr dhft,A 5
Derive an expression for the force between two Long straight parallel
conductors carrying current in opposite direction. Hence define one Ampere.
vFkok
OR
f=T;k R ds fdlh o`Ùkkdkj ik'k ls /kkjk I izokfgr gks jgh gSA bl ik'k ds dsUnz ls blds v{k ij fLFkr
X nwjh ds fdlh fcUnq ij pqEcdh; {ks= ds fy, O;atd izkIr dhft,A
A circuit 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.
12. fdlh la;qDr lw{en'khZ esa izfrfcac cuus dk ukekafdr fdj.k vkjs[k cukdj le>kb,A bldh vko/kZu
{kerk dks ifjHkkf"kr djds blds fy, O;atd fyf[k,A 5
Draw a Labelled ray diagram showing image formation in a compound
microscope. Define its magnifying power and write expression for it.
vFkok
OR
What is wavefront ? Using Huygen's principle to verify the Laws of reflection.
rjaxkxz fdls dgrs gSa \ gkbxsUl ds fl)kUr dk mi;ksx djds ijkorZu ds fu;eksa dk lR;kiu dhft,A

228/ I
S

CLASS : 12th (Sr. Secondary) Code No. 228
Series : SS – April/2021
Roll No.

HkkSfrd
PHYSICS
Hkkx – II
PART – II
¼oLrqfu"B iz'u½
(Objective Questions)
(Academic)
[ fgUnh ,oa vaxzsth ek/;e ]
[ Hindi and English Medium ]
(Only for Fresh/School Candidates)

• Ñi;k tk¡p dj ysa fd Hkkx–II ds bl iz'u-i= esa eqfnzr i`"B 15 rFkk iz'u 35 gSaA
Please make sure that the printed pages in this question paper of Part-II are 15 in
number and it contains 35 questions.
• 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 question, 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.

228/ II P. T. O.

(2) 228
(ii) iz'u Øekad 1 ls 35 rd oLrqfu"B iz'u gSaA izR;sd iz'u 1 vad dk gSA
Questions from 1 to 35 are objective type questions. Each question is of
1 mark.
uhps fn, x, izR;sd iz'u esa lcls vf/kd mi;qDr fodYi pqfu, %
Select the most appropriate option from those given below in each
question :

1. + 1 µC rFkk + 4µC ds nks vkos'k ,d-nwljs ls dqN nwjh ij ok;q esa fLFkr gSA mu ij yxus okys
cyksa dk vuqikr gS % 1

(A) 1:4 (B) 4:1

(C) 1:1 (D) 1 : 16

Two charges + 1 µC and + 4µC are situated at a distance in air. The ratio of
forces acting on them is :

(A) 1:4 (B) 4:1

(C) 1:1 (D) 1 : 16

2. rhu cjkcj /kkfjrk C okys la/kkfj=ksa dks igys Js.khØe esa rFkk ckn esa lekUrj Øe esa tksM+k tkrk gSA
nksuksa n'kkvksa esa rqY; /kkfjrkvksa dk vuqikr gksxk % 1

(A) 9:1 (B) 6 :1

(C) 3:1 (D) 1 : 9

Three capacitors of equal capacity C are joined first in series and then in
parallel. The ratio of equivalent capacities in both the cases will be :

(A) 9:1 (B) 6 :1

(C) 3:1 (D) 1 : 9

228/ II

(3) 228
3. fof'k"V-izfrjks/k dk ek=d gS % 1

(A) vkse-eh
(B) vkse-eh–1
(C) vkse–1 eh–1
(D) vkse–1-eh
The unit of Specific resistance is :

(A) ohm-m

(B) ohm- m −1

(C) ohm −1 − m −1

(D) ohm −1 − m

4. ,d pkyd dh oksYVrk (v) rFkk /kkjk (i) ds chp xzkQ ,d ljy js[kk gS tks y-v{k ¼tks fd i dks iznf'kZr
djrk gS½ ls θ dks.k cukrh gSA pkyd dk izfrjks/k gksxk % 1

(A) tan θ (B) cot θ

(C) sin θ (D) cos θ

The graph between voltage (v) and current (i) for a conductor is a straight line
which makes an angle θ with y-axis (representing i). The resistance of the
Conductor will be :

(A) tan θ (B) cot θ

(C) sin θ (D) cos θ

228/ II P. T. O.

(4) 228
5. fdlh ,d leku pqEcdh; {ks= esa ,d bysDVªkWu {ks= ds yEcor~ izos'k djrk gSA bysDVªkWu dk iFk gksxk % 1

(A) ijoy;kdkj (B) nh?kZo`Ùkkdkj
(C) o`Ùkkdkj (D) ljy jSf[kd
An electron enters into a uniform magnetic field perpendicularly to it. The path
of the electron would be :

(A) Elliptical (B) Circular

(C) Parabolic (D) Linear

6. pqEcdh; {ks= (B ) ds lekukarj osx (v ) ls xfreku vkos'k q ij yxus okyk cy gS % 1

q v ×B
(A) (B)
v ×B q

(C) q( v × B ) (D) Zero

The force (F ) acting on a particle of charge q moving with velocity (v ) parallel to

magnetic field (B ) is :

q v ×B
(A) (B)
v ×B q

(C) q ( v × B ) (D) Zero

7. ,d dq.Myh ds fy;s LoizsjdRo 2 mH gSA blesa oS|qr /kkjk izokg dh nj 10 3 ,sfEi;j/lsd.M gSSA blesa
izsfjr okgd cy gS % 1

(A) 1 oksYV (B) 2 oksYV

(C) 3 oksYV (D) 4 oksYV

228/ II

(5) 228
For a coil-having self Inductance 2 mH, current flows at a rate of
10 3 ampere/sec in it. The emf induced in it is :

(A) 1 volt (B) 2 volt

(C) 3 volt (D) 4 volt

8. ysUt dk fu;e fdl HkkSfrd jkf'k ds laj{k.k ij vk/kkfjr gS \ 1

(A) vkos'k ds (B) laosx ds
(C) ÅtkZ ds (D) nzO;eku ds
Lenz's Law is a Consequence of the Law of Conservation of :

(A) charge (B) momentum

(C) energy (D) mass

9. ejhfpdk dh ifj?kVuk gksrh gS % 1

(A) ijkorZu ls
(B) fo{ksi.k ls
(C) izdh.kZu ls
(D) iw.kZ vkUrfjd ijkorZu ls
Mirage is a phenomena due to :

(A) Reflection

(B) Dispersion

(C) Scattering

(D) Total Internal Reflection

228/ II P. T. O.

(6) 228
10. ,d f}-mÙky ysUl ds nksuksa ryksa dh oØrk-f=T;k,¡ R cjkcj gSa rFkk bldk viorZukad 1.5 gSA ysUl
dh Qksdl-nwjh gksxh % 1

(A) R/2 (B) R

(C) –R (D) 2R

The two Surfaces of a bi-convex Lens have equal radii of curvature R and its
refractive Index n is 1.5. The focal Length of the Lens will be :

(A) R/2 (B) R

(C) –R (D) 2R

11. ,d fizTe ds fy;s vYire fopyu dk dks.k δm gS rFkk fizTe dk dks.k A gSA fizTe ds inkFkZ dk
viorZukad gS % 1

 A + δm  A
(A) sin   (B) sin
 2  2

 A + δm 
sin  
(C)
sin A / 2
(D)  2 
 A + δm  sin A / 2
sin 
 2 

The angle of minimum deviation for a prism is δm and the angle of prism is A.
The refractive index of the material of the prism is :

 A + δm  A
(A) sin   (B) sin
 2  2

 A + δm 
sin  
(C)
sin A / 2
(D)  2 
 A + δm  sin A / 2
sin 
 2 

228/ II

(7) 228
12. ok;q esa izdk'k dh pky 3 × 10 8 eh0/ls0 gSA 4/3 viorZukad okys ty esa izdk'k dh pky gksxh % 1

(A) 1.5 × 10 8 m/s

(B) 2 × 10 8 m/s

(C) 1 × 10 8 m/s

(D) 2.25 × 10 8 m/s

Speed of Light in air is 3 × 10 8 m/s . For the water of refractive Index 4/3, the
speed of light will be :

(A) 1.5 × 10 8 m/s

(B) 2 × 10 8 m/s

(C) 1 × 10 8 m/s

(D) 2.25 × 10 8 m/s

13. /kkfRod i`"B ls bysDVªkWu rc mRlftZr gksrs gSa tcfd i`"B ij vkifrr izdk'k dh vko`fÙk% % 1

(A) nsgyh vko`fÙk ls de gks

(B) nsgyh vko`fÙk ls vk/kh gks

(C) nsgyh vko`fÙk ls vf/kd gks

(D) vko`fÙk dk dksbZ izHkko ugha gS

228/ II P. T. O.

(8) 228
Electron emission from a metallic surface is possible only, when Frequency of
the incident Light is :

(A) Less Then threshold Frequency

(B) Half of the Threshold Frequency

(C) Greater than the Threshold Frequency

(D) No effect of Frequency

14. fdlh xfreku d.k ls c) ns-czkWXyh rjaxnS?;Z % 1

(A) blds nzO;eku ds vuqØekuqikrh gS

(B) bldh ÅtkZ ds vuqØekuqikrh gS

(C) blds laosx ds vuqØekuqikrh gS

(D) blds laosx ds O;qRØekuqikrh gS

The de-Brogile wavelength associated with a moving particle is :

(A) Directly proportional to its mass

(B) Directly proportional to its energy

(C) Directly proportional to its momentum

(D) Inversely proportional to its momentum

228/ II

(9) 228
15. gkbMªkstu ijek.kq es r f=T;k dh d{kk esa bysDVªkWu dh xfrt ÅtkZ gS % 1

1 e2 1 e2
(A) − . (B) .
4π ∈0 r 4π ∈0 2r

1 e2 1 e2
(C) . (D) − .
4π ∈0 r 4π ∈0 2r

In hydrogen atom, the Kinetic energy of electron in an orbit of radius r is given
by :

1 e2 1 e2
(A) − . (B) .
4π ∈0 r 4π ∈0 2r

1 e2 1 e2
(C) . (D) − .
4π ∈0 r 4π ∈0 2r

16. M~;wVsfj;e (1 H 2 ) ds ukfHkd esa U;wfDy;kuksa ds izdkj ,oa la[;k gksxh % 1

(A) 2 izksVkWu

(B) 1 izksVkWu ,o 1 U;wVªkWu

(C) 2 U;wVªkWu

(D) 1 izksVkWu ,oa 1 bysDVªkWu

228/ II P. T. O.

( 10 ) 228
Number and type of nucleons in the nucleus of Deuterium (1 H 2 ) will be :

(A) 2 protons

(B) 1 proton and 1 neutron
(C) 2 neutrons

(D) 1 proton and 1 electron

17. ,d inkFkZ dk ÅtkZ cS.M fp= esa fn[kk;k x;k gS tgk¡ V la;ksth cS.M rFkk C pkyu cS.M gS] ;s inkFkZ
gS % 1
C

Eg < 3eV

V

(A) pkyd (B) v)Zpkyd
(C) dqpkyd (D) ghjk
Energy band of a substance is shown in Figure. Where V is valence band and
C is conduction band.

C

Eg < 3eV

V
This substance is :

(A) Conductor (B) Semi conductor

(C) Insulator (D) Diamond
228/ II

( 11 ) 228
18. n-Vkbi ds v)Zpkyd esa vYila[;d vkos'k okgd gksrs gSa % 1

(A) bysDVªkWu (B) gksy
(C) bysDVªkWu rFkk gksy (D) buesa ls dksbZ ugha
In a n-type Semi Conductor the minority charge carriers are :
(A) Electron (B) Hole

(C) Electron and hole (D) None of these

mi;qDr mÙkj ls fjDr LFkkuksa dh iwfrZ dhft, %
Fill in the blanks with Appropriate answer :

19. ……………. dk ek=d oksYV gSA 1

Volt is unit of ……………… .

20. fdlh pkyd ds fn, x, {ks=Qy ls izokfgr /kkjk ml {ks=Qy ls izfr ,dkad le; esa xqtjus okyk usV
……………. gksrk gSA 1

Current through a given area of a conductor is the net ……………. passing per
unit time through the area.

21. i`Foh dh lrg ij blds pqacdh; {ks= dk fooj.k nsus ds fy, rhu jkf'k;k¡ vko';d gSaA pqacdh; {ks= dk
{kSfrt vo;o] pqacdh; fnd~ikr ,oa ……………. A 1

Three quantities are needed to specify the magnetic field of the Earth on its
Surface-the horizontal component, the magnetic declination and ……………..

228/ II P. T. O.

( 12 ) 228
22. fdlh izR;korhZ /kkjk tfu= esa ;kaf=d ÅtkZ dks ……………. esa :ikarfjr djrs gSaA 1

In an ac generator, mechanical Energy is converted to ………… .

23. X fdj.ks]a γ-fdj.ksa rFkk jsfM;ksa rjax ds fuokZr esa pyus ij mudh ……………. leku ijUrq rjaxnS?;Z
vleku gksrh gSA 1

X-rays γ-rays and radiowaves are propagating in vacuum, there ……………….
will be same but frequencies will be different.

24. l?ku ek/;e ls fojy ek/;e esa vkifrr fdj.k ds fy, ……………. og dks.k gS ftlds fy,
viorZu dks.k 90 o gSA 1

The ………………….. angle for a ray incident from a denser to rarer medium, is

that angle for which the angle of refraction is 90 o .

25. λ rjaxnS?;Z ds QksVkWu dh ÅtkZ ……………. gSA 1

The energy of photon of wavelength λ is ………………… .

26. jnjQksMZ-ekWMy esa ijek.kq dk lokZf/kd nzO;eku vkSj bldk dqy /kukos'k ,d lw{e ukfHkd esa ladsfUnzr
gksrk gS rFkk ……………. blds pkjksa vksj ifjØek djrs gSaA 1

In Rutherford's model, most of the mass of the atom and all its positive charge
are concentrated in a tiny nucleus and the ………….. revolved around it.

27. …………… v/kZpkydksa esa bysDVªkWuksa dh la[;k (ne) gksyksa dh la[;k (nn) leku gksrh gSA 1

The number of electrons (n e ) is equal to the number of holes (n n ) in …………

Semi conductors.

228/ II

( 13 ) 228
fuEufyf[kr ds mÙkj nhft, %
Answer the following :

28. /kkjk ?kuRo (J)] fof'k"V pkydrk (σ) rFkk oS|qr {ks= (E) esa lEcU/k dk lw= fyf[k,A 1

Write down the formula for the relation of current density (J) specific
conductivity (σ) and the electric field (E).

29. lsy ds fo|qr okgd cy ,oa VfeZuy foHkokUrj esa lEcU/k fyf[k,A 1

Write relation between Electromotive force and terminal potential difference for
a cell.

30. layXu fp= esa iznf'kZr ifjiFk esa APB rFkk AQB oxZ ds Hkkx gSaA oxZ ds dsUnz O ij pqEcdh; {ks=
D;k gksxk \ 1
P

i i
A O B

Q

Consider the circuit shown where APB and AQB are parts of square. What will
be the Magnetic field at the centre O of the square.

P

i i
A O B

Q

228/ II P. T. O.

( 14 ) 228
31. + 5 Mk;ksIVj rFkk – 5 Mk;ksIVj {kerk okys nks irys ysUl lEidZ esa j[ks gSaA bl la;ksx dh {kerk Kkr
dhft,A 1

Two thin Lenses of power +5 dioptre and –5 dioptre are placed in contact. Find

the power of this Combination.

32. dkap esa fdl LisDVªeh jax ds izdk'k dh pky lcls vf/kd gksrh gS \ 1

For which spectral colour of Light is the speed Maximum in glass ?

33. ;ax ds iz;ksx esa cSaxuh izdk'k ds LFkku ij lksfM;e ySEi dk ihyk izdk'k iz;qDr djus ij fÝUt dh
pkSM+kbZ ij D;k izHkko iMs+xk \ 1

In Young's experiment what will be the effect on fringe-width on using yellow
colour light of sodium Lamp in place of violet colour light ?

34. nks ukfHkd ftudh nzO;eku la[;k,¡ 1 : 8 ds vuqikr esa gSaA muds ukfHkd ?kuRoksa dk vuqikr D;k

gksxk \ 1

Two nuclei have mass numbers in the ratio 1 : 8. What is the ratio of nuclear
density ?

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35. fn;s x;s fp= esa lfU/k Mk;ksM vxz-vfHkur gS vFkok mRØe-vfHkurA 1

–10V +7V

Is the Junction diode D is forward or reverse biased, in the given diagram

–10V +7V

S

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