HBSE Class 12 Sample Paper 2025 Physics

Board Of School Education Haryana

मॉडल पेपर
2025

BSEH MODEL PAPER (2024-25)
Class 12th (Sr. Secondary)
Roll No
PHYSICS
(Hindi and English Medium)
ACADEMIC/OPEN
[Time allowed: 3 hours] [Maximum Marks: 70]

lkekU; funsZ'k%
1. iz'u i=k esa oqQy 35 iz'u gSA
2. lHkh iz'u vfuok;Z gSA
3. ;g iz'u i=k ik¡p [k.Mksa esa foHkkftr gSA [kaM&A, [kaM&B, [kaM&C, [kaM&D, vkSj [kaM&E A
4. [kaM&A esa vBkjg (1-18) oLrqfu"B iz'u gS] izR;sd iz'u 1 vad dk gSA
5. [kaM&B esa lkr (19-25) vfr y?kq mÙkjkRed iz'u gSA izR;sd iz'u 2 vad dk gSA
6. [kaM&C esa ik¡p (26-30) y?kq mÙkjh; iz'u gSA izR;sd iz'u 3 vad dk gSA
7. [kaM&D esa nks (31-32) osQl vè;;u iz'u gS] izR;sd iz'u 4 vad dk gSA
8. [kaM&E esa rhu (33-35) nh?kZ mÙkjkRed iz'u gS] izR;sd iz'u 5 vad dk gSA
9. dksbZ lexz fodYi ugha gSA ;|fi [k.MµA, B, C, D vkSj E esa vkarfjd fodYi fn, gSA bu lc iz'u esa
vkidks ,d fodYi pquuk gSA
10. vad x.kd dk iz;ksx o£tr gSA
General Instructions:
1. There are 35 questions in all.
2. All questions are Compulsory.
3. This question paper is divided into five sections. A, B, C, D and E.
4. Section-A consists of eighteen (1-18) objective type questions each of 1 mark.
5. Section-B consists of seven (19-25) very short answer type questions each of 2 marks.
6. Section-C consists of five (26-30) short answer type questions each of 3 marks.
7. Section-D consists of two (31-32) case study type questions each of 4 marks.
8. Section-E consists of three (33-35) long answer type questions each of 5 marks.
9. There is no overall choice however an internal choice has been provided in Section B, C, D
and E. You have to attempt only one of the given choice in such questions.
10. Use of calculator is not permitted.

SECTION-A

1. ukfHkdh; vfHkfozQ;k N7 + He2 → X + H1 esa] X fdldk fu:i.k djrk gS\
14 4 1
1
16 17 17 16
(a) O7 (b) N8 (c) O8 (d) N7
14 4 1
In the nuclear reaction N7 + He2 → X + H1, X represents:

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16 17 17 16
(a) O7 (b) N8 (c) O8 (d) N7

2. fdlh NM+ pqEcd dks mldks pqEcdh; v{k osQ lekUrj nks cjkcj Hkkxksa esa dkVk x;k gSA vifjofrZr jgus
okyh HkkSfrd jkf'k gS% 1
(a) /zqo izkcY; (b) pqEcdRo dk ifjek.k (c) tM+Ro vk/w.kZ (d) pqEcdh; vk/w.kZ
A bar magnet is cut into two equal halves parallel to its magnetic axis. The physical
quantity that remains unchanged is:
(a) pole strength (b) magnitude of magnetisation
(c) moment of inertia (d) magnetic moment
3. fdlh ekè;e esa xeu djrs le; X&fdj.kksa] yky izdk'k vkSj jsfM;ksa rjaxksa osQ fy, fuEufyf[kr esa ls
dkSu&lh HkkSfrd jkf'k leku jgrh gS\ 1
(a) rjax nSè;Z (b) pky (c) vko`fr (d) laosx
Which of the following physical quantity remain the same for X-ray, red light and radio
waves when travelling through a medium?
(a) wavelength (b) speed (c) frequency (d) momentum
4. fdlh Js.kh LC ifjiFk esa] tks fdlh a.c. L=kksr ls la;ksftr gS] L=kksr dh vko`fr esa o`f¼ gksus ij usV
izfr?kkr% 1
(a) jSf[kdr% c<+rh gS
(b) jSf[kdr% ?kVrh gS
(c) igys c<+dj vf/dre gks tkrh gS vkSj fiQj ?kVdj 'kwU; gks tkrh gSA
(d) igys ?kVdj 'kwU; gks tkrh gS vkSj fiQj c<+rh gSA
In a series LC circuit connected to an ac source, with the increase in the frequency of the
source, the net reactance:
(a) increases linearly
(b) decreases linearly
(c) first increase to become maximum and then decreases to zero
(d) first decreases to become zero and then increases
λ
5. ;ax osQ f}f>jh iz;ksx esa ins± osQ fdlh fcUnq tgk¡ iFkkUrj λ gS] ogk¡ rhozrk I0 gSA ftl fcUnq ij iFkkUrj
4
gS] ogk¡ rhozrk gksxh% 1
I0 I0
(a) (b)
4 2

(c) I0 (d) 'kwU;

In Young’s double-slit experiment, the intensity on the screen is I0 at a point where path
π
difference is λ. The intensity at the point where path difference is:
4
I0 I
(a) (b) 0
2 2
(c) I0 (d) zero

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6. fuEufyf[kr esa ls dkSu&lh vko`Qfr fdlh d.k osQ laosx osQ lkFk mlls lac¼ ns czkWXyh rjaxnSè;Z osQ fopj.k
dk fu:i.k djrh gS\ 1

(a) (b)

(c) (d)

Which of the following figures represents the variation of a particle’s momentum with the
de Broglie wavelength associated with it?

(a) (b)

(c) (d)

7. dksbZ lery rjax oozQrk f=kT;k R osQ fdlh vory niZ.k ij vkiru dj jgh gSA ijkofrZr rjax dksbZ xksyh;
rjax gksrh gS ftldh f=kT;k gksrh gS% 1
R R
(a) (b) (c) R (d) 2 R
4 2
A plane wave is incident on a concave mirror of radius of curvature R. The reflected wave
is a spherical wave of radius:
R R
(a) (b) (c) R (d) 2 R
4 2
8. fdlh y{; ukfHkd dk mixeu djrs le; fdlh ,sYiQk d.k osQ fy, la?kV~V izkpy rc vf/dre gksrk gS
tc izdh.kZu dks.k (θ) gksrk gS% 1
(a) 0° (b) 90° (c) 180° (d) 45°

Page-3

The impact parameter for an alpha particle approaching a target nucleus is maximum
when the scattering angle (θ) is:
(a) 0° (b) 90° (c) 180° (d) 45°
9. dksbZ y?kq fcEc H mQ¡pkbZ rd ty (viorZukad 4/3) ls Hkjs fdlh ik=k dh rygVh ij gSA ty osQ i`"B
osQ mQij osQ fdlh fcUnq ls ns[kus ij ;g fcEc H dk n izfr'kr mQij mBk gqvk izrhr gksrk gSA n dk eku
gS% 1
(a) 15 (b) 20 (c) 25 (d) 33
A small object lies at the bottom of a vessel filled with water (refractive index 4/3) up to a
height H. When viewed from a point above the surface of water, the object appears raised
by n percent of H. The value of n is :
(a) 15 (b) 20 (c) 25 (d) 33
10. pkyd osQ Hkhrj oS?kqr {ks=k fdruk gksrk gS\ 1

What is the electric field inside a conductor?
11. ,d ρ izfrjks/drk okyh rkj dks mldh ewy yackbZ ls rhu xq.kk [khapk tkrk gSA ml rkj dh ubZ izfrjks/drk
fdruh gksxh\ 1

A wire of resistivity ρ is stretched to three times of its original length what will be its new
resistivity?
12. X3 vkSj Y3 esa] ls dkSu vf/d fLFkj gS\
7 4
1
7 4
Out of X3 and Y3, which one is more stable.
13. -------------------- ij v/Zpkyd ,d fo|qrjks/h dh Hkk¡fr O;ogkj djrk gSA 1
The semiconductor behaves as an insulator at .................... .
14. tc fdlh la/kfj=k dh ifV~Vdkvksa osQ chp dksbZ ijkoS|qr inkFkZ iw.kZr% Hkj fn;k tkrk gS] rks mlosQ /kfjrk osQ
eku esa fuokZr osQ eku ls -------------------- gks tkrh gSA 1
The capacitance .................... from its vacuum value, when the dielectric is inserted fully
between the plates of a capacitor.
15. izdk'k dh d.kh; izo`Qfr dks .................... n`"VkUr nsrk gSA 1
.................... illustrate the particle nature of light.
funsZ'k (16-18) nks dFku fn, x, gSµ ,d vfHkdFku (A) vkSj nwljk dkj.k (R)A uhps fn, x, dksM esa ls
lgh mÙkj pqfu,A
(a) A vkSj R nksuksa lR; gS] vkSj R, A dh lgh O;k[;k gSA

(b) A vkSj R nksuksa lR; gS] R, A dh lgh O;k[;k ugha gSA

(c) A lR; gS] ijUrq R vlR; gSA

(d) A vlR; gS vkSj R Hkh vlR; gSA

Directions (16-18) Two statements are given one labelled Assertion (A) and other labelled
Reason (R). Select the correct answer codes given below.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.

Page-4

(c) A is true abut R is false.
(d) A is false but R is also false.
16. vfHkdFku (A) % v/Zpkyd ;qfDr;ksa osQ fuekZ.k esa tesZfu;e osQ LFkku ij flfydkWu dks ojh;rk nh tkrh
gSA 1
dkj.k (R) % flfydkWu dh rqyuk esa tesZfu;e esa mQtkZ vUrjky vf/d gksrk gSA
Assertion (A) : Silicon is preferred over germanium for making semiconductor devices.
Reason (R) : The energy gap for germanium is more than the energy gap for silicon.
17. vfHkdFku (A) % fdlh /kjkokgh ifjukfydk }kjk mRiUu pqEcdh; {ks=k mldh yackbZ vkSj vuqizLFk&dkV
ij fuHkZj ugha djrk gSA 1
dkj.k (R) % ifjukfydk osQ Hkhrj mRiUu pqEcdh; {ks=k ,dleku gksrk gSA
Assertion (A) : The magnetic field produced by a current carrying solenoid is
independent of its length and cross-sectional area.
Reason (R) : The magnetic field inside the solenoid is uniform.
18. vfHkdFku (A) % fdlh fo|qr {ks=k esa fdlh cUn iFk osQ pkjksa vksj fdlh vkos'k dks xeu djkus esa fd;k
x;k dk;Z 'kwU; gksrk gSA 1
dkj.k (R) % fLFkj fo|qr cy laj{kh cy gksrk gSA
Assertion (A) : Work done is moving a charge around a closed path in an electric field is
always zero.
Reason (R) : Electrostatic force is a conservative force.

SECTION-B

19. vojDr rjaxsa fdl izdkj mRiUu gksrh gS\ bu rjaxksa dks m"eh; rjaxsa D;ksa dgk tkrk gS\ 2
vFkok
X&fdj.ksa fdl izdkj mRiUu gksrh gS\ bu fdj.kksa osQ dksbZ nks mi;ksx fyf[k,A

How are infrared wave produced? Why are these waves referred to as heat waves?
Or
How are X-rays produced? Give any two uses of these.
20. fdlh irys ysal dh {kerk +5D gSA tc bl ysal dks fdlh nzo esa Mqcks;k tkrk gS rks ;g 100 cm iQksdl
nwjh osQ vory ysal dh Hkk¡fr O;ogkj djrk gSA bl nzo dk viorZukad ifjdfyr dhft,A fn;k gSµ dk¡p
dh viorZukad 1.5 gSA 2

The power of a thin lens is +5D. When it is immersed in a liquid it behaves like a concave
lens of focal length 100 cm. Calculate the refractive index of the liquid. Given refractive
index of glass = 1.5.
21. vk;uu mQtkZ ls D;k rkRi;Z gS\ gkbMªkstu ijek.kq osQ fy, bldk eku fyf[k,A 2
vFkok

Page-5

nzO;eku {kfr dh ifjHkk"kk fyf[k,A ukfHkd osQ LFkkf;Ro ls ;g fdl izdkj lacaf/r gS\
What is meant by ionisation energy? Write its value for hydrogen atom?
Or
Define the term mass defect. How is it related to stability of the nucleus?
22. T > 0 K osQ fy, fdlh n&izdkj vkSj p-izdkj osQ v/Zpkydksa osQ fy, mQtkZ cS.M vkjs[k [khafp,A 2

Draw energy band diagram for an n-type and p-type semiconductor at T > 0 K.
23. in pqEcdh; izo`fÙk dh ifjHkk"kk nhft,A nks pqEcdh; inkFkksZ A vkSj B dh vkisf{kd pqEcd'khyrk,¡ 0.96
vkSj 500 gSaA pqEcdh; inkFkksZ A vkSj B dks igpkfu,A 2

Define the term magnetic susceptibility. Two magnetic materials A and B have relative
permeabilities of 0.96 and 500. Identify the magnetic materials A and B.
24. fLFkj&oS|qfrdh esa owQykWe fu;e dk mYys[k dhft, vkSj bls nks vkos'kksa osQ fy, lfn'k :i esa fyf[k,A 2

State Coulomb’s law in electrostatics and write it in vector form, for two charges.
25. izfrjks/ fdl izdkj izfrck/k ls fHkUu gS\ 2
How does resistance differ from impedance?

SECTION-C

26. ifjiFk vkjs[k dh lgk;rk ls p-n laf/ Mk;ksMksa osQ mi;ksx ls fdlh iw.kZ rjax fn"Vdkjh dh fozQ;kfof/ dh
la{ksi esa O;k[;k dhft,A 3
vFkok
fdlh p-n laf/ Mk;ksM dk V-I vfHkyk{kf.kd [khafp,A O;k[;k dhft, fd Mk;ksM osQ ;g vfHky{k.k bls
fdl izdkj fn"Vdj.k osQ fy, mi;qDr cukrs gSaA
With the help of circuit diagram, briefly explain the working of a full-wave rectifier using
p-n junction diode.
Or
Draw V-I characteristics of a p-n junction diode. Explain how these characteristics make a
diode suitable for rectification.
27. mixeu dh lehiLFk nwjh dh ifjHkk"kk fyf[k,A lw=k osQ }kjk ;g le>kb, fd ;fn fdlh α&d.k dh xfrt
mQtkZ nks xquh dj nh tk, rks bl nwjh ij D;k izHkko iM+sxk\ 3

Define the term-distance of closest approach. How will it be affected for an α-particle, if
kinetic energy of the particle, is doubled?
28. tc fdlh /krq osQ i`"B dks 330 nm rjaxnSè;Z osQ ijkcSaxuh izdk'k }kjk iznhIr fd;k tkrk gS rks mlls
izdkf'kd bySDVªkWu mRlftZr gksrs gSaA bl i`"B ls bySDVªku mRltZu osQ fy, 3.5 × 10–19J dh fuEure mQtkZ
pkfg,A 3

ifjdfyr dhft,%

Page-6

(i) vkifrr fofdj.kksa dh mQtkZ] rFkk
(ii) izdkf'kd bySDVªku dh xfrt mQtkZ
Photoelectrons are emitted from a metal surface when illuminated with UV light of
wavelength 330 nm. The minimum amount of energy required to emit the electrons from
–19
the surface is 3.5 × 10 J. Calculate:
(i) the energy of incident radiation, and
(ii) the kinetic energy of the photoelectron.
29. (i) fdlh ,dleku fo|qr {ks=k →
E esa fLFkr f}/qzo vk?kw.kZ p osQ fdlh fo|qr f}/zqo }kjk vuqHko fd, tkus
okysµvk?kw.kZ τ osQ fy, O;atd izkIr dhft,A 3

(ii) ;fn {ks=k ,dleku ugha gS] rks D;k gksxk\
(i) Obtain expression for the torque →
τ experienced by an electric dipole of dipole
→
moment →
p in a uniform electric field E .
(ii) What will happen if the field were not uniform?
vFkok
12 pf osQ nks loZle la?kkfj=k Js.kh ozQe esa la;ksftr gSa vkSj bl la;kstu osQ fljksa ls 50V dh cSVjh la;ksftr
gSA bl la;kstu esa lafpr oqQy mQtkZ fdruh gS\ izdj.k esa cSVjh ls yh xbZ /kjk Hkh Kkr dhft,A
Two identical capacitors of 12 pf each are connected in series across a battery of 50V. How
much electrostatic energy is stored in the combination? Find the charge drawn from the
battery.
30. fdj[kksiQ osQ nks fu;e fyf[k,A la{ksi esa O;k[;k dhft, fd ;s fdl izdkj U;k;laxr gSaA 3
State the two Kirchhoff’s laws. Explain briefly how these rules are justified.

SECTION-D (CASE STUDY)

31. izfrjks/d vkse osQ fu;e dk ikyu djrk gS tcfd Mk;ksM ugha djrk gSA ;g n`<+dFku fd V = IR vkse osQ
fu;e dk izdFku gS] lR; ugha gSA ;g lehdj.k izfrjks/ dks ifjHkkf"kr djrk gS vkSj bls lHkh pkyd
;qfDr;ksa esa iz;qDr dj ldrs gSa] pkgs og vkse osQ fu;e dk ikyu djrh gSa ;k ughaA vkse dk fu;e nkok
djrk gS fd V vkSj I osQ chp xzkiQ jsf[kd gS vFkkZr~ R] V ij fuHkZj ugha djrk gSA
(i) dkSu lk lw=k lgh gS% 1
(a) J=σE (b) ρ = J E (c) E = ρ J (d) (a) vkSj (c) nksuksa

(ii) 3 KΩ izfrjks/d osQ fljksa osQ chp 12V dk foHkokUrj yxk;k x;k gSA blesa ls fdruh fo|qr /kjk cg
jgh gS\ 1
(a) 3 mA (b) 4 mA (c) 4 A (d) 48 mA
OR
oS|qr pkydrk (σ) dh foek fyf[k,A

Page-7

(iii) izfrjks/drk osQ rki xq.kkad (α) dks ifjHkkf"kr dhft,A 1

(iv) /kjk ?kuRo (J) oSQlh jkf'k gSµ lfn'k ;k vfn'kA 1
A resistor obeys Ohm’s law while a diode does not. The assertion that V = IR is a
statement of Ohm’s law is not true. This equation defines resistance and it may be applied
to all conducting devices whether they obey Ohm’s law or not. The Ohm’s law asserts that
the plot of I versus V is linear i.e. R is independent of V.
(i) Which formula is correct:
(a) J=σE (b) ρ = J E (c) E = ρ J (d) both (a) and (c)
(ii) A potential difference of 12V is applied across the ends of a 3kΩ resistor. How much
current is flowing through it?
(a) 3 mA (b) 4 mA (c) 4 A (d) 48 mA
OR
Write the dimensions of electrical conductivity (σ).
(iii) Define temperature coefficient of resistivity (α).
(iv) Current density (J) is which type of quantity— scalar or vector.
32. rjaxksa dk egÙoiw.kZ rFkk u;k Lo:i fHkUu L=kksrksa osQ vk;keksa dk O;frdj.k gs] tks ;ax osQ iz;ksx esa n'kkZ,
vuqlkj] laiks'kh ;k fouk'kh nksuksa gks ldrk gSA foorZu ifj?kVuk ls fdj.k izdkf'kdh dh ifjlhek ifjHkkf"kr
gksrh gSA nks cgqr fudVLFk oLrqvksa osQ foHksnu osQ fy, lw{enf'kZ;ksa vkSj nwjnf'kZ;ksa dh l{kerk dh lhek,¡ Hkh
izdk'k dh rjaxnSè;Z }kjk fu/kZfjr gksrh gSaA vf/dka'k O;frdj.k rFkk foorZu izHkko vuqnSè;Z rjaxksa] tSls ok;q
esa èofu osQ fy, Hkh gksrs gSaA ijarq /zqo.k ifj?kVuk osQoy vuqizLFk rjaxksa tSls izdk'k rjaxksa dh fof'k"Vrk gSA
(i) dyk&lac¼ L=kksrksa dks ifjHkkf"kr dhft,A 1

(ii) ;ax osQ f}f>jh iz;ksx esa laiks"kh vkSj fouk'kh O;frdj.k osQ fy, iFkkUrj dh 'krZ fyf[k,A 1

(iii) rhozrk I0 dk v/qzfor izdk'k nks ozQkflr iksyjkWbMks ij vkiru djrk gSA bl la;kstu ls ikjxfer izdk'k
dh rhozrk D;k gksxhA 1
OR
lery /zqfor izdk'k ls D;k rkRi;Z gSA
(iv) O;frdj.k iSVuZ D;k gksrk gS tc nks dyklac¼ L=kksr ,d nwljs ls dkiQh nwjh ij gks\ 1
The crucial new feature of waves is interference of amplitudes from different sources
which can be both constructive and destructive as shown in Young’s experiment.
Diffraction phenomena define the limits of ray optics. The limit of the ability of
microscopes and telescopes to distinguish very close objects is set by the wavelength of
light. Most interference and diffraction effects exist even for longitudinal waves like sound
in air. But polarisation phenomena are special to transverse waves like light waves.
(i) Define the term-coherent sources.
(ii) Write the conditions on path difference under which constructive and destructive
interference occur in Young’s double slit experiment.
(iii) Unpolarised light of intensity I0 is incident on two crossed polaroids. What will be the
intensity of light transmitted by combination?
OR
What is meant by plane polarised light?

Page-8

(iv) What happens to the interference pattern when two coherent sources are far apart
from each other.

SECTION-E

33. nks yacs lh/s lekarj pkydks osQ chp yxus okys cy osQ fy, O;atd fudkfy, ftuesa] fo|qr /kjk ,d gh
fn'kk esa cg jgh gksA vr% ,d ,sfEi;j dks ifjHkkf"kr dhft,A 5
vFkok
py oqaQMyh xSYosuksehVj dk fp=k cukdj fl¼kar] jpuk o dk;Z fof/ le>kb,A
Derive an expression for the force between two long straight parallel conductors carrying
current in same direction. Hence define one ampere.
Or
Explain principle, construction and working of moving coil galvanometer by drawing its
diagram.
34. iw.kZ vkarfjd ijkorZu D;k gS\ iw.kZ vkarfjd ijkorZu dh ifj?kVuk osQ laHko gksus osQ fy, vko';d 'krks± dk
mYys[k dhft,A vko';d vkjs[k dh lgk;rk ls la{ksi esa Li"V dhft, fd iw.kZ vkarfjd ijkorZu dh
ifj?kVuk dk mi;ksx izdkf'kd rUrqvksa esa oSQls fd;k tkrk gSA 5
vFkok
gkbxsal dk fl¼kar fyf[k,A gkbxsal jpuk dk mi;ksx djrs gq, fdlh lery rjax dk lery i`"B ls
viorZu le>kb,A
What is total internal reflection? State the essential conditions for the phenomenon of total
internal reflection to take place. Explain briefly with the help of a necessary diagram, how
the phenomenon of total internal reflection is used in optical fibres.
Or
State Huygen’s Principle. Using Huygen’s construction explain refraction of a plane wave
by a plane surface.
35. (i) ,d 'kq¼ la/kfj=k dks fdlh izR;korhZ /kjk L=kksr ls tksM+k tkrk gS] rks ,d pj.k vkjs[k cukb, vkSj
;g fn[kk,a fd oksYVrk ,oa /kjk esa dykarj 90° dk gSA 3

(ii) iSQjkMs osQ oS|qrpaqcdh; izsj.k fu;e fyf[k,A 2
(i) Draw a phasor diagram when a pure capacitor is connected to an alternating source
and show that there is a phase difference of 90° between the voltage and current.
(ii) Write down the Faraday’s laws of electromagnetic induction.
vFkok
izR;korhZ /kjk tfu=k D;k gS\ fp=k vkjs[k dh lgk;rk ls fl¼kar o dk;Zfof/ le>kb,A
What is A.C. generator? With the help of circuit diagram explain its principle and
working.

Page-9

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