HBSE Class 12 Sample Paper 2027 Physics

FOR HARYANA CLASS 12 PREPARATION

HBSE Class 12 Sample
Paper 2027 Physics
EXAM YEAR TYPE SUBJECT

Haryana Class 12 2027 Sample Paper Physics

Notes · Sample Papers · Previous Year Papers · Mock Tests

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BSEH MODEL PAPER (2026-2027)
Class 12th (Sr. Secondary) Role No. ............

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PHYSICS

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(Hindi and English Medium)

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ACADEMIC/OPEN

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[Time allowed: 3 hours] [Maximum Marks: 70]

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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

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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

em
vkidks ,d fodYi pquuk gSA
10. vad x.kd dk iz;ksx o£tr gSA
l a s
General Instructions:
1. There are 35 questions in all. a g
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.

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8. Section-E consists of three (33-35) long answer type questions each of 5 marks.

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9. There is no overall choice however an internal choice has been provided in Section B, C, D

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and E. You have to attempt only one of the given choice in such questions.

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10. Use of calculator is not permitted.

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[k.M&v

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section-A

a (oLrqfu"B iz'u)
[Objecttive Type Questions]
fuEufyf[kr cgqfodYih; iz'uksa dh lgh fodYi pqfu,%
Select the current option of the following multiple choicequestions:
1. {kerk 2.0 D dk dksbZ ysal –1.0 D {kerk osQ fdlh vU; ysal osQ lEioZQ esa j[kk gSA ;g la;kstu fuEufyf[kr
esa ls fdldh Hkk¡fr O;ogkj djsxk\
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(a) f = 100 cm osQ vfHklkjh ysal (b) f = 100 cm osQ vilkjh ysal
(c) f = 50 cm osQ vfHklkjh ysal (d) f = 50 cm osQ vilkjh ysal
A lens of power 2.0 D is placed in contact with another lens of power -1.0 D. The combination

will behave as a :
(a) Converging lens of f = 100 cm (b) Diverging lens of f = 100 cm
(c) Converging lens of f = 50 cm (d) Diverging lens of f = 50 cm
2. fdlh la;qDr lw{en'khZ osQ vfHkn`';d vkSj usf=kdk dh iQksdl nwjh ozQe'k% f0 vkSj fe gSA fdlh lw{e fcEc
dk vf/d vko/Zu izkIr djus osQ fy, lw{en'khZ esa gksuk pkfg,%
(a) f0 vkSj fe de] vkSj fe > f0 (b) f0 vkSj fe de] vkSj f0 > fe
(c) f0 vkSj fe vf/d] vkSj fe > f0 (d) f0 vkSj fe vf/d] vkSj f0 > fe
A compound microscope has an objective and an eye piece of focal length f0 and fe
respectively. To obtain a large magnification of a small object, the microscope should have:
(a) f0 and fe small, and fe > f0 (b) f0 and fe small, and f0 > fe
(c) f0 and fe large, and fe > f0 (d) f0 and fe large, and f0 > fe
3. v/Zpkyd dh pkydrk] Mksfiax ij%
(a) c<+rh gS (b) leku jgrh gS (c) ?kVrh gS (d) buesa ls dksbZ ugha
On doping the conductivity of semiconductor:

(a) increases (b) remains same (c) decreases (d) none of these
4. fuEu esa ls dkSu&lk Mk;ksM vxzfnf'kd ck;flr gSA

(a)

(b)

(c)

(d)

Which of the following diode is forward biased:


(a)

(b)

(c)

(d)

5. xkek&fdj.kksa dk fuokZr esa pky dk D;k eku gS\
C C
(a) 2 C (b) C (c) (d)
2 2

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What is the value of speed of g-rays in vacuum?
C C
(a) 2 C (b) C (c) (d)
2 2

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6. nks izksVkWuksa osQ eè; yxus okys fo|qr cy dh izo`Qfr gksrh gS%

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(a) vkdf"kZr (b) mnklhu

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s
(c) izfrdf"kZr (d) mijksDr esa ls dksbZ ugha

(a) s em
Nature of electric force between two protons is:

g l a
g a
l Repulsive
Attractive (b) Neutral
a
a
(c) (d) None of the these
7. fuEu esa ls ^'kUV* osQ fy, iz;ksx gks ldrk gS%
(a) T;knk izfrjks/ (b) de izfrjks/ (c) nksuksa (d) dksbZ ugha
Which of the following can be used as ‘shunt’?

(a) High resistance (b) Low resistance (c) Both (d) None
8. ,d Js.khc¼ LCR ifjiFk osQ fy, vuquknh vko`fÙk dk dkSu lk lw=k lgh gS%
1 1 L L
(a) w = (b) w = (c) w = (d) w =

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LC LC C C

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Which relation is correct regarding resonance frequency for a LCR circuit:


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1 1 L L

s
(a) w = (b) w = (c) w = (d) w =

a
LC LC C C

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a
9. ,d y{; ukfHkd osQ ikl vkrs gq, ,d vYiQk d.k osQ fy, la?kV~V vf/dre gksrk gS] rks izdh.kZu dks.k
gksrk gSµ
(a) 0° (b) 90° (c) 180° (d) 45°
The impact parameter for an alpha particle approaching a target nucleus is maximum
when the scattering angle is
(a) 0° (b) 90° (c) 180° (d) 45°
fuEu iz'uksa osQ mÙkj ,d 'kCn@okD; esa fyf[k,µ
Answer the following questions in one word—

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10. ml ifj?kVuk dk uke crkb, tks izdk'k osQ fdlh vojks/d osQ uqdhys dksuksa osQ pkjksa vksj eqM+us osQ fy,

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ftEesnkj gSA

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Name the phenomenon which is responsible for bending of light around sharp corners of

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an obstacle.

s
fo|q r /kjk vfn'k jkf'k gS ;k lfn'k jkf'k\
g l
la
11. 

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Is electric current a scaler quantity or vector quantity?
a
a
→ →
12. ,d vkosf'kr d.k q ij ,d leku pqEcdh; {ks=k B esa osx V ls xfr djus ij yxus okys cy dh fn'kk
D;k gksxhA
→
What is the direction of the force acting on a charged particle q moving with velocity V in

→
a uniform magnetic field B ?

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fjDr LFkkuksa dh iwfrZ djsaµ
Fill in the blanks—
13. ,d p laosx osQ d.k osQ fy, ns&czkWXyh rjax&nSè;Z dk eku -------------------- gksxkA
The De Broglie wavelength associated with a particle of momentum (p) is given by ................ .
14. gkbMªkstu ijek.kq osQ fy, -------------------- Js.kh n`'; izdk'k esa gksrh gS\
.................... series of H-atom lies in visible range?
15. rkieku esa o`f¼ osQ lkFk] ,d /kfRod pkyd esa eqÝr bySdVªkWuksa dk viokg osx .................... tkrk gSA
With an increase in temperature, the drift velocity of free electrons in a metallic conductor
.................... .
iz'u la[;k (16-18) vfHkdFku (A) vkSj dkj.k (R) izdkj osQ iz'u gSaA nks dFku fn, x, gSaµ ftuesa ,d dks
vfHkdFku (A) rFkk nwljs dks dkj.k (R) }kjk vafdr fd;k x;k gSA bu dFkuksa dks è;kuiwoZd if<+, vkSj uhps
fn, x, fodYiksa dks (a), (b), (c) vkSj (d) esa ls mÙkj osQ :i esa fodYi pqfu,µ
(a) vfHkdFku (A) rFkk dkj.k (R) nksuksa lR; gSa rFkk dkj.k (R)] vfHkdFku (A) dh lgh O;k[;k
djrk gSA
(b) vfHkdFku (A) rFkk dkj.k (R) nksuksa lR; gSa ysfdu dkj.k (R)] vfHkdFku (A) dh lgh O;k[;k ugha
djrk gSA
(c) vfHkdFku (A) lR; gS] ysfdu dkj.k (R) vlR; gSA
(d) vfHkdFku (A) rFkk dkj.k (R) nksuksa vlR; gSA
Questions number 16 to 18 are Assertion (A) and Reason (R) type questions. Two statements
are given– one labelled Assertion (A) and the other labelled Reason (R). Read the statements
carefully and choose the correct option from the codes (a), (b), (c) and (d) are given below—
(a) Both Assertion (A) and Reason (R) are true and the Reason (R) is the correct explanation
of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but the Reason (R) is the incorrect
explanation of Assertion (A).
(c) Assertion (R) is true, but Reason (R) is false.
(d) Assertion (R) and Reason (R) both are false.
16. vfHkdFku (A) % ikuh dh lrg ij rsy dh iryh ijrksa esa jax ns[ks tk ldrs gSaA
dkj.k (R) % lisQn izdk'k dbZ jaxksa ls feydj curk gSA
Assertion (A) : Colours can be seen in thin layers of oil on the surface of water.
Reason (R) : White light is composed of several colours.
E
17. vfHkdFku (A) % iQksVksu dh mQtkZ (E) vkSj laosx (p) dk laca/ bl izdkj gS fd p = A
C
dkj.k (R) % iQksVksu ,d d.k dh Hkk¡fr O;ogkj djrk gSA
E
Assertion (A) : The energy (E) and momentum (p) of a photon are related by p = .
C
Reason (R) : The photon behaves like a particle.
18. vfHkdFku (A) % ukfHkdh; fo[kaMu esa mQtkZ eqDr gksrh gSA
dkj.k (R) % fo[kaMu [kaMksa dh oqQy ca/u mQtkZ tud ukfHkd dh oqQy ca/u mQtkZ ls vf/d gksrh gSA
Assertion (A) : Energy is released in nuclear fission.

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Reason (R) : The total binding energy of fission fragments is larger than the total
binding energy of the parent nucleus.

[k.M&c

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section-B

o m (vfry?kq mÙkjh; iz'u)
m .
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19. oS|qr vkos'k dk DokaVehdj.k D;k gS\ LFkwy Lrj ij bldh mis{kk D;ksa dh tkrh gS\

l a a g
g
What is quantisation of charge? Why it is ignored at macroscopic level?


a fdlh fudk; esa nks vkos'k q = 2.5 × 10 C rFkk q = –2.5 × 10 C ozQe'k% nks fcanvq ksa A : (0, 0, –15 cm)
A
OR
–7
B
–7

rFkk B : (0, 0, +15 cm) ij vofLFkr gSaA fudk; dk oqQy vkos'k rFkk oS|qr f}/zqo vk/w.kZ D;k gS\
A system has two charges qA = 2.5 × 10–7 C and qB = –2.5 × 10–7 C located at points A : (0,
0, –15 cm) and B : (0, 0, +15 cm) respectively. What is the total charge and electric dipole
moment of the system.
20. fdj[kf-iQ osQ fu;eksa dk mYys[k dhft,A
State Kirchhoff’s rules.


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OR

m of a heating element is 100 W. What is the
dejsa dk rki (27°C) ij fdlh rkiu&vo;o dk izfrjks/ 100 W gSA ;fn rkiu&vo;o dk izfrjks/ 117 W

e
s is found to be 117 W, given that the temperature
gks rks vo;o dk rki D;k gksxk\ izfrjks/d osQ inkFkZ dk rki&xq.kkad 1.70 × 10–4 °C–1 gSA

l
At room temperature (27°C) the resistance
a
coefficient of the material of the g
a
temperature of the element if the resistance
–4 –1
resistor is 1.70 × 10 °C .
21. vki xSYosuksehVj dks vko';d lhek osQ oksYVehVj esa oSQls cny ldrs gSa\
How can you convert the glavanometer into voltmeter of required range.

22. lw{e rjaxs D;k gS\ bu rjaxksa osQ dksbZ nks mi;ksx fyf[k,A
What are microwaves? Write down any two uses of these waves.

23. ,d oLrq AB dks ,d vory niZ.k osQ lkeus tSlk fd fp=k esa fn[kk;k x;k gS] j[kk x;k gSA

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c. o s e m
s em la
gla ag
a
(i) fdj.k vkjs[k dks iwjk djsa tks oLrq osQ izfrfcac osQ fuekZ.k dks n'kkZrk gSA
;fn niZ.k osQ ijkorZd lrg osQ fupys vk/s fgLls dks dkyk jax fn;k tk, rks izfrfcac dh fLFkfr vkSj
(ii) 
rhozrk oSQls izHkkfor gksxh\

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An object AB is kept in front of a concave mirror as shown in the figure.


(i) Complete the ray diagram showing the image formation of the object.
(ii) How will the position and intensity of the image be affected if the lower half of the
mirror’s reflecting surface is painted black?
vFkok
nar fpfdRld }kjk vkSj dkj osQ i'p n`'; niZ.k (lkbM O;w fejj) osQ :i esa fdl izdkj osQ xksyh; niZ.k
dk mi;ksx fd;k tkrk gS\ vius mÙkj osQ leFkZu esa dkj.k crkb,A
Which type of spherical mirrors are used by the dentist and as side view mirrors in cars?

Give reason to support your answer.
24. fdlh uSu v/Zpkyd ls (d) n&izdkj dk v/Zpkyd] vkSj ([k) p&izdkj dk v/Zpkyd fdl izdkj izkIr
fd;k tkrk gS\ bu izdkjksa osQ izR;sd v/Zpkyd esa cgqla[;d vkos'k okgdksa dk uke fyf[k,A
How are (a) n-type semiconductor, and (b) p-type semiconductor obtained from an intrinsic

semiconductor? Name the majority charge carriers in each of the semiconductors.
25. xkbxj&eklZMu }kjk lksus dh iryh iUuh ij ,sYiQk&d.kksa osQ izdh.kZu iz;ksx dk O;oLFkkRed fu:i.k [khft,A
tc ,sYiQk&d.kksa dh xfrt mQtkZ dks nksxquk fd;k tkrk gS] rc mixeu dh fudVre nwjh oSQls izHkkfor
gksrh gSA
Draw a schematic arrangement of the Geiger-Marsden experiment for studying a-particle

scattering by a thin foil of gold. How will the distance of closest approach be affected when
the kinetic energy of the a-particle is doubled?

[k.M&l
section-C
(y?kq mÙkjh; iz'u)
[Short Answer Type Questions]
uhps fn, x, vkadM+ksa ls fu/kZfjr dhft, fd fuEufyf[kr vfHkfozQ;k m"ek{ksih gS vFkok m"ek'ks"kh gS%
26. (i)
12
C6 + 12C6 → 20Ne10 + 4He2
ijek.kq nzO;eku% m(4He2) = 4.002603 u
m(12C6) = 12.000000 u
20
m( Ne10) = 19.992439 u
30 14
(ii) iQkWLiQksjl P15 vkSj ukbMªkstu ( N7) osQ ukfHkdh; ?kuRoksa dk vuqikr D;k gS\
(i) Determine from the given data, whether the following reaction is exothermic or

endothermic:

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12
C6 + 12C6 → 20Ne10 + 4He2
Atomic masses: m(4He2) = 4.002603 u
m(12C6) = 12.000000 u

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m(20Ne10) = 19.992439 u

om .
(ii) What is the ratio of nuclear density of the phosphrous 30P15 and nitrogen 14N7?

.c e m
s
OR
cksj dk nwlm
Hkoe d{kk esa ifjozQek djrs gq, bysDVªkWu dh oqQy mQtkZ] n osQ O;qRozQekuqikrh gksrh gSA
noha las
jk vfHkxzghr fyf[k,A cksj osQ vfHkxzghrksa osQ mi;ksx }kjk iznf'kZr dhft, fd gkbMªkstu ijek.kq esa
g l a
a
l Bohr’s second postulate. Using Bohr’s postulates show that for an electron revolving a
2

g
a in n possible orbit in a hydrogen atom, the total energy of the electron is inversely
State
th

proportional to n2.
→
27. fdlh izR;korhZ /kjk (ac) tfu=k dk fl¼kUr fyf[k,A ?kw.kZu v{k osQ yEcor~ fnf'kd fdlh pqEcdh; {ks=k E
esa fu;r dks.kh; pky ‘w’ ls ?kw.kZu djus okyh N yisVksa vksj vuqizLFk&dkV {ks=kiQy A dh fdlh oqQ.Myh
esa izsfjr fo+qr&okgd cy (emf) osQ fy, O;atd izkIr dhft,A
State the principle of an (ac) generator. Obtain the expression for the emf induced in a coil

having N turns each of cross sectional area A rotating with a constant angular speed ‘w’ in

m
→

o
a magnetic field B , directed perpendicular to the axis of rotation.

VªkaliQkWeZj fdl fl¼kar ij dk;Z djrk gSA mPpk;h m
OR
. c
s e fdUgha nks dkjdksa dk mYys[k dhft,A
VªkWliQkWeZj vkSj vip;h VªkaliQkeZj esa dksbZ ,d varj fyf[k,A

What is the operating principle g
l a
okLrfod VªkaliQkWeZjksa esa mQtkZ {k; osQ fy, mÙkjnk;h

transformer and step-down transformer. a of transformer. Write any one difference between step-up
Write any two factors which are responsible for
energy losses in actual transformers.
28. izdk'k&fo|qr izHkko D;k gS\ vkifrr fofdj.k dh fofHkUu rhozrkvksa osQ fy, izdkf'kd&/kjk rFkk ifV~Vdk
foHko osQ chp vkys[k [khfp,A iQyr% fujks/h foHko dks ifjHkkf"kr dhft,A
What is photoelectric effect? Plot the variation of photocurrent with collector plate potential

for different intensity of incident radiation. Hence define stopping potential.
29. izdk'k osQ iw.kZ vkUrfjd ijkorZu ls D;k rkRi;Z gS\ iw.kZ vkUrfjd ijkorZu osQ fy, nks vko';d 'krs±
(i)

m
c. o
fyf[k,A

m
c. o m conditions
(ii) ml ekè;e esa izdk'k dh pky ifjdfyr dhft, ftlosQ fy, ok;q osQ lkis{k ozQkafrd dks.k dk eku
45° gSA
s e
s em l a
(i) What is meant by total internal reflection of light? Write the two necessary

la
for total internal reflection to occur?
g
a angle with respect to
ag
(ii) Calculate the speed of light in a medium for which the critical
air is 45°.
30. fdlh P – n laf/ Mk;ksM dk vxzfnf'kd ck;l esa V – I vfHkyk{kf.kd osQ vè;;u osQ iz;ksfxd ifjiFk
O;oLFkk cukb,A V – I vfHkyk{kf.kd dk iz;ksx djrs gq, Mk;ksM dh nsgyh oksYVrk ;k dV bu oksYVrk dks
ifjHkkf"kr dhft,A
Draw experimental circuit arrangement for studying V – I characteristics of a P – n junction

diode in forward bias. Define threshold voltage or cut-in voltage of diode by using V – I
characteristics.
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[k.M&n
section-D
(osQl LVMh vk/kfjr iz'u)
[Case Study Based Questions]
31. fo|qr /kjk dks ,dkad le; esa fdlh fo'ks"k {ks=k ls izokfgr vkos'k osQ ifjek.k }kjk O;Dr fd;k gSA nwljs
'kCnksa esa] fo|qr vkos'k osQ izokg dh nj dks fo|qr /kjk dgrs gSA ifjikVh osQ vuqlkj fdlh fo|qr ifjiFk esa
bysDVªkWuksa dk tks ½.kkos'k gSa] osQ izokg dh fn'kk osQ foijhr fn'kk dks fo|qr /kjk dh fn'kk ekuk tkrk gSA
;g ik;k x;k fd tc rkj dh yackbZ nksxquh dj nsrs gSA rks ,sehVj dk ikB~;kad vk/k gks tkrk gSA ifjiFk esa
leku inkFkZ rFkk leku yackbZ dk eksVk rkj tksM+us ij ,sehVj dk ikB~;kakd c< tkrk gSA ,sehVj osQ ikB~;kad
esa rc Hkh varj vkrk gS tc ifjiFk esa fHkUu inkFkZ ijarq leku yackbZ rFkk leku vuqizLFk dkV osQ {ks=kiQy
osQ rkj dks tksM+rs gSaA
(i) fuEufyf[kr esa ls fdl laca/ dks /kjk ?kuRo dgk tkrk gS\
I A I2 I3
(a) (b) (c) (d)
A I A A2
nl leku rkj] ftuesa ls izR;sd dk izfrjks/ 1 W gS] lekarj ozQe esa tksM+s tkrs gSaA bl la;kstu dk
(ii) 
izfrjks/ gksxk%
(a) 10 W (b) 1 W (c) 0.1 W (d) 0
(iii) izfrjks/drk (;k fof'k"V izfrjks/) dk foeh; lw=k gS%
(a) [ML2 T–2 A–1] (b) [ML3 T–3 A–3] (c) [ML3 T–2 A–1] (d) [ML2 T–2 A–2]
OR
vko`Qfr esa fn[kk, x, I vkSj V osQ xzkiQ esa] ½.kkRed izfrjks/ osQ laxr {ks=k dh igpku djsa%

(a) AB (b) BC (c) CD (d) DE
(iv) ,d lsy osQ vkarfjd izfrjks/ dk lw=k fyf[k,A
Electric current is expressed by the amount of charge flowing through a particular area
in unit time. In other words, it is the rate of flow of electric charges. Conventionally, in an
electric circuit the direction of electric current is taken as opposite to the direction of the
flow of electrons, which are negative charges.
It is observed that the ammeter reading decreases to one-half when the length of the wire
is doubled. The ammeter reading is increased when a thicker wire of the same material and
of the same length is used in a circuit. A change in the ammeter reading is observed when
a wire of different material of the same length and the same area of cross-section is used
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co m .
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as ag

(i) Which of the following relations is called as current density?
I A I2 I3
(a) (b) (c) (d)
A I A A2

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co
(ii) Ten identical wires each having a resistance of 1 ohm are connected in parallel. The

(a) 10 Wom .
combination will have a resistance of

. c of resistivity (or specific resistance) is e m
s
(b) 1 W (c) 0.1 W (d) 0

s em[ML T A ] (b) [ML T A ] (c) [ML T A ] (d) [ML T A ] gla
(iii) Dimensions

la the graph between I and V asOR a
2 –2 –1 3 –3 –3 3 –2 –1 2 –2 –2
(a)

g
a to negative resistance.
From shown in figure, identify the portion corresponding

m
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s em
g l a
a
(a) AB (b) BC (c) CD (d) DE
(iv) Write formula for the internal resistance of a cell.
32. fdlh izfrjks/d esa izokfgr gksus okyh /kjk rFkk ac oksYVrk leku dyk es jgrs gSaA ijarq izsjd] la/kfj=k vFkok
buosQ la;kstu ;qDr ifjiFkksa esa ,slk ugha gksrk gSA ac ifjiFk esa /kjk o oksYVrk osQ chp okyk laca/ n'kkZus osQ
fy, ge isQtlZ dh /kj.kk dk mi;ksx djrs gSaA isQtj fp=k osQ mi;ksx ls ac ifjiFk dk fo'ys"k.k ljyrkiwoZd
gks tkrk gSA isQtj ,d lfn'k gS tks ewy fcanq osQ ifjr% dks.kh; osx w ls ?kw.kZu djrk gSA isQtlZ V ,oa I osQ
mèokZ/j ?kVd T;koozQh; :i ls ifjorZu'khy jkf'k;k¡ v ,oa i fu#ifr djrs gSaA isQtlZ V and I osQ ifjek.k
bu nksyk;eku jkf'k;ksa osQ vk;ke vFkok f'k[kjeku vm ,oa im fu#fir djrs gSaA oksYVrk ,oa /kjk osQ mèokZ/j

m
v{k ij iz{ksi vFkkZr vm sin wt ,oa im sin wt ozQe'k%] ml {k.k fo'ks"k ij oksYVrk ,oa /kjk osQ eku fu:fir

m c. o
djrs gSaA

c. o m
(i) 220 V ac dk f'k[kj eku gSµ

s e
em la
(a) 220 V (b) 311 V (c) 110 V (d) 440 V

las ag
(ii) ,d 'kq¼ izsjdh; ifjiFk esa 'kfDr {k; gksrh gS%

g
(a) I2 R (b) IR 'kwU;
(c) (d) dksbZ ugha

a fdlh ac Ïksr dks izfrjks/d ls tksM+k x;k gSA blesa cgus okyh /kjk o iz;qDr oksYVrk osQ chp dkykarj
(iii) 
gksrk gS%
(a) 0°C (b) 45° (c) 90° (d) 180°
(iv) la/kfj=kh; izfr?kkr (XC) dk vko`fr (f ) osQ lkFk ifjorZu dk xzkiQ cukb,A
OR

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,d 14 mH dh oqaQMyh esa 100 HZ izR;korhZ /kjk (ac) izokfgr gks jgh gSA bldk izfr?kkr Kkr dhft,A
Current through a resistor is in phase with the ac voltage. But this is not so in the case of

a inductor, a capacitor or a combination of these circuit elements. In order to show phase
relationship between voltage and current in an ac circuit, we use the notion of phasors. The
analysis of an ac circuit is facilitated by the use of a phasor diagram. A phasor is a vector
which rotates about the origin with angular speed omega. The vertical components of
phasors V and I represent the sinusoidally varying quantities v and i. The magnitude of
phasors V and I represent the amplitude or the peak values vm and im of these oscillating
quantities. The projection of voltage and current phasors on vertical axis i.e., vm sin wt and
im sin wt, respectively represent the value of voltage and current at that instant.
(i) The peak value of 220 V a.c. is:
(a) 220 V (b) 311 V (c) 110 V (d) 440 V
(ii) The power dissipated in a pure inductive circuit is:
(a) I2 R (b) IR (c) Zero (d) None of these
(iii) An ac source is connected to a resistor. The phase difference between applied voltage
and the current flowing through it is:
(a) 0° (b) 45° (c) 90° (d) 180°
(iv) Draw the variation of capacitive reactance (XC) with frequency (f).
OR
A 100 Hz a.c. is flowing in a 14 mH coil. Find its reactance.

[k.M&;
section-E
(nh?kZ mÙkjh; iz'u)
[Long Answer Type Questions]
33. fdlh ekè;e dk ^ijkoS|qrkad* ifjHkkf"kr dhft,A tc fdlh la/kfj=k dh ifV~Vdkvksa osQ chp dksbZ ijkoS|qr
inkFkZ iw.kZr% Hkj fn;k tkrk gS] rks mldh /kfjrk osQ fy, O;atd O;qRiUu djsaA
Define ‘dielectric constant’ of a medium. Derive expression for capacitance of a parallel

plate capacitor when the dielectric id inserted fully between its plates.
OR
(i) fLFkj oS|qfrdh esa xkmQl dk fu;e crkb,A
(ii) lefoHko i`"B ij fdlh ijh{k.k vkos'k dks foLFkkfir djus esa fd;k x;k dk;Z 'kwU; gksrk gSA D;ksa\
(iii) oS|qr f}/zqo dh v{kh; js[kk ij fdlh fcanq ij oS|qr {ks=k dh rhozrk osQ O;atd dh O;qRifRr djsa\
(i) Define Gauss’s law in electrostatics
(ii) No work is done in moving a test charge on an equipotential surface. Why?
(iii) Derive expression for electric field intensity at a point on axial line of an electric
dipole.
34. ,d lh/h pkyd NM+ ftldh yackbZ l gS] blesa I /kjk izokfgr gks jgh gS] vkSj mls ,dleku pqach;
(i)
{ks=k B esa j[kk x;k gS] ij yxus okyk vf/dre paqcdh; cy osQ O;atd dh O;qRifRr dhft,A
(ii) izfrpqach; vkSj vuqpaqcdh; inkFkks± esa dksbZ nks varj crkb,A
(i) Derive an expression for the maximum magnetic force experienced by a straight
conductor of length l, carrying current I and kept in a uniform magnetic field B.
(ii) Write any two differences between diamagnetic and paramagnetic substances.

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as ag

OR
,dleku pacdh; {ks=k esa vk;rdkj fo|qr /kjk ik'k ij cy vk?kw.kZ osQ fy, O;atd dh O;qRifÙk dhft,A
Derive an expression for torque acting on a rectangular current loop placed in a uniform


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magnetic field.

om .
izdk'k osQ LFkk;h O;frdj.k osQ fy, eq[; 'krs± D;k gS\
c m
35. (i)

m .
(ii) ;ax osQ f}&f>jh iz;ksx esa laiks"kh vkSj fouk'kh O;frdj.k dh 'krks± dh vfHkO;fDr izkIr djsaA
se

s e
(i) What is the main condition for sustained interference of light.

g l a
l a
(ii) Obtain the condition for constructive and destructive interference in Young’s double
a
ag
slit experiment.
OR
n1 n2 n  n1
fl¼ djs
= 2 ] tc ,d mÙky xksyh; i`"B viorZd lrg ij fojy ls l?ku ekè;e esa
u v R
viorZu gksrk gSA
n1 n2 n  n1
Prove that

= 2 , when refraction occurs from rarer to denser medium at a
u v R
convex spherical refracting surface.

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a

m
m c. o
c. o s e m
s em la
gla ag
a

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