CG Board 12th Sample Paper Physics

छत्तीसगढ़ माध्यमिक
शिक्षा मण्डल

Model Paper

CGBSE Sample Paper
(Practice Paper)

CGBSE Model Paper
-- AGLASEM --

a Class -12th
fo"k;& HkkSfrd “kkL= ¼201½
Subject - Physics (201)

le;% 03 ?k.Vs iw.kkZd
a & 70
Time: 03 hours Max Marks-70

funsZ”k %
1- ç'u la[;k 1 ,d oLrqfu"B çdkj dk ç'u gksxk] ftlesa nks [kaM gksaxs :-
i) [kaM "A" esa 10 cgqfodYih; ç'u ¼MCQ½ gksx
a sA çR;sd ç'u 01 vad dk gksxkA
ii) [kaM "B" esa 05 cgqr NksVs mÙkj okys ç'u ¼,d 'kCn@okDl esa mÙkj½ gksaxAs çR;sd ç'u 01 vad dk
gksxkA
2- ç'u la[;k 2 ls ç'u la[;k 8 rd y?kq mÙkjh; çdkj&¼SA-I½ ç'u gksaxAs çR;sd ç'u 02 vadksa dk gksxkA 30
'kCnksa dh lhekA
3- ç'u la[;k 9 ls ç'u la[;k 14 rd y?kq mÙkjh; çdkj&¼SA-II½ ç'u gksx
a sA çR;sd ç'u 03 vadksa dk gksxkA
50 'kCnksa dh lhekA
4- ç'u la[;k 15 ls ç'u la[;k 16 rd nh?kZ mÙkjh; çdkj &¼LA-I½ ç'u gksx
a As çR;sd ç'u 04 vadksa dk
gksxkA 75&100 'kCnksa dh lhekA
5- ç'u la[;k 17 ls ç'u la[;k 19 rd nh?kZ mÙkjh; çdkj &¼LA-II½ ç'u gksaxAs çR;sd ç'u 05 vadksa dk
gksxkA 100&150 'kCnksa dh lhekA
6- uksV & –f"Vckf/kr Nk=ksa ds fy, vkjs[k@fp= ds LFkku ij lS)kafrd ç'u fn, tk,axAs

Instructions:
1. Question No. 1 is an objective type question which will have two sections :-
(i) Section "A" will have 10 Multiple Choice (MCQ) questions. Each carries 01 mark.
(ii) Section "B" will have 05 very short answer questions (answer in one word) .Each carries 01 mark.
2. Question No. 2 to Question No. 8 will be short answer type-I (SA-I) questions. Each carries 02 marks.
30 words limit.
3. Question No. 9 to Question No. 14 will be short answer type-II (SA-II) questions. Each carries 03
marks. 50 words limit.
4. Question No. 15 to Question No. 16 will be long answer type (LA-I) questions. Each carries 04 marks.
75-100 words limit.
5. Question No. 17 to Question No. 19 will be long answer type (LA-II) questions. Each carries 05
marks. 100-150 words limit.
Tip - For visually impaired students, theoretical questions will be given in place of drawing/chart.

[k.M ^^v**
Section "A"
Hkkx&1 cgqfodYih; iz”u
Part- 1 Multiple Choice Questions

iz”u 01 ¼v½ % lgh fodYi pqudj fyf[k, %& (10)
Choose and write the correct option:

1- fuEu esa ls fdl HkkSfrd jkf”k dk S.I. ek=d U;wVu@dwykWe gksrk gS & (1)
(a) fo|qr foHko (b)fo|qr ¶yDl (c) fo|qr {ks= dh rhozrk (d)foHkokUrj
Which of the following physical quantity has S.I. unit Newton/Coulomb?
(a) Electric potential (b) Electric flux (c) Electric field intensity (d) Potential difference

2- dFku (A): ,d pkyd dk izfrjks/k mldh yackbZ es oa `f) ds lkFk c<rk gSA (1)
dkj.k (R): izfrjks/k pkyd ds yackbZ ds vuqdzekuqikrh gksrk gSA
fuEu esa ls dkSu lk dFku lgh gS&
(a) A vkSj R nksuks lR; gS vkSj R, A dh O;k[;k djrk gSA
(b) A vkSj R nksuks lR; gS vkSj R, A dh O;k[;k ugh djrk gSA
(c) A lR; gS ysfdu R vlR; gSA
(d) A vlR; gS ysfdu R lR; gSA
Assertion (A)- The resistance of a conductor increases with an increase in its length.
Reason (R)- Resistance is directly proportional to the length of conductor.
Which of the following is correct?
(a) Both A and R are true and R explains A.
(b) Both A and R are true but R doesn’t explains A.
(c) A is true but R is false.
(d) A is false but R is true.

3- vehVj dk izfrjks/k S, oksYVehVj dk izfrjks/k R rFkk /kkjkekih dk izfrjks/k G gS rks blesa laca/k
gS & (1)
(a) R > G > S (b)G > R > S (c) S > R > G (d)S > G > R
The resistance of an ammeter is S, the resistance of a voltmeter is R and the resistance of
a galvanometer is G, then the relation between them is:
(a) R > G > S (b) G > R > S (c) S > R > G (d) S > G > R

4- E = 100 sin 314t okys izR;korhZ foHko lzkrs dk vko`fÙk gS & (1)
(a) 314 Hz (b)100 Hz (c) 50 Hz (d)60 Hz
The frequency of an alternating voltage source E = 100 sin 314t is:
(a) 314 Hz (b) 100 Hz (c) 50 Hz (d) 60 Hz

5- 4000 Å ls 7000Å rjaxnS/;Z okys fo|qr pqEcdh; rjax gS & (1)

(a) γ-fdj.ksa (b) x -fdj.ksa (c) ijkcSaxuh fdj.ksa (d) n`’; fdj.ksa
Electromagnetic waves with wavelengths from 4000 Å to 7000 Å is -
(a) γ – ray (b) X – ray (c) ultra violet ray (d) visible ray

6- 10cm Qksdl nwjh o -15cm okys Qksdl nwjh ds la;kstu ls cuus okyk ysl
a gksxk& (1)
(a) vory ysl
a (b) mÙky ySal (c) leryksÙky ysl a (d) lerykory ysl a
The lens formed by the combination of lenses with focal length of 10cm and -15cm will
be:
(a) Concave lens (b) Convex lens (c) Plano-convex lens (d) Plano-concave lens

7- lkcqu dk cqycqyk jaxhu fn[krk gS & (1)
(a) O;frdj.k (b) foorZu (c) /kqzo.k (d) viorZu
A soap bubble appears colored due to-
(a) Interference (b) Diffraction (c) Polarization (d) Refraction

8- izdk'k fo|qr /kkjk c<+sxh & (1)
(a) vkifrr izdk'k dh rhozrk c<+kus ij
(b) vkifrr izdk'k dh rhozrk ?kVkus ij
(c) vkifrr izdk'k dh vko`fÙk c<+kus ij
(d) vkifrr izdk'k dh vko`fÙk ?kVkus ij
The photoelectric current will increase:
(a) By increasing the intensity of incident light
(b) By decreasing the intensity of incident light
(c) By increasing the frequency of incident light
(d) By decreasing the frequency of incident light

9- 92U238 esa U;wVªkWu dh la[;k gksxh & (1)
(a) 92 (b) 238 (c) 146 (d) 330
The number of neutrons in 92U238 will be-
(a) 92 (b) 238 (c) 146 (d) 330

10- N- izdkj ds v/kZpkyd esa cgqla[;d vkos'k okgd gS & (1)
(a) fooj (b) bysDVªkWu (c) α-d.k (d) β-fdj.ksa
Majority charge carriers in an N-type semiconductor is:
(a) Holes (b) Electrons (c) α-particles (d) β-particle

[k.M ^^c**
Section "B"

iz'u 01 ¼c½ % ,d 'kCn@,d okD; esa mÙkj fyf[k,A (05)
Write answer in one word/one sentence

(i) 5µf ds nks la/kkfj= lekarj Øe esa tqM+s gSA ifj.kkeh /kkfjrk Kkr dhft,\ (1)
Two capacitors of 5µF are connected in parallel. Calculate the resultant capacitance?

(ii) nks ykSg pqacdh; inkFkksZ ds uke fyf[k,A (1)
Write name of two ferromagnetic substances.

(iii) yst
a dk fu;e fdl laj{k.k fu;e ij vk/kkfjr gSA (1)
Lenz's law is based on which conservation law?

(iv) izdk'k ds foorZu dks ikfjHkkf"kr dhft,A (1)
Define Diffraction of light.

(v) rki o`f) ds lkFk v)Zpkyd dh pkydrk ij D;k izHkko iM+sxkA (1)
What will be the effect on the conductivity of the semiconductor with increase in
temperature?

iz”u 2 % fo|qr ifjiFk laca/kh fdjpkWQ dk fu;e fyf[k,A (1+1)
Write Kirchhoff's electrical circuital laws.

iz”u 3 % pqca dh; izo`fÙk dks ifjHkkf"kr dhft,A (2)
Define magnetic susceptibility.

iz”u 4 % ,d leku pqacdh; {ks= B esa yacor~ xfreku izksVªkWu] bysDVªkWu o U;wVªkWu ,d leku osx V
ls gSA mlesa fdl ij cy vf/kdre yxsxkA (2)
A proton, electron, and neutron are moving with equal velocity V in a
perpendicular uniform magnetic field B. For which particle force will be
maximum?

iz”u 5 % ,d dqMa yh ls c) pqacdh; ¶yDl Ǿ = 6t2 – 7t + 6 feyh oscj gS rks t=2 lsdMa ij
mRiUu izsfjr fo?kqr okgd cy Kkr dhft,A (1+1)
Magnetic flux linked with a coil is Ǿ = 6t² – 7t + 6 milli Web. Calculate induced
electromotive force at t=2 seconds.

iz”u 6 % ,d mÙky ysal dk viorZukad µ1 gSA bls leku viorZukad µ1 okys æo esa Mqckus ij ysal
fdl rjg O;ogkj djsxkA mldh Qksdl nwjh fdruh gks tk;sxhA (1+1)
Refractive index of a convex lens is µ1. What will be the focal length and behavior
of lens when it is immersed in a liquid of same refractive index µ1?

iz”u 7 % ,d ijek.kq dk bysDVªkWu nwljh mPpre d{kk ls igyh d{kk esa laØfer gksrk gS rks og
fdl jax ds izdk'k dk mRltZu djsxkA LisDVªeh js[kk Js.kh dk uke fyf[k,A (1+1)
Which color of light will be emitted when an electron of an atom transits from
second highest orbit to first orbit? Name the spectral series.

iz”u 8 % p-n laf/k Mk;ksM esa i'p vfHkufr n'kk esa fuEufyf[kr ij D;k izHkko iM+sxk & (1+1)
(a) vo{k; ijr dh eksVkbZ
(b) Mk;ksM ds izfrjks/k ij
What will be the effect of reverse biased p-n junction diode on the-
(a) Thickness of the depletion layer
(b) Resistance of the diode
iz”u 9 % foHko izo.krk D;k gS\ mldk S.I. ek=d fy[kdj foeh; lw= fyf[k,A (1+1+1)
What is potential gradient? Write its S.I. unit and dimensional formula.

iz”u 10 % nks izkFkfed lsyksa ds lekarj Øe la;kstu gsrq ifj.kkeh fo|qr okgd cy dk O;atd
fuxfer dhft,A (1+2)
Derive an expression of resultant electromotive force for the parallel combination of
two primary cells.

iz”u 11 % xkek rjax D;k gS\ blds nks izeq[k mi;ksx fyf[k,A (1+2)
What are Gamma rays? Write its two uses.

iz”u 12 % fuEu dks ikfjHkkf’kr dhft, & fujks/kh foHko] QksVkWu] izdk'k fo|qr izHkko (1+1+1)
Define the following: Stopping potential, Photon, Photoelectric effect

iz”u 13 % cksj ijek.kq ekWMy ds egRoiw.kZ fu"d"kZ fyf[k,A (3)
Write important conclusion of Bohr’s atomic model.

iz”u 14 % p-n laf/k Mk;ksM dk iw.kZ rjax fn"Vdkjh ifjiFk cukus gsrq vkidks fuEu midj.k fn, x,
gS] muds la;kstu ls ifjiFk cukdj fuos”kh o fuxZr foHko dk xzkQ [khfp,A (1+2)
(a) izR;korhZ foHko lzkr
s
(b) Vªkla QkeZj
(c) Mk;ksM
(d) dqta h
(e) ckg~; izfrjks/k

Draw full wave rectifier circuit diagram for a p-n junction diode using following
components and also plot graph between input and output voltage.
(a) Alternating voltage source
(b) Transformer
(c) Diode
(d) Key
(e) External resistance

iz”u 15 % v:.k vius nksLrksa ds lkFk Vgyus x;k FkkA ogk¡ ls ,d Vªd xqtjh ftlesa fy[kk Fkk &
^^lko/kku foLQksVd lkexzhA** Vªd ls ,d tathj ca/kh Fkh] tks tehu dks Li”kZ dj jgh FkhA
v:.k us vius nksLrksa dks le>k;k fd Vªd dh xfr ds nkSjku mldh /kqjh i`Foh ds pqca dh;
{ks= js[kkvksa dks dkVrh gS] QyLo:i mlds fljksa ij fo|qr okgd cy izfs jr gks tkrk gSA
izsfjr vkos”k dk tathj ds }kjk {kj.k gksrk jgrk gSA ftlls foLQksVd inkFkZ lqjf{kr cus
jgrs gSA
fuEu iz”uksa ds mÙkj nhft, & (1+1+2)
(i) v:.k us fdu ewY;ksa dk izn”kZu fd;k\
(ii) izsfjr fo|qr okgd cy dc mRiUu gksrk gS\
(iii) izsfjr /kkjk dh fn”kk crkus okys fu;e dk uke ,oa dFku fyf[k,A

Arun went for a walk with his friends. A truck passed by there in which it was
written: "Caution: Explosive Material." A chain was attached to the truck, touching
the ground. Arun explained that during the movement of truck, its axle intersects
Earth magnetic lines of field, resulting in an electromotive force being induced at its
ends. The induced charge is continuously earthened through the chain, thus keeping
the explosive material safe.
Answer the following questions:
(i) What values Arun demonstrated?
(ii) When induced electromotive force is produced?
(iii) Name and write statement of the rule which describes the direction of induced
current.

vFkok OR

/khjt ds fo|ky; ds f”k{kd] fo|kfFkZ;ksa dks “kSf{kd Hkze.k gsrq ikWoj IykaV ij ys x;sA f”k{kd
us crk;k fd izR;korhZ /kkjk ds :i esa fo|qr ÅtkZ dk izs"k.k yach nwfj;ksa rd “kgjksa esa fd;k
tkrk gSA blds fy, Vªkl a QkeZj dk mi;ksx fd;k tkrk gSA /khjt us f”k{kd dh ckrksa dks
/;kuiwoZd lquk vkSj VªkalQkeZj ds fo’k; esa muls iz”u iwNs & (1+1+2)
(i) Vªkl a QkeZj fdl fl)kar ij dk;Z djrk gS\
(ii) mPpk;h vkSj vipk;h VªkalQkeZj esa varj fyf[k,A
(iii) /khjt rFkk f”k{kd egksn; }kjk iznf”kZr ewY; fyf[k,A

Dhiraj's school teacher went to an educational trip to a power plant with students.
The teacher explained that electrical energy is transmitted over long distances to
cities in the form of alternating current. Transformer used for this purpose. Dhiraj
listened carefully to the teacher and asked about transformer.
(i) What is working principle of transformer?
(ii) Write difference between step-up and step-down transformer.
(iii) Write values displayed by Dhiraj and the teacher.

iz”u 16 % leku Qksdl nwjh okys ,d mÙky ysal o ,d vory ysal dk la;kstu fd;k tkrk gSA
bldh lgk;rk gks vuar esa j[ks oLrq dk izfrfcEc cuuk fdj.k vkjs[k }kjk iznf”kZr dhft,
rFkk crkb, fd la;qDr ysl
a dk O;ogkj fdl izdkj gksxk o Qksdl nwjh dk eku fyf[k,A
A convex lens and a concave lens of equal focal length are combined. Write value of
focal length and nature of combined lens system. Also draw the ray digram for an
object placed at infinite. (1+2+1)

vFkok OR

,d niZ.k }kjk fdlh oLrq dk izfrfcEc lnSo oLrq ls NksVk o lh/kk cuk;k tkrk gS] bl
niZ.k dk uke fyf[k, rFkk fdj.k vkjs[k [khaprs gq, crkb, fd niZ.k ds Qksdl nwjh ij D;k
izHkko iM+x
s k ;fn mls fdlh æo esa Mqck fn;k tk;sA (1+2+1)
A mirror always forms a smaller and erect image of an object. Write the name of
mirror and draw a ray diagram for image formation. Explain what will be the effect
on the focal length of the mirror if it is immersed in a liquid.

iz”u 17 % oS|qr f}/kqzo fdls dgrs gS\ bldk S.I. ek=d fyf[k,A fdlh fo|qr f}/kqzo ds v{kh;
fLFkfr esa d nwjh ij fLFkr fdlh fcUnq ij fo|qr {ks= dh rhozrk ds fy, O;atd Kkr
dhft,\ (1+1+3)
What is electric dipole? Write its S.I unit. Derive an expression for electric field
intensity at a distance‘d’ from the middle point of a dipole in axial position.

vFkok OR
la/kkfj= fdls dgrs gS\ lekarj IysV la/kkfj= dh /kkfjrk ds fy, O;atd Kkr dhft, rFkk
bldk ,d mi;ksx fyf[k,A (1+3+1)
What is capacitor? Derive an expression for the capacitance of a parallel plate
capacitor and write its one use.
iz”u 18 % ck;ks&lsoVZ dk fu;e fyf[k,\ rFkk bldh lgk;rk ls lS)kafrd fp= cukrs gq, /kkjkokgh
o`Ùkh; dq.Myh ds v{k ij pqca dh; {ks= dh rhozrk gsrq O;atd izkIr dhft,A (1+4)
Write Biot-Savart's law. Using this law obtain an expression for magnetic field
intensity on the axis of a current-carrying circular coil.

vFkok OR

,sfEi;j dk ifjiFkh; fu;e fyf[k,\ bldh lgk;rk ls lS)kafrd fp= cukrs gq, /kkjkokgh
ifjufydk ds vanj pqacdh; {ks= dh rhozrk gsrq O;atd izkIr dhft,A (1+4)
Write Ampere's circuital law. Using this law obtain an expression for magnetic field
intensity inside the current-carrying solenoid.

iz”u 19 % la;qDr lw{en”khZ dk fdj.k vkjs[k [khapdj mldh vko/kZu {kerk gsrq O;atd Kkr dhft,]
tcfd & (1+2+2)
(i) vafre izfrfcac Li"V n`f"V dh U;wure nwjh ij cus
(ii) vafre izfrfcac vuar ij cus
Draw ray diagram of compound microscope and obtain an expression for its
magnifying power -
(i) Final image is formed at least distance of distinct vision.
(ii) Final image is formed at infinity.

vFkok OR

fizTe ls viorZu dk ukekafdr js[kkfp= cukrs gq, (1+2+2)
(i) fizTe ds inkFkZ ds viorZukad ds fy;s O;atd fuxfer dhft, tgk¡

ladsrksa ds lkekU; vFkZ gSA
(ii) bldh lgk;rk ls irys fizTe ds fy;s U;wure fopyu dks.k dh x.kuk dhft,A

Draw ray diagram of refraction through a prism, and
(i) Obtain expression for refractive index of the material of the prism

where the symbols have their usual meanings.
(ii) Calculate minimum deviation angle for a thin prism using above formula.

&&&000&&&

AglaSem Earn While You Learn Program!

Share your recent question papers with us and get paid!
अपने हाल के न प हम भेज और कमाएँ!

To participate, email us with the following details:
भाग लेने के लए हम न न ववरण के साथ ईमेल कर:

- Your Name
- Your Class
- Your Board
- Details of the Question Papers you have
आपके पास उपल ध न प का ववरण

Our team will reach out to you with the next steps.
हमार ट म आगे क या के लए आपसे संपक करे गी।

Email: support@

Study Materials
Notes

Model Papers Class 6 Notes

Sample Papers Class 7 Notes
Half Yearly Sample Papers Class 8 Notes

Class 9 Notes
Important Resources
Class 10 Notes
Periodic Table
Class 11 Notes
Writing Skills / Formats

Maps of India / World Class 12 Notes

Books and Solutions

NCERT Books
NCERT Book Solutions
HC Verma Chapter Wise Solutions
RD Sharma Solutions
CGBSE Solutions