HBSE Class 12 Physics Question Paper 2018 Set C

CLASS : 12th (Sr. Secondary) Code No. 3628
Series : SS-M/2018

Roll No. SET : C

HkkSfrd foKku
PHYSICS
[ Hindi and English Medium ]
ACADEMIC/OPEN
(Only for Fresh/Re-appear Candidates)
Time allowed : 3 hours ] [ Maximum Marks : 60
• Ñi;k tk¡p dj ysa fd bl iz'u&i= esa eqfnzr iz'u 18 gSaA
Please make sure that the printed question paper are contains 18
questions.
• 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
3628/(Set : C) P. T. O.

(2) 3628/(Set : C)
• 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 %
(i) ç'u-i= esa dqy 18 ç'u gSAa
(ii) lHkh ç'u vfuok;Z gSAa
(iii) ç'u la[;k 1 esa 1-1 vadksa ds ckjg (i-xii) cgqfodYih; ç'u gSAa çR;sd ç'u ds pkj laHkkfor
mÙkj gSA vkidks blesa ls loksZÙke mÙkj pquuk gS vkSj ml mÙkj dks viuh mÙkj&iqfLrdk esa
fy[kuk gSA
(iv) ç'u la[;k 2 ls 10 rd vfry?kq mÙkjh; ç'u gSa rFkk çR;sd ç'u 2 vadksa dk gSA
(v) ç'u la[;k 11 ls 15 rd y?kq mÙkjh; ç'u gSa rFkk çR;sd ç'u 3 vadksa dk gSA

(vi) ç'u la[;k 16 ls 18 rd nh?kZ mÙkjh; ç'u gSa rFkk çR;sd ç'u 5 vadksa dk gSA
(vii) ç'u-i= esa lexz :i ls dksbZ fodYi ugha gSA rFkkfi 5 vadksa okys rhuksa 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
(viii)dSYD;qysVj ds mi;ksx dh vuqefr ugha gSA vko';d gksus ij] y?kqx.kdh; lkjf.k;ksa dk ç;ksx
fd;k tk ldrk gSA
(ix) tgk¡ vko';d gks vki fuEufyf[kr HkkSfrd fu;rkadksa ds ekuksa dk mi;ksx dj ldrs gSa %
c = 3 × 10 8 m/s µ 0 = 4π × 10 −7 Tm A −1
1
h = 6.63 × 10 −34 JS = 9 × 10 9 Nm2C − 2
4π ∈0
e = 1.6 × 10 −19 C me = 9.1 × 10 −31 kg
General Instructions :
(i) There are 18 questions in all.
(ii) All questions are compulsory.
(iii) Question number 1 consists of twelve (i-xii) multiple choice type
questions each of 1 mark. Each question has four possible answers.

3628/(Set : C)

(3) 3628/(Set : C)
You have to select best answers out of these and write in your
answer-sheet.
(iv) Question Numbers 2 to 10 are very short answer type questions and
carry 2 marks each.
(v) Question Numbers 11 to 15 are short answer type questions and
carry 3 marks each.
(vi) Question Numbers 16 to 18 are long answer type questions and
carry 5 marks each.
(vii) There is no overall choice. However, an internal choice has been
provided in all three questions of 5 marks each. You have to attempt
only one of the given choice in such questions.
(viii)Use of Calculators is not permitted, if required you may use
logarithmic tables.
(ix) You may use the following values of physical constants whenever
necessary :
c = 3 × 10 8 m/s µ 0 = 4π × 10 −7 Tm A −1
1
h = 6.63 × 10 −34 JS = 9 × 10 9 Nm2C − 2
4π ∈0

e = 1.6 × 10 −19 C me = 9.1 × 10 −31 kg

[ cgqfodYih; iz'u ]
[ Multiple Choice Type Questions ]

1. (i) ,d U;wVªkWu ij vkos'k gksrk gS % 1

(A) 0 C (B) 1.6 × 10 −19 C

(C) − 1.6 × 10 −19 C (D) 1 C

The charge on a neutron is :

(A) 0 C (B) 1.6 × 10 −19 C

3628/(Set : C) P. T. O.

(4) 3628/(Set : C)
−19
(C) − 1.6 × 10 C (D) 1 C

(ii) nks vkosf'kr d.kksa ds chp dh nwjh ,d-frgkbZ djus ij muds chp cy gks tkrk gS % 1

(A) ,d-frgkbZ (B) vk/kk

(C) ,d-pkSFkkbZ (D) ukS xquk

When the distance between two charged particles is made one-
third, the force between them becomes :

(A) one-third (B) half

(C) one-fourth (D) nine times

(iii) rkieku esa o`f) ls fdlh pkyd ds bysDVªkWuksa dh xfr'khyrk %

1

(A) c<+rh gS
(B) de gksrh gS
(C) c<+ ldrh gS ;k de gks ldrh gS
(D) dksbZ cnyko ugha gksrk
With increase in temperature, the mobility of electrons in a
conductor :
(A) increases
(B) decreases
(C) may increase or decrease
(D) does not change

(iv) 3 kΩ ds çfrjks/kd ds fljksa ij 6V foHkokUrj yxk gks] rks blesa fdruh fo|qr~ /kkjk cg
jgh gS \ 1

(A) 2 µA (B) 2 mA
3628/(Set : C)

(5) 3628/(Set : C)
(C) 2 A (D) 6 A

How much current is flowing through a 3 kΩ resistor when a
potential difference of 6V is applied across its ends ?

(A) 2 µA (B) 2 mA

(C) 2 A (D) 6 A

(v) fdlh fo'kq) çsjf.kd ifjiFk ds fy, 'kfDr xq.kkad dk eku gksrk gS % 1
(A) 0 (B) 1

(C) 2 (D) 2

The value of power factor for a purely inductive circuit is :
(A) 0 (B) 1

(C) 2 (D) 2
(vi) fdlh ifjiFk esa çR;korhZ /kkjk i = I 0 sin(ωt + π / 2) çokfgr gks jgh gSA bl /kkjk dk
r.m.s. eku gS % 1

(A) I 0 (B) I 0 / ω

(C) I 0 / 2 (D) ωI 0

An alternating current i = I 0 sin(ωt + π / 2) is flowing in a circuit.
The r.m.s. value of this current is :
(A) I 0 (B) I 0 / ω

(C) I 0 / 2 (D) ωI 0

(vii) fuEufyf[kr esa ls dkSu oS|qr-~ pqacdh; rjaxsa ugha gSa \ 1

(A) xkek-fdj.ksa (B) chVk-fdj.ksa
(C) ,Dl-fdj.ksa (D) vojDr fdj.ksa
Which of the following are not electromagnetic waves ?
3628/(Set : C) P. T. O.

(6) 3628/(Set : C)
(A) Gamma-rays (B) β-rays
(C) X-rays (D) Infrared-rays
(viii)−2D {kerk ds ysal dh Qksdl nwjh gS % 1
(A) + 50 lseh (B) − 50 lseh
(C) + 2 lseh (D) − 2 lseh
The focal length of a lens of power −2D is :

(A) + 50 cm (B) − 50 cm

(C) + 2 cm (D) − 2 cm

(ix) dkSu-lk çHkko çdk'k rjaxksa dh çÑfr dks n'kkZrk gS \ 1

(A) O;frdj.k (B) foorZu

(C) /kzqohdj.k (D) buesa ls dksbZ ugha

Which phenomenon illustrates the nature of light waves ?
(A) Interference (B) Diffraction
(C) Polarization (D) None of the above
(x) ,d Vh0 oh0 Vkoj dh Å¡pkbZ 64 ehVj gSA ;fn i`Foh dh f=T;k 6400 fdeh gks] rks
bldk çlkj.k vf/kdre fdruh nwjh rd fd;k tk ldrk gS \ 1
(A) 6.4 10 fdeh (B) 64 fdeh
(C) 6.4 20 fdeh (D) 640 fdeh
The height of a T. V. tower is 64 m. If radius of earth is 6400 km,
what is the maximum distance of transmission from it ?
(A) 6.4 10 km (B) 64 km
(C) 6.4 20 km (D) 640 km
(xi) 64 V ds foHkokUrj }kjk Rofjr fdlh bysDVªkWu ls lacaf/kr ns czkWXyh rjaxnS?;Z gS % 1

3628/(Set : C)

(7) 3628/(Set : C)
(A) 1.227 nm (B) 0.153 nm
(C) 1.53 nm (D) 12.27 nm

The de Broglie wavelength associated with an electron accelerated
through a potential difference of 64 V is :
(A) 1.227 nm (B) 0.153 nm

(C) 1.53 nm (D) 12.27 nm

(xii)gkbMªkstu ijek.kq ds LisDVªe esa dkSu-lh Js.kh n`'; {ks= esa gksrh gS \ 1

(A) ykbeSu (B) ik'ku

(C) QqaV (D) ckej

Which spectral series of hydrogen atom lie in the visible region ?
(A) Lyman (B) Paschen
(C) Pfund (D) Balmer

[ vfry?kq
vfry?kq mÙkjh; ç'u ]
[ Very Short Answer Type Questions ]

2. fuEukafdr fp= esa nks fcUnqvksa A vkSj B ds chp dh /kkfjrk Kkr dhft, %
2

C1 C2 C3 C4
A P Q R
B
4 µF 3 µF 2 µF 9 µF

Calculate the equivalent capacitance between the points A and B in the
following Figure :

C1 C2 C3 C4
A : C) P Q R
3628/(Set B P. T. O.
4 µF 3 µF 2 µF 9 µF

(8) 3628/(Set : C)

3. vkse ds fu;e dks le>kb,A 2

Explain the Ohm's law.

4. ehVjlsrq }kjk fdlh vKkr çfrjks/k dk eku fudkyus ds fy, ifjiFk fp= cukb,A blds fy,
mi;ksx gksus okys lehdj.k dks fyf[k,A 2

Draw the circuit diagram to determine unknown resistance using
metrebridge. Write the equation used for determining the unknown
resistance.

5. pqacdh; rhozrk H ds in dks ifjHkkf"kr dhft, vkSj bldk ek=d fyf[k,A
2

Define the term magnetic intensity H and write its unit.

6. ysat+ ds fu;e dks le>kb,A 2

Explain Lenz's law.

7. fdlh lery oS|qr~-pqacdh; rjax esa pqacdh; {ks= %
B y = 4 × 10 −7 sin(0.5 × 10 3 x − 1.5 × 1011t ) VsLyk gSA rjax dh vko`fÙk rFkk rjaxnS?;Z
D;k gS \ 2
The magnetic field in a plane electromagnetic wave is :
B y = 4 × 10 −7 sin(0.5 × 10 3 x − 1.5 × 1011t ) Tesla. What is the wavelength
and frequency of the wave ?
8. gkbMªkstu ijek.kq ds fy, cksj ekWMy ds dksbZ nks vfHkx`ghrksa dks fyf[k,A
2
Write any two postulates of Bohr's model for hydrogen atom.
3628/(Set : C)

(9) 3628/(Set : C)
9. fuEukafdr fp= esa fn[kk, x, ifjiFk ds fy, lR;eku lkj.kh cukb,A ;g ifjiFk fdl xsV dh
Hkk¡fr O;ogkj djrk gS \ 2

A Y
B

Write the truth table for the circuit shown in the following Figure. This
circuit acts like which gate ?

A Y
B

10. ekWMqyu D;k gksrk gS \ ,safVuk }kjk çHkkoh 'kfDr fofdj.k dk mnkgj.k nsdj bldh vko';drk
le>kb,A 2

What is Modulation ? Explain its necessity giving example of effective
power radiated by antenna.

[ y?kq mÙkjh; ç'u ]

[ Short Answer Type Questions ]

11. fdlh ,dleku vkosf'kr irys xksyh; [kksy ds vUnj fdlh fcUnq ij fo|qr~ {ks= rhozrk E ds
fy, O;atd fudkfy,A 3

Find the expression for electric field intensity E due to a uniformly
charged thin spherical shell at a point inside the shell.

12. ,d Js.khc) LCR ifjiFk] ftlesa R = 50 Ω, L = 4H rFkk C = 100 µF gS] dks ,d
ifjorhZ vko`fÙk 250 V ac vkiwfrZ ls tksM+k x;k gSA

(a) òksr dh fdl dks.kh; vko`fÙk ω0 ij vuqukn gksxk \

3628/(Set : C) P. T. O.

( 10 ) 3628/(Set : C)
(b) vuqukn dh voLFkk esa çfrck/kk rFkk /kkjk dh x.kuk dhft,A
3

A series LCR circuit with R = 50 Ω L = 4 H and C = 100 µF is
connected to a variable frequency 250 V ac supply.

(a) What is the angular frequency ω0 of the source at which
resonance occurs ?

(b) Calculate the impedance and current resonant condition.

13. çdk'k ds dyk-lac) òksr D;k gSa \ nks dyk-lac) òksrksa }kjk fdlh ;FksPN fcanq ij laiks"kh
rFkk fouk'kh O;frdj.k ds fy, dkykarj φ D;k 'krs± fuHkk,xk \ xf.krh; :i ls çkIr djsaA 3
What are coherent sources of light ? Derive mathematically the
conditions for constructive and destructive interference at an arbitrary
point due to two coherent sources in terms of phase difference φ .

14. çdk'k-fo|qr~ çHkko D;k gS \ çdk'k-fo|qr~ /kkjk ij çdk'k dh rhozrk ds çHkko dks le>kb,A
3
What is photoelectric effect ? Explain effect of intensity on photoelectric
current.

A
15. æO;eku {kfr o ukfHkdh; ca/ku-ÅtkZ dks ifjHkkf"kr dhft,A fdlh Z X ukfHkd ds fy,
æO;eku {kfr o ukfHkdh; ca/ku-ÅtkZ dk eku fyf[k,A 3
A
Define mass defect and nuclear binding energy. For a nucleus Z X ,
write the value of mass defect and nuclear binding energy.

[ nh?kZ mÙkjh; ç'u ]

3628/(Set : C)

( 11 ) 3628/(Set : C)
[ Long Answer Type Questions ]

16. nks lekarj pkydksa ds chp yxus okys cy ds fy, O;atd fudkfy, ftlesa /kkjk ,d gh fn'kk
esa cg jgh gksA vr% ,d ,sfEi;j dks ifjHkkf"kr dhft,A 5

Derive an expression for the force between two parallel straight
conductors carrying currents in the same direction. Hence define one
ampere.

vFkok
OR

,d py daqMyh xSYosuksehVj ds fl)kUr dk o.kZu djsaA bls ,sehVj esa dSls cnyk tkrk gS \
5
Explain the principle of a moving coil galvanometer. How can it be
converted into an ammeter ?

17. gkbxsal jpuk dk mi;ksx djrs gq, fdlh lery rjax dk lery i`"B ls ijkorZu le>kb,A
5

Using Huygen's construction, explain reflection of a plane wave by a
plane surface.

vFkok
OR

fdlh la;qDr lw{en'khZ esa çfrfcac cuus dk ukekafdr fdj.k vkjs[k cukb,A bldh vko/kZu
{kerk dks ifjHkkf"kr dhft, rFkk blds fy, O;atd fyf[k,A 5
Draw a labelled ray diagram showing the formation of image in a
compound microscope. Define its magnifying power and write
expression for it.

3628/(Set : C) P. T. O.

( 12 ) 3628/(Set : C)
18. mHk;fu"B mRltZd VªkaftLVj ço/kZd dh dk;Zfof/k dks ifjiFk vkjs[k cukdj le>kb,A
5

Explain the working of a common emitter transistor amplifier using its
circuit diagram.

vFkok
OR

fdlh VªkaftLVj (p-n-p ;k n-p-n) ds mHk;fu"B mRltZd foU;kl esa vfHkyk{kf.kd ds v/;;u
ds fy, ifjiFk vkjs[k cukb,A bl foU;kl esa blds % (i) fuos'k vfHkyk{kf.kd o
(ii) fuxZr vfHkyk{kf.kd ds LdSp [khafp,A 5

Draw a circuit diagram to study characteristics of a transistor (p-n-p or
n-p-n) in common emitter configuration. Draw the sketch of : (i)
input characteristics and (ii) output characteristics for this
configuration.

S

3628/(Set : C)