HBSE Class 12 Question Paper 2018 Physics

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

Roll No. SET : A
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
ijh{kk
{kk ds
mijkUr bl lEcU/k esa dksbZ Hkh nkok Lohdkj ugha fd;k tk;sxkA
3628/(Set : A) P. T. O.

(2) 3628/(Set : A)
• 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 : A)

(3) 3628/(Set : A)
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 bysDVªkWu ij vkos'k gksrk gS % 1

(A) 0 C (B) 1C

(C) − 2.6 × 10 −19 C (D) − 1.6 × 10 −19 C

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

(4) 3628/(Set : A)
The charge on an electron is :

(A) 0 C (B) 1C

(C) − 2.6 × 10 −19 C (D) − 1.6 × 10 −19 C

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

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

(C) nksxquk (D) pkj xquk

When the distance between two charged particles is doubled, the
force between them becomes :

(A) one-fourth (B) half

(C) double (D) four times

(iii) rkieku esa o`f) ls fdlh pkyd dh çfrjks/kdrk % 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 resistivity of a conductor :

(A) increases

(B) decreases

(C) may increase or decrease

(D) does not change

3628/(Set : A)

(5) 3628/(Set : A)
(iv) 1 kΩ ds çfrjks/kd ds fljksa ij 2V foHkokUrj yxk gks] rks blesa fdruh fo|qr~ /kkjk cg
jgh gS \ 1

(A) 2 µA (B) 2 mA

(C) 2 A (D) 1 A

How much current is flowing through a 1 kΩ resistor when a
potential difference of 2V is applied across its end ?

(A) 2 µA (B) 2 mA

(C) 2 A (D) 1 A

(v) fdlh ac òksr dks çfrjks/kd ls tksM+k x;k gSA blesa cgus okyh /kkjk o ç;qDr oksYVrk ds
chp dkykarj gksrk gS % 1
(A) 0° (B) 45°
(C) 90° (D) 180°
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°

(vi) fdlh çfrjks/kd ds fljksa ij oksYVrk v = V 0 sin wt gSA bl oksYVrk dk oxZ ek/; ewy
(r.m.s.) eku gS % 1

(A) V 0 (B) 2V 0

(C) V 0 / 2 (D) 2 V0

The voltage across the ends of a resistor is v = V 0 sin wt . The r.m.s.
value of this voltage is :
(A) V 0 (B) 2V 0

(C) V 0 / 2 (D) 2 V0

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

(6) 3628/(Set : A)
(vii)xkek-fdj.kksa dk fuokZr esa pky dk eku D;k gS \ 1

(A) 2c (B) c
c c
(C) (D)
2 2

What is the value of speed of γ-rays in vacuum ?

(A) 2c (B) c
c c
(C) (D)
2 2

(viii)−4D {kerk ds ysal dh Qksdl nwjh gS % 1

(A) + 25 lseh (B) + 4 lseh

(C) − 25 lseh (D) − 4 lseh

The focal length of a lens of power −4D is :

(A) + 25 cm (B) + 4 cm

(C) − 25 cm (D) − 4 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 nature of light waves ?

(A) Interference (B) Diffraction

(C) Polarization (D) None of the above

3628/(Set : A)

(7) 3628/(Set : A)
(x) ,d Vh0 oh0 VkWoj dh Å¡pkbZ 100 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) 100 fdeh (B) 64 10 fdeh

(C) 6.4 10 fdeh (D) 8 20 fdeh

The height of a T. V. tower is 100 m. If radius of earth is 6400 km,
then what is the maximum distance of transmission from it ?

(A) 100 km (B) 64 10 km

(C) 6.4 10 km (D) 8 20 km

(xi) 121 V ds foHkokUrj }kjk Rofjr fdlh bysDVªkWu ls lacaf/kr ns czkWXyh rjaxnS?;Z gS % 1

(A) 1.227 nm (B) 12.270 nm

(C) 0.112 nm (D) 11.200 nm

The de Broglie wavelength associated with an electron accelerated
through a potential difference of 121 V is :

(A) 1.227 nm (B) 12.270 nm

(C) 0.112 nm (D) 11.200 nm

(xii)gkbMªkstu ijek.kq ds LisDVªe esa dkSu-lh Js.kh ugha gksrh gS \ 1

(A) fo'ks"k (B) ykbeSu

(C) ckej (D) ik'ku

Which spectral series does not lie in the spectrum of hydrogen atom
?
(A) Special (B) Lyman
(C) Balmar (D) Paschen

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

(8) 3628/(Set : A)
[ 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
2 µF 3 µF 5 µF 10 µF
Calculate the equivalent capacitance between the points A and B in the
following Figure :
C1 C2 C3 C4
A P Q R
B
2 µF 3 µF 5 µF 10 µF

3. fdj[kksQ ds laf/k fu;e dks le>kb,A 2

Explain the Kirchhoff's junction rule.

4. ehVj lsrq }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 for determining the unknown
resistance.

5. pqacd'khyrk µ ds in dks ifjHkkf"kr dhft, vkSj bldk ek=d fyf[k,A
2

Define the term magnetic permeability µ and write its unit.

6. QSjkMs ds oS|qr~-pqacdh; çsj.k fu;e dks fy[kdj le>kb,A 2

3628/(Set : A)

(9) 3628/(Set : A)
State and explain Faraday's law of electromagnetic induction.
7. fdlh lery oS|qr~-pqacdh; rjax esa pqacdh; {ks= %
B y = 2 × 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 = 2 × 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.

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

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

A Y

10. ekWMqyu D;k gksrk gS \ ,safVuk ds lkbt+ dk mnkgj.k nsdj bldh vko';drk le>kb,A
2

What is Modulation ? Explain its necessity giving example of size of
antenna.

[ y?kq mÙkjh; ç'u ]

[ Short Answer Type Questions ]

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

( 10 ) 3628/(Set : A)
11. fdlh ,dleku vkosf'kr irys xksyh; [kksy ds ckgj 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 outside the shell.

12. ,d Js.khc) LCR ifjiFk] ftlesa R = 20 Ω, L = 5H rFkk C = 80 µF gS] dks ,d
ifjorhZ vko`fÙk 220 V ac vkiwfrZ ls tksM+k x;k gSA
3

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

(b) vuqukn dh voLFkk esa çfrck/kk rFkk /kkjk dh x.kuk dhft,A
3

A series LCR circuit with R = 20 Ω, L = 5H and C = 80 µF is connected
to a variable frequency 220 V ac supply.

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

(b) Calculate the impedance and current at resonant condition.

13. çdk'k rjaxksa dk O;frdj.k D;k gksrk gS \ bls ns[kus ds fy, nks vfuok;Z 'krs± crkb,A
3

What is interference of light waves ? State two essential conditions to
observe it.

14. çdk'k-fo|qr~ /kkjk ij foHko ds çHkko dks le>kb,A 3

3628/(Set : A)

( 11 ) 3628/(Set : A)
Explain effect of potential on photoelectric current.

15. ,d ukfHkdh; ;qXe dh fLFkfrt ÅtkZ o muds chp dh nwjh ds xzkQ dks [khafp,A blds eq[;
y{k.k Hkh fyf[k,A 3

Draw a graph between potential energy of a pair of nucleons and
separation between them. Also write its main features.

[ nh?kZ mÙkjh; ç'u ]

[ Long Answer Type Questions ]

16. ,d py dqaMyh 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 ?

vFkok
OR

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.

17. 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 : A) P. T. O.

( 12 ) 3628/(Set : A)
vFkok

OR

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.

18. fdlh VªkaftLVj ço/kZd dk ifjiFk vkjs[k cukdj bldh dk;Zfof/k le>kb,A
5

Explain the working of a 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 : A)