Rajasthan Board Class 12 Question Paper 2019 Physics

Zm_m§ H $ Roll No.

Tear Here
Sl.No. :

No. of Questions – 30
SS–40–1–Phy.
No. of Printed Pages – 11

Cƒ _mÜ`{_H$ narjm, 2019
SENIOR SECONDARY EXAMINATION, 2019

TEAR HERE TO OPEN THE QUESTION PAPER
^m¡{VH$ {dkmZ
PHYSICS

àíZ nÌ H$mo ImobZo Ho$ {bE `hm± \$m‹S>|
g_` : 3¼ KÊQ>o
nyUmªH$ : 56

narjm{W© ` m| Ho $ {bE gm_mÝ` {ZX} e …
GENERAL INSTRUCTIONS TO THE EXAMINEES :

1) narjmWu gd©àW_ AnZo àíZ nÌ na Zm_m§H$ A{Zdm`©V… {bI| &
Candidate must write first his/her Roll No. on the question paper
compulsorily.
2) g^r àíZ H$aZm A{Zdm`© h¢ &
All the questions are compulsory.
3) àË`oH$ àíZ H$m CÎma Xr JB© CÎma-nwpñVH$m _| hr {bI| &
Write the answer to each question in the given answer-book only.
4) {OZ àíZmo§ _| AmÝV[aH$ IÊS> h¡§, CZ g^r Ho$ CÎma EH$ gmW hr {bI|&
For questions having more than one part, the answers to those parts are to
be written together in continuity.
5) àíZ nÌ Ho$ {hÝXr d A§J«oOr ê$nmÝVa _| {H$gr àH$ma H$s Ìw{Q> / AÝVa / {damoYm^mg hmoZo na
{hÝXr ^mfm Ho$ àíZ H$mo ghr _mZ|&
`hm± go H$m{Q>E

If there is any error/ difference/ contradiction in Hindi & English versions of
the question paper, the question of Hindi version should be treated valid.

SS–40–1–Phy. 1332 [ Turn Over

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6) àíZ g§»`m A§H$ àË`oH$ àíZ
1 - 13 1
14 - 24 2
25 - 27 3
28 - 30 4

Q. Nos. Marks per question
1 - 13 1
14 - 24 2
25 - 27 3
28 - 30 4

7) àíZ g§»¶m 21 VWm 27 go 30 _| AmÝV[aH$ {dH$ën h¢&
There are internal choices in Q.Nos. 21 and 27 to 30.

8) narjm ‘| H¡$bHw$boQ>a Ho$ Cn¶moJ H$s AZw‘{V Zht h¡&
Use of calculator is not allowed in the examination.

1) 10–9 Hy$bm°‘ Ho$ {~ÝXÿ Amdoe Ho$ H$maU 1m Xÿa {~ÝXÿ na {dYwV {d^d H$s JUZm H$s{OE& [1]
Calculate electric potential at a point 1m distance from a point charge of 10–9
coulomb.

2) {MÌ ‘| Xem©¶o H$m~©Z à{VamoY H$m ‘mZ 22  105   5% h¡& àW‘ db¶ A H$m a§J {b{IE& [1]

A bmb ham gwZham
In given diagram value of carbon resistor is 22  105   5% . Write colour of
first ring A.

A red green golden

SS–40 –1–Phy. 1332

3
3) Mwå~H$s¶ joÌ ‘| Ymamdmhr MmbH$ na ~b H$m gyÌ {b{IE& [1]
Write formula for force on a current carrying conductor in a magnetic field.

4) Z‘Z H$moU (Z{V H$moU) H$mo n[a^m{fV H$s{OE& n¥Ïdr Ho$ Mwå~H$s¶ Y«wdm| na Z‘Z H$moU H$m ‘mZ {b{IE&
[½+½=1]
Define angle of dip. Write value of angle of dip at magnetic poles of earth.

5) à˶mdVu Ymam Ho$ dJ©‘mܶ ‘yb (rms) ‘mZ Ed‘² {eIa ‘mZ ‘| g§~§Y {b{IE& [1]
Write relation between root mean square (rms) value and peak value of alternating
current.

6) {H$gr LCR à˶mdVu n[anW ‘| R = 10, XL = 100Ed‘² XC = 100h¡& n[anW H$s à{V~mYm
H$m ‘mZ {b{IE& [1]
In LCR alternating circuit, R = 10, XL = 100 and XC = 100. Write value of
impedance of circuit.

7) b¢g H$s j‘Vm Ed‘² CgH$s ’$moH$b Xÿar ‘| g§~§Y {b{IE& [1]
Write relation between power of lens and it's focal length.

8) Xohbr Amd¥{Îm H$mo n[a^m{fV H$s{OE& [1]
Define threshold frequency.

9) S>odrgZ Ed‘² Oa‘a à¶moJ H$s àm¶mo{JH$ ì¶dñWm H$m {MÌ ~ZmB¶o& [1]
Draw diagram of the experimental arrangement of Davission and Germer experiment.

10) H$moB© Bbo³Q´>m°Z Cƒ COm© ñVa n2 = 2, 3, 4, 5 ......... go ‘yb COm© ñVa n1 = 1 ‘| g§H«$‘U H$aVm h¡ Vmo àmßV
hmBS´>moOZ ñno³Q´>‘ H$s loUr H$m Zm‘ {b{IE& [1]
Write name of series of hydrogen spectrum obtained when an electron transist
from higher energy level n2 = 2, 3, 4, 5 ......... to ground energy level n1 = 1.

SS–40 –1–Phy. 1332 [ Turn Over

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11) {MÌ ‘| {ZJ©‘ Y H$m ‘mZ {b{IE& [1]

0
1
Y
1
1

Write value of output Y in diagram.
0
1
Y
1
1

12) ‘moSy>bZ H$mo n[a^m{fV H$s{OE& [1]
Define modulation.

 
13) {dÚwV Mwå~H$s¶ Va§Jm| ‘| {dÚwV joÌ E Ed‘² Mwå~H$s¶ joÌ B Ho$ ‘ܶ (A) H$moU Ed‘² (~) H$bmÝVa, H$m
‘mZ {b{IE& [½+½=1]
In electromagnetic waves, write the value of (A) angle and (B) phase difference,
 
between electric field E and magnetic field B .

14) n[a^m{fV H$s{OE : [1+1=2]
A) {dÚwV {ÛY«wd AmKyU©&
~) g‘ {d^d n¥îR>
Define :
a) Electric dipole moment.
b) Equipotential surface.

SS–40 –1–Phy. 1332

5
15) {MÌ ‘| ¶{X ìhrQ>ñQ>moZ goVw gÝVwbZ AdñWm ‘| h¡ Vmo AkmV à{VamoY R H$s JUZm H$s{OE& [2]
B 10
20
G
A 6 C

R 1
D

Calculate the value of unknown resistance R in given circuit. If wheatstone bridge
is in balanced condition.
B 10
20
G
A 6 C

R 1
D

16) A) ³¶yar Vmn H$mo n[a^m{fV H$s{OE&
~) 0.1 m à^mdr bå~mB© Ho$ N>‹S> Mwå~H$ Ho$ Y«wdm| H$s Y«wd àm~ë¶Vm 40 A-m h¡& BgHo$ Mwå~H$s¶ AmKyU©
H$s JUZm H$s{OE&
[½ + 1½ = 2]
a) Define Curie temperature.
b) The pole strength of poles of a bar magnet of effective length 0.1 m is 40 A-m.
Calculate it's magnetic moment.

17) b¢O H$m {Z¶‘ {b{IE& b¢O H$m {Z¶‘ COm© g§ajU {Z¶‘ H$m nmbZ H$aVm h¡& g‘PmB¶o& [½ + 1½ = 2]
Write Lenz's law. Lenz's law obey's law of conservation of energy. Explain.

18) n[a^mfm {b{IE : [1 + 1 = 2]
A) nyU© AmÝV[aH$ namdV©Z ~) àH$me H$m {ddV©Z
Write definitions :
a) Total internal reflection. b) Diffraction of light.

SS–40 –1–Phy. 1332 [ Turn Over

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19) A) ‘obg {Z¶‘ go g§~§{YV gyÌ {b{IE&
~) {H$gr nmaXeu n{Å>H$m na O~ àH$me 60° H$moU na Amn{VV hmoVm h¡ Vmo namdVuV àH$me nyU©V… Y«w{dV
hmoVm h¡& nXmW© H$m AndV©Zm§H$ Ed‘² AndV©Z H$moU kmV H$s{OE&
[½ + 1 + ½ = 2]
a) Write formula related to Malus law.
b) When light is incident at 60° on a transparent sheet, the reflected light is
completely polarised. Find the refractive index of the substance and refraction
angle.

20) 100 V {d^dmÝVa go Ëd[aV Bbo³Q´>m°Z go g§~Õ Va§J H$s Xo ~«mo½br Va§J X¡¿¶© H$s JUZm H$s{OE& [2]
Calculate de Broglie wavelength of a wave associated with an electron, which is
accelerated through a potential difference of 100 V.

21) {d^d‘mnr H$s ghm¶Vm go àmW{‘H$ gob H$m AmÝV[aH$ à{VamoY kmV H$aZo H$m gyÌ ì¶wËnÝZ H$s{OE& n[anW
{MÌ ~ZmB¶o& [½ + 1½ = 2]
AWdm
[½ + 1½ = 2]
‘rQ>a goVw Ûmam AkmV à{VamoY kmV H$aZo H$s {d{Y g‘PmB¶o& n[anW {MÌ ~ZmB¶o&
Derive formula for obtaining internal resistance of a primary cell with help of
potentiometer. Draw circuit diagram.
OR
Explain the method to find unknown resistance with the help of meter bridge.
Draw circuit diagram.

22) hmBS´>moOZ na‘mUw (hmBS´>moOZ gÑí¶ Am¶Z) Ho$ {bE Zrëg ~moa Ho$ H$moB© Xmo A{^J«{hV {b{IE&[1 + 1 = 2]
Write Niels Bohr's any two postulates for hydrogen atom (hydrogen like ions).

23) A) {ZåZ ‘| go J«mhr Aew{Õ N>m§{Q>E :
Amog}{ZH$ (As), EopÝQ>‘Zr (Sb), J¡{b¶‘ (Ga) Ed‘² ’$moñ’$moag (P).
~) OoZa S>m¶moS> H$m àVrH$ {MÝh ~ZmB¶o&
[1 + 1 = 2]
a) Select acceptor type impurity among the following:
arsenic (As), Antimony (Sb), gallium (Ga) and phosphorous (P).
b) Draw symbol of Zener diode.

SS–40 –1–Phy. 1332

7
 
B
24) ‘wº$ AmH$me ‘| {H$gr {~ÝXþ na {dÚwV joÌ E H$m n[a‘mU 300 V/m h¡& Bg {~ÝXþ na Mwå~H$s¶ joÌ H$m
n[a‘mU kmV H$s{OE& àH$me H$m doJ 3×108 m/s h¡& [2]

The magnitude of electric field E at a point in free space is 300 V/m. Find the

magnitude of magnetic field B at this point. Velocity of light is 3×108 m/s.

25) aXa’$moS>©-gmoS>r H$m ao{S>¶moEp³Q>d j¶ H$m {Z¶‘ {b{IE VWm g§~§{YV g‘rH$aU H$mo ì¶wËnÝZ H$s{OE& ao{S>¶moEp³Q>d
VËd H$m j¶ dH«$ ~ZmB¶o&
[1 + 1½ + ½ = 3]
{H$gr ao{S>¶moEp³Q>d VËd H$s AÕ© Am¶w Ed‘² ‘mܶ Am¶w H$m AZwnmV {b{IE&
Write Rutherford-Soddy law of radioactive decay and derive related equation.
Draw exponential decay curve of a radioactive substance.
Write ratio of half life and mean life of a radioactive substance.

26) PNP Q´>m§{OñQ>a C^¶{ZîR> CËgO©H$ {dݶßg Ho$ {bE {ZJ©V A{^bmj{UH$ dH«$ àmßV H$aZo hoVw Amdí¶H$
àm¶mo{JH$ ì¶dñWm H$mo {MÌ ~ZmVo hþE g‘PmBEo& àmßV A{^bmj{UH$ dH«$ ^r ~ZmB¶o&
{ZåZ ‘| go Q´>m§{OñQ>a C^¶{ZîR> AmYma Ymam àdY©Z JwUm§H$ H$m g§^m{dV ‘mZ N>m§{Q>E&
0.9, 9, 19, 49 Ed‘² 99. [1 + 1 + ½ + ½ = 3]
Describe the experimental set up for obtaining output characteristic curve of a
PNP transistor in common emitter configuration with suitable circuit diagram. Also
draw the curve obtained.
Select possible value of common base current amplification factor  of a transistor
among the following.
0.9, 9, 19, 49 and 99.

27) à˶mdVu dmoëQ>Vm ñÌmoV go Ow‹S>o EH$ loUr RLC n[anW Ho$ {bE g{Xe {MÌ (µ’o$Oa {MÌ) ~ZmVo hþE n[anW H$mo
à{V~mYm H$m 춧OH$ àmßV H$s{OE& [½ + 2½ = 3]
AWdm
g‘ê$n Mwå~H$s¶ joÌ ‘| KyU©Z H$aVr hþB© N>‹S> ‘| ào[aV {ddm~ Ho$ 춧OH$ H$s ì¶wËn{Îm H$s{OE& Amdí¶H$ {MÌ
~ZmB¶o& [½ + 2½ = 3]
Draw vector diagram (phasor diagram) for a series RLC circuit which is connected
with an alternating voltage source and determine the expression for impedance of
the circuit.
OR
Derive an expression for induced emf in a rod rotating in a uniform magnetic field.
Draw necessary diagram.

SS–40 –1–Phy. 1332 [ Turn Over

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28) A) pñWa d¡ÚwVH$s Ho$ {bE JmCg {Z¶‘ H$m H$WZ {b{IE& EH$ An[a{‘V g‘ê$n Amdo{eV AMmbH$ naV
(MmXa) Ho$ H$maU BgHo$ ZOXrH$ {H$gr {~ÝXþ na {dÚwV joÌ Ho$ {bE 춧OH$ ì¶wËnÝZ H$s{OE& Amdí¶H$
{MÌ ~ZmB¶o&
~) {XE J¶o {MÌ ‘| N>m§¶m{H$V joÌ go n[aUm‘r {dÚwV âb³g H$s JUZm H$s{OE&
[½+1+1½+1=4]

• 1 c

• 2 c
• (–1) c
• 2 c

AWdm
A) g§Ym[aÌ H$mo n[a^m{fV H$s{OE& n[anW {MÌ ~ZmH$a VrZ g§Ym[aÌm| Ho$ loUr g§¶moOZ ‘| Vwë¶ Ym[aVm Ho$
{bE g§~§Y àmßV H$s{OE&
~) {XE J¶o {MÌ ‘| {~ÝXþAm| A d B Ho$ ‘ܶ Vwë¶ Ym[aVm H$m ‘mZ kmV H$s{OE&
2f
A

1f 1f
8f

4f 4f

B
[½+1+1½+1=4]

SS–40 –1–Phy. 1332

9
a) Write the statement of Gauss's law for electrostatics. Derive an expression
for electric field due to an uniformly charged infinite non-conducting sheet at
a point near to it. Draw suitable diagram.
b) Calculate net electric flux from shaded region in given diagram.

• 1 c

• 2 c
• (–1) c
• 2 c

OR
a) Define capacitor. Draw a circuit diagram and obtain a relation for equivalent
capacitance for the series combination of three capacitors.
b) Find the equivalent capacitance between points A and B in given figure.

2f
A

1f 1f
8f

4f 4f

B

SS–40 –1–Phy. 1332 [ Turn Over

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29) A) Eoånr¶a H$m {Z¶‘ {b{IE&
~) {MÌ ~ZmH$a AZÝV bå~mB© Ho$ grYo Ymamdmhr MmbH$ Ho$ H$maU {H$gr {~ÝXþ na Mwå~H$s¶ joÌ H$s
ì¶wËn{V H$s{OE&
[1 + 1 + 2 = 4]
AWdm
A) ~m¶mo-gmdQ>© H$m {Z¶‘ {b{IE&
~) g§jon ‘| gmB³bmoQ´>m°Z H$s {H«$¶m {d{Y {b{IE& XmoZm| S>rµO ‘| Ëd[aV Amdo{eV H$Um| (Am¶Zm|) Ho$ nW H$mo
àX{e©V H$aVm gmB³bmoQ´>m°Z H$m ì¶dñWm AmaoI ~ZmB¶o& gmB³bmoQ´>m°Z H$s Amd¥{V H$m 춧OH$ ì¶wËnÝZ
H$s{OE&
[1 + 1 + 2 = 4]
a) Write Ampere's law.
b) Draw a diagram and derive an expression for magnetic field due to an infinitely
long straight current carrying conductor at any point.
OR
a) Write Biot-Savart law.
b) Write the working of cyclotron in brief. Draw a schematic sketch of the
cyclotron showing path of accelerated charged particles (ions) in both dees.
Derive expression for cyclotron frequency.

30) A) Xn©U g‘rH$aU H$m 춧OH$ ì¶wËnÝZ H$s{OE& Amdí¶H$ {H$aU {MÌ ~ZmB¶o&
~) 10 cm dH«$Vm {ÌÁ¶m Ho$ Jmobr¶ Xn©U H$s ’$moH$b Xÿar kmV H$s{OE&
[2 + 1 + 1 = 4]
AWdm
A) ì¶{ÎmH$aU q’«$O à{Vê$n CËnÝZ H$aZo Ho$ {bE ¶§Ì {Û pñbQ> à¶moJ H$m {H$aU {MÌ ~ZmB¶o& à{XßV q’«$Omo|
Ho$ {bE q’«$O Mm¡‹S>mB© H$m 춧OH$ ì¶wËnÝZ H$s{OE&
~) ¶§Ì {Û pñbQ> à¶moJ ‘| q’«$O Mm¡‹S>mB© 2 mm h¡& Ho$pÝж q’«$O go {Û{V¶ A{XßV q’«$O H$s Xÿar kmV H$s{OE&
[1 + 2 + 1 = 4]

SS–40 –1–Phy. 1332

11
a) Deduce an expression for mirror equation. Draw necessary ray diagram.

b) Find focal length of a spherical mirror of radius of curvature 10 cm.

OR

a) Draw a ray diagram to produce interference fringe pattern in Young's double
slit experiment. Derive an expression for fring width of bright fringes.

b) In Young's double slit experiment, fringe width is 2 mm. Find distance of
second dark fringe from central fringe.



SS–40 –1–Phy. 1332

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