Sam ple Pap er 6

Class XII 2023-24

CreJ) Phys ics Max. Marks: 70
Time: 3 Hours
General Instructions: .
lsory. .
l. There are 33 questions in all. All questions are compu n C, Sectio n D and Sectio n
n A, Sectio n B, Sectio
2. This question paper has five sections: Sectio
E.
3. All the sections are compulsory.
four assert ion reason ing _based of
4. Section A contains sixteen questions, twelve MCQ and
each, Section C conta ins seven
1 mark each, Section B contains five questions of 2 marks
based questi ons of 4 marks each
questions of 3 marks each, Section D contains two case study
and Section E contains three long questions of 5 marks each.
been provid ed in one quest ion in
5. There is no overall choice. However, an intern al choice has
CBQ in Sectio n D and all three
Sectio n B, one question in Section C, one question in each
choices in such quest ions
questi ons in Section E. You have to attem pt only one of the
6. Use of calculators is not allowed.
ever neces sary
7. You may use the following values of physical const ants where 34
1. c = 3 x 11 m/s
3 v. h = 6.63 X 10- Js
2
vi. co = 8.854 X 10- cf N- m-
12 1
11. me = 9.1 X 10- kg
31

vii. Avog adro's numb er = 6.023 x 10 per

23

111. e = 1.6 x 10- C •

19

1v. µo = 41r x 10-1 TmA-

1 gram mole

SECTION-A
, but not at very low temp eratu res.
~ e substances, charge can flow at ordinary temperature
These substa nces are called
(a) condu ctors (b) insula tors
(c) dielec trics (d) semic onduc tors

tanct of the pair of coils depen ds

Two coils are place d close to each other . The mutu al induc
" \ upon
(a) curre nts in the coils
(b) mater ials of the wires of the coils
(c) relati ve positi on and orien tation of the coils
( d) rates at whir,h the curre nts are chang ing in the coils

t>( At the rr_iagnetic poles of the Jarth, a campus needle will be1tc1,l
( a) vert1ca1 (b) horizo1
(c) inclin ed at 10° with the vertic al (d) inclin ed at 45° with the horiz ontal

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 CBSE Physics Class 12
Sample Paper 6
I Page 2

I ~ e length of a conductor is halved, then

its conductance will be
{b) doubled
(a) halved
{d) unchanged
(c) quadrupled

waves have the smallest wavelength?

~ h of the following electromagnetic
{b) X-rays
(a) ,-ray s
(d) infra-red rays
(c) UV waves
field
tant velocity in an electric field E and magn etic
~ o n is moving in a space with cons
field should be
B • The angle between electric field and magnetic
(b) 30°
(a) 0°
( d) 90 °
(C) 45 °

dary coil in a trans form er is 2:3. If a cell of 6

T~e ratio of no. of turns of prim ary coil to secon
ge across the secondary coil will be
V 1s conn ected across the prim ary coil, then volta
(b) 6 V
(a) 3 V
(d)1 2V
(c) 9V

is
The elect rosta tic energy store d in a capacitor
- 1
1 (b) QV
(a) 2 QV
2 (d) QV
(c) Q V

C for an alter natin g curre nt of frequency

4~ Hz is 25 n
9~ Reac tanc e of a capa citor of capa citan ce ·
.T~ ~o o~ C~ (d) l00µF
(b) 50µF (c) 75µF
(a) 25µF

by
. ~ s of a phot on of frequency v is given
(c) m = hv (d) m= h~
(a) m= J (b) m= h: C C

nce d exert some force F on each other. If they

~T wo charged spheres separated by a dista
4, then what is the force exerted, if all other
([/" l
are immersed in a liquid of dielectric constant
conditions are same?
(a) 2F (b) 4F (c) { (d)

focal f are placed in contact, the focal length of the

~ e n two converging lenses of same
cornbination is
(c) { (cl) 3f
(a) f (b) 2f

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 Page 3
CBSE Physics Class 12 Sample Paper 6

13~ t· ( , d to another isolated

sser ion A) : The whole charge of a conductor cannot be transierre
onductor.
Reason (R) : The total transfer of charge fro·m one to another is not possible. .
. t planation of Assertion.
(a ) Both Assertion and Reason are correct and Reason 1s the correc ex
. th rrect explanation of
(b) Both Assertion and Reason are correct, but Reason 1s not e co
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.
I . 1 ·1 • th following figure due to
1 Assertion : The magnetic field at the centre of the circu ar coi in e
he currents 11 and 12 is zero.

/ l
/

'' 0 / /
vv
G

Reason : 11 = 12 implies that the fields due to the c 1rrent 11 and 12 will be balanced.
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.

15. dssertio~: Long distance power transmission is done at high voltage.

I' R~on: At high voltage supply power losses are less. /
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.

lii" Assertion: The ferromagnetic substance do not obey Curie's law.

I/ \_,Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct, but Reason is not. the correct explanation of
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.

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I
I

CBSE Physics Class 12

Page 4 Sample Paper 6

SECTION-B
. .. . F due to a charge moving
Write the expression, in a vector form, for the Lorentz magnetic force . ?
Wl'th veloc1ty
. v- 1n
. a magnetic field B... What 1st
. he direct·10n of the
• magnetic force •

1t( Why cannot two magnetic lines of forces due to a bar magnet cross each 0ther?
,o d 12 FI • fr e space Give its
9 ~- ,n the wavelength of electromagnetic waves of frequency 6 X 10 z in e •
two applications.

~ e focal length of a equiconvex lens is equal to the radius of curvature of either face. What is
the value of refractive index of the material of the lens ?

/u1ght from two coherent sources is reaching the screen. If the path difference at a point on the
screen for the yellow light be 3;, then what will be the colour of the fringe at that point?
/ OR
What will be the effect of interference fringes if red light is replaced by blue light ?

SECTION-C
~ o m i c radius of first orbit of hydrogen atom- is 0.53 A. What is the radius of its fifth orbit?

/ . T h e V - I characteristic of a silicon diode is as shown in the figure. Calculate the resistance of

the diode at
1. I= 15 mA
2. V=- lOV.
J(mA)

30
/Silicon

20 ................... .

10

-lOV 0
--------+--=~--.J.....1...---V(V)
0.5 0.7 0.8
-Ip.A

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 Page 5
£Y
CBSE Physics Cl888 12
Sample Paper 6

What is polarization of charge? Which the help of 8 diagram show why the elect~ic fiel_d
between the plates of capacitor reduces on introducing a dielectric slab. Define t~e dielectric
constant on the basis of these fields. •• -

€X When an ideal capacitor charged AC by a DC battery, no current flows. However, when an

AC source
is
used, the current flows continuously. How does one explain this, based on the
is
concept of displacement current ?

~ w does a combination of lenses affect the size, position and nature of the image?

~ a w the circuit diagram of a full-wave rectifier using p - n junction diode. Explain its working
and show the output input waveforms.

the important properties of neutrons.

OR
An~ the following:
Why is the binding energy per nucleon found to be constant for nuclei in the range of mass
_ ;)-IDilber A lying between 30 and 170?
V When a heavy nucleus with mass number A = 240 breaks into two nuclei, A = 120, .-~nergy
1is released in the process.

SEC~flON-D
~ a r r o w tube is bent in the form of a circle of radius R, as shown in figure. Two small holes S
and D are made in the tube at the positions at right angle to each other. A source placed at S
generates a wave of intensity Io which is equally divided into two parts: one part travels along
the longer path, while the other travels along the shorter path. Both the waves meet at point
D where a detector is placed.

a maxima is formed at a detector, then the magnitude of wavelength >. of the wave
produced is given by
(a)?rR, (b) ?TR
2

(c) ;f4R (d) all of these

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 CBSE Physics Class 12
Page 6 Sample Paper 6

. . '9 ouble slit exper iment is

. d . . 10 . the interference
the mtens1ty ratio of two coherent sources used Youn~
u:.: mtens ities
9 : 1, then the ratio between the maxim um and mirum
patter n is
(a) 1 : 9 (b) 9 : 16
25: 16 (d) 16 : 9

The maximum intensity produced at D is given by

(a) 4/o (b) 2/0
lo (d) 3/0
where the path diffe:ence is
a Young's double slit experiment, the intensity at a point
es the maximum intensity, then I/ lo IS equal
'A/6 ( 'A - wavelength of the light) is I. If J0 denot
to
(a)½ (b) If
(c) _l (d) ¾

, , /_ OR
:wo identi cal light waves, propa gating in the same direction, have a p_hase difference d.
will be proportional to
After they superpose the intensity of the resulting wave
(a) cosc5 (b) cos(c5/2)

(c) cos2(c5/2) (d) cos2 c5

of lines of force i.e., electric field stren gth

Electric field streng th is proportional to the density
force cutting a unit area element placed
at a point is proportional to the number of lines of
the given figure, the electric field at P is
normal to the field at that point. As illustrated in
stronger that at Q.
Reigon of weak field

Reigon of strong field

N
(./(~
Electric lines of force about a positive point charge
(a) radially outwa rds (b)
are
circul ar clockwise

(c) radially inwards (d) parallel straight lines.

of force?
l7'i? f' Which of the following is false for electric lines
from positi ve charges and terminate on negative charges.
V~ (a) They always start
a charged conductor.
(b) They are always perpendicular to the surface of
(c) They alway:; forrn closed loops.
of uniform electric field.
(d) They are parallel and equally spaced in a region
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/

CBSE Physics Class 12 Sample Paper 6 Page 7

r,{, Which one of the following pattern of electric line of force in not possible in filed due to
\ stationary charges ?

(a)=====::::=:::: (b) *
(c)fa (d)

4 , ) Electric lines of force are curved

V"- (a) in the field of a single positive or negative charge
(b) in the field of two equal and opposite charges
(c) in the field of two like charges
(d) both (b) and (c)
OR
The figure below shows the electric field lines due to two positive charges. The magnitudes
EA, En and Ee 6f the electric fields at points A, B and C respectively are related as
B

(a) EA > En > Ee (b) En> EA> Ee

(C) EA = En > Ee (d) EA> En= Ee

\
SECTION-E
State Gauss theorem.
31.~
Apply this to obtain the expression for the electric field intensity at a point due to an
infinitely long, thin, uniformly charged straight wire.
OR
Two spherical conductors of radii 4 cm and 5 cm are charged to the same potential. If a 1 and
a 2 be the respective values of the surface density of charge on both the conductors, What is
the ratio of CTi ?
a1.

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 CBSE Physics Class 12
Page 8 Sample Paper 6

Two long straight parallel conductors carrying steady currents /1 and 12 are s~parated by a
distance r. Explain briefly, with the help of a suitable diagram, how the magnetic field duethto
one conductor acts on the other. Hence deduce the expression for the force acting between e
two conductors. Mention the nature of the force.
OR

c{ Explain principle and working of a moving coil galvanometer. Derive an expression for
current sensitivity.
ri Compare between moving coil galvanometer and moving magnet galvanometer.

State Bohr's quantization condition for defining stationary orbits. How does the Broglie
_/nypothe sis, explain the stationary orbits?
v2- Find the relation between the three wavelengths .,\ 1 , .,\ 2 and .,\ 3 from the energy level
diagram shown below.
------·C

OR
~The radius of the innermost electron orbit of a· hydrogen atom is 5.3 x 10- m. Calculate
11

~adius in n = 3 orbit.
~The total energy of an electron in the first excited state of the hydrogen atom, is -3.4 eV.
Find out its (a) kinetic energy and (b) potential energy in this state.

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