PSEB 12th Sample Paper 2025 Physics

Punjab Board

Sample Academic Year
2025

Paper

P.S.E.B Sample Paper for 2024-25
Time : 3 Hours Class 12TH Subject: Physics Max Marks: 70

Question number 1 contains 20 parts of one marks each. Question
number 2 to 8 are of two marks each. Question number 9 to 15 are of
three marks each. Question number 16 (Comprehension) is of five
marks. Question number 17 and 18 are of five marks each with internal
choice. All questions are compulsory.
1. One mark questions:
(i) Electric field intensity due to an electric dipole of very small
length at a point on axial line at a distance r from its center
varies as:
(a) r
(b) r ଶ
(c) r ିଶ
(d)r ିଷ

(ii) The electric potential inside a conducting sphere is:
(a) Zero
(b) Increases from centre to the surface of the sphere.
(c) Decreases from centre to the surface of the sphere.
(d)Remains constant from centre to the surface of the sphere.

(iii) The electrical resistance of metals:
(a) Increases with increase in temperature.
(b) Is independent of temperature.
(c) Decreases with increase in temperature.
(d)None of the above.

(iv) The effect of temperature of the conductor on the drift
velocity of electrons.
(a) varies linearly with temperature
b) does not depend on the temperature
c) increases with increasing temperature

d) decreases with increasing temperature

(v) Path of charged particle entering in uniform magnetic field at
an angle 60଴ is :
(a) Straight line.
(b) Helical.
(c) Parabola.
(d)Circular.

(vi) Lenz’s law gives:
(a) The magnitude of induced emf.
(b) Magnitude of induced current.
(c) The direction of induced emf.
(d)Both the magnitude and direction of induced emf.

(vii) What is the angle between reflected ray and refracted ray
when angle of incidence is equal to angle of polarization?
(a) 90଴
(b) 0଴
(c) 30଴
(d)120଴

(viii) What will happen, if the electron revolving around nucleus
of an atom becomes stationary?
(a) Will move away from nucleus.
(b) Will falls into nucleus.
(c) Nothing will happen.
(d)None of the above.

(ix) What is the name given to the type of electromagnetic waves
used to capture photographs of earth in foggy conditions :
(a) Visible rays.
(b) UV rays.
(c) Microwaves.
(d)Infrared rays.

(x) Which mirror is used as shaving mirror?
(a) Concave mirror.
(b) Convex mirror.

(c) Plane mirror.
(d)Parabolic mirror.

(xi) The stopping potential depends upon:
(a) Intensity on incident light.
(b) Energy of incident light.
(c) Surface area of the metal.
(d)Independent of Intensity of incident light.

(xii) When Boron is added as impurity to silicon, semiconductor
becomes:
(a) N type semiconductor.
(b) P type semiconductor.
(c) PN junction.
(d)None of the above.

(xiii) Isolated magnetic poles called magnetic monopoles are not
known to exist. This statement is the result of:
(a) Gauss’s theorem in electrostatics.
(b) Gauss’s theorem in magnetism.
(c) Both a and b.
(d)None of the above.

(xiv) Which of the following pairs is an isobar?
(a) ଵଵH and ଶଵH
(b) ଶଵH and ଷଵH
(c) ଵଷ଺C and ଵଶ଺C
(d) ସ଴ ସ଴
ଵ଼Ar and ଵଽK

(xv) Wave front due to light source situated at infinity is:
(a) Spherical.
(b) Cylindrical.
(c) Plane.
(d)None of the above.

True/ False
(xvi) When forward biasing is applied to the PN junction, width
of depletion layer increases. (T/F)

(xvii) Photoelectric effect is not possible for the light of all
frequencies.
(xviii) AC generator is based upon principle of
electromagnetic induction.
(xix) Power of a thick lens is smaller than the thin lens.
(xx) Sustained interference is caused by the superposition of two
waves coming from two coherent sources.
Two marks questions:

2. What do you mean by quantization of charge?
OR
What is the Coulomb’s force between two small charged spheres
having charge of
ି଻ ି଻
2× 10 C and 3 × 10 ‫ ݈݀݁ܿܽ݌ ܥ‬30 ܿ݉ ܽ‫ݎ݅ܽ ݊݅ ݐݎܽ݌‬.

3. Define Kirchhoff’s first and second law.
OR
A wire of length 15 m and uniform area of cross section 6×
10ି଻ ݉ଶ has resistance of 5 Ω. Find the value of resistivity of the
material of the wire.

4. Draw labelled diagram of converting a galvanometer into an
ammeter.

5. State Faraday’s law of electromagnetic induction.
6. Give any two uses of X Rays.
7. Write Einstein’s photo electric equation.
OR
Calculate de Broglie wavelength of electron moving with speed of 6
× 10ହ ݉‫ି ݏ‬ଵ .
8. Write any two difference between nuclear fission and nuclear
fusion.

Three marks question.
9. What is an equipotential surface? Show that no work is done in
moving a given charge over an equipotential surface.

10. With a circuit diagram, explain how a meter bridge can be used to
determine unknown resistance of a given wire.
11. Derive an expression for force per unit length between two
parallel straight conductors carrying current in same direction.
OR
A solenoid of length 0.5 m has radius of 1 cm and is made up of
500 turns. It carries a current of 5 A. What is the magnitude of
magnetic field inside the solenoid?
12. What do you mean by impedance of LCR series circuit? Derive an
expression for it by using phasor diagram.
OR
Find the coefficient of mutual inductance of a pair of a coil if a
current of 3 A in one coil causes the flux in the second coil of 1000
turns to change by 10ିସ weber in each turn.
13. What is total internal reflection? Write necessary conditions for it.
OR
The distance of object needle is 45 cm from a lens which forms an
image on the screen placed 90 cm on the other side. What is the
type of lens? What is the focal length and the size of the image if
the size of object needle is 5 cm?
14. Define binding energy per nucleon. Draw and explain the curve
between binding energy per nucleon and mass number.
15. With help of a circuit diagram, explain V-I characteristics of a PN
junction diode in forward biasing.
16. Read the passage carefully and answer the questions from (a) to
(e).

The strength of the earth's magnetic field varies from place to place
on the earth's surface; its value being of the order of 10ିହ T.
What causes the earth to have a
magnetic field is not clear. Originally the magnetic field was
thought of as arising from a giant bar magnet placed
approximately along the axis of rotation of the earth and deep in
the interior. However, this simplistic picture is certainly not
correct. The magnetic field is now thought to arise due to electrical
currents produced by convective motion of metallic fluids
(consisting mostly of molten iron and nickel) in the outer core of
the earth. This is known as the dynamo effect.
The magnetic field lines of the
earth resemble that of a (hypothetical) magnetic dipole located at
the centre of the earth. The axis of the dipole does not coincide
with the axis of rotation of the earth but is presently tilted by
approximately 11.3° with respect to the later. In this way of
looking at it, the magnetic poles are located where the magnetic
field lines due to the dipole enter or leave the earth. The location of
the north magnetic pole is at a latitude of 79.74° N and a longitude
of 71.8° W, a place somewhere in north Canada. The magnetic
south pole is at 79.74° S, 108.22° E in the Antarctica.

(a) What is the order of magnitude of magnetic field of earth? (1)
(b) What is the cause of magnetic field of earth assumed these
days?(1)
(c) What is the angle between magnetic dipole located at the center
of the earth and axis of rotation of the earth?(1)
(d)Where are the magnetic poles located?(1)
(e) What is the location of magnetic South Pole?(1)

Five marks question:
17. State Gauss’s theorem. Using this theorem, derive electric field
intensity due to thin uniformly charged infinite plane sheet. (1,4)
OR
Define capacitance. Derive capacitance of a parallel plate capacitor
having dielectric slab between its plates.(1,4)
18. With help of labelled diagram, write principle of astronomical
telescope and derive expression for magnifying power of an
astronomical telescope, when final image is formed at least distance
of distinct vision. (1,1,3)

OR
What is interference of light? Derive an expression for the fringe
width in the Young’s double slit experiment. (1,4)

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