PSEB Class 12 Physics Model Paper 2026, Download PDF

Board

Punjab School Education Board (PSEB)

Class

12

Academic Year

2025-26

Subject 

Physics

Total Marks

100

Theory Marks

70

Exam Duration

3 Hours

Sections

4 sections A, B, C and D

1. One mark questions:

(ii) The electric potential inside a conducting sphere is: 

(a)Zero 

(b)Increases from the 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 the nucleus of an atom becomes stationary? 

(a)Will move away from the nucleus. 

(b)Will falls into the 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 a 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, the 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. 

(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, the width of the depletion layer increases. (T/F) 

(xvii) Photoelectric effect is not possible for the light of all frequencies. 

(xviii) AC generator is based upon the principle of electromagnetic induction. 

(xix) The power of a thick lens is smaller than a thin lens. 

(xx) Sustained interference is caused by the superposition of two waves coming from two coherent sources.  

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 the 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 the magnetic field inside the solenoid? 

12.What do you mean by impedance of LCR series circuit? Derive an expression for it by using phasor diagrams. 

OR  

13.What is total internal reflection? Write necessary conditions for it. 

OR 

The distance of the 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 the 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)

Five marks question: 

17.State Gauss’s theorem. Using this theorem, derive electric field intensity due to a 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 the help of a labelled diagram, write the principle of an astronomical telescope and derive expression for magnifying power of an astronomical telescope, when the 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)

PSEB Class 12 Physics Model Paper 2026: Download PDF