PSEB Class XII Physics Sample Question Paper 2019-20 : Punjab School Education Board

Board : Punjab School Education Board PSEB
Class : Class XII
Subject : Physics
Document Type : Sample Question Paper/ Model Test Paper
Year : 2019-20
Website : https://www.pseb.ac.in/latest-news

PSEB XII Physics Sample Question Paper

Download the Sample question paper of Class XII Physics from the official website of Punjab School Education Board.

Related : PSEB Class XII Biology Sample Question Paper 2019-20 : www.pdfquestion.in/34823.html

Instructions

1. There will be one theory paper comprising of 18 questions.

2. Question No 1 will be carrying 20 objective type questions of one marks each. In objective type questions there will be 10 multiple choice questions [2 questions of internal choice one theory type and one numerical type in choice from unit 6 (optics) and from unit 7 (Dua Nature of matter)], 3 true/false statements, 2 fill in the blanks and 5 one word answers or definitions.

3. Question number 2 to 8 will be carrying two marks each. There will be three questions of internal choice from unit-I, unit-II and unit-IV. Each one will have one theory type question and one numerical type in choice.

4. Question number 9 to 15 will be carrying three marks each. There will be two questions of internal choice from unit-III (Magnetic effects of current and magnetism) and from unit-VI (Optics). Each one will have one theory question and one numerical type in choice.

5. Question number 16 to 18 will be carrying 5 marks each and there will be internal choice in each of all these questions. From unit VI (optics) internal choice questions will have one question from ray optics and choice question from wave optics.

Multiple Choice Questions

(i) An electric dipole is kept in a uniform electric field. It experiences
1. both a net force and a torque
2. only a net force but no torque
3. only a torque but no net force
4. neither a net force nor a torque

(ii). Cyclotron is used to accelerate
(a) Electrons
(b) neutrons
(c) Positive ions
(d) Negative ion

(iii) The power factor of pure resistive circuit is
(a) 0
(b) 1
(c) infinity
(d) 90

(iv) The velocity of light in vacuum can be changed by changing
(1) amplitude
(2) frequency
(3) wavelength
(4) medium

(v) Which nature of the wavefront is associated with a parallel beam of light ?
(1) plane
(2) spherical
(3) cylindrical
(4) all of these
Or
The focal length of the convex lens is 20 cm . its power will be
(a) 0.5 D
(b) -5D
(c) + 5 D
(d) -0.5 D

(vi) Photoelectric emission from a given surface of metal can take place when the value of a ‘physical quantity’ is less than the energy of incident photon. The physical quantity is
(a) Threshold frequency
(b) Work function of surface
(c) Threshold wave length
(d) Stopping potential
Or
The mass of photon at rest is
(a) 1 amu
(b) 1.6 x 10-27 kg
(c) 0
(d) 9.1 x 10-31 kg

(vii) Charge number increases by one during
(a) Alpha decay
(b) beta negative decay
(c ) beta positive decay
(d) gamma decay

(viii) A semiconductor with pentavalent impurity is
(a) P- type
(b) N – type
(c) Intrinsic
(d) L- type

(ix) Which mirror is used as driver mirror?
(A) Plane mirror
(B) convex mirror
(c) Concave mirror
(D)None

(x) A wire of resistance R is stretched to double its length . Its resistivity
(a) remains same (b) becomes half (b) becomes double (b) three times

True / false statements :
(xi) Ammeter is used to find value of resistance ? (True / False)
(xii) Electromagnetic waves are effected with electric field but not affected with magnetic field (True / false )
(xiii) Convex lens is used to converge ray of light .( True / false)

Fill in blanks :
(xiv) The Electromagnetic radiations used in electric oven is _______.
(xv) The reaction which takes place in sun is nuclear ……………………….

One word questions/ definitions :
(xvi) Define unit if capacitance ?
(xvii) What is shunt?
(xviii) What is the S.I unit of self inductance?
(xix) Write Einstein’s photoelectric equation?
(xx) What happen to width of depletion layer when p-n junction diode is reversed biased?

Two Marks Questions

Q2. Write any two uses of U.V rays ?
Q3. Derive the relation between drift velocity and current?
Or
Three resistors of 2 ohm each are arranged in a triangle. What is the resistance in ohms between two corners?

Q4. What is iron loss in a transformer and how can it be reduced ?
Or
How much current is drawn by primary coil of a transformer, which converts 220 V A.C. to 44V A.C. to operate a device of impedance 440 Ohm.

Q5. What are the conditions for total internal reflection ?
Q6. Why two electric lines of force never intersect each other
Or
Electric potential at 0.5 m from a point charge is 50 V. What is the magnitude and sign of charge?

Q7. Derive an expression for the radius of nth Bohr’s orbit in Hydrogen atom.
Q8. Distinguish between Extrinsic and intrinsic semiconductors ?

Download XII Physics Sample Question Paper :
https://www.pdfquestion.in/uploads/pdf2019/34815-SP.pdf

Three Marks Questions

Q9. Using sign conventions and assumptions derive lens maker formula for double convex lens.
Or
A double convex lens made of glass of refractive index 1.60 has both radii of curvature 30 cm each. Find the focal length of the lens. If an object is placed at a distance of 15 cm from this lens, find the position of the image formed. ?

Q10. Derive relation for de Broglie wavelength ?
Q11. Prove relation for total energy of Bohr’s orbit ?
Q12. Derive an expression for power in L-C-R series circuit connected to ac supply ?

Q13. Give a method to convert galvanometer in to ammeter.?
Or
A Galvanometer of 50 ohm resistance shows full scale deflection for a current of 2mA. Calculate shunt resistance needed to convert it to an ammeter of range 0-5 A.

Q14. Explain full wave rectifier with diagram?
Q15. Explain principle of a potentiometer and describe how will you use it to compare emf of two cells.

Five Marks Questions

Q16. Draw the course of ray in an astronomical telescope and find a relation for its magnifying power when the final image is formed at a distance of distinct vision.
Or
Define interference of light and deduce the expression for fringe width in Young’s double slit experiment.

Q17. Explain with the help of a labelled diagram the underlying principle, construction an working of a cyclotron.
Or
Using Ampere’s circuital law, derive an expression for magnetic field intensity produced at a point due to the current flowing through an infinite long straight conductor or solid conductor
(i) outside
(ii) on the surface and inside.

Q18. Define Capacitance. Drive expression for capacitance of a parallel plate capacitor having conducting slab between its plates.
Or
Define electric field at a point. Two-point charges, q and –q is placed at a distance ‘2a’ apart. Calculate the electric field at a point P situated at a distance along the perpendicular bisector of the line joining the charges.