Solved question paper for Physics Mar-2018 (PSEB Class 12th)
Solved Question Paper
Physics Mar-2018
PSEB • Class 12th • 1st • Mar-2018
Physics previous year question papers on BRpaper help students browse Punjab School Education Board PSEB 12th Class Question Papers for this subject in one place. If you are searching for PSEB 12th Physics old question papers, PSEB class 12 Physics board paper practice, or Punjab Board Class 12 Physics revision support, this section is meant to make subject-wise access quick and simple. Students can use the papers here to study the exam pattern, question style, marks distribution, and the kinds of numericals, derivations, and theory questions that often matter in preparation. It is also useful for spotting important questions, comparing chapter-wise trends, and practicing timed answers before the board exam. BRpaper is a student resource for browsing previous year papers and related exam preparation material where available. It is not the official website of Punjab School Education Board or any institution, and it does not publish official notices or academic updates.
Unit-1: Electrostatics
Electric Charges; charging by induction, basic properties of electric charge (addition of charges, quantisation of charges and their Conservation) Coulomb's law-force between two point charges, forces between multiple charges; superposition principle and cotineous charge distribution. Electrical field, electric field due to a point charge, electric field due to system of charge, physical significance of electric field, electric-field lines; electric dipole, electric field due to a dipole;(on its axis,on equatorial plane)physical significance of dipoles; torque on a dipole in uniform electric field.Electric field due to continuous charge distribution. Electric flux, statement of Gauss's theorem proof of Gauss’s theorem for a charge enclosed in sphere, and its applications to find electric field due to infinitely long straight wire, uniformly charged infinite thin plane sheet and uniformly charged thin spherical shell (Field inside and outside). Electric potential, potential difference, electric potential due to a point charge, potential due to an electric dipole with special cases for axis and equatorial plane and system of charges; equipotential surfaces,its properties,relation between field and potential electrical potential energy of a system of two point charges potential energy in external field and of electric dipole in an electrostatic field. Conductors and insulators, electrostatics of conductors, free charges and bound charges inside a conductor. Electrostatic shielding its uses, Dielectrics and electric polarisation, capacitors and capacitance, combination of capacitors in series and in parallel, capacitance of a parallel plate capacitor with and without dielectric medium between the plates, energy stored in a capacitor, Van de Graaf generator.
Unit-II: Current Electricity
Electric current, flow of electric charges in a metallic conductor, drift velocity, drift of electron mobility and their relation with electric current: Ohm's law, electrical resistance. V-1 characteristics (linear and non linear), electrical energy and power, electrical resistivity and conductivity. Carbon resistors, colour code for carbon resistors; series and parallel combinations of resistors; temperature dependence of resistance and resistivity.Internal resistance of a cell, potential difference and emf of cell, combination of cells in series and in parallel. Kirchhoff's laws and simple applications of Wheatstone bridge, meter bridge.Potentiometer-principle and its applications to measure potential difference and for comparing emf of two cells, measurement of internal resistance of a cell.
Unit-III: Magnetic Effects of Current and Magnetism
Concept of magnetic field. Oersted's experiment; Biot-savart law and its application to find mangnetic field on the axis of a current carrying circular loop, Ampere's circuital law (no proof) and its applications to infinitely long straight wire, straight and toroidal solenoids. Force on a moving charge in uniform magnetic and electric fields.Motion in a magnetic field,motion in combined electric and magnetic field (velocity selector) Cyclotron. Force on a current-carrying conductor in a uniform magnetic field Force between two parallel current-carrying conductors, definition of ampere. Torque experienced by a current loop in uniform magnetic field; moving coil galvanometersits current sensitivity and conversion to ammeter and voltmeter. Current loop as a magnetic dipole and its magnetic dipole moment. Magnetic dipole moment of a revolving electron. Magnetic field intensity due to a magnetic dipole (Bar magnet) along its axis and perpendicular to its axis. Torque on a magnetic dipole (bar magnet) in a uniform magnetic field; bar magnet as an equivalent solenoid, magnetic field lines; magnetism and Gauss’s law; Earth's magnetic field and magnetic elements, magnetisation and magnetic intensity, magnetic properties of materials, Para-, dia-and ferromagnetic substances with examples, Electromagnets and factors affecting their strengths. Permanent magnets.
Unit-IV: Electromagnetic Induction and Alternating Currents
Electromagnetic induction, Faraday's and henry experiments,magnetic flux,Faraday laws, induced emf and current, Lenz's Law and conservation of energy, motional emf, Eddy currents: Self and mutual inductance. Alternating current, peak and rms value of alternating current/voltage; reactance and impedances; phasors, ac applied across resistance, ac applied across inductor, as applied across capacitor, ac applied across LCR, LC oscillations, across inductor, ac applied across capacitor ,ac applLC oscillations, (qualitative treatment only), LCR series circuit resonance; power in AC circuit, wattless current. AC generator and transformer.
Unit-V: Electromagnetic Waves
Need for displacement current, Electromagnetic waves and their characteristics (qualitative ideas only). Transverse nature of lectromagnetic waves. Electromagnetic spectrum (Radio waves, Radio-microwaves, infra-red, visible, ultraviolet, X-rays, gamma rays) including elementary facts about their uses.
Unit-VI: Optics
Reflection of light, spherical mirrors, mirror formula. Refraction of light, total internal reflection and its applications, optical fibers, refraction at spherical surfaces, refraction by lens, lenses, thin lens formula/equation, lens-maker's formula. Magnification, power of a lens, combination of thin lenses in contact, combination of lens and mirror. Refraction and dispersion of light through a prism. Some natural phenomenon due to sunlight,Scattering of light-blue colour of the sky and reddish appearance of the sun at sunrise and sunset.Optical instruments: Human eye, image formation and accommodation, correction of eye defects (myopia, hypermetropia) using lenses. Microscopes and astronomical tetescopes (reflecting and refracting) and their magnifying powers. Waves optics : wave front and Huygens' Principle, reflection and refraction of plane wave at a plane surface using Huygens’ Principle, wave fronts. Proof of laws of reflection and refraction using Huygens ‘Principle. Interference Young's double hole experiment and expression for fringe width, coherent sources and incoherent addition of waves and sustained interference of light. Diffraction due to a single slit, width of central maximum. Resolving power of microscopes and astronomical telescopes. Polarisation, polarization by scattering and reflection, plane polarised light -Brewster's law, uses of plane polarised light and Polaroids.
Unit-VII: Dual nature of Matter and Radiation
Electron emission, Photoelectric effect, Hertz and Lenard's observations'; experimental study of photoelectric effect, and wave theory of light, Einstein's photoelectric equation, particle nature of light, the photon, Matter waves-wave nature of particles, de Broglie relation. Davission-Germer experiment (experimental details should be omitted; only conclusion should be explained).
Unit-VIII: Atoms & Nuclei
Alpha-particle scattering experiment; Rutherford's model of atom; Bohar modal of hydrogen atom, expression for radius, velocity and energy of electron in orbit, energy levels, line spectrum of hydrogen atom, atomic spectra,de-Broglie’s explanation of Bohr’ s second postulate of quantization. Composition and size of nucleus, atomic masses, isotopes, isobars; isotones. Radioactivity- alpha, beta and gamma particles/rays and their properties; radioactive decay law, alpha, beta and gamma decay. Mass-energy relation, mass-defect; binding energy per nucleon and its variation with mass number; nuclear fission, nuclear force,nuclear reactor, Nuclear energy.
Unit-XI: Electronic Devices
Classification of metal insulator and semiconductor, Energy bands in solids (qualitative idea only) conductor, insulators and Semiconductors;intrinsic and extrinsic semiconductors,p-n junction, semiconductor Diode-1-V characteristics in forward and reverse bias, diode as a rectifier, 1-V characteristics of LED, photodiode, solar cell and Zener diode, Zener diode as a voltage regulator. Junction transistor, transistor action; characteristics of a common emitter transistor: transistor as an amplifier (common emitter configuration) and oscillator, digital electronics and Logic gates (OR, AND, NOT, NAND and NOR). Transistor as a switch,integrated circuits.
Unit-X: Communication Systems
Elements of a communication system (block diagram only); basic terminology Used in Electronic Communication Systems, bandwidth of signals (speech, TV and digital data); bandwidth of transmission mediumPropagation of electromagnetic waves in the atmosphere, Sky and space wave propagation. Need for modulation. Production and detection of an amplitude modulated wave.
NOTE:- TOPICS GIVEN BELOW ARE IN PRESCRIBED SYLLABUS OF P.S.E.B BUT NOT MENTIONED IN BOOK SUBSCRIBED BY PSEB. SO THESE TOPICS ARE TO BE DONE WITH STUDENTS AND PAPER WILL INCLUDE THESE TOPICS AND QUESTIONS FROM THESE TOPICS WILL NOT CONSIDERED AS OUT OF SYLLABUS.
1. Electric flux
2. Potentiometer and its applications to measure potential difference
3. Magnetic field intensity due to a magnetic dipole (Bar magnet) along its axis and perpendicular to its axis.
4. Combinations of lens and mirror
5. Poor of laws of reflection and refraction using Huygens ‘Principle’.
6. Alpha-beta and gamma particles/rays and their properties
Solved Questions
Solved-
For alloys the value of temperature coefficient of resistance is very high. (True / False)
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
For alloys the value of temperature coefficient of resistance is very high. (True / False)
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Mar 2018
For alloys the value of temperature coefficient of resistance is very high. (True/False)
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__________was the first scientist who produced electromagnetic'waves in a laboratory
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
…………. was the first scientist who produced electromagnetic waves in a laboratory.
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Mar 2018
………… was the first scientist who produced electromagnetic waves in a laboratory.
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One atomic mass unit is equal to 1.67 x 10-27 g (Yes/No)
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Part-A
1. One atomic mass unit is equal to 1.67 x10-27 g. (Yes/No)
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Mar 2018
One atomic mass unit is equal to 1.67 X10-27 g. (Yes/No)
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Choose the correct option :
Electrical conductivity of a semi conductor-
(i) decreases with rise in its temperature.
(ii) increases with rise in its temperature.
(iii) does not changes with temperature.
(iv) first decreases and then increases with rise in temperature
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Choose the correct option:
\r\n\r\nElectrical conductivity of a semi conductor -
\r\n\r\n(i) decreases with rise in its temperature.
\r\n\r\n(ii) increases with rise in its temperature.
\r\n\r\n(iii) does not changes with temperature.
\r\n\r\n(iv) first decreases and then increases with rise in temperature
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Mar 2018
Choose the correct option:
\r\n\r\nElectrical conductivity of a semi conductor -
\r\n\r\n(i) decreases with rise in its temperature.
\r\n\r\n(ii) increases with rise in its temperature.
\r\n\r\n(iii) does not changes with temperature.
\r\n\r\n(iv) first decreases and then increases with rise in temperature.
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5 Define resonant frequency of LCR series circuit
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Define resonant frequency of LCR series circuit.
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Mar 2018
Define resonant frequency of LCR series circuit.
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What is the de-Broglie wavelength of an electron beam accelerated through apotential difference of 25V ?
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
What is the de-Broglie wavelength of an electron beam accelerated through a potential difference of 25V
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Mar 2018
Part-A
1. What is the de-Broglie wavelength of an electron beam accelerated through a potential difference of 25V ?
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Give the basic function of antenna.
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Give the basic function of antenna
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Mar 2018
Give the basic function of antenna.
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What are diamagnetic substances ?
Very Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
What are diamagnetic substances ?
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Mar 2018
What are diamagnetic substances ?
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How the eye of a person suffering from myopia can be corrected ? Explain with the help of ray diagram?
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
How the eye of a person suffering from myopia can be corrected ? Explain with the help of ray diagram.
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A wire with an area of cross-section as across its ends is 25V Calculate the drift velocity of electrons. Given the number density of electrons as 5 x 1020 electrons per cubic meter (e/m-3).
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
A wire with an area of cross-section as 10mm2 has a resistance of 512, when a potential difference across its ends is 25V. Calculate the drift velocity of electrons. Given the number density of electrons as 5x1020 electrons per cubic meter (e/m?).
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Mar 2018
A wire with an area of cross-section as 10mm? has a resistance of 512, when a potential difference across its ends is 25V. Calculate the drift velocity of electrons. Given the number density of electrons as 5x1020 electrons per cubic meter (e/m-').
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Explain ground wave propagation
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Explain ground wave propagation
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Mar 2018
Explain ground wave propagation.
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Write two uses of infrared rays.
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Write two uses of infrared rays.
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A capacitor of unknown value and an inductor of 0.1H and a resistor of 10(Omega) are connected in series to 220V 50Hz, ac source. It is found that the power factor of circuit is unity. Calculate the capacitance of capacitor and maximum amplitude of current
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
A capacitor of unknown value and an inductor of 0.1H and a resistor of 1022 are connected in series to a 220V, 50Hz ac source. It is found that the power factor of circuit is unity. Calculate the capacitance of capacitor and maximum amplitude of current.
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Wny does the thickness of depletion layer of pn-junction increases in the circuit diagram of reverse biasing.
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Why does the thickness of depletion layer of pn-junction increases in reverse biasing ? Draw the circuit diagram of reverse biasing.
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Mar 2018
Why does the thickness of depletion layer of pn-junction increases in reverse biasing ? Draw the circuit diagram of reverse biasing.
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A solenoid of length 50cm, having 100turns carries a current of 2.5A Find the magnatic field (B), (a) in the interior of the solenoid Given 4(pi) x10-7 WbA-1 m-1
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
A solenoid of length 50cm, having 100 turns carries a current of 2.5A. Find the magnetic field (B) (a) in the interior of the solenoid, (b) at one end of the solenoid. Given 4 = 4 T x 10-7 WbA-'m-!
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Mar 2018
A solenoid of length 50cm, having 100 turns carries a current of 2.5A. Find the magnetic field (B) (a) in the interior of the solenoid, (b) at one end of the solenoid. Given 4 = 4 T x 10-7 WbA-'m-!
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What is total internal reflection of light ? What are the two essential conditions for total intemal reflection to take Place ?
Short Answer Mar-2018 • PSEB Class 12th-
Mar 2018
What is total internal reflection of light ? What are the two essential conditions for total internal reflection to take place?
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Mar 2018
What is total internal reflection of light ? What are the two essential conditions for total internal reflection to take place ?
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Derive an expression for the energy stored in a capacitor. In what form is the energy stored in a charged capacitor?
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Derive an expression for the energy stored in a capacitor. In what form is the energy stored in a charged capacitor
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Mar 2018
Derive an expression for the energy stored in a capacitor. In what form is the energy stored in a charged capacitor ?
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Mar 2017
Derive an expression for energy stored in a capacitor. In which form energy is stored ?
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Define e.m.f. of a cell. How can you compare the emf of two cells using potentiometer ?
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
Define e.m.f. of a cell. How can you compare the emf of two cells using potentiometer ?
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(a) Wnte the truth table of AND gate
(b) Wnat is rectifier ? Explain the working of p-n junction diodp as a full-wave rectifier with the help of suitable circuit diagram.
or
A common emitter (CE) transistor has a current gain of 100. If emitter current is 8.08 mA, find the base and collector current.
Long Answer Mar-2018 • PSEB Class 12th -
With the help of labelled diagram, describe the principle, construction and working of a transformer.
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
With the help of labelled diagram, describe the principle, construction and working of a transformer.
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Mar 2018
With the help of labelled diagram, describe the principle, construction and working of a transformer.
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(a) State the laws of photo electric effect.
(b) Name a phenomenon which illustrates the particle nature of light
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
(a) State the laws of photo electric effect.
\r\n\r\n(b) Name a phenomenon which illustrates the particle nature of light.
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What is radioactivity ? State radioactive decay law and show that itis exponential in nature.
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
What is radioactivity ? State radioactive decay law and show that it is exponential in nature
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Mar 2018
What is radioactivity ? State radioactive decay law and show that it is exponential in nature.
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Mar 2017
State radioactive decay law. Prove that radioactive decay is exponantial in nature?
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With the help of ray diagram, describe the construction, working of a compound microscope when the final image is formed at least distance of distinct vision (D = 25cm). Derive an expression for its magnifying power (m).
or
(a) Two lenses of powers +15D and -5D are in contact with each other. What is the focal length of combination ?
(b) In the Young's double slit experiment, two slits 0.l25mm apart are illuminated by light of wavelength 4500A'. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima.
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
or
(a) Two lenses of powers +15D and -5D are in contact with each other. What is the focal length of combination ? (b) In the Young's double slit experiment, two slits 0.125mm apart are illuminated by light of wavelength 4500A°. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima. -
Mar 2018
Two lenses of powers +15D and -5D are in contact with each other. What is the focal length of combination ? (b) In the Young's double slit experiment, two slits 0.125mm apart are illuminated by light of wavelength 4500A°. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima.
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(a)Why two electric lines of force/field cannot intersect each other? '
(b) State Coulomb's law, explain its vector form and define S.I unit of electric charge. State two limitations of Coulomb's law.
or
(a) What is the shape of equipotential surface for a given point charge q.
(b) State Gauss's theorem. With the help of diagram, derive an .expression for the electric field intensity due to uniformly charged thin spherical shell at apoint (i) outside (ii) inside (iii) on the surface of the spherical shell.
Long Answer Mar-2018 • PSEB Class 12th -
(a) How can a galvanometer be converted into an ammeter ?
(b) Derive an expression for the force acting on a current carrying straight conductor kept in a uniform magnetic fie1d. Name the rule used to determine the direction of this force. Underwhat condition this force is maximum and zero?
Long Answer Mar-2018 • PSEB Class 12th-
Mar 2018
How can a galvanometer be converted into an ammeter ? (b) Derive an expression for the force acting on a current carrying straight conductor kept in a uniform magnetic field. Name the rule used to determine the direction of this force. Under what condition this force is maximum and zero ?
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(a) What is the essential condition for diffraction of light to occur ?
(b) What is polarisation of light ? Explain polarisation of light by reflection with the suitable diagram and hence derive Brewster's law.
or
(a) Why does the sky appear blue ?
(b) With the help of suitable diagram, sign conventions and assumptions, derive Lens Maker's formula for a convex lens.
Long Answer Mar-2018 • PSEB Class 12th
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01 Where can I find PSEB 12th Physics previous year question papers for practice?
This BRpaper subject page is meant to help students browse Punjab School Education Board Class 12 Physics previous year question papers in one subject-wise place. You can use these papers to practice board-style questions and review how Physics questions have been asked in past exams.
02 Does this page help with PSEB 12th Physics 1st semester question papers?
Yes, this page is organized for Physics under the 1st semester section, so students can use it to look for semester-wise paper access where available. It is useful for keeping Physics revision separate from other subjects while preparing.
03 How are previous year Physics papers different from PSEB Class 12 model or sample papers?
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04 Can I use these Physics papers to understand the exam pattern and marks distribution?
Yes, previous papers are helpful for understanding question style, numericals, derivations, theory balance, and broad marks distribution. Students should also check the latest Physics structure or model paper separately for the most current exam pattern guidance.
05 Are PSEB 12th Physics important questions available from previous year papers?
Previous year papers do not guarantee exact repeat questions, but they are useful for spotting frequently tested chapters, common numerical types, derivations, and long-answer styles. Many students use them to shortlist important revision topics before the exam.
06 How should I use old PSEB 12th Physics papers for last-minute revision?
Solve a few recent papers in timed conditions, then review which chapters, numericals, and derivations feel weak. This helps with pattern familiarity, speed, and focused revision using your textbook, class notes, and teacher guidance where needed.