Bihar Board 12th Physics Marks Distribution
The Physics paper is of total of 70 marks consisting of 3 hours 15 minutes of time duration. The syllabus shown in the table below is as per the official Bihar School Examinations Board (BSEB) is in both the medium hindi as well as english.
|Unit||इकाई का नाम||Marks Weightage|
|Unit 1: Electrostatics||इकाई1: विद्युत् – स्थैतिकी||08|
|Unit 2: Current Electricity||इकाई2: विद्युत धारा||07|
|Unit 3: Magnetic effect of current and Magnetism||इकाई3: धारा का चुम्बकीय प्रभाव तथा चुम्बकत्व||08|
|Unit 4: Electromagnetic Induction and Alternating Current||इकाई4: विद्युत् चुम्बकीय प्रेरण तथा प्रयवर्ती धारा||08|
|Unit 5: Electromotive Waves||इकाई5: विद्युत् चुम्बकीय तरंगे||03|
|Unit 6: Optics||इकाई6: प्रकाशिकी||14|
|Unit 7: Dual Nature of Matter||इकाई7: विकिरण तथा द्रव्य की द्वैत प्रकृति||04|
|Unit 8: Atoms and Nuclei||इकाई8: परमाणु तथा नाभिक||06|
|Unit 9: Electronic Devices||इकाई9: इलेक्ट्रॉनिक यन्त्र||07|
|Unit 10: Communication Systems||इकाई10: संचार व्यवस्था||07|
Students will get more clarity about the BSEB 12th भौतिक विज्ञान Exam Paper Pattern when they start solving the Bihar Board Class 12 Previous Year Question Papers.
Bihar Board Class 12 Physics Syllabus 2020-21
Have a look at the chapter wise detailed Bhautik VigyanSyllabus of Class 12 of Bihar Board.
Unit 1: Electrostatics
- Electric Charges, Conservation of charge, Coulomb’s law-force between two point charges, forces between multiple charges; superposition principle and continuous charge distribution.
- Electric field, electric field due to a point charge, electric field lines, electric dipole, electric field due to a dipole, torque on a dipole in uniform electric field.
- Electric flux, Statement of Gauss’s theorem and its applications to find field due to an infinitely long straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell (field inside and outside).
- Electric potential, potential difference, electric potential due to a point charge, a dipole and system of charges; equipotential surfaces, electrical potential energy of a system of two point charges and of electric dipole in an electrostatic field.
- Conductors and insulators, free charges and bound charges inside a conductor. 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 Graaff Generator.
Unit 2: Current Electricity
- Ohm’s law, electrical resistance, V-I characteristics (linear and nonlinear), 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.
- Internal resistance of a cell, potential difference and emf of a cell,combination of cells in series and in parallel. Kirchhoff’s laws and simple applications. Wheatstone bridge, metre 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 3: Magnetic effect of current and Magnetism
- Concept of magnetic field, Oersted’s experiment.
- Biot – Savart law and its application to current carrying circular loop.
- Ampere’s law and its applications to infinitely long straight wire. Straight and toroidal solenoid.
- Force on a moving charge in a uniform magnetic and electric fields, 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 galvanometer-its 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; Earth’s magnetic field and magnetic elements.
- Para-, dia- and ferro – magnetic substances, with examples. Electromagnets and factors affecting their strengths. Permanent magnets.
Unit 4: Electromagnetic Induction and Alternating Current
- Electromagnetic induction; Faraday’s law, induced emf and current; Lenz’s Law, Eddy currents.
- Self and mutual induction, Need for replacement current.
- Alternating currents, peak and rms value of alternating current/voltage; reactance and impedance; LC oscillations (qualitative treatment only), LCR series circuit, resonance; power in AC circuits, wattless current.
- AC generator and transformer.
Unit 5: Electromotive Waves
- Electromagnetic waves, their characteristics, their transverse nature (qualitative ideas only)
- Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays) including elementary facts about their uses.
Unit 6: Optics
- Reflection of light, spherical mirrors, mirror formula. Refraction of light, total internal reflection and its applications, optical fibres, refraction at spherical surfaces, lenses, thin lens formula, lensmaker’s formula. Magnification, power of a lens, combination of thin lenses in contact.
- Refraction and dispersion of light through a prism.
- 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, presbyopia and astigmatism) using lenses. Microscopes and astronomical telescopes (reflecting and refracting) and their magnifying powers.
- Wave optics: Wavefront and Huygens principle, reflection and refraction of plane waves at a plane surface using wave fronts. Proof of laws of reflection and refraction using Huygens principle. Interference Young’s double slit experiment and expression for fringe width, coherent sources and sustained interference of light. Diffraction due to a single slit, width of central maximum. Resolving power of microscopes and astronomical telescopes. Polarisation, plane polarised light Brewster’s law, uses of plane polarised light and Polaroids.
Unit 7: Dual Nature of Matter
- Photoelectric effect, Hertz and Lenard’s observations; Einstein’s photoelectric equation-particle nature of light.
- Matter waves-wave nature of particles, de Broglie relation.
- Davisson-Germer experiment
Unit 8: Atoms and Nuclei
- Alpha-particle scattering experiment; Rutherford’s model of atom; Bohr model, energy levels, hydrogen spectrum.
- Composition and size of nucleus, atomic masses, isotopes, isobars; isotones. Radioactivity Alpha, beta and gamma particles/rays and their properties; radioactive decay law.
- Mass-energy relation, mass defect; binding energy per nucleon and its variation with mass number; nuclear fission, nuclear fusion.
Unit 9: Electronic Devices
- Semiconductor diode – I-V characteristics in forward and reverse bias, diode as a rectifier.
- I-V characteristics of transistor, transistor as an amplifier (common emitter configuration), basic idea of analog and digital signals, Logic gates (OR, AND, NOT, NAND and NOR), transistor as a switch.
Unit 10: Communication Systems
- Elements of a communication system (block diagram only); bandwidth of signals (speech, TV and digital data); bandwidth of transmission medium.
- Propagation of electromagnetic waves in the atmosphere, sky and space wave propagation, satellite communication.
- Need for modulation, amplitude modulation.
- Production and detection of an amplitude modulated wave.