# ISC Class 12 Physics Marking Scheme

The 12th class examination is something which has entirely different impact and importance when compared to any other class. The class 12th percentage is something which is asked everywhere, to get admissions into any college, or in any job interview; you cannot skip your class 12th percentage.

ISC and CBSE board have some similarities and some differences. CBSE approves both Hindi and English as the language of instruction, but ISC does not recommend Hindi. In ISC, internal assessments are vital, and practical tests are aggregated with the overall scores. Moreover, CBSE is recognized by the Indian government, and ISC is not. However, certificates provided by both of them are globally valid.

Class 12 Physics is a subject which requires you to remember derivations, theorems, diagrams and of course the formulas to solve the problems. Therefore, preparation according to the marks, has a unique importance and can prove to be really effective.

ISC Class 12 Physics syllabus consists of 9 units and the question paper is of 70 marks as follows.

 Unit Topic Marks 1 Electrostatics 14 2 Current Electricity 3 Magnetic Effect of Current and Magnetism 16 4 Electromagnetic induction and Alternating Current 5 Electromagnetic Waves 6 Optics 20 7 Dual nature of Matter and Radiations 13 8 Atoms and Nuclei 9 Electronic Devices 7 Total 70

1. Electrostatics

Under Electrostatics, we have two chapters namely:

Electric charges and fields

This chapter includes Electric charges; conservation and quantisation of charge, Coulomb’s law; superposition principle and continuous charge distribution..

Electrostatic Potential and Capacitance

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.

2. Current Electricity

Under Second unit, we have following concepts like mechanism of flow of current in conductors. Mobility, drift velocity and its relation with electric current; Ohm’s law and its proof, resistance and resistivity and their relation to drift velocity of electrons; V-I characteristics (linear and non-linear), electrical energy and power, electrical resistivity and conductivity. Temperature dependence of resistance and resistivity.

3. Magnetic Effects of Current and Magnetism

Magnetic effects of Current and Magnetism includes two chapters namely:

Moving Charges and Magnetism

• Concept of magnetic field, Oersted’s experiment.
• Biot – Savart law and its application.

Magnetism and Matter

Magnetism and Matter involves current loop as a magnetic dipole, its magnetic dipole moment, magnetic dipole moment of a revolving electron, magnetic field intensity due to a magnetic dipole (bar magnet) on the axial line and equatorial line.

4. Electromagnetic Induction and Alternating Current

This unit also consists of two chapters namely:

Electromagnetic Induction

This involves Faraday’s laws, induced emf and current; Lenz’s Law, eddy currents. Self-induction and mutual induction. Transformer.

Alternating Current

Peak value, mean value and RMS value of alternating current/voltage; their relation in sinusoidal case; reactance and impedance; LC oscillations (qualitative treatment only).

5. Electromagnetic Waves

Basic idea of displacement current. Electromagnetic waves, their characteristics, their transverse nature (qualitative ideas only).

Complete electromagnetic spectrum starting from radio waves to gamma rays: elementary facts of electromagnetic waves and their uses.

6. Optics

This Unit consists of two chapters namely:

Ray Optics

Ray Optics: Reflection of light by spherical mirrors, mirror formula, refraction of light at plane surfaces, total internal reflection and its applications, optical fibres, refraction at spherical surfaces, lenses, thin lens formula, lens maker’s formula.

Wave Optics

Wave front and Huygen’s principle. Proof of laws of reflection and refraction using Huygen’s principle.

7. Dual Nature of Matter and Radiation

This unit consists of Dual nature of radiation. Wave particle duality; photoelectric effect, Hertz and Lenard’s observations; Einstein’s photoelectric equation – particle nature of light.

8. Atoms and Nuclei

Alpha-particle scattering experiment; Rutherford’s atomic model; Bohr’s atomic model, energy levels, hydrogen spectrum.

Composition and size of nucleus. Mass-energy relation, mass defect; binding energy per nucleon and its variation with mass number; Nuclear reactions, nuclear fission and nuclear fusion.

9. Electronic Devices

Semiconductor Electronics: Materials, Devices and Simple Circuits. Energy bands in conductors, semiconductors and insulators (qualitative ideas only).

Semiconductor diode: I-V characteristics in forward and reverse bias, diode as a rectifier; Special types of junction diodes: LED, photodiode and solar cell.

Everybody prepares for examination, but intelligent preparation always outputs the better result, and it can only be achieved by preparing according to ISC Class 12 Physics marking scheme.