## 12th Physics Important 2, 3, 5 Mark Questions - 2022 (Reduced Syllabus)

- 12th Physics - Public Exam 2022 - Model Question Paper 1 | ( English Medium ) - Download Here
- 12th Physics - Public Exam 2022 - Model Questions Papers | Sura ( TM & EM ) - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 3 | ( English Medium ) - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 4 | ( English Medium ) - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 1 | ( Tamil Medium ) - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 1 | ( English Medium ) - Download Here ( Full Reduced Portion)
- 12th Physics - Public Exam 2022 - Model Question Paper 2 | ( English Medium ) Mr.Mayakannan . M.Sc.,M.Phil. B.Ed.,PUS.,PG Physics - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 3 | ( English Medium ) Mr.Mayakannan . M.Sc.,M.Phil. B.Ed.,PUS.,PG Physics - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 1 | ( Tamil & English Medium ) - Download Here
- 12th Physics - Public Exam 2022 - Model Question Paper 1 | ( Tamil & English Medium ) - Download Here ( Full Reduced Portion)

## Volume 1

### 12th Physics Important 2 Marks

**Define ‘Electric dipole and dipole moment?****Define ‘electrostatic potential”.****Define ‘electric flux’. Mention its unit.****Define ‘capacitance’. Give its unit.****What is corona discharge?****State Coulomb’s law****Distinguish between drift velocity and mobility.****Define electrical resistivity. Mention its unit.****Define temperature coefficient of resistance. Mention its unit.****Distinguish electric power and electric energy?****What is the Thomson effect?****What is the Peltier effect?****Define magnetic flux. Mention its unit.****State Coulomb’s inverse law in magnetism.****State Ampere’s circuital law.****State Flemmings left hand rule****How is a galvanometer converted into i)ammeter ii) voltmeter****State Fleming’s right-hand rule.****Mention the ways of producing induced emf.****Define electric resonance.****How will you define Q-factor?****Write down the integral form of modified Ampere’s circuital law.****What is meant by Fraunhofer lines?****Why are em waves non-mechanical?**

### 12th Physics Important 3 Marks

**Derive an expression for the torque experienced by a dipole due to a uniform electric field.****Derive an expression for electrostatic potential due to a point charge.****Obtain the expression for capacitance for a parallel plate capacitor.****Obtain the expression for energy stored in the parallel plate capacitor.****Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.****State and explain Kirchhoff’s rules.****Explain the equivalent resistance of a series and parallel resistor network****Explain the determination of the internal resistance of a cell using a voltmeter.****Find the magnetic induction due to a long straight conductor using Ampere’s circuital law.****Give an account of magnetic Lorentz force.****Explain how a galvanometer is converted into an ammeter.****Explain how a galvanometer is converted into a voltmeter.****How will you induce an emf by changing the area enclosed by the coil?****Mention the various energy losses in a transformer.****Find out the phase relationship between voltage and current in a pure resistive circuit.****Assuming that the length of the solenoid is large when compared to its diameter, find the equation for its inductance****What are emission spectra? Give their types.****What are absorption spectra? Give their types.****Write down the properties of electromagnetic waves**

### 12th Physics Important 5 Marks

**Calculate the electric field due to a dipole on its axial line.****Derive an expression for electrostatic potential due to an electric dipole.****Obtain the expression for electric field due to an infinitely long charged wire.****Derive the expression for resultant capacitance, when capacitors are connected in series and in parallel.****Explain in detail the construction and working of a Van de Graaff generator.****Describe the microscopic model of current and obtain the general form of Ohm’s law.****Obtain the condition for bridge balance in Wheatstone’s bridge****Deduce the relation for the magnetic induction at a point due to an infinitely long straight conductor carrying current.****Obtain an expression for the force between two long parallel current-carrying conductors.****Obtain an expression for the force on a current-carrying conductor placed in a magnetic field.****Show mathematically that the rotation of a coil in a magnetic field over one rotation induces an alternating emf of one cycle.****Explain the construction and working of the transformer.****Find out the phase relationship between voltage and current in a pure inductive circuit.****Derive an expression for the phase angle between the applied voltage and current in a series RLC circuit.**

## Volume 2

### 12th Physics Important 2 Marks

**State the laws of refraction (OR) Snells law.****What is critical angle and total internal reflection?****What is Rayleigh’s scattering?****Why does the sky appear blue?****What is the reason for the reddish appearance of the sky during sunset and sunrise?****Why do clouds appear white?****What is Huygens’ principle?****What is the bandwidth of the interference pattern?****What is plane polarised, unpolarized and partially polarised light?****State Brewster’s law****Define the work function of a metal. Give its unit.****What is the photoelectric effect?****How will you define threshold frequency?****Define stopping potential.****What is meant by excitation energy.****Define the ionization energy and ionization potential.****Define impact parameter.****What is mass defect?****What is binding energy of a nucleus? Give its expression.****Calculate the energy equivalent of 1 atomic mass unit.****What is mean life of nucleus? Give the expression.****What is meant by activity or decay rate? Give its unit.****Define curie.****What do you mean by doping?****Distinguish between intrinsic and extrinsic semiconductors.****What is rectification?****What is an integrated circuit?****What is modulation?****Define center frequency or resting frequency in frequency modulation.**

### 12th Physics Important 3 Marks

**Derive the relation between f and R for a spherical mirror.****What is an optical path? Obtain the equation for the optical path of a medium of thickness d and refractive index n.****Obtain the equation for apparent depth.****Obtain the equation for the critical angle****Mention the differences between interference and diffraction****State and obtain Malus’ law****List the uses of polaroids.****What is the angle of polarisation and obtain the equation for angle of polarisation?****State and obtain Brewster’s law.****List out the laws of the photoelectric effect.****Give the construction and working of photoemissive cell.****Derive an expression for de Broglie wavelength of electrons.****Write the applications fo photocells.****Write the properties of cathode rays.****Write down the postulates of Bohr atom model.****Derive the energy expression for hydrogen atoms using the Bohr atom model.****What are the properties of nuclear force?****Discuss the alpha decay process for example.****Discuss the gamma decay process for an example.****Discuss the properties of neutrino and its role in beta decay****Transistor functions as a switch. Explain.****State and prove De Morgan’s First and Second theorems.****What are the advantages and limitations of FM?**

### 12th Physics Important 5 Marks

**Derive the mirror equation and the equation for lateral magnification.****Describe Fizeau’s method to determine the speed of light.****Obtain the lens maker’s formula and mention its significance.****Derive the equation for the angle of deviation produced by a prism and thus obtain the equation for the refractive index of the material of the prism****What is dispersion? Obtain the equation for the dispersive power of a medium.****Obtain the equation for bandwidth in Young’s double-slit experiment.****Discuss a simple microscope and obtain the equations for magnification for near point focusing and normal focusing.****Obtain Einstein’s photoelectric equation with the necessary explanation.****Describe briefly Davisson – the Germer experiment which demonstrated the wave nature of electrons****Explain the J.J. Thomson experiment to determine the specific charge of electrons.****Discuss the spectral series of the hydrogen atoms.****Obtain the law of radioactivity.****Obtain an expression for the radius and velocity of the electron in the nth orbit.****Draw the circuit diagram of a half-wave rectifier and explain its working.****Explain the construction and working of a full-wave rectifier.**