12TH PHYSICS VOLUME 1 & 2 PUBLIC EXPECTED IMPORTANT QUESTIONS
UNIT – 1 – ELECTROSTATICS
BOOK BACK TWO MARKS
1. Define ‘Electric dipole’and dipole moment?
2. Define ‘electrostatic potential”.
3. Define ‘electric flux’. Mention its unit.
4. Define ‘capacitance’. Give its unit.
5. What is corona discharge?
6. State Coulomb’s law.
BOOK BACK THREE MARKS
1. Derive an expression for the torque experienced by a dipole due to a uniform electric field.
2. Derive an expression for electrostatic potential due to a point charge.
3. Obtain the expression for capacitance for a parallel plate capacitor.
4. Obtain the expression for energy stored in the parallel plate capacitor.
BOOK BACK FIVE MARKS
1. Calculate the electric field due to a dipole on its axial line.
2. Derive an expression for electrostatic potential due to an electric dipole.
3. Obtain the expression for electric field due to an infinitely long charged wire.
4. Derive the expression for resultant capacitance, when capacitors are connected in series and in parallel.
5. Explain in detail the construction and working of a Van de Graaff generator.
UNIT – 2 – CURRENT ELECTRICITY
BOOK BACK TWO MARKS
1. Distinguish between drift velocity and mobility.
2. Define electrical resistivity. Mention its unit.
3. Define temperature coefficient of resistance. Mention its unit.
4. Distinguish electric power and electric energy?
5. What is Thomson effect?
6. What is Peltier effect?
BOOK BACK THREE MARKS
1. Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
2. State and explain Kirchhoff’s rules.
3. Explain the equivalent resistance of a series and parallel resistor network
4. Explain the determination of the internal resistance of a cell using voltmeter.
BOOK BACK FIVE MARKS
1. Describe the microscopic model of current and obtain general form of Ohm’s law.
2. Obtain the condition for bridge balance in Wheatstone’s bridge.
UNIT – 3 – MAGNETISM AND MAGNETIC EFFECTS OF ELECTRIC CURRENT
BOOK BACK TWO MARKS
1. Define magnetic flux. Mention its unit.
2. State Coulomb’s inverse law in magnetism.
3. State Ampere’s circuital law.
4. State flemmings left hand rule
5. How is a galvanometer converted into i)ammeter ii) voltmeter
BOOK BACK THREE MARKS
1. Find the magnetic induction due to a long straight conductor using Ampere’s circuital law.
2. Give an account of magnetic lorrentz force.
3. Explain how galvanometer is converted into an ammeter.
4. Explain how galvanometer is converted into an voltmeter.
BOOK BACK FIVE MARKS
1. Deduce the relation for the magnetic induction at a point due to an infinitely long straight conductor carrying current.
2. Obtain an expression for the force between two long parallel current carrying conductor.
3. Obtain an expression for the force on a current carrying conductor placed in a magnetic field.
UNIT - 4 – ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENT
BOOK BACK TWO MARKS
1. State Fleming’s right hand rule.
2. Mention the ways of producing induced emf.
3. Define electric resonance.
4. How will you define Q-factor?
BOOK BACK THREE MARKS
1. How will you induce an emf by changing the area enclosed by the coil?
2. Mention the various energy losses in a transformer.
3. Find out the phase relationship between voltage and current in a pure resistive circuit.
4. Assuming that the length of the solenoid is large when compared to its diameter, find the equation for its inductance.
BOOK BACK FIVE MARKS
1. Show mathematically that the rotation of a coil in a magnetic field over one rotation induces an alternating emf of one cycle.
2. Explain the construction and working of transformer.
3. Find out the phase relationship between voltage and current in a pure inductive circuit.
4. Derive an expression for phase angle between the applied voltage and current in a series RLC circuit.
UNIT - 5 – ELECTROMAGNETIC WAVES
BOOK BACK TWO MARKS
1. Write down the integral form of modified Ampere’s circuital law.
2. What is meant by Fraunhofer lines?
3. Why are em waves non mechanical?
BOOK BACK THREE MARKS
1. What are emission spectra? Give their types.
2. What are absorption spectra? Give their types.
3. Write down the properties of electromagnetic waves.
VOLUME II EXPECTED IMPORTANT QUESTION
UNIT - 6 – RAY OPTICS
BOOK BACK TWO MARKS
1. State the laws of refraction (OR) Snells law.
2. What is critical angle and total internal reflection?
3. What is Rayleigh’s scattering?
4. Why does sky appear blue?
5. What is the reason for reddish appearance of sky during sunset and sunrise?
6. Why does clouds appear white?
BOOK BACK THREE MARKS
1. Derive the relation between f and R for a spherical mirror.
2. What is optical path? Obtain the equation for optical path of a medium of thickness
d and refractive index n.
3. Obtain the equation for apparent depth.
4. Obtain the equation for critical angle.
BOOK BACK FIVE MARKS
1. Derive the mirror equation and the equation for lateral magnification.
2. Describe the Fizeau’s method to determine speed of light.
3. Obtain lens maker’s formula and mention its significance.
4. Derive the equation for angle of deviation produced by a prism and thus obtain the equation for refractive index of material of the prism
5. What is dispersion? Obtain the equation for dispersive power of a medium.
UNIT - 7 – WAVE OPTICS
BOOK BACK TWO MARKS
1. What is Huygens’ principle?
2. What is bandwidth of interference pattern?
3. What are plane polarised, unpolarised and partially polarised light?
4. State Brewster’s law.
BOOK BACK THREE MARKS
1. Mention the differences between interference and diffraction
2. State and obtain Malus’ law
3. List the uses of polaroids.
4. What is angle of polarisation and obtain the equation for angle of polarisation. (OR)
State and obtain Brewster’s law.
BOOK BACK FIVE MARKS
1. Obtain the equation for bandwidth in Young’s double slit experiment.
2. Discuss about simple microscope and obtain the equations for magnification for near point focusing and normal focusing.
UNIT - 8 – DUAL NATURE OF RADIATION AND MATTER
BOOK BACK TWO MARKS
1. Define work function of a metal. Give its unit.
2. What is photoelectric effect?
3. How will you define threshold frequency?
4. Define stopping potential.
BOOK BACK THREE MARKS
1. List out the laws of photoelectric effect.
2. Give the construction and working of photo emissive cell.
3. Derive an expression for de Broglie wavelength of electrons.
4. Write the applications fo photo cells.
BOOK BACK FIVE MARKS
1. Obtain Einstein’s photoelectric equation with necessary explanation.
2. Describe briefly Davisson – Germer experiment which demonstrated the wave nature of electrons.
UNIT - 9 – ATOMIC AND NUCLEAR PHYSICS
1. What is meant by excitation energy.
2. Define the ionization energy and ionization potential.
3. Define impact parameter.
4. What is mass defect?
5. What is binding energy of a nucleus? Give its expression.
6. Calculate the energy equivalent of 1 atomic mass unit.
7. What is mean life of nucleus? Give the expression.
8. What is meant by activity or decay rate? Give its unit.
9. Define curie.
BOOK BACK THREE MARKS
1. Write the properties of cathode rays.
2. Write down the postulates of Bohr atom model.
3. Derive the energy expression for hydrogen atom using Bohr atom model.
4. What are the properties of nuclear force.
5. Discuss the alpha decay process with example.
6. Discuss the gamma decay process with example.
7. Discuss the properties of neutrino and its role in beta decay.
BOOK BACK FIVE MARKS
1. Explain the J.J. Thomson experiment to determine the specific charge of electron.
2. Discuss the spectral series of hydrogen atom.
3. Obtain the law of radioactivity.
4. Obtain an expression for the radius and velocity of the electron in the nth orbit.
UNIT - 10 – SEMICONDUCTOR ELECTRONICS
BOOK BACK TWO MARKS
1. What do you mean by doping?
2. Distinguish between intrinsic and extrinsic semiconductors.
3. What is rectification?
4. What is an integrated circuit?
5. What is modulation?
6. Define centre frequency or resting frequency in frequency modulation.
BOOK BACK THREE MARKS
1. Transistor functions as a switch. Explain.
2. State and prove De Morgan’s First and Second theorems.
3. What are the advantages and limitations of FM?
BOOK BACK FIVE MARKS
1. Draw the circuit diagram of a half wave rectifier and explain its working.
2. Explain the construction and working of a full wave rectifier.
PREPARED BY S. MAHESWARI M.Sc, B.Ed.,
H.O.D. DEPARTMENT OF PHYSICS,
SVBMHSS SCHOOL, SAKKARAMPALAYAM.
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