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

## 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

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
7. Distinguish between drift velocity and mobility.
8. Define electrical resistivity. Mention its unit.
9. Define temperature coefficient of resistance. Mention its unit.
10. Distinguish electric power and electric energy?
11. What is the Thomson effect?
12. What is the Peltier effect?
13. Define magnetic flux. Mention its unit.
14. State Coulomb’s inverse law in magnetism.
15. State Ampere’s circuital law.
16. State Flemmings left hand rule
17. How is a galvanometer converted into i)ammeter ii) voltmeter
18. State Fleming’s right-hand rule.
19. Mention the ways of producing induced emf.
20. Define electric resonance.
21. How will you define Q-factor?
22. Write down the integral form of modified Ampere’s circuital law.
23. What is meant by Fraunhofer lines?
24. Why are em waves non-mechanical?

### 12th Physics Important 3 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.
5. Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
6. State and explain Kirchhoff’s rules.
7. Explain the equivalent resistance of a series and parallel resistor network
8. Explain the determination of the internal resistance of a cell using a voltmeter.
9. Find the magnetic induction due to a long straight conductor using Ampere’s circuital law.
10. Give an account of magnetic Lorentz force.
11. Explain how a galvanometer is converted into an ammeter.
12. Explain how a galvanometer is converted into a voltmeter.
13. How will you induce an emf by changing the area enclosed by the coil?
14. Mention the various energy losses in a transformer.
15. Find out the phase relationship between voltage and current in a pure resistive circuit.
16. Assuming that the length of the solenoid is large when compared to its diameter, find the equation for its inductance
17. What are emission spectra? Give their types.
18. What are absorption spectra? Give their types.
19. Write down the properties of electromagnetic waves

### 12th Physics Important 5 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.
6. Describe the microscopic model of current and obtain the general form of Ohm’s law.
7. Obtain the condition for bridge balance in Wheatstone’s bridge
8. Deduce the relation for the magnetic induction at a point due to an infinitely long straight conductor carrying current.
9. Obtain an expression for the force between two long parallel current-carrying conductors.
10. Obtain an expression for the force on a current-carrying conductor placed in a magnetic field.
11. Show mathematically that the rotation of a coil in a magnetic field over one rotation induces an alternating emf of one cycle.
12. Explain the construction and working of the transformer.
13. Find out the phase relationship between voltage and current in a pure inductive circuit.
14. 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

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 the sky appear blue?
5. What is the reason for the reddish appearance of the sky during sunset and sunrise?
6. Why do clouds appear white?
7. What is Huygens’ principle?
8. What is the bandwidth of the interference pattern?
9. What is plane polarised, unpolarized and partially polarised light?
10. State Brewster’s law
11. Define the work function of a metal. Give its unit.
12. What is the photoelectric effect?
13. How will you define threshold frequency?
14. Define stopping potential.
15. What is meant by excitation energy.
16. Define the ionization energy and ionization potential.
17. Define impact parameter.
18. What is mass defect?
19. What is binding energy of a nucleus? Give its expression.
20. Calculate the energy equivalent of 1 atomic mass unit.
21. What is mean life of nucleus? Give the expression.
22. What is meant by activity or decay rate? Give its unit.
23. Define curie.
24. What do you mean by doping?
25. Distinguish between intrinsic and extrinsic semiconductors.
26. What is rectification?
27. What is an integrated circuit?
28. What is modulation?
29. Define center frequency or resting frequency in frequency modulation.

### 12th Physics Important 3 Marks

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

### 12th Physics Important 5 Marks

1. Derive the mirror equation and the equation for lateral magnification.
2. Describe Fizeau’s method to determine the speed of light.
3. Obtain the lens maker’s formula and mention its significance.
4. 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
5. What is dispersion? Obtain the equation for the dispersive power of a medium.
6. Obtain the equation for bandwidth in Young’s double-slit experiment.
7. Discuss a simple microscope and obtain the equations for magnification for near point focusing and normal focusing.
8. Obtain Einstein’s photoelectric equation with the necessary explanation.
9. Describe briefly Davisson – the Germer experiment which demonstrated the wave nature of electrons
10. Explain the J.J. Thomson experiment to determine the specific charge of electrons.
11. Discuss the spectral series of the hydrogen atoms.
12. Obtain the law of radioactivity.
13. Obtain an expression for the radius and velocity of the electron in the nth orbit.
14. Draw the circuit diagram of a half-wave rectifier and explain its working.
15. Explain the construction and working of a full-wave rectifier.

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