12th Physics Most Important 2 Mark Questions 2026 (Complete Revision Guide)

⚡ Lesson 1: Electrostatics

1. State Coulomb's Law in electrostatics.
2. Define electric field. Mention its unit.
3. Differentiate Coulomb force and gravitational force.
4. Define electric potential.
5. Define the term electric dipole moment. Mention its unit.
6. Define electric flux. Mention its unit.
7. State Gauss law.
8. Define capacitance of a conductor. Mention its unit.
9. Define action of points (or) corona discharge.
10. Differentiate non-polar and polar molecules.
11. Define electrostatic potential energy.
12. The electric field lines never intersect. Justify.
13. Why is it safer to sit inside a bus during lightning?

⚡ Lesson 2: Current Electricity

1. Define drift velocity. Mention its unit.
2. What is current density? Mention its unit.
3. What is Seebeck effect?
4. State Joule's law of heating.
5. Define temperature coefficient.
6. What is Thomson effect?
7. Define mobility. Mention its unit.
8. State Ohm's law.
9. What is Peltier effect?
10. Why is current a scalar quantity?
11. Derive the relation P = VI.

🧲 Lesson 3: Magnetism

1. Define magnetic flux. Mention its unit.
2. Define magnetic dipole moment.
3. State Coulomb's inverse law.
4. What is magnetic susceptibility?
5. State Biot–Savart's law.
6. State Ampere's circuital law.
7. What is meant by hysteresis?
8. Define ampere.
9. State Fleming's left hand rule.
10. State tangent law.
11. What is current sensitivity? How is it increased?
12. Write the limitations of cyclotron.

⚡ Lesson 4: EM Induction & AC

1. State Faraday's laws of electromagnetic induction.
2. State Lenz's law.
3. State Fleming's right hand rule.
4. Mention the ways of producing induced EMF.
5. What is meant by mutual induction?
6. Differentiate step-up and step-down transformers.
7. Define RMS value of an AC.
8. Define Q-factor.

📡 Lesson 5: EM Waves

1. What is displacement current?
2. What are electromagnetic waves?
3. What are Fraunhofer lines?
4. Why are electromagnetic waves non-mechanical waves?
5. Give the uses of (i) Infrared radiation (ii) Ultraviolet radiation.

🔆 Lesson 6: Ray Optics

1. State Snell's law and the laws of refraction.
2. Why do stars twinkle?
3. What is power of a lens? Mention its unit.
4. What is angle of minimum deviation?
5. What is dispersion?
6. State Rayleigh's scattering law.
7. Why does the sky appear blue?
8. What is the reason for reddish appearance of sky during sunset and sunrise?
9. Why do clouds appear white?

🌈 Lesson 7: Wave Optics

1. Define wave front.
2. State Huygen's principle.
3. What are coherent sources?
4. What is Rayleigh's criterion?
5. State Malus' law.
6. What is double refraction?
7. What is near point and normal focusing?

⚛️ Lesson 8: Dual Nature

1. Why do metals have a large number of electrons?
2. Define work function of a metal. Give its unit.
3. What is photoelectric effect?
4. How will you define threshold frequency?
5. State de Broglie hypothesis.
6. Define stopping potential.
7. What is surface barrier?
8. What is Bremsstrahlung?
9. Write the applications of photocell.

☢️ Lesson 9: Atomic Physics

1. What is meant by excitation energy and excitation potential?
2. Define ionization energy and ionization potential.
3. What is distance of closest approach?
4. Define impact parameter.
5. Define atomic mass unit.
6. What is mass defect?
7. What is meant by radioactivity?
8. Define mean life. Give its expression.
9. What is half life? Give its expression.
10. Define Curie.

🔌 Lesson 10: Electronics

1. Define forbidden energy gap.
2. What do you mean by doping?
3. Distinguish between intrinsic and extrinsic semiconductor.
4. What is leakage current in a diode?
5. Give the Barkhausen conditions for oscillations.
6. What is meant by biasing? Mention its types.
7. What are universal gates? Why are they called so?
8. What is rectification?
9. Define skip distance.
10. What is skip zone?
11. Draw the circuit diagram of CB and CE configuration.

🚀 Lesson 11: Recent Developments

1. Give any two examples for nano in nature.
2. Why is steel preferred in making robots?
3. What are black holes?
4. What are subatomic particles?

Quick Revision Tip

Practice these 2-mark questions regularly. Focus on definitions, laws, and units. Draw diagrams where applicable for better understanding.