Class 12 Physics Imp Qs 2027 — Chapter-wise VSA, SA &#038…

MP Board Class 12 Physics Important Questions 2027 — Physics carries 70 marks in the MP Board Class 12 exams and is divided into 9 chapters covering Electrostatics, Current Electricity, Magnetism, Electromagnetic Induction, EM Waves, Optics, Dual Nature, Atoms & Nuclei, and Semiconductor Devices. This compilation features chapter-wise important questions across Very Short Answer (1 mark), Short Answer (2-3 marks), and Long Answer (4-5 marks) categories — designed to help you target high-weightage topics and score 90%+ in the 2027 board exams.

⚡ Chapter 1: Electrostatic Potential & Capacitance

Very Short Answer Questions (1 Mark)

  • Q1. Define electric potential at a point. Write its SI unit.
  • Q2. What is the dielectric constant of a conductor?
  • Q3. Write the relation between electric field and potential gradient.
  • Q4. What is the net capacitance when two capacitors are connected in series?

Short Answer Questions (2-3 Marks)

  • Q5. Derive the expression for potential due to a point charge at a distance r.
  • Q6. Explain the effect of inserting a dielectric slab on the capacitance of a parallel plate capacitor.
  • Q7. Two capacitors of 4 µF and 6 µF are connected in series across a 12 V battery. Find the charge on each capacitor.
  • Q8. Define equipotential surface. Draw the equipotential surfaces for a point charge.

Long Answer Questions (4-5 Marks)

  • Q9. Derive the expression for the capacitance of a parallel plate capacitor with a dielectric medium between the plates.
  • Q10. Derive an expression for the energy stored in a charged capacitor. What is the energy density?
  • Q11. State and explain the principle of a Van de Graaff generator. Draw a labelled diagram.

📘 Key Formula: Capacitance of Parallel Plate Capacitor

C = ε₀εᵣA / d  where  ε₀ = permittivity of free space, εᵣ = dielectric constant, A = plate area, d = separation

⚡ Chapter 2: Current Electricity

Very Short Answer Questions (1 Mark)

  • Q1. State Ohm’s law. Write the condition for its validity.
  • Q2. Define resistivity. Write its SI unit.
  • Q3. What is the drift velocity of electrons in a conductor?
  • Q4. Write the colour code of a carbon resistor with bands: Yellow, Violet, Orange, Gold.

Short Answer Questions (2-3 Marks)

  • Q5. Derive the relation between current and drift velocity: I = neAvd.
  • Q6. Explain how resistivity varies with temperature for conductors and semiconductors.
  • Q7. A wire of resistance R is stretched to double its length. Find the new resistance.
  • Q8. State and explain Kirchhoff’s laws with suitable diagrams.

Long Answer Questions (4-5 Marks)

  • Q9. Derive the principle of a Wheatstone bridge and obtain the condition for a balanced bridge. State its applications.
  • Q10. Derive an expression for the equivalent emf and internal resistance of two cells connected in series and parallel.
  • Q11. Using Kirchhoff’s laws, obtain the current in each branch of a given network of resistors.

⚡ Chapter 3: Moving Charges & Magnetism

Very Short Answer Questions (1 Mark)

  • Q1. What is the Lorentz force? Write its expression.
  • Q2. Define the SI unit of magnetic field (Tesla).
  • Q3. What is the cyclotron frequency? Write its formula.
  • Q4. State the right-hand thumb rule for magnetic field direction.

Short Answer Questions (2-3 Marks)

  • Q5. Derive the expression for the force on a current-carrying conductor placed in a magnetic field.
  • Q6. Derive Biot-Savart’s law and apply it to find the magnetic field at the centre of a circular current loop.
  • Q7. Two parallel current-carrying conductors attract each other when currents are in the same direction. Explain.
  • Q8. Explain the working of a cyclotron with a labelled diagram.

Long Answer Questions (4-5 Marks)

  • Q9. State Ampere’s circuital law. Use it to derive the magnetic field due to an infinitely long straight current-carrying conductor.
  • Q10. Derive the expression for the torque on a current loop placed in a uniform magnetic field. Explain the working of a moving coil galvanometer.

⚡ Chapter 4: Electromagnetic Induction & Alternating Current

Very Short Answer Questions (1 Mark)

  • Q1. State Faraday’s law of electromagnetic induction.
  • Q2. What is Lenz’s law? How does it conserve energy?
  • Q3. Define self-inductance. Write its SI unit.
  • Q4. What is the phase difference between voltage and current in a purely inductive AC circuit?

Short Answer Questions (2-3 Marks)

  • Q5. Derive the expression for the induced emf in a coil rotating in a uniform magnetic field (AC generator principle).
  • Q6. Explain the construction and working of a step-up transformer. Derive the turns ratio relation.
  • Q7. A 100 mH inductor is connected to a 50 Hz AC source of 200 V. Find the inductive reactance and rms current.
  • Q8. Define the Q-factor of a series LCR circuit. Explain its significance.

Long Answer Questions (4-5 Marks)

  • Q9. Derive the expression for the impedance and resonant frequency of a series LCR circuit. Draw the resonance curve.
  • Q10. Explain the principle, construction, and working of an AC generator (alternator). Draw the output waveform.
🎯 Exam Tip: MP Board frequently asks numerical problems from LCR circuits and transformers in the 4-5 mark section. Practice impedance calculation, resonance frequency, and turns ratio problems thoroughly.

⚡ Chapter 5: Electromagnetic Waves

Very Short Answer Questions (1 Mark)

  • Q1. Who predicted the existence of electromagnetic waves?
  • Q2. Write the speed of electromagnetic waves in vacuum.
  • Q3. What is the displacement current? Write its expression.
  • Q4. Name the electromagnetic wave used in radar systems.

Short Answer Questions (2-3 Marks)

  • Q5. Write Maxwell’s equations in integral form. Explain their physical significance.
  • Q6. List the different regions of the electromagnetic spectrum in order of increasing wavelength. Give one application of each.
  • Q7. Show that c = 1/√(μ₀ε₀) from Maxwell’s equations.
  • Q8. Explain how electromagnetic waves are produced by an oscillating charge.

Long Answer Questions (4-5 Marks)

  • Q9. Derive the wave equation for electromagnetic waves from Maxwell’s equations in free space. Show that EM waves are transverse in nature.

⚡ Chapter 6: Ray Optics & Optical Instruments

Very Short Answer Questions (1 Mark)

  • Q1. State the laws of reflection.
  • Q2. Define critical angle and total internal reflection.
  • Q3. What is the power of a lens? Write its SI unit.
  • Q4. Write the lens maker’s formula.

Short Answer Questions (2-3 Marks)

  • Q5. Derive the mirror formula 1/f = 1/v + 1/u for a concave mirror.
  • Q6. Derive the lens maker’s formula for a thin lens in air.
  • Q7. Explain the formation of a rainbow using total internal reflection and dispersion concepts.
  • Q8. A convex lens of focal length 15 cm forms a real image at 30 cm. Find the object distance.

Long Answer Questions (4-5 Marks)

  • Q9. Explain the construction and working of a compound microscope. Derive an expression for its magnifying power.
  • Q10. Explain the construction and working of an astronomical telescope. Derive the expression for its magnifying power in normal adjustment.
🎯 Exam Tip: MP Board 2027 — Ray diagram questions are very common in Optics. Practice drawing ray diagrams for microscopes, telescopes, and image formation by mirrors/lenses. Marks are often awarded for clean, labelled diagrams.

⚡ Chapter 7: Wave Optics

Very Short Answer Questions (1 Mark)

  • Q1. State Huygens’ principle.
  • Q2. Define coherence of light sources.
  • Q3. Write the condition for constructive and destructive interference.
  • Q4. What is the fringe width in Young’s double-slit experiment?

Short Answer Questions (2-3 Marks)

  • Q5. Derive the expression for fringe width in Young’s double-slit experiment.
  • Q6. Explain diffraction of light at a single slit and derive the condition for minima.
  • Q7. Distinguish between interference and diffraction patterns.
  • Q8. What is the polarisation of light? Explain Brewster’s law.

Long Answer Questions (4-5 Marks)

  • Q9. Describe Young’s double-slit experiment. Derive the expression for the intensity distribution of the interference pattern.
  • Q10. State Huygens’ principle. Using it, prove the laws of reflection and refraction.

⚡ Chapter 8: Dual Nature of Radiation & Matter

Very Short Answer Questions (1 Mark)

  • Q1. State Einstein’s photoelectric equation.
  • Q2. Define work function and threshold frequency.
  • Q3. Write de Broglie’s hypothesis. Give the expression for de Broglie wavelength.
  • Q4. What is the stopping potential in photoelectric effect?

Short Answer Questions (2-3 Marks)

  • Q5. Explain the experimental observations of the photoelectric effect that could not be explained by classical wave theory.
  • Q6. Derive an expression for de Broglie wavelength of an electron accelerated through a potential V.
  • Q7. The work function of a metal is 2.3 eV. Find the maximum kinetic energy of photoelectrons when light of wavelength 400 nm falls on it.
  • Q8. Distinguish between photoelectric effect and Compton effect.

Long Answer Questions (4-5 Marks)

  • Q9. Describe the experimental setup of the photoelectric effect. Explain how Einstein’s photoelectric equation explains the observations.
  • Q10. Explain Davisson-Germer experiment. How did it confirm de Broglie’s hypothesis?

⚡ Chapter 9: Semiconductor Electronics

Very Short Answer Questions (1 Mark)

  • Q1. Distinguish between intrinsic and extrinsic semiconductors.
  • Q2. What is a p-n junction? Draw the symbol of a diode.
  • Q3. Define the forbidden energy gap. How does it vary between conductors, semiconductors, and insulators?
  • Q4. Write the truth table of a NAND gate.

Short Answer Questions (2-3 Marks)

  • Q5. Explain the formation of the depletion region in a p-n junction. Draw the V-I characteristic of a diode.
  • Q6. Explain the working of a full-wave rectifier with a circuit diagram.
  • Q7. Distinguish between an LED and a solar cell in terms of construction and working.
  • Q8. Realise a NOR gate using NAND gates only.

Long Answer Questions (4-5 Marks)

  • Q9. Explain the working of a p-n junction diode as a half-wave rectifier. Derive the expression for ripple factor and efficiency.
  • Q10. Explain the construction and working of an n-p-n transistor as an amplifier in common emitter configuration. Derive the expression for voltage gain.
Logic Gate Symbol Boolean Expression Truth Table (Y)
AND D-shaped Y = A · B 1 only when A=1, B=1
OR Shield-shaped Y = A + B 1 if any input is 1
NOT Triangle + circle Y = Ā Inverts input
NAND AND + circle Y = (A · B)’ 0 only when A=1, B=1
NOR OR + circle Y = (A+B)’ 1 only when A=0, B=0

❓ FAQs — Physics Board Exam Strategy

Q1. Which chapters have the highest weightage in MP Board Class 12 Physics?

Electrostatic Potential & Capacitance, Current Electricity, Moving Charges & Magnetism, and Ray Optics typically carry the highest marks (8-10 marks each). Semiconductor Electronics and EM Waves are lighter (4-6 marks each) but easier to score.

Q2. How should I study numericals for the Physics exam?

Focus on: (a) capacitor combinations and energy, (b) Kirchhoff’s laws and Wheatstone bridge, (c) magnetic field due to current-carrying conductors, (d) LCR circuits and transformers, (e) lens formula and magnifying power. Practice all NCERT numerical examples — MP Board often repeats similar patterns.

Q3. Are derivations important for the MP Board Physics paper?

Yes — derivations typically account for 20-25 marks in the 4-5 mark section. Key derivations: mirror formula, lens maker’s formula, Wheatstone bridge, AC generator, compound microscope, photoelectric equation, transistor amplifier. Write each derivation step-by-step with clear labelling.

Q4. How many diagrams should I practice?

At least 15-20 diagrams: ray diagrams for mirrors/lenses, microscope/telescope, AC generator, transformer, full-wave rectifier, transistor amplifier, cyclotron, Van de Graaff generator, Young’s double-slit, p-n junction V-I characteristic. Use a sharp pencil and label all parts clearly.

Q5. What is the best strategy to score 90%+ in Physics?

Phase 1 (4 weeks before exam): Complete all 9 chapter revisions — focus on concepts + derivations. Phase 2 (2 weeks): Solve 5 previous year papers in exam conditions. Phase 3 (last week): Revise formula sheets, practice diagrams, attempt mock tests. Key tip: Write answers in point-wise format with underlining for keywords — examiners award marks for presentation.

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