This JKBOSE 12th Physics Dawn Guess Paper 2025 JKBOSE 12th Physics Dawn Guess Paper 2025 has been carefully compiled to help students prepare efficiently for the upcoming Annual Regular/Private Exams. It covers all important topics from the JKBOSE syllabus and frequently asked questions from past papers.
⚛️ Electrostatics
- State and explain Gauss’s Law. Derive the expression for the electric field due to:
- (i) Infinite line charge
- (ii) Infinite sheet of charge
- Deduce Coulomb’s law from Gauss’s law.
- Derive expression for Electric field due to a dipole.
- Derive potential due to a dipole on axial and equatorial line.
- Derive capacitance of a parallel plate capacitor (with and without dielectric).
- Derive the expression for torque on an electric dipole in a uniform electric field
- Explain equipotential surfaces and their characteristics.
- Define electric dipole, electric flux, and quantization of charge.
- State Coulomb’s Law (in vector form) and define unit charge.
- Work done in rotating a dipole and its potential energy.
🔌 Current Electricity
- Define current, drift velocity, and derive the relation between them.
- State and explain Ohm’s Law and the temperature dependence of resistance.
- Derive the relation .
- A wire of resistance is stretched to double its length — find new resistance.
- Explain EMF and potential difference.
- State Kirchhoff’s rules and obtain balance condition for Wheatstone Bridge.
🧲 Magnetism & Moving Charges
- Derive the expression for magnetic force on a charged particle and its circular path.
- State Biot-Savart Law and derive magnetic field due to:
- (a) Straight conductor
- (b) Circular coil
- Derive torque on a current loop; explain Moving Coil Galvanometer, and define:
- (a) Current sensitivity
- (b) Voltage sensitivity
- State Ampere’s Circuital Law and apply it to:
- (i) Straight conductor
- (ii) Solenoid
- (iii) Toroid
- Differentiate between paramagnetic, diamagnetic, and ferromagnetic materials.
⚡ Electromagnetic Induction
- Define Magnetic Flux and its SI unit.
- State and explain Faraday’s Laws of Induction.
- Explain the Lenz’s Law and its physical significance.
- Write expression for induced EMF:
- Mention factors affecting magnetic flux.
🔭 Ray Optics
- Derive Mirror Formula:
- Derive Lens Maker’s Formula and state its assumptions.
- Define real and apparent depth.
- Explain Total Internal Reflection (TIR) and derive relation for the critical angle.
- Define mirage and optical fiber.
- Derive prism formula:
- Explain dispersion of light and dispersive power.
- Derive expression for magnifying power of a compound microscope and telescope.
🌊 Wave Optics
- Define wavefront and its types.
- State Huygens’ Principle and explain reflection & refraction using it.
- Describe Young’s Double Slit Experiment and derive expression for fringe width.
- Explain diffraction of light through a single slit.
- Define coherent sources and conditions for sustained interference.
☢️ Dual Nature of Matter & Radiation
- Explain the photoelectric effect and derive Einstein’s equation.
- State the laws of photoelectric emission.
- Define threshold frequency, wavelength, and stopping potential.
- Discuss de Broglie hypothesis and derive λ = h/p.
🧮 Atoms, Nuclei & Semiconductor Electronics
- Postulates of Bohr’s model; derive expressions for radius and energy levels.
- Explain binding energy curve and nuclear forces.
- Define nuclear fission and nuclear fusion.
- Explain band theory and differentiate between conductors, semiconductors, and insulators.
- Define doping and explain intrinsic & extrinsic semiconductors.
- Explain PN junction, rectifier, and displacement current.
- Write a short note on electromagnetic spectrum.
✅ Tips for Students
- Focus on derivations and definitions — these carry high weightage.
- Practice numerical questions from each unit.
- Revise Ray Optics, Electrostatics, and Current Electricity thoroughly.
- Prepare short notes and diagrams for last-minute revision.