⚡ Class 12 Physics — Last 3 Days Crash Revision
भौतिक विज्ञान 3-दिन Master Plan 2026
CBSE Board Exam: 20 February 2026 (शुक्रवार) | 10:30 AM - 01:30 PM
RBSE Board Exam: 16 February 2026 ✅ हो चुका
✅ CBSE Class 12 Physics का पेपर 20 Feb को है (3 दिन बाद)
✅ RBSE का Physics हो चुका है — अब Chemistry (4 Mar) की तैयारी करनी है
✅ आप 70 marks में से 60+ marks लाना चाहते हैं
✅ आपको structured revision plan चाहिए — क्या पहले, क्या बाद में
📋 Paper Pattern — CBSE 2026 (70 Marks, 3 Hours)
💡 Internal Choice: Section C में 2 questions, Section E में सभी 3 questions में choice है
📊 Chapter-wise Weightage — कहाँ से कितने marks?
| Unit / Chapter | Topics | Marks | Priority |
|---|---|---|---|
| ⚡ Ch.1-2: Electrostatics | Coulomb's Law, Electric Field, Potential, Capacitors | 8 | 🔴 HIGH |
| ⚡ Ch.3: Current Electricity | Ohm's Law, Kirchhoff, Wheatstone, Metre Bridge, Potentiometer | 7 | 🔴 HIGH |
| 🧲 Ch.4-5: Magnetism | Biot-Savart, Ampere's Law, Moving Coil Galvanometer | 6 | 🟡 MED |
| 🔄 Ch.6-7: EMI + AC | Faraday's Law, Lenz's Law, AC Generator, Transformer, LCR | 6 | 🟡 MED |
| 🌊 Ch.8: EM Waves | Displacement Current, EM Spectrum | 5 | 🟢 EASY |
| 🔍 Ch.9-10: Optics | Lens/Mirror Formula, TIR, Microscope, Telescope, Young's DSE, Diffraction | 14 | 🔴 HIGH |
| 🔬 Ch.11-13: Modern Physics | Photoelectric, de Broglie, Bohr Model, Nuclear Reactions, Radioactivity | 12 | 🔴 HIGH |
| 💡 Ch.14: Semiconductor | p-n Junction, Diode, Transistor, Logic Gates | 7 | 🟡 MED |
📅 3-Day Crash Revision Plan (17-19 Feb)
Focus: Electrostatics + Current Electricity + Optics
5 PM - 8 PM
9 PM - 11 PM
Morning
6 AM - 10 AM
Afternoon
2 PM - 5 PM
Focus: Magnetism + EMI + AC + EM Waves
6 PM - 9 PM
Magnetism & Matter (Ch.5): Magnetic properties, Hysteresis curve, Curie's Law। 📖 Ch.5 Notes →
9:30 PM - 11 PM
AC (Ch.7): AC Generator, Transformer, LCR Series Circuit, Resonance, Power Factor। 📖 AC Notes →
6 AM - 8 AM
Focus: Modern Physics + Semiconductor + Formula Revision + Paper Practice
10 AM - 1 PM
Atoms (Ch.12): Bohr Model (postulates + derivation), Hydrogen Spectrum, Energy Levels। 📖 Ch.12 Notes →
Nuclei (Ch.13): Binding Energy curve, Radioactive Decay law, Half-life, Fission vs Fusion। 📖 Ch.13 Notes →
3 PM - 5 PM
6 PM - 8 PM
8:30 PM - 10 PM
📖 Physics Important Questions →
10:30 PM
📝 Must-Know Formula Sheet — रटो और exam में लिखो!
⚡ Electrostatics (Ch.1-2)
F = kq₁q₂/r² (Coulomb's Law)
E = kq/r² (Electric field, point charge)
V = kq/r (Potential, point charge)
E = -dV/dr (Relation E & V)
C = εₒA/d (Parallel plate capacitor)
U = ½CV² = ½QV = Q²/2C (Energy stored)
Series: 1/C = 1/C₁ + 1/C₂ | Parallel: C = C₁ + C₂
📷 Electric Field Lines & Capacitor Diagram
🔌 Current Electricity (Ch.3)
V = IR (Ohm's Law) | R = ρl/A
Series: R = R₁ + R₂ | Parallel: 1/R = 1/R₁ + 1/R₂
EMF: ε = V + Ir | ε = I(R + r)
P = VI = I²R = V²/R
Wheatstone: P/Q = R/S
Metre Bridge: R/S = l/(100-l)
Potentiometer: ε₁/ε₂ = l₁/l₂
📷 Wheatstone Bridge, Metre Bridge & Potentiometer
🧲 Magnetism (Ch.4-5)
F = qvBsinθ (Lorentz force)
F = BIlsinθ (Force on conductor)
B = μₒI/2πr (Straight wire)
B = μₒnI (Solenoid)
τ = nBIA (Torque on coil)
📷 Moving Coil Galvanometer & Magnetic Force
🔄 EMI + AC (Ch.6-7)
ε = -dφ/dt (Faraday's Law)
ε = Blv (Motional EMF)
L = μₒn²Al (Self inductance, solenoid)
Transformer: Vs/Vp = Ns/Np = Ip/Is
XL = ωL | XC = 1/ωC
Z = √(R² + (XL-XC)²) (Impedance)
Resonance: ω = 1/√(LC)
Power: P = VrmsIrmscosφ
📷 AC Generator, Transformer & LCR Circuit
🔍 Optics (Ch.9-10)
1/v - 1/u = 1/f (Mirror formula)
1/v - 1/u = 1/f (Lens formula)
1/f = (μ-1)(1/R₁ - 1/R₂) (Lens Maker)
m = v/u = -v/u (Magnification)
Power: P = 1/f (in metres) dioptre
sinC = 1/μ (Critical angle, TIR)
β = λD/d (Fringe width, Young's DSE)
θ = 1.22λ/D (Resolving power)
📷 Microscope, Telescope & Young's DSE Diagram
🔬 Modern Physics (Ch.11-13)
E = hν = hc/λ (Photon energy)
KEmax = hν - φ (Einstein's PE equation)
λ = h/mv = h/√(2mKE) (de Broglie)
rn = n²aₒ/Z (Bohr radius)
En = -13.6Z²/n² eV (Energy levels)
1/λ = RZ²(1/n₁² - 1/n₂²) (Rydberg)
N = Nₒe^(-λt) (Radioactive decay)
T½ = 0.693/λ (Half-life)
E = mc² (Mass-energy)
BE/A = [Zm_p + Nm_n - M]×931.5 MeV
📷 Photoelectric Effect, Bohr Model & BE/A Curve
💡 Semiconductor (Ch.14)
nenh = ni² (Mass action law)
▸ Transistor Formulas:
IE = IB + IC
β = IC/IB (Current gain, CE config)
α = IC/IE (Current gain, CB config)
β = α/(1-α) (Relation between α and β)
▸ Logic Gates:
AND (A·B), OR (A+B), NOT (Ā)
NAND = NOT(AND), NOR = NOT(OR) — Universal Gates
📷 p-n Junction, Rectifier, Transistor & Logic Gates
🎨 Must-Draw Diagrams Checklist — Neat बनाना = Extra marks!
🔥 Most Repeated Questions — ये ज़रूर आएंगे!
⚡ Electrostatics + Current Electricity (15 marks)
- Derive Coulomb's law from Gauss's theorem / Gauss's theorem proof
- Electric field on axial & equatorial point of a dipole — derivation
- Capacitance of parallel plate capacitor with/without dielectric
- Kirchhoff's Laws — solve circuit numericals
- Wheatstone Bridge principle + Metre Bridge derivation
- Potentiometer — compare EMFs, find internal resistance
🔍 Optics (14 marks)
- Derive Lens Maker's formula
- Refraction through Prism — derive δ = (μ-1)A
- Compound Microscope / Telescope — ray diagram + magnifying power
- Young's Double Slit — derive fringe width β = λD/d
- Single slit diffraction — conditions for maxima/minima
- Total Internal Reflection — conditions + applications (optical fibre)
🔬 Modern Physics + Semiconductor (19 marks)
- Einstein's Photoelectric equation — derive + explain 3 laws
- de Broglie wavelength derivation
- Bohr's postulates + derive rn, vn, En for hydrogen atom
- Hydrogen spectrum series (Lyman, Balmer, Paschen)
- Radioactive decay law — N = Nₒe^(-λt), half-life derivation
- Nuclear Fission vs Fusion — differences + examples
- p-n junction formation + V-I characteristics
- Full-wave rectifier — circuit + working
- Transistor as switch / amplifier (CE configuration)
- Logic Gates — NAND, NOR as universal gates
🎯 Exam Day Strategy — 20 Feb 2026
⏰ 9:00 AM: Centre पहुँचो — Admit Card + Pen + Pencil + Scale + Calculator (nope!) check
⏰ 10:15 AM: Question Paper मिलेगा — 15 min reading time
📋 Reading Time Strategy: पहले Section E (Long Answers) पढ़ो — internal choice decide करो
✅ Attempt Order: Section A (MCQs) → Section B → Section C → Section E → Section D
📐 Diagrams: Pencil + Scale से बनाओ, Labels ज़रूर लिखो
🔢 Numericals: Formula → Substitution → Calculation → Units → Box the answer
📝 Derivations: Step-by-step लिखो, हर step में equation number दो
⏱️ Time Split: Section A (25 min) → B (15 min) → C (40 min) → E (40 min) → D (20 min) → Review (10 min)
📚 Chapter-wise Study Material — सब कुछ एक जगह
📖 NCERT Notes (Chapter-wise)
📝 MCQ Tests & Practice
🎯 Important Questions & Exam Kit
❓ FAQ — अक्सर पूछे जाने वाले प्रश्न
📄 RBSE छात्रों के लिए — Chapter Notes (Hindi)
ℹ️ RBSE Class 12 Physics (Code 40) का पेपर 16 Feb 2026 को हो चुका है। ये notes अब revision और अन्य विषयों की cross-reference के लिए उपयोगी हैं।
📢 Physics का पेपर 20 Feb को है — दोस्तों को भी भेजो!
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