🔬 Class 10 Science — Crash Revision 2026
विज्ञान Master Plan | RBSE 21 Feb / CBSE 25 Feb
Chemistry + Biology + Physics + Environment — सब कुछ एक जगह!
📢 CBSE Class 10 Science (086): 25 फरवरी 2026 (बुधवार), 10:30 AM - 01:30 PM — 8 दिन!
🎯 सबसे scoring: Chemical Equations (10 marks) + Electricity Numericals (10 marks) + Diagrams (10 marks) = 30 marks guaranteed!
📊 Chapter-wise Weightage — कहाँ से कितने marks?
| Unit | Chapters | Marks | Priority |
|---|---|---|---|
| 🧪 CHEMISTRY (रसायन विज्ञान) — 25-27 marks | |||
| Ch.1 | Chemical Reactions & Equations (रासायनिक अभिक्रियाएँ) | 5-7 | 🔴 HIGH |
| Ch.2 | Acids, Bases & Salts (अम्ल, क्षार, लवण) | 5-6 | 🔴 HIGH |
| Ch.3 | Metals & Non-Metals (धातु-अधातु) | 5-6 | 🔴 HIGH |
| Ch.4 | Carbon & Its Compounds (कार्बन यौगिक) | 5-6 | 🟡 MED |
| Ch.5 | Periodic Classification (तत्वों का वर्गीकरण) | 3-4 | 🟡 MED |
| 🧬 BIOLOGY (जीव विज्ञान) — 20-23 marks | |||
| Ch.6 | Life Processes (जैव प्रक्रम) | 5-7 | 🔴 HIGH |
| Ch.7 | Control & Coordination (नियंत्रण एवं समन्वय) | 5-6 | 🟡 MED |
| Ch.8 | Reproduction (जनन) | 5-6 | 🟡 MED |
| Ch.9 | Heredity & Evolution (आनुवंशिकता) | 5-6 | 🟡 MED |
| ⚡ PHYSICS (भौतिक विज्ञान) — 23-27 marks | |||
| Ch.10-11 | Light: Reflection & Refraction + Human Eye (प्रकाश) | 7-8 | 🔴 HIGH |
| Ch.12 | Electricity (विद्युत) | 7-8 | 🔴 HIGH |
| Ch.13 | Magnetic Effects of Current (विद्युत धारा के चुंबकीय प्रभाव) | 4-5 | 🟡 MED |
| 🌍 ENVIRONMENT (पर्यावरण) — 5-7 marks | |||
| Ch.14-15 | Sources of Energy + Our Environment + Natural Resources | 5-7 | 🟢 EASY |
📅 4-Day Crash Revision Plan (17-20 Feb) — RBSE Students
CBSE Students: आपके पास 8 दिन हैं — इसी plan को 2x time देकर follow करें।
5 PM - 8 PM
📖 Ch.1 Notes → | 📝 MCQ Test →
Ch.2 Acids, Bases & Salts: pH scale, Litmus test, Neutralization, Plaster of Paris, Baking Soda, Bleaching Powder बनाने की विधि।
📖 Ch.2 Notes → | 📝 MCQ Test →
9 PM - 11 PM
📖 Ch.3 Notes → | 📝 MCQ Test →
Morning
📖 Ch.4 Notes → | 📝 MCQ Test →
Ch.5 Periodic Classification: Mendeleev → Modern Periodic Table, Trends (atomic size, metallic character, electronegativity)।
📖 Ch.5 Notes →
2 PM - 5 PM
📖 Ch.6 Notes → | 📝 MCQ Test →
6 PM - 8 PM
📖 Ch.7 Notes → | 📝 MCQ Test →
9 PM - 11 PM
📖 Ch.8 Notes → | 📝 MCQ Test →
Morning
📖 Ch.9 Notes → | 📝 MCQ Test →
2 PM - 5 PM
📖 Ch.10 Light Notes → | 📝 MCQ Test →
📖 Ch.11 Human Eye Notes → | 📝 MCQ Test →
6 PM - 9 PM
Ohm's Law, Series/Parallel Circuits, Resistance combinations, Power & Energy numericals, Heating Effect of current।
📖 Ch.12 Electricity Notes → | 📝 MCQ Test →
📷 Ohm's Law Graph, Series & Parallel Circuits — Numericals के लिए ये diagrams समझना ज़रूरी!
Morning
📖 Ch.13 Notes → | 📝 MCQ Test →
2 PM - 4 PM
📖 Environment Notes → | 📝 MCQ Test →
5 PM - 7 PM
7:30 PM - 9 PM
10 PM
🧪 Must-Know Chemical Equations — 20 Equations रटो!
Ch.1: रासायनिक अभिक्रियाएँ (Chemical Reactions)
1. 2Mg + O₂ → 2MgO (संयोजन / Combination)
2. 2H₂O → 2H₂ + O₂ (विद्युत-अपघटन / Electrolysis)
3. CaCO₃ →(heat) CaO + CO₂ (ऊष्मीय अपघटन / Thermal Decomposition)
4. Fe + CuSO₄ → FeSO₄ + Cu (विस्थापन / Displacement)
5. BaCl₂ + Na₂SO₄ → BaSO₄↓ + 2NaCl (द्वि-विस्थापन / Double Displacement)
6. 2FeSO₄ →(heat) Fe₂O₃ + SO₂ + SO₃ (अपघटन)
7. CH₄ + 2O₂ → CO₂ + 2H₂O (दहन / Combustion)
📷 Types of Chemical Reactions
Ch.2: अम्ल, क्षार एवं लवण (Acids, Bases, Salts)
8. NaOH + HCl → NaCl + H₂O (उदासीनीकरण / Neutralization)
9. Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂ (अम्ल + कार्बोनेट)
10. 2NaCl + 2H₂O →(electrolysis) 2NaOH + Cl₂ + H₂ (क्लोर-ऐल्कली)
11. CaO + H₂O → Ca(OH)₂ (बुझा हुआ चूना / Slaked Lime)
12. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O (चूने का पानी test)
13. NaCl + H₂SO₄ → Na₂SO₄ + 2HCl
Ch.3: धातु एवं अधातु (Metals & Non-Metals)
14. 2Na + 2H₂O → 2NaOH + H₂↑ (सोडियम + जल)
15. Fe₂O₃ + 2Al → Al₂O₃ + 2Fe (थर्मिट अभिक्रिया / Thermite)
16. ZnO + C → Zn + CO (अपचयन / Reduction)
17. 2Cu + O₂ →(heat) 2CuO (भर्जन / Roasting — sort of)
18. 4Fe + 3O₂ + xH₂O → 2Fe₂O₃·xH₂O (जंग / Rusting)
Ch.4: कार्बन यौगिक (Carbon Compounds)
19. CH₃COOH + C₂H₅OH →(H₂SO₄) CH₃COOC₂H₅ + H₂O (एस्टरीकरण / Esterification)
20. CH₃COOC₂H₅ + NaOH → CH₃COONa + C₂H₅OH (साबुनीकरण / Saponification)
21. C₂H₅OH + O₂ → CH₃COOH + H₂O (ऑक्सीकरण / Oxidation — Ethanol to Acid)
22. C₂H₅OH →(H₂SO₄, 170°C) C₂H₄ + H₂O (निर्जलीकरण / Dehydration)
📝 Must-Know Formula Sheet
⚡ Electricity (Ch.12) — सबसे ज़्यादा Numericals!
V = IR (Ohm's Law — वोल्ट = एम्पियर × ओम)
R = ρl/A (Resistivity — प्रतिरोधकता)
Series: R = R₁ + R₂ + R₃ | I same, V different
Parallel: 1/R = 1/R₁ + 1/R₂ + 1/R₃ | V same, I different
P = VI = I²R = V²/R (Power — विद्युत शक्ति, Watt)
H = I²Rt (Heating Effect — ऊष्मीय प्रभाव, Joule)
W = Pt = VIt (Energy — ऊर्जा, Joule or kWh)
1 kWh = 3.6 × 10⁶ J (1 unit = 1000W × 1hour)
📷 Series & Parallel Circuit Diagrams
🔍 Light (Ch.10-11)
Mirror Formula: 1/v + 1/u = 1/f
Magnification: m = -v/u = h'/h
Lens Formula: 1/v - 1/u = 1/f
Power of Lens: P = 1/f (dioptre, f in metres)
Snell's Law: n = sin i / sin r
Sign Convention: Focus +ve (convex lens/concave mirror), -ve (concave lens/convex mirror)
📷 Mirror & Lens Ray Diagrams
🧲 Magnetism (Ch.13)
Fleming's Left Hand Rule: Thumb = Force, Index = Field (B), Middle = Current (I)
Fleming's Right Hand Rule: (Generator) Thumb = Motion, Index = Field, Middle = Induced Current
Transformer (Overview): Vp/Vs = Np/Ns (यह 12वीं का topic है, 10वीं में सिर्फ basic जानकारी — Step-up/Step-down समझना पर्याप्त)
🧬 Biology Key Facts
Photosynthesis: 6CO₂ + 6H₂O →(sunlight, chlorophyll) C₆H₁₂O₆ + 6O₂
Respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (ATP)
Mendel's Ratios: Monohybrid = 3:1, Dihybrid = 9:3:3:1
Sex Determination: XX = Female, XY = Male (Father decides!)
📷 Heart, Nephron, Brain & Neuron — ये 4 diagrams ज़रूर practice करें!
🎨 Must-Draw Diagrams — Neat = Extra Marks!
🎯 Exam Day Strategy
📋 Attempt Order: MCQs (Section A) → Short Answers → Long Answers → Case-based
🧪 Equations: हर equation के साथ type लिखें (संयोजन/विस्थापन etc.)
📐 Numericals: Formula → Given/Find → Substitution → Answer with Units → Box it
🎨 Diagrams: Pencil + Scale, सभी parts label करें, arrows direction दिखाएं
⏱️ Time: RBSE (3:15 hr): MCQs (30 min) → Short (40 min) → Long (50 min) → Diagrams (20 min) → Numericals (30 min) → Review (15 min)
📚 Chapter-wise Study Material — सब कुछ एक जगह!
📖 Chapter Notes (NCERT + RBSE)
📝 Online MCQ Tests (Chapter-wise)
🎯 Mega Tests & Important Questions
❓ FAQ — अक्सर पूछे जाने वाले प्रश्न
📚 और Study Material चाहिए?
🔬 All Science Posts 📝 MCQ Tests 📅 Full Exam Schedule ⚡ Class 12 Physics Revision📢 Science का पेपर RBSE 21 Feb / CBSE 25 Feb — दोस्तों को भेजो!
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