संक्षेप में: CBSE Class 10 Science Board 2027 — Physics, Chemistry, Biology तीनों sections से 30 most expected questions। SQP 2027 + PYQ analysis base पर। Assertion-Reason (4 marks guaranteed), diagram-based questions (lens, heart, circuit), numericals (mirror formula, resistance), case-study (3 × 4 marks) — सब covered। हर question के साथ marks, chapter, type, और solving tip। ये 30 questions prepare करो तो 55-65 marks range confidently score कर सकते हो।
Science Board 2027 — Paper Pattern Overview
CBSE Class 10 Science paper 2027 का pattern SQP से clear है। New pattern marking समझना ज़रूरी है।
| Feature | Detail |
|---|---|
| Total Marks | 80 (Theory) + 20 (Internal Assessment) |
| Time | 3 Hours |
| Sections | 5 Sections (A to E) |
| MCQ | 16 questions × 1 mark = 16 marks |
| Assertion-Reason | 4 questions (Section A में included) |
| Short Answer | 6 questions × 2 marks + 7 questions × 3 marks |
| Long Answer | 3 questions × 5 marks |
| Case-Study | 3 questions × 4 marks |
| Internal Choice | Most sections में available |
Subject-Wise Marks Distribution:
| Subject | Marks | % of Paper |
|---|---|---|
| Physics | 26 | 32.5% |
| Chemistry | 26 | 32.5% |
| Biology | 28 | 35% |
| Total | 80 | 100% |
Physics — 10 Expected Questions (26 Marks)
Physics में numericals, circuit diagrams, और lens/mirror questions guaranteed आते हैं। Smart study tips follow करो।
Question 1: Mirror Formula Numerical (3 Marks)
Question: एक concave mirror की focal length 15 cm है। Object mirror से 30 cm दूर है। Image की position, nature, और size ज्ञात करो।
- Chapter: Light — Reflection and Refraction
- Type: SA (Numerical)
- Difficulty: Medium
- Tip: 1/v + 1/u = 1/f use करो। Sign convention ध्यान रखो — concave mirror में u = -30, f = -15
Question 2: Lens Diagram (3 Marks)
Question: Convex lens से image formation के तीन cases diagram से दिखाओ — (i) object 2F से beyond (ii) object F और 2F के बीच (iii) object F पर।
- Chapter: Light — Reflection and Refraction
- Type: SA (Diagram-based)
- Difficulty: Medium
- Tip: Neat ray diagrams बनाओ — minimum 2 rays per case। Image nature (real/virtual, inverted/erect) label करो।
Question 3: Ohm's Law Numerical (2 Marks)
Question: 12V battery से connected circuit में 4Ω resistance है। Current ज्ञात करो। अगर resistance double हो जाए तो current पर क्या effect?
- Chapter: Electricity
- Type: SA
- Difficulty: Easy
- Tip: V = IR → I = 12/4 = 3A। Double R → I halves = 1.5A
Question 4: Series-Parallel Circuit (5 Marks)
Question: तीन resistors 2Ω, 4Ω, 6Ω — (a) series में connect करो — total resistance और current ज्ञात करो (battery 24V)। (b) parallel में total resistance। (c) कौन-सा combination ज़्यादा current draw करता है और क्यों?
- Chapter: Electricity
- Type: LA
- Difficulty: Hard
- Tip: Series: R = R₁+R₂+R₃। Parallel: 1/R = 1/R₁+1/R₂+1/R₃। Parallel = ज़्यादा current (कम resistance)
Question 5: Magnetic Effect — Fleming's Rule (1 Mark MCQ)
Question: Current-carrying conductor पर magnetic field में force की direction ज्ञात करने के लिए कौन-सा rule use होता है?
- Chapter: Magnetic Effects of Electric Current
- Type: MCQ
- Difficulty: Easy
- Tip: Fleming's Left Hand Rule — force, field, current (FBI)
Question 6: Electromagnetic Induction (2 Marks)
Question: Faraday's experiment of electromagnetic induction describe करो। Induced current की direction कैसे determine करते हैं?
- Chapter: Magnetic Effects of Electric Current
- Type: SA
- Difficulty: Medium
- Tip: Coil + magnet + galvanometer। Fleming's Right Hand Rule for direction।
Question 7: Power and Energy Numerical (2 Marks)
Question: 100W का electric bulb दिन में 10 hours use होता है। 30 दिन में consumed energy kWh में ज्ञात करो। अगर rate ₹5/unit है तो total bill?
- Chapter: Electricity
- Type: SA
- Difficulty: Easy
- Tip: Energy = P × t = 100 × 10 × 30 = 30000 Wh = 30 kWh → Bill = 30 × 5 = ₹150
Question 8: Refraction — Assertion-Reason (1 Mark)
Question: Assertion: Diamond में total internal reflection होता है। Reason: Diamond का refractive index बहुत high (2.42) है।
- Chapter: Light
- Type: Assertion-Reason
- Difficulty: Medium
- Tip: Both true, Reason explains Assertion → Option (a)
Question 9: Human Eye — Defects (3 Marks)
Question: Myopia (near-sightedness) क्या है? Diagram से explain करो कि myopia कैसे होता है और concave lens से कैसे correct होता है।
- Chapter: Human Eye and Colourful World
- Type: SA
- Difficulty: Medium
- Tip: 3 diagrams — normal eye, myopic eye, corrected eye। Labels clear रखो।
Question 10: Physics Case-Study (4 Marks)
Question: एक school lab में students ने circuit बनाया — battery (12V), ammeter, voltmeter, और variable resistor। Different resistance values पर current measure किया। Table दिया गया। (i) V-I graph बनाओ (ii) graph से resistance ज्ञात करो (iii) Ohm's law verify करो (iv) अगर wire की length double करें तो resistance पर effect।
- Chapter: Electricity
- Type: Case-Study
- Difficulty: Medium
- Tip: Graph draw → slope = R → Ohm's law verify। Length double = resistance double।
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Chemistry — 10 Expected Questions (26 Marks)
Question 11: Balanced Chemical Equation (2 Marks)
Question: नीचे दी गई reactions को balance करो और reaction type बताओ: (i) Fe + H₂O → Fe₃O₄ + H₂ (ii) Na + H₂O → NaOH + H₂
- Chapter: Chemical Reactions and Equations
- Type: SA
- Difficulty: Easy
- Tip: Atoms count करो दोनों sides — coefficients adjust करो
Question 12: Acid-Base Reaction (3 Marks)
Question: Acid और base का reaction होने पर क्या बनता है? Example दो। इस reaction को neutralization reaction क्यों कहते हैं? pH scale पर product कहाँ होगा?
- Chapter: Acids, Bases, and Salts
- Type: SA
- Difficulty: Medium
- Tip: Acid + Base → Salt + Water। pH ~ 7 (neutral)। Example: HCl + NaOH → NaCl + H₂O
Question 13: pH Scale — Assertion-Reason (1 Mark)
Question: Assertion: अगर soil का pH 5 से कम है तो उसमें lime (CaO) मिलाया जाता है। Reason: Lime acidic nature को neutralize करता है।
- Chapter: Acids, Bases, and Salts
- Type: Assertion-Reason
- Difficulty: Easy
- Tip: Both true, R explains A correctly
Question 14: Carbon Compounds — Homologous Series (3 Marks)
Question: Homologous series किसे कहते हैं? दो properties बताओ। Methane से Butane तक structures लिखो और molecular formula बताओ।
- Chapter: Carbon and its Compounds
- Type: SA
- Difficulty: Medium
- Tip: CH₄, C₂H₆, C₃H₈, C₄H₁₀ — difference = CH₂ हर step पर
Question 15: Metals and Non-metals (5 Marks)
Question: (a) Reactivity series क्या है? Top 5 और bottom 5 metals लिखो। (b) Copper sulphate solution में iron nail डालने पर क्या observe होता है? Equation लिखो। (c) Gold और silver को displacement reaction से क्यों extract नहीं कर सकते?
- Chapter: Metals and Non-metals
- Type: LA
- Difficulty: Hard
- Tip: Reactivity series याद रखो। Fe + CuSO₄ → FeSO₄ + Cu। Gold/Silver least reactive — electrolysis needed।
Question 16: Periodic Table — MCQ (1 Mark)
Question: Modern periodic table में element X का atomic number 12 है। X किस group और period में होगा?
- Chapter: Periodic Classification of Elements
- Type: MCQ
- Difficulty: Easy
- Tip: X = Magnesium → Group 2, Period 3
Question 17: Oxidation-Reduction (2 Marks)
Question: CuO + H₂ → Cu + H₂O — इस reaction में कौन oxidize हो रहा है और कौन reduce? Reason दो।
- Chapter: Chemical Reactions and Equations
- Type: SA
- Difficulty: Medium
- Tip: H₂ oxidize (oxygen gain), CuO reduce (oxygen loss)
Question 18: Soap and Detergent (2 Marks)
Question: Soap hard water में lather क्यों नहीं देता? Detergent hard water में कैसे काम करता है? Micelle formation explain करो।
- Chapter: Carbon and its Compounds
- Type: SA
- Difficulty: Medium
- Tip: Ca²⁺/Mg²⁺ ions soap के साथ insoluble compound बनाते हैं। Detergent नहीं बनाता।
Question 19: Chemical Reactions — Case Study (4 Marks)
Question: एक student ने lab में iron nails को different liquids में रखा — (A) water, (B) salt water, (C) oil, (D) vinegar। 7 दिन बाद observations record किए। (i) किस liquid में सबसे ज़्यादा rusting? (ii) Oil में rusting क्यों नहीं? (iii) Galvanization कैसे rusting रोकता है? (iv) Rusting की balanced equation लिखो।
- Chapter: Chemical Reactions and Equations / Metals and Non-metals
- Type: Case-Study
- Difficulty: Medium
- Tip: Salt water = maximum rusting। Oil = air/water block। 4Fe + 3O₂ + xH₂O → 2Fe₂O₃.xH₂O
Question 20: Ethanol Properties (3 Marks)
Question: Ethanol के तीन chemical properties लिखो — reactions के साथ। Ethanol और ethanoic acid में अंतर बताओ।
- Chapter: Carbon and its Compounds
- Type: SA
- Difficulty: Medium
- Tip: (1) Combustion, (2) Reaction with Na, (3) Dehydration। Table format में differences।
Biology — 10 Expected Questions (28 Marks)
Question 21: Human Heart Diagram (5 Marks)
Question: Human heart का well-labeled diagram बनाओ। Double circulation explain करो — pulmonary और systemic circulation के steps बताओ। Oxygenated और deoxygenated blood का path label करो।
- Chapter: Life Processes
- Type: LA
- Difficulty: Hard
- Tip: 4 chambers label करो। Arrows से blood flow दिखाओ। Pulmonary: Heart → Lungs → Heart। Systemic: Heart → Body → Heart
Question 22: Photosynthesis (3 Marks)
Question: Photosynthesis की balanced equation लिखो। Photosynthesis के लिए ज़रूरी conditions बताओ। Stomata की role explain करो।
- Chapter: Life Processes
- Type: SA
- Difficulty: Medium
- Tip: 6CO₂ + 6H₂O → (sunlight, chlorophyll) → C₆H₁₂O₆ + 6O₂
Question 23: Heredity — Mendel's Experiment (3 Marks)
Question: Mendel ने pea plants पर monohybrid cross किया — Tall (TT) × Dwarf (tt)। F₁ और F₂ generation का result बताओ। Phenotypic ratio क्या होगा F₂ में?
- Chapter: Heredity and Evolution
- Type: SA
- Difficulty: Medium
- Tip: F₁ = all Tt (Tall)। F₂ = TT:Tt:tt = 1:2:1 → Phenotypic ratio 3:1
Question 24: Reproductive Health — Assertion-Reason (1 Mark)
Question: Assertion: Contraceptive methods population control में important हैं। Reason: Barrier methods STDs से भी protection देते हैं।
- Chapter: How Do Organisms Reproduce
- Type: Assertion-Reason
- Difficulty: Easy
- Tip: Both true, but R is not the correct explanation of A → Option (b)
Question 25: Excretion — Nephron (3 Marks)
Question: Nephron का diagram बनाओ। Urine formation के तीन steps explain करो — filtration, reabsorption, secretion।
- Chapter: Life Processes
- Type: SA
- Difficulty: Medium
- Tip: Glomerulus → Bowman's capsule → PCT → Loop of Henle → DCT → Collecting duct
Question 26: Evolution — Homologous vs Analogous (2 Marks)
Question: Homologous organs और analogous organs में अंतर बताओ। Example दो।
- Chapter: Heredity and Evolution
- Type: SA
- Difficulty: Easy
- Tip: Homologous = same origin, different function (forelimbs)। Analogous = different origin, same function (wings of bird and bat)
Question 27: Nervous System (5 Marks)
Question: (a) Reflex arc का diagram बनाओ और components label करो। (b) Voluntary और involuntary actions में अंतर table में बताओ। (c) Brain के तीन main parts और उनके functions लिखो।
- Chapter: Control and Coordination
- Type: LA
- Difficulty: Hard
- Tip: Receptor → Sensory neuron → Spinal cord → Motor neuron → Effector। Brain: Cerebrum (thinking), Cerebellum (balance), Medulla (involuntary)
Question 28: Plant Hormones (2 Marks)
Question: Auxin और Gibberellin के functions बताओ। Phototropism में auxin की role explain करो।
- Chapter: Control and Coordination
- Type: SA
- Difficulty: Medium
- Tip: Auxin — cell elongation, phototropism। Gibberellin — stem growth, seed germination।
Question 29: Biology Case-Study (4 Marks)
Question: एक garden में दो plants रखे गए — Plant A को sunlight, water, और CO₂ मिला। Plant B को sunlight और water मिला लेकिन CO₂ restricted (bell jar + KOH)। 48 hours बाद iodine test किया। (i) किस plant में starch बनेगा? (ii) KOH की role क्या थी? (iii) ये experiment क्या prove करता है? (iv) Control experiment क्यों ज़रूरी है?
- Chapter: Life Processes
- Type: Case-Study
- Difficulty: Medium
- Tip: Plant A — starch positive। KOH absorbs CO₂। Proves CO₂ needed for photosynthesis। Control = comparison baseline।
Question 30: Sustainable Management (2 Marks)
Question: 3R concept (Reduce, Reuse, Recycle) explain करो examples के साथ। Biodegradable और non-biodegradable waste में अंतर बताओ।
- Chapter: Our Environment
- Type: SA
- Difficulty: Easy
- Tip: Reduce — कम use करो। Reuse — दोबारा use। Recycle — transform into new product। Bio = decompose, Non-bio = नहीं decompose।
Subject-Wise Preparation Priority
Physics (26 Marks):
| Priority | Chapter | Expected Marks |
|---|---|---|
| 🔴 High | Electricity | 8-10 |
| 🔴 High | Light — Reflection & Refraction | 7-8 |
| 🟡 Medium | Magnetic Effects | 5-6 |
| 🟡 Medium | Human Eye | 3-4 |
| 🟢 Low | Sources of Energy | 1-2 |
Chemistry (26 Marks):
| Priority | Chapter | Expected Marks |
|---|---|---|
| 🔴 High | Chemical Reactions | 5-6 |
| 🔴 High | Acids, Bases, Salts | 5-6 |
| 🟡 Medium | Carbon Compounds | 5-6 |
| 🟡 Medium | Metals and Non-metals | 5-6 |
| 🟢 Low | Periodic Classification | 3-4 |
Biology (28 Marks):
| Priority | Chapter | Expected Marks |
|---|---|---|
| 🔴 High | Life Processes | 8-10 |
| 🔴 High | Control and Coordination | 5-6 |
| 🟡 Medium | Heredity and Evolution | 4-5 |
| 🟡 Medium | Reproduction | 4-5 |
| 🟢 Low | Our Environment | 3-4 |
Scoring Strategy — 30 Questions से Maximum Marks
| Action | Expected Impact |
|---|---|
| Diagrams neat बनाओ | +5-8 marks (examiners diagrams पर marks देते हैं) |
| Answer writing tips follow करो | +3-5 marks (presentation matters) |
| Numericals में units लिखो | +2-3 marks (units missing = marks cut) |
| Assertion-Reason format समझो | 4 marks guaranteed |
| Case-study carefully पढ़ो | Paper attempt strategy से 12 marks secure |
Frequently Asked Questions
Science में diagrams कितने important हैं?
बहुत important — almost 15-20 marks directly या indirectly diagrams पर depend करते हैं। Heart, nephron, lens ray diagrams, circuit diagrams, brain — ये सब regularly पूछे जाते हैं। Diagram neat बनाओ, labels clear रखो, arrows से direction दिखाओ। Diagram missing = 1-2 marks definitely कटते हैं।
Assertion-Reason questions कैसे solve करें?
4 options होते हैं — (a) Both true, R explains A (b) Both true, R doesn't explain A (c) A true, R false (d) A false, R true। पहले A और R independently check करो — true/false decide करो। फिर connection check करो — R actually A को explain कर रहा है या नहीं। Tricky part connection है — carefully read करो।
Numericals में partial marks मिलते हैं?
हाँ! Formula लिखो = 0.5-1 mark। Values substitute करो = 0.5-1 mark। Final answer with unit = 1 mark। तो अगर calculation गलत भी हो जाए, formula + substitution + unit लिखने से 2/3 marks मिल सकते हैं। कभी blank मत छोड़ो।
Biology में diagrams या text — किस पर ज़्यादा focus करें?
दोनों पर। Biology में 5-mark questions usually "diagram + explanation" format में होते हैं। Text without diagram = incomplete answer। Diagram without text = incomplete answer। दोनों combine करो — diagram बनाओ, उसके नीचे points में explanation लिखो।
Case-study questions में time कैसे manage करें?
Case-study = 4 marks, 4 sub-questions। Maximum 8-10 minutes दो। पहले passage carefully पढ़ो (2 min), data extract करो, फिर questions answer करो (6-8 min)। Sub-questions usually easy-to-medium difficulty हैं — passage में answer hidden होता है। Time management strategy follow करो।
कौन-सी chapters skip कर सकते हैं?
Skip करने की recommendation नहीं — लेकिन अगर time कम है तो "Sources of Energy" और "Our Environment" combined 5-6 marks हैं — minimum effort में cover हो जाते हैं। बाकी सब chapters important हैं। Last 15 days strategy follow करो priority set करने के लिए।
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