Class 10 Science Q&A
Chapter-wise Samacheer Kalvi Class 10 Science answers for Physics, Chemistry, and Biology with exam-friendly revision support. Open Class 10 Science.
📋 Official Samacheer Kalvi Syllabus
Grade 10 Science — All Chapters
All 23 chapters live with complete book back Q&A. Click any chapter to study.
Grade 6
Grade 7
Grade 8
Grade 9
Grade 10 ✓
Physics
- 01Laws of MotionLIVE ✓
- 02OpticsLIVE ✓
- 03Thermal PhysicsLIVE ✓
- 04ElectricityLIVE ✓
- 05AcousticsLIVE ✓
- 06Nuclear PhysicsLIVE ✓
Chemistry
- 07Atoms and MoleculesLIVE ✓
- 08Periodic Classification of ElementsLIVE ✓
- 09SolutionsLIVE ✓
- 10Types of Chemical ReactionsLIVE ✓
- 11Carbon and its CompoundsLIVE ✓
Biology
- 12Plant Anatomy and Plant PhysiologyLIVE ✓
- 13Structural Organisation of AnimalsLIVE ✓
- 14Transportation in Plants and Circulation in AnimalsLIVE ✓
- 15Nervous SystemLIVE ✓
- 16Plant and Animal HormonesLIVE ✓
- 17Reproduction in Plants and AnimalsLIVE ✓
- 18GeneticsLIVE ✓
- 19Origin and Evolution of LifeLIVE ✓
- 20Breeding and BiotechnologyLIVE ✓
- 21Health and DiseasesLIVE ✓
- 22Environmental ManagementLIVE ✓
- 23Visual CommunicationLIVE ✓
Grade 6 — Coming SoonWe're building chapter-by-chapter content. Check back soon.
Grade 7 — Coming SoonWe're building chapter-by-chapter content. Check back soon.
Grade 8 — Coming SoonWe're building chapter-by-chapter content. Check back soon.
Physics
- 01MeasurementLIVE ✓
- 02MotionLIVE ✓
- 03FluidsLIVE ✓
- 04Electric Charge and Electric CurrentLIVE ✓
- 05Magnetism and ElectromagnetismLIVE ✓
- 06LightLIVE ✓
- 07HeatLIVE ✓
- 08SoundLIVE ✓
- 09UniverseLIVE ✓
Chemistry
- 10Matter Around UsLIVE ✓
- 11Atomic StructureLIVE ✓
- 12Periodic Classification of ElementsLIVE ✓
- 13Chemical BondingLIVE ✓
- 14Acids, Bases and SaltsLIVE ✓
- 15Carbon and Its CompoundsLIVE ✓
- 16Applied ChemistryLIVE ✓
Biology
- 17Animal KingdomLIVE ✓
- 18Organisation of TissuesLIVE ✓
- 19Plant PhysiologyLIVE ✓
- 20Organ Systems in AnimalsLIVE ✓
- 21Nutrition and HealthLIVE ✓
- 22Economic BiologyLIVE ✓
- 23Environmental ScienceLIVE ✓
Computer Science
- 24LibreOffice ImpressLIVE ✓
Mathematics
- 01Set LanguageLIVE ✓
- 02Real NumbersLIVE ✓
- 03AlgebraLIVE ✓
- 05Coordinate GeometryLIVE ✓
- 07MensurationLIVE ✓
- 08StatisticsLIVE ✓
🔬 Samacheer Kalvi Grade 9 Science
Grade 9 Science — Chapter-wise Q&A
Physics, Chemistry, Biology and Computer Science textbook exercises with expandable answers.
Physics
- 01MeasurementLIVE ✓
- 02MotionLIVE ✓
- 03FluidsLIVE ✓
- 04Electric Charge and Electric CurrentLIVE ✓
- 05Magnetism and ElectromagnetismLIVE ✓
- 06LightLIVE ✓
- 07HeatLIVE ✓
- 08SoundLIVE ✓
- 09UniverseLIVE ✓
Chemistry
- 10Matter Around UsLIVE ✓
- 11Atomic StructureLIVE ✓
- 12Periodic Classification of ElementsLIVE ✓
- 13Chemical BondingLIVE ✓
- 14Acids, Bases and SaltsLIVE ✓
- 15Carbon and Its CompoundsLIVE ✓
- 16Applied ChemistryLIVE ✓
Biology
- 17Animal KingdomLIVE ✓
- 18Organisation of TissuesLIVE ✓
- 19Plant PhysiologyLIVE ✓
- 20Organ Systems in AnimalsLIVE ✓
- 21Nutrition and HealthLIVE ✓
- 22Economic BiologyLIVE ✓
- 23Environmental ScienceLIVE ✓
🧮 Samacheer Kalvi Grade 9 Mathematics
Grade 9 Maths — Chapter-wise Q&A
Book back questions and answers with the same expandable study UI used for Grade 10.
Unit 1
- 1.1SetLIVE ✓
- 1.2Types of SetsLIVE ✓
- 1.3Set OperationsLIVE ✓
- 1.6Cardinality of SetsLIVE ✓
Unit 2
- 2.1Rational NumbersLIVE ✓
- 2.2Irrational NumbersLIVE ✓
- 2.3Real Number SystemLIVE ✓
Unit 3
- 3.1Algebra Q&ALIVE ✓
- 3.15Multiple Choice QuestionsLIVE ✓
Unit 5
- 5.1Coordinate SystemLIVE ✓
- 5.2Distance FormulaLIVE ✓
Unit 7
- 7.1Mensuration Q&ALIVE ✓
Unit 8
- 8.1Statistics Q&ALIVE ✓
🧮 Samacheer Kalvi Grade 10 Mathematics
All 8 Maths Units — Full Q&A
Every exercise with step-by-step solutions. Click any unit to study.
Unit 1
- 1.1Cartesian ProductLIVE ✓
- 1.2RelationsLIVE ✓
- 1.3FunctionsLIVE ✓
- 1.4Types of FunctionsLIVE ✓
- 1.5Composition of FunctionsLIVE ✓
Unit 2
- 2.1Euclid's Division AlgorithmLIVE ✓
- 2.2Fundamental TheoremLIVE ✓
- 2.3Modular ArithmeticLIVE ✓
- 2.4SequencesLIVE ✓
- 2.5–2.9AP, GP & Special SeriesLIVE ✓
Unit 3
- 3.1System of Linear EquationsLIVE ✓
- 3.2–3.6GCD, LCM & Rational ExpressionsLIVE ✓
- 3.7–3.8Square Root of PolynomialsLIVE ✓
- 3.9–3.14Quadratic EquationsLIVE ✓
- 3.15–3.18Graphs & MatricesLIVE ✓
Unit 4
- 4.1Similarity & Similar TrianglesLIVE ✓
- 4.2Thales & Angle Bisector TheoremLIVE ✓
- 4.3Pythagoras TheoremLIVE ✓
- 4.4Concurrency TheoremsLIVE ✓
Unit 5
- 5.1Area of Triangle & QuadrilateralLIVE ✓
- 5.2Inclination of a LineLIVE ✓
- 5.3Straight LineLIVE ✓
- 5.4General Form of Straight LineLIVE ✓
Unit 6
- 6.1Trigonometric IdentitiesLIVE ✓
- 6.2Angle of ElevationLIVE ✓
- 6.3Angle of DepressionLIVE ✓
- 6.4Combined Elevation & DepressionLIVE ✓
Unit 7
- 7.1Surface AreaLIVE ✓
- 7.2VolumeLIVE ✓
- 7.3Volume & Surface Area of Combined SolidsLIVE ✓
- 7.4Conversion of SolidsLIVE ✓
Unit 8
- 8.1Measures of DispersionLIVE ✓
- 8.2Coefficient of VariationLIVE ✓
- 8.3ProbabilityLIVE ✓
- 8.4Addition Theorem of ProbabilityLIVE ✓
📊 TN SSLC Grade 10 Science · 2025–26
Exam Blueprint & Marks Weightage
Exactly how your 100 marks are split across parts and subjects.
📝 Theory Paper — 75 Marks
I
Multiple Choice Questions
Answer all 12 · No choice · 1 mark each · All from book back
12
II
Short Answer Questions
Answer 10 of 12 · 2 marks each · 2–3 sentences per answer
20
III
Long Answer Questions
Answer 7 of 9 · 4 marks each · Diagrams earn marks
28
IV
Essay Questions
Answer all 3 · 7 marks each · Internal choice provided
21
+
Practical Examination
Practical exam + Project + Internal assessment
25
100
Total Marks · TN SSLC Science
75
Theory Marks
25
Practical Marks
26
Min. Theory Pass
12
Min. Practical Pass
35%
Overall Pass %
3h 15m
Duration
🔥 Chapter Priority in Public Exam
Laws of Motion
HIGH
Optics
HIGH
Electricity
HIGH
Carbon & Compounds
HIGH
Genetics
HIGH
Reproduction
HIGH
Nervous System
HIGH
Atoms & Molecules
MED
Thermal Physics
MED
Solutions
MED
Chemical Reactions
MED
Transportation
MED
Acoustics
LOW
Env. Management
LOW
Visual Communication
LOW
● HIGH — 7-mark essay every year
● MED — Usually 2–4 mark questions
● LOW — Mostly MCQ/short answer
⭐ Analysis of 2020–2025 Public Exams
Most Repeated Important Questions
Questions that have appeared 3+ times in the last 5 public exams. Study these first.
⚡ Physics
⚗️ Chemistry
🌿 Biology
Chapter 1 — Laws of Motion
7M⭐
State and prove the Law of Conservation of Momentum. Give two examples.
4M⭐
Derive F = ma from Newton's Second Law of Motion.
4M⭐
Explain apparent weight of a person in a lift for all cases.
Chapter 2 — Optics
7M⭐
Explain the construction and working of a compound microscope with a ray diagram.
4M⭐
Explain total internal reflection. State conditions and give two applications.
Chapter 4 — Electricity
7M⭐
Derive expressions for effective resistance in series and parallel combinations with diagrams.
4M⭐
State Ohm's Law. Draw the V-I graph and explain resistance from it.
Chapter 7 — Atoms and Molecules
4M⭐
State and explain the Laws of Chemical Combination.
2M⭐
Define mole. Calculate the number of molecules in 18 g of water.
Chapter 9 — Solutions
7M⭐
Explain types of solutions. Define solubility and factors affecting it.
Chapter 11 — Carbon and its Compounds
7M⭐
Explain allotropes of carbon — diamond, graphite and fullerene — with structure and properties.
Chapter 17 — Reproduction
7M⭐
Describe sexual reproduction in flowering plants. Draw and label parts of a flower.
Chapter 18 — Genetics
7M⭐
State Mendel's laws. Explain monohybrid and dihybrid crosses with Punnett squares.
Chapter 15 — Nervous System
7M⭐
Describe the structure and functions of the human brain with a labelled diagram.
4M⭐
Explain the structure of a neuron with a diagram. Describe impulse transmission.
🧮 Interactive Tool
Science Score Calculator
Enter your marks in each section to instantly see your total and pass/fail status.
Your Total Score
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/ 100
💡 Centum Strategy
How to Score High in Science
Strategies used by students who scored 95+ in TN SSLC Science.
MCQ — Aim for 12/12
Every MCQ comes directly from book-back questions. Study book-back MCQs from all 23 chapters. Don't skip any chapter even if it seems unimportant.
+12 marks guaranteedDiagrams = Free Marks
For 4M and 7M Biology and Optics questions, a neat labelled diagram earns 1–2 marks even if your written answer is incomplete.
+2 per questionWrite Every Step
For numericals always write: Given → Formula → Substitution → Answer with unit. You get step marks even when the final answer is wrong.
Saves 2–3 marksSolve 5 Years' Papers
The same questions repeat — especially 7-mark essays. Solving 2020–2024 papers timed covers 80% of what will appear in your exam.
Best revision methodTime Management
Part I: 20 min · Part II: 25 min · Part III: 40 min · Part IV: 40 min · Review: 10 min. Never spend more than 8 minutes on one 4-mark question.
Complete all partsRevise 3 Times
First revision 4 weeks before, second 2 weeks before, third 3 days before. Only formulas, definitions and diagrams in the final 3 days.
Long-term retentionFree Samacheer Kalvi Study Materials
Study Support for Tamil Nadu Students
Brain Grain brings Class 9 and Class 10 Science, Maths, exam papers, and academic AI doubt help into one mobile-friendly study space.
Class 10 Maths Solutions
Unit-wise Class 10 Maths solutions for SSLC students, including algebra, geometry, trigonometry, mensuration, and probability. Open Class 10 Maths.
Class 9 Maths and Science Help
Build strong basics before public exam year with Class 9 Maths and Science textbook exercise answers. Maths · Science.
Tamil Nadu Public Exam Question Papers
View Class 10 SSLC public exam question papers inside the site and practise with real exam-style papers. View question papers.
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❓ Common Questions
Frequently Asked Questions
What is the passing mark for TN SSLC Grade 10 Science? ▾
Students need a minimum of 35 marks out of 100 overall. At least 26 out of 75 must come from the theory exam and at least 12 out of 25 from practicals. Both must be satisfied separately.
How many chapters are there in Grade 10 Science? ▾
23 chapters total — 6 Physics (Ch.1–6), 5 Chemistry (Ch.7–11), and 12 Biology (Ch.12–23). All 23 are live on Brain Grain with complete book back Q&A.
Is the Brain Grain study content really free? ▾
Yes — all 23 chapter pages including concept explanations, all book-back Q&A, MCQs, solved numericals and important questions are 100% free, always.
Which chapters are most important for the public exam? ▾
HIGH priority: Laws of Motion, Optics, Electricity (Physics) · Carbon & Compounds, Solutions (Chemistry) · Genetics, Reproduction, Nervous System (Biology). But never skip any chapter — MCQs come from all 23 every year.
Is there internal choice in the Grade 10 Science exam? ▾
Yes. Part II: Answer 10 of 12. Part III: Answer 7 of 9. Part IV: All 3 compulsory but each has internal choice (a or b). Part I (MCQ): Answer all 12, no choice.