📋 Syllabus 📄 Past Papers 🎯 10th Revision 🔬 Class 9 Science 🧮 Class 9 Maths ⚛️ Class 12 ✏️ TET Practice 🇮🇳 CTET Practice 🏛️ TNPSC 📋 SSC CGL 🏦 IBPS PO 🚂 RRB NTPC 🏛️ UPSC CSE 🤖 AI Doubt Solver
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Samacheer Class 6–12 Q&A, SSLC past papers, AI doubt help — bilingual TET, CTET, TNPSC, SSC CGL, IBPS PO, RRB NTPC and UPSC CSE practice MCQs.

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📄 Past Papers 2020–2026
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TNTET Revision Challenge

1000+ bilingual Paper I & II MCQs, AI topic drills, 150-question mock test, gap analysis, and 40-day planner. Tamil Nadu state school teachers.

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CTET Practice Questions 2025

CDP, Maths Pedagogy, EVS, Language & Social Studies MCQs with answers. For KV, NVS and central government school teacher jobs across India.

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TNPSC Group 4 Practice

Junior Assistant, Typist, Field Surveyor — History, Polity, Geography, Science, Economy & Aptitude. 120 MCQs, mock test, dashboard.

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TNPSC Group 2 / 2A Practice

Revenue Officer, Sub-Inspector, Commercial Tax — History, Polity, Science, Geography, Economy & Reasoning. 120 MCQs + mock test.

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TNPSC Group 1 Practice

Deputy Collector, DSP level — advanced History, Polity, Economy, Science & Technology, Geography, and Current Affairs. 120 analytical MCQs.

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SSC CGL Practice MCQs 2025

General Intelligence & Reasoning, General Awareness, Quantitative Aptitude, and English Language — 120 bilingual Hindi+English MCQs, mock test, dashboard.

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IBPS PO Practice MCQs 2025

Reasoning Ability, Quantitative Aptitude, English Language, and Banking & Financial Awareness — 120 bilingual Hindi+English MCQs, topic drill, mock test, dashboard.

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RRB NTPC Practice MCQs 2025

Mathematics, General Intelligence & Reasoning, General Awareness, and General Science — 120 bilingual Hindi+English MCQs, topic drill, mock test, dashboard.

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UPSC CSE Practice MCQs 2025

History, Geography, Polity, Economy, Science & Technology, and Environment — 120 MCQs with explanations, topic-wise drills, and section-wise dashboard.

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Class 9 & 12 — Samacheer Kalvi Solutions

📋 Syllabus 🧮 Maths Units 📊 Blueprint ⭐ Important Q 📄 Public Exam Papers 🔬 Grade 9 Science 🧮 Grade 9 Maths Class 12 Physics Class 12 Maths Class 12 Chemistry Class 12 Bio Zoology 🧮 Score Calculator ✏️ TET Practice 🇮🇳 CTET Practice 🏛️ TNPSC TNPSC Group 4 TNPSC Group 2 TNPSC Group 1 SSC CGL IBPS PO 🚂 RRB NTPC 🏛️ UPSC CSE 📚 TET CDP 10th Revision 💡 Exam Tips ❓ FAQ
📋 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
Chapters 1–6 · ~30 marks in exam
⚗️
Chemistry
Chapters 7–11 · ~20 marks in exam
Grade 6 — Coming Soon

Chapter-wise Q&A is being built. Subjects launching soon:

🔬 Science🧮 Maths🌍 Social Science📝 English
Grade 7 — Coming Soon

Chapter-wise Q&A is being built. Subjects launching soon:

🔬 Science🧮 Maths🌍 Social Science📝 English
Grade 8 — Coming Soon

Chapter-wise Q&A is being built. Subjects launching soon:

🔬 Science🧮 Maths🌍 Social Science📝 English
Physics
9 chapters live · Textbook Q&A
⚗️
Chemistry
7 chapters live · Textbook Q&A
🌿
Biology
7 chapters live · Textbook Q&A
💻
Computer Science
LibreOffice Impress · Textbook Q&A
🧮
Mathematics
6 units live · Chapter-wise book back Q&A

🔬 Samacheer Kalvi Grade 9 Science

Grade 9 Science — Chapter-wise Q&A

Physics, Chemistry, Biology and Computer Science textbook exercises with expandable answers.

Physics
9 chapters · Textbook Q&A
⚗️
Chemistry
7 chapters · Textbook Q&A
🌿
Biology
7 chapters · Textbook Q&A

🧮 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
Set Language · Sets, operations and cardinality
🔢
Unit 2
Real Numbers · Rational and irrational numbers
🧩
Unit 3
Algebra · Polynomials, identities and equations
📍
Unit 5
Coordinate Geometry · Points and distance
📐
Unit 7
Mensuration · Area, surface area and volume
📊
Unit 8
Statistics · Data, mean, median and mode

🧮 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
Relations and Functions · 5 Exercises · 69 Questions
🔢
Unit 2
Numbers and Sequences · 9 Exercises · 95 Questions
🧮
Unit 3
Algebra · 18 Exercises · 122 Questions
📐
Unit 4
Geometry · 4 Exercises · 70 Questions
📍
Unit 5
Coordinate Geometry · 4 Exercises · 131 Questions
📏
Unit 6
Trigonometry · 4 Exercises · 59 Questions
📦
Unit 7
Mensuration · 4 Exercises · 66 Questions
📊
Unit 8
Statistics & Probability · 4 Exercises · 16 Questions

📊 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.
Appeared: 2020, 2022, 2024 · Full answer →
4M
Derive F = ma from Newton's Second Law of Motion.
Appeared: 2021, 2023, 2025 · Full answer →
4M
Explain apparent weight of a person in a lift for all cases.
Appeared: 2022, 2024 · Full answer →
Chapter 2 — Optics
7M
Explain the construction and working of a compound microscope with a ray diagram.
Appeared: 2021, 2023, 2025 · Full answer →
4M
Explain total internal reflection. State conditions and give two applications.
Appeared: 2021, 2022, 2024 · Full answer →
Chapter 4 — Electricity
7M
Derive expressions for effective resistance in series and parallel combinations with diagrams.
Appeared every year 2020–2025 · Full answer →
4M
State Ohm's Law. Draw the V-I graph and explain resistance from it.
Appeared: 2020, 2021, 2023, 2024 · Full answer →
Chapter 7 — Atoms and Molecules
4M
State and explain the Laws of Chemical Combination.
Appeared: 2021, 2022, 2024 · Full answer →
2M
Define mole. Calculate the number of molecules in 18 g of water.
Appears almost every year · Full answer →
Chapter 9 — Solutions
7M
Explain types of solutions. Define solubility and factors affecting it.
Appeared: 2020, 2023, 2025 · Full answer →
Chapter 11 — Carbon and its Compounds
7M
Explain allotropes of carbon — diamond, graphite and fullerene — with structure and properties.
Appeared: 2020, 2022, 2024, 2025 · Full answer →
Chapter 17 — Reproduction
7M
Describe sexual reproduction in flowering plants. Draw and label parts of a flower.
Appeared: 2020, 2021, 2023, 2025 · Full answer →
Chapter 18 — Genetics
7M
State Mendel's laws. Explain monohybrid and dihybrid crosses with Punnett squares.
Appeared every year 2020–2025 · Full answer →
Chapter 15 — Nervous System
7M
Describe the structure and functions of the human brain with a labelled diagram.
Appeared: 2020, 2022, 2024, 2025 · Full answer →
4M
Explain the structure of a neuron with a diagram. Describe impulse transmission.
Appeared: 2021, 2023 · Full answer →

🧮 Interactive Tool

Science Score Calculator

Enter your marks in each section to instantly see your total and pass/fail status.

Your Total Score
/ 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 guaranteed
📐
Diagrams = Extra 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 question
✍️
Write 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 marks
📄
Solve 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 method
Time 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 parts
🔁
Revise 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 retention

Brain Grain 10th Revision

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Learn Step by Step.

Type any Subject doubt from Grades 6-10 and get clear, exam-friendly guidance. Perfect for concepts, numericals, diagrams, formulas and book-back questions.

📚 Grades 6-10 🔬 Science 🧮 Maths ✍️ Exam Answers 📐 Step-by-Step Numericals 💡 Simple Explanations
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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 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.

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 10 Science 1 Mark MCQs

Practise Science one-mark public exam questions from 2026-2021 with verified answers and solutions before trying the live challenge. Open Science MCQs.

Class 10 Maths 1 Mark MCQs

Revise Maths one-mark questions by public exam year, including algebra, geometry, trigonometry, mensuration, statistics, and probability. Open Maths MCQs.

Class 10 English 1 Mark MCQs

Use English vocabulary and grammar MCQs from recent public exam sets to build quick revision confidence. Open English MCQs.

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 from 2026, 2025, 2024, 2023, 2022, and 2021 inside the site. View question papers.

10th Revision

Practise SSLC public exam 1 mark MCQs by subject and year, earn XP after OTP login, and compare your score on the leaderboard. Start 10th revision.

TNTET Paper I and II Practice

Practise bilingual Tamil Nadu Teacher Eligibility Test MCQs with syllabus PDFs, previous papers, topic drills, mock tests, and English plus Tamil question views. Start TET revision.


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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 open to use?
Yes — all 23 chapter pages including concept explanations, all book-back Q&A, MCQs, solved numericals and important questions are open for students, 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.