Tamil Nadu State Board · Class 10 Science

Samacheer Class 10 Science Book Back Answers

Class 10 Science textbook solutions for the Tamil Nadu SSLC public exam — Physics, Chemistry, and Biology, with verified answers and clear explanations.

🧪 Class 10 Science Formula Sheet — all Physics & Chemistry formulas → ⭐ Class 10 Science Important Questions →

Samacheer Kalvi Class 10 Science is a single combined subject in the Tamil Nadu SSLC public exam, made up of three streams — Physics, Chemistry, and Biology. Because all three share one paper, scoring well means staying comfortable across motion and electricity, chemical reactions and the periodic table, and human and plant biology. This page organises every chapter by stream so you can revise the area you need.

You'll find free, chapter-wise Class 10 Science book back answers for the full textbook. Each chapter page gives the questions with verified answers and short, exam-focused explanations — useful for homework, for revising a single chapter, or for a fast recap the day before the exam. The explanations are in simple English with Tamil-medium students in mind.

For the best results, read the book back answers, then test recall with the timed revision challenge and previous-year public exam papers. Building Class 9 basics first? See the Class 9 Science solutions.

Physics

Chemistry

Biology

📊 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

Frequently Asked Questions

What does the Samacheer Class 10 Science syllabus cover?

It combines Physics (Laws of Motion, Optics, Electricity, Acoustics, Nuclear Physics and more), Chemistry (Atoms and Molecules, Periodic Classification, Carbon and its Compounds and more), and Biology (plant and animal physiology, Genetics, Reproduction, Health and Environmental Management).

Where can I get Class 10 Science book back answers for the SSLC exam?

Brain Grain offers free chapter-wise Class 10 Science book back answers for Physics, Chemistry and Biology. Open any chapter above to read verified answers with simple explanations, then practise with the revision challenge.

Are the Class 10 Science solutions in Tamil or English?

Solutions are in simple English with Tamil-friendly support, suitable for both Tamil-medium and English-medium SSLC students.

How do I revise Class 10 Science quickly before the exam?

Revise Physics, Chemistry and Biology separately using the book back answers, focus on diagrams, definitions and important formulae, then attempt mixed MCQs and previous-year public exam questions to test recall.

Continue on Brain Grain

Use these Class 10 Science book back answers for revision, homework, textbook solutions, and public exam preparation.

Class 10 Maths Class 9 Science Public Exam Papers Revision Challenge