CBSE Class 10 Science Syllabus 2026-27: Revised & Deleted Topics

CBSE 2026-27 syllabus for Class 10 Science is expected to be released by the end of April. In this article, we have provided a summary of everything we know about Class 10 Science syllabus so far.

CBSE Class 10 Science Syllabus 2026-27 Overview

Class 10 Science syllabus PDF balances conceptual learning, real-life application and exam readiness.

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CBSE Class 10 Science Syllabus 2026-27 Overview

The CBSE Class 10 Science syllabus 2026-27 includes Physics, Chemistry and Biology units with an 80 marks theory paper and 20 marks practical/ internal assessment. The paper structure continues to focus on competency-based, diagram-based and case-study questions.

The official Science syllabus PDF for 2026-27 has not been uploaded by CBSE yet. We will update this page as soon as the confirmed document is released.

Until then, students can follow the 2025-26 syllabus structure, as no structural revisions have been announced so far.

CBSE Class 10 Science Syllabus 2026-27: Subject-wise Breakdown

The CBSE Class 10 Science syllabus for 2026-27 (based on 2025-26 trends) features an 80-mark theory paper and 20-mark internal assessment, focusing heavily on competencies, case-based, and assertion-reasoning questions.

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Question Paper Format

Based on CBSE 2025 sample paper, this is the expected question paper design for 2026-27 CBSE Class 10 Science board exam.

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The board paper includes:

• MCQs (Multiple Choice Questions)
• Very short and short answer questions
• Long answer questions
• Case-based and competency-based questions

Most questions are directly based on NCERT textbooks, examples and diagrams.

Also don’t miss checking the best science book for class 10 for important questions and exam-level practice

Biology Syllabus for Class 10 CBSE (2026-27)

Biology helps students understand life processes, heredity and environmental balance in a clear and relatable way.

• Life Processes

Students learn about nutrition, respiration, transportation and excretion in plants and animals, focusing on how essential life functions are carried out.

• Control and Coordination

This chapter explains how the nervous system and hormones control and coordinate activities in the human body and plants.

• How Do Organisms Reproduce

Students study asexual and sexual reproduction, the human reproductive system and basic ideas of reproductive health in a scientific and age-appropriate manner.

• Heredity

This unit introduces genetics, inheritance of traits, Mendel’s experiments and how characteristics are passed from parents to offspring.

• Environment and Natural Resources

Students learn about ecosystems, food chains, food webs, environmental balance and the importance of conserving natural resources.

Chemistry Syllabus for Class 10 CBSE (2026-27)

Chemistry helps students understand substances, reactions and materials commonly used in daily life.

• Chemical Reactions and Equations

Students learn how chemical reactions occur, how to write and balance chemical equations, and understand different types of reactions such as combination, decomposition, displacement and redox reactions.

• Acids, Bases and Salts

This unit explains the properties of acids, bases and salts, the pH scale, indicators and everyday chemicals like baking soda, washing soda and plaster of Paris.

• Metals and Non-Metals

Students study physical and chemical properties of metals and non-metals, extraction of metals, corrosion and its prevention, along with their uses in daily life.

• Carbon and Its Compounds

An important and high-weightage chapter that introduces organic chemistry concepts such as covalent bonding, hydrocarbons, ethanol, ethanoic acid, soaps and detergents.

Physics Syllabus for Class 10 CBSE (2026-27)

Physics helps students understand natural phenomena like light and electricity through clear concepts and real-life applications.

• Light - Reflection and Refraction

Students study reflection from mirrors and refraction through lenses. The focus is on ray diagrams, image formation, mirror and lens formulas, magnification and everyday applications of light.

• The Human Eye and the Colourful World

This unit explains the structure and working of the human eye, common defects of vision and their correction. Students also learn about scattering of light and related atmospheric phenomena.

• Electricity

One of the most scoring units, it covers electric current, potential difference, resistance, Ohm’s Law, electric circuits, electrical power and numericals based on formulas.

• Magnetic Effects of Electric Current

Students learn about magnetic fields, force on a current-carrying conductor, Fleming’s Left Hand Rule and Right Hand Rule, and basic principles of electromagnetism used in technology.

Internal Assessment for Class 10 Science (20 Marks)

Internal assessment plays a crucial role and should not be taken lightly.

• Periodic Tests: 10 Marks
• Practical Work / Lab Activities: 5 Marks
• Portfolio / Assignments: 5 Marks

Regular lab work and record completion can easily secure these marks.

Class 10 Science Question Paper Design (Competency-based)

Competency-based question papers for Class 10 Science focus on applying concepts to real-life scenarios rather than rote memorization, constituting 50% or more of the exam.

To cover the syllabus along with exam-oriented questions, many students prefer using the best science book for class 10.

Designed based on NCERT curriculum, these papers include case studies, data interpretation, and situational problems featuring MCQ and subjective questions with detailed rubrics. 

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Class 10 Science 2026-27 Practical List

Practicals should be conducted alongside the concepts taught in theory classes.

1. A. (Unit I) Finding the pH of the following samples by using pH paper/ universal indicator:

• Dilute Hydrochloric Acid
• Dilute NaOH solution
• Dilute Ethanoic Acid solution
• Lemon juice
• Water
• Dilute Hydrogen Carbonate solution

B. (Unit I) Studying the properties of acids and bases (HCl & NaOH) based on their reaction with:

• Litmus solution (Blue/ Red)
• Zinc metal
• Solid sodium carbonate

2. (Unit I) Performing and observing the following reactions and classifying them into

A. Combination reaction

B. Decomposition reaction

C. Displacement reaction

D. Double displacement reaction

• Action of water on quicklime
• Action of heat on ferrous sulphate crystals
• Iron nails kept in copper sulphate solution
• Reaction between sodium sulphate and barium chloride solutions

3. A. (Unit I) Observing the action of Zn, Fe, Cu, and Al metals on the following salt solutions:

• ZnSO₄(aq)
• FeSO₄(aq)
• CuSO₄(aq)
• Al₂(SO₄)₃(aq)

Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on the above result.

4. (Unit IV) Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determining its resistance. Also plotting a graph between V and I.

5. (Unit IV) Determination of the equivalent resistance of two resistors when connected in series and parallel.

6. (Unit II) Preparing a temporary mount of a leaf peel to show stomata.

7. (Unit II) Experimentally show that carbon dioxide is given out during respiration.

8. (Unit I) Study of the following properties of acetic acid (ethanoic acid):

• Odour
• Solubility in water
• Effect on litmus
• Reaction with Sodium Hydrogen Carbonate

9. (Unit I) Study of the comparative cleaning capacity of a sample of soap in soft and hard water.

10. (Unit III) Determination of the focal length of:

• Concave mirror; and
• Convex lens; by obtaining the image of a distant object.

11. (Unit III) Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, and angle of emergence and interpret the result.

12. (Unit II) Studying (a) binary fission in Amoeba, and (b) budding in yeast and Hydra with the help of prepared slides.

13. (Unit III) Tracing the path of the rays of light through a glass prism.

14. (Unit II) Identification of the different parts of an embryo of a dicot seed (peas, gram, or red kidney bean).

How to Study Class 10 Science Effectively Without Pressure?

Studying Science does not require long hours but it requires the right approach.

1. NCERT Is Your Best Friend

Every definition, diagram and example in NCERT is exam-relevant. No extra books are needed if NCERT Book is done thoroughly.

2. Concept Before Cramming

Try to understand why something happens instead of memorising it. Science becomes easier when logic replaces rote learning.

3. Diagrams Matter

Practise neat and labelled diagrams, especially in Biology and Physics. Diagrams fetch easy marks.

4. Numericals = Practice

For Physics and Chemistry, regular numerical practice improves speed and accuracy.

5. Revise Smartly

Short notes, formula lists and chapter-wise revision once a week help concepts stay fresh.

Why Class 10 Science is Important for CBSE Class 10 Board Exams

Class 10 Science is one subject that quietly supports every other subject you study. It trains your brain to think logically, ask the right questions and understand why things happen and  skills that make board exams feel more manageable and less confusing.

By studying Science, you learn to:

• Think scientifically and logically instead of guessing answers
• Try to comprehend how everyday things like electricity, machines, food and the human body actually work
• Build a strong base for Class 11 subjects, especially Physics, Chemistry and Biology
• Score well in exams by focusing on clear concepts and NCERT-based answers

No matter which stream you choose after Class 10, be it  Science, Commerce or Humanities, the thinking habits you develop through Science stay with you. They help you analyse questions better, write clearer answers and feel more confident not only in exams, but in real life too.

FAQs

Q1. How many units are there in Class 10 Science 2026-27?

Ans. The syllabus is divided into Chemical Substances, World of Living, Natural Phenomena, Effects of Current, Natural Resources, and more.

Q2. How many marks are allotted for practicals?

Ans. Science includes 20 marks for practical and internal assessment combined.

Q3. Are diagrams important in the board exam?

Ans. Yes. Biology and Physics answers require properly labelled diagrams for full marks.

Q4. Will competency-based questions increase in 2027?

Ans. CBSE has consistently increased competency-based question weightage over recent years.

Q5. Is NCERT enough for theory preparation?

Ans. Yes. Every board question is framed strictly from NCERT concepts and examples.