# CBSE Class 10 Science Syllabus 2026-27, Unit Marks | SwaVid

CBSE Class 10 Science syllabus 2026-27: 80 marks theory, 3 hours and 20 marks internal. Official marks, unit by unit, with the source page linked.

Canonical: https://www.swavid.com/cbse/class-10/science/syllabus

Source: https://www.swavid.com/cbse/class-10/science/syllabus

# Class 10 Science Syllabus 2026-27

## Unit-wise marks

## Internal assessment: 20 marks

## Paper design

## Topics in each unit

## Good to know

## Practise this syllabus

## Questions parents ask

## Find the earlier idea your child is missing

### Unit I

### Unit II

### Unit III

### Unit IV

### Unit V

### Board paper questions

### Sample paper 2026-27

### Class 10 Science

CBSE’s official unit marks, the chapters in each unit and the paper design.

CBSE prints marks for units, not for individual chapters.

Theory is 80 marks. CBSE prints marks for each unit, not for each chapter.

Source : CBSE Curriculum 2026-27, Class X Science (Subject Code 086) , p.4

CBSE does not publish marks for individual chapters. A claim such as “one chapter carries 6 marks” is not from CBSE. Use the unit marks.

Short answer. The Class 10 Science theory paper is 80 marks and 3 hours. Another 20 marks are internal assessment. The marks are split over 5 units: Chemical Substances - Nature and Behaviour 25, World of Living 25, Natural Phenomena 12, Effects of Current 13 and Natural Resources 5.

Source : CBSE Curriculum 2026-27, Class X Science (Subject Code 086) , p.4

Checked against the official CBSE pages on 3 November 2026. 2026-27 is the latest curriculum CBSE has published.

Source : CBSE Curriculum 2026-27, Class X Science (Subject Code 086) , pp.4, 9

The skill mix CBSE prints for the Science paper.

Internal choice is about 33% of the paper.

Source : CBSE Curriculum 2026-27, Class X Science (Subject Code 086) , p.9

The topic groups CBSE prints under each unit.

Chemical Reactions and Equations; Acids, Bases and Salts; Metals and Non-metals; Carbon and its Compounds (Periodic Classification formative only)

Life Processes; Control and Co-ordination; Reproduction; Heredity (Evolution formative only)

Light - Reflection, Refraction, Spherical lens, Human eye, Prism/dispersion

Electric current, Ohm's law, resistance, heating effect, electric power, Magnetic effects of current, AC/DC, Domestic circuits (Motor, EM Induction, Generator formative only)

Our Environment

Source : CBSE Curriculum 2026-27, Class X Science (Subject Code 086) , pp.4-6

CBSE prints boxed notices that these topics are assessed formatively only, not in the year-end exam: Periodic Classification of Elements; Evolution; and Motor, Electromagnetic Induction and Electric Generator.

Source : CBSE Curriculum 2026-27, Class X Science (Subject Code 086) , pp.4, 5, 6

The board exam covers the whole Class 10 syllabus. A student needs 33% separately in the external exam and in internal assessment.

Source : Introduction to Secondary Curriculum Part-1 2026-27 (Scheme of Studies) , pp.24-25

Solved CBSE Class 10 Science papers, with the marks for each question.

The official sample paper and marking scheme from CBSE.

Syllabus, sample paper and past papers for this subject on one page.

The theory paper is 80 marks and 3 hours. Another 20 marks are internal assessment.

Chemical Substances - Nature and Behaviour carries the most, 25 of the 80 marks.

No. CBSE publishes marks per unit only. Chapter-wise weightage tables on other sites are not from CBSE.

Yes. CBSE released the 2026-27 sample question papers and marking schemes on 21 September 2026. The sample paper page for this subject links the official files.

SwaVid finds the earlier idea a student is missing, repairs it, then teaches the topic step by step.

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- SwaVid
- CBSE
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- Syllabus 2026-27
- 80 marks theory
- 3 h board paper
- 20 internal

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- [CBSE Curriculum 2026-27, Class X Science (Subject Code 086)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Science_SecP1_2026-27.pdf)
- [CBSE Curriculum 2026-27, Class X Science (Subject Code 086)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Science_SecP1_2026-27.pdf)
- [CBSE Curriculum 2026-27, Class X Science (Subject Code 086)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Science_SecP1_2026-27.pdf)
- [CBSE Curriculum 2026-27, Class X Science (Subject Code 086)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Science_SecP1_2026-27.pdf)
- [CBSE Curriculum 2026-27, Class X Science (Subject Code 086)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Science_SecP1_2026-27.pdf)
- [CBSE Curriculum 2026-27, Class X Science (Subject Code 086)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Science_SecP1_2026-27.pdf)
- [Introduction to Secondary Curriculum Part-1 2026-27 (Scheme of Studies)](https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart1/Curriculum_SecP1_2026-27.pdf)
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