CBSE Class 10 Science 2026, Exam Pattern, Syllabus, Marks Distribution
CBSE Class 10 Science Weightage 2025: The Central Board of Secondary Education has published the revised Class 10 Science syllabus 2025, along with chapter-wise weightage for candidates. This revised syllabus can be accessed on the CBSE official website. With reference to the syllabus, candidates can prepare a strategic preparation plan that spans the entire syllabus and covers all topics in detail.
To assist students in preparing for the CBSE Class 10 2025 board exam, it is essential to first understand the syllabus framework and distribution of marks across chapters. Knowing the syllabus framework will help students prioritize their preparation to maximize their effort so that they address all important topics in depth. Here, discuss the chapters and units that will appear in the next board exam, as well as the Class 10 Science unit-wise weightage specific to the upcoming exam. In addition, this guide offers tips to help students prepare for the board exam.
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What Is CBSE Class 10 Science Weightage?
CBSE Class 10 Science weightage refers to the distribution of marks across different chapters and units in the syllabus. Knowing this helps students identify which topics carry more marks, so they can focus more on high-weightage chapters during their revision. The weightage impacts how students plan their study timetable, ensuring efficient preparation.
According to the latest syllabus for 2025, the total CBSE 10th Science internal assessment marks for the science paper are 80, with an internal assessment of 20 marks, making a total of 100 marks. The exam pattern includes a variety of question types such as MCQs, short answer questions, and long-answer questions, covering chapters from all five units of the syllabus.
CBSE Class 10 Science PDF download will be available here once it is officially released.
Class 10 Science Chapter-Wise Marks Distribution
The syllabus is divided into five main units, each with specific chapters that hold different mark weightages. Here's a quick overview:
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Chemical Substances – Nature and Behaviour: 25 marks
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World of Living: 25 marks
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Natural Phenomena: 12 marks
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Effects of Current: 13 marks
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Natural Resources: 5 marks
This allocation indicates the importance of each unit in your preparation, with more emphasis on topics like chemical reactions and life processes.
Chapter-wise Weightage in CBSE Class 10 Science 2025
Here's a detailed look at the CBSE Class 10 Science marking scheme. Candidates should look carefully at the Science chapters with the highest weightage in the exam as it will help them in their preparation-
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Chapter-wise Weightage in CBSE Class 10 Science 2025 |
|
|
Chapter |
Marks |
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Chemical Reactions and Equations |
6 |
|
Acids, Bases and Salts |
3 |
|
Metals and Non-Metals |
10 |
|
Carbon and its Compounds |
6 |
|
Life Processes |
9 |
|
Control and Coordination |
6 |
|
How do Organisms Reproduce? |
3 |
|
Heredity and Evolution |
7 |
|
Light - Reflection and Refraction |
10 |
|
The Human Eye and the Colourful World |
2 |
|
Electricity |
7 |
|
Magnetic Effects of Electric Current |
6 |
|
Our Environment |
5 |
Most Important Chapters for CBSE Class 10 Science 2025
Depending on the form of weightage and exam pattern, there are some Class 10 Science important chapters:
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Light - Reflection and Refraction (10 marks)
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Metals and Non-Metals (10 marks)
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Heredity and Evolution (7 marks)
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Electricity (7 marks)
Mark's weightage of these chapters is high, and they deal with basic concepts, hence make these your main concern.
Removed Chapters and Their Effects
CBSE has some Class 10 Science deleted chapters in the 2025 syllabus, including Periodic Classification of Elements, Sources of Energy, and Management of Natural Resources. This will ease your syllabus, and you can focus more on the other chapters in your syllabus, thereby having greater clarity and reduced pressure when preparing.
CBSE Class 10 Science Exam Pattern and Marking Scheme
The CBSE Class 10 Science exam lasts 3 hours, with a total of 80 marks, including short-answer and long-answer questions in Science. The question paper includes MCQs, short answer types, long answer questions, and case-based questions. Here is a brief breakdown:
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MCQs: 20 marks
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Short Answer Type - I: 12 marks
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Short Answer Type - II: 21 marks
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Long Answer Type: 15 marks
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Case Study: 12 marks
Preparing according to the CBSE Class 10 Science exam pattern ensures you are familiar with the question types and scoring expectations.
Tips for Effective Exam Preparation
Here are some high-value CBSE Class 10 exam preparation tips that must be taken into consideration while students are preparing for the exam-
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Focus on high-weightage chapters: Prioritize chapters like Light - Reflection and Refraction, Metals and Non-metals, Heredity, and Electricity.
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Practice sample papers and previous years’ questions: This helps you get comfortable with the exam pattern and improves time management.
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Develop concise answers: Practice writing short and long answers with clarity — aim for accuracy, brevity, and proper explanations.
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Revise regularly: Regular revision of chapters and formulae can boost your confidence.
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Utilize official CBSE resources: Download the latest CBSE Class 10 Science PDF and revision notes for better understanding.
CBSE Class 10 Science 2025 FAQs
Q1: Which chapters carry the highest marks in CBSE Class 10 Science 2025?
Ans: Chapters like Light - Reflection and Refraction and Metals & Non-meals have the highest weightage, each carrying 10 marks.
Q2: How can I effectively prepare for the Science exam?
Ans: Focus on MCQs for Class 10 Science, and solve previous papers to improve your speed and understanding.
Q3: Are there chapters that have been removed from the syllabus?
Ans: Yes, chapters like the Periodic Classification of Elements and Sources of Energy have been removed for 2025.
Q4: What is the total number of marks for the Science exam?
Ans: The external theory paper carries 80 marks, with 20 marks for internal assessments.
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