The CBSE Class 12th science exam is crucial in a student's life. Hence, they are serious about their CBSE Class 12th preparation. One of the key points in preparation is knowing the weightage of different subjects. It is very useful as it allows them to focus on the most important topics and ensure they have a strong understanding of those areas. Hence, in this article, we will mention the CBSE Class 12 Science topic-wise weightage.
CBSE Class 12th science: Overview
The Central Board of Secondary Education (CBSE) conducts the CBSE 12th science exam. The CBSE 12th Science stream usually consists of four core subjects: Physics, Chemistry, Biology/Mathematics, and English. In order to score good marks in all the subjects, it is very essential to know about the CBSE weightage for Class 12 subjects. So, let us know about the details of the CBSE Class 12 weightage of subjects.
CBSE Class 12th science Marking Scheme
The paper has 30% competency-based questions, 20% multiple-choice questions, and 50% short-answer and long-answer questions. Now, let us know about the unit-wise and topic-wise weightage of each subject for the CBSE class 12 science exam.
Marking Scheme for Physics
Just like other subjects in the CBSE science exam, the Physics examination for the Class 12th board exam is of 100 marks. Out of this, 70 marks are for the theory paper, and the rest 30 marks are for the internal assessment. The CBSE class 12th Physics paper is divided into five sections.
| Sections | Questions | Total marks |
| 1 mark questions (MCQs) | 18 | 18 |
| 2 marks questions (Short Answer Type-I) | 7 | 14 |
| 3 marks questions (Short Answer Type-II) | 5 | 15 |
| 4 marks questions (Competency-Based) | 2 | 8 |
| 5 marks questions (Long Answer Type) | 3 | 15 |
| 35 | 70 | |
| Total | 30 + 70 = 100 |
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Unit-wise and Chapter-wise weightage for Physics
| Units | Chapters | Marks |
| Unit–I | Electrostatics | |
| Chapter–1: Electric Charges and Fields | 10 marks | |
| Chapter–2: Electrostatic Potential and Capacitance | ||
| Unit-II | Current Electricity | |
| Chapter–3: Current Electricity | 6 marks | |
| Unit-III | Magnetic Effects of Current and Magnetism | |
| Chapter–4: Moving Charges and Magnetism | 8 marks | |
| Chapter–5: Magnetism and Matter | ||
| Unit-IV | Electromagnetic Induction and Alternating Currents | |
| Chapter–6: Electromagnetic Induction | 9 marks | |
| Chapter–7: Alternating Current | ||
| Unit-V | Electromagnetic Waves | |
| Chapter–8: Electromagnetic Waves | 2 marks | |
| Unit-VI | Optics | |
| Chapter–9: Ray Optics and Optical Instruments | 16 marks | |
| Chapter–10: Wave Optics | ||
| Unit-VII | Dual Nature of Radiation and Matter | |
| Chapter–11: Dual Nature of Radiation and Matter | 4 marks | |
| Unit-VIII | Atoms and Nuclei | |
| Chapter–12: Atoms | 8 marks | |
| Chapter–13: Nuclei | ||
| Unit-IX | Electronic Devices | |
| Chapter–14: Semiconductor Electronics: Materials, Devices and Simple Circuits | 7 marks | |
| Total marks | 70 marks | |
Marking Scheme for Chemistry
The marking scheme of Chemistry in the CBSE 12th science exam is the same as in Physics. The total mark is 100, and the paper is divided into theory and internal assessment. Out of this, 70 marks are for the theory paper and the rest 30 marks are for internals. The CBSE class 12th Physics paper is divided into five sections.
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| Sections | Questions | Total marks |
| 1 mark questions (MCQs) | 18 | 18 |
| 2 marks questions (Short Answer Type-I) | 7 | 14 |
| 3 marks questions (Short Answer Type-II) | 5 | 15 |
| 4 marks questions (Competency-Based) | 2 | 8 |
| 5 marks questions (Long Answer Type) | 3 | 15 |
| 35 | 70 | |
| Total | 30 + 70 = 100 |
Unit-wise and Chapter-wise weightage for Chemistry
| Units | Chapters | Marks |
| 1 | Solutions | 7 |
| 2 | Electrochemistry | 9 |
| 3 | Chemical Kinetics | 7 |
| 4 | d -and f -Block Elements | 7 |
| 5 | Coordination Compounds | 7 |
| 6 | Haloalkanes and Haloarenes | 6 |
| 7 | Alcohols, Phenols and Ethers | 6 |
| 8 | Aldehydes, Ketones and Carboxylic Acids | 8 |
| 9 | Amines | 6 |
| 10 | Biomolecules | 7 |
| Total | 70 |
Marking Scheme for Biology
The CBSE class 12th Biology exam will be of 100 marks. The practical exams are of 30 points, while the theory paper is of 70 marks. The theory paper takes 3 hours (180 minutes) and has subjective-type questions as well as MCQs.
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| Sections | Questions | Total marks |
| 1 mark questions (MCQs) | 16 | 16 |
| 2 marks questions (Short Answer Type-I) | 5 | 10 |
| 3 marks questions (Short Answer Type-II) | 7 | 21 |
| 4 marks questions (Competency-Based) | 2 | 8 |
| 5 marks questions (Long Answer Type) | 3 | 15 |
| 35 | 70 | |
| Total | 30 + 70 = 100 |
Unit-wise and Chapter-wise weightage for Biology
| Units | Chapters | Marks |
| 1 | Reproduction | 16 |
| 2 | Human Reproduction | 20 |
| 3 | Reproductive Health | 12 |
| 4 | Biotechnology and its Applications | 12 |
| 5 | Ecology and Environment | 10 |
| Total | 70 marks |
Marking Scheme for Mathematics
As per the marking guidelines, the CBSE 12th science exam is 100 marks. Out of this, 80 marks are given to the theory paper and the rest 20 marks are for internal assessments. The students are given 3 hours to attempt the theory paper for 80 marks.
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Unit-wise and Chapter-wise weightage for Mathematics
| Sections | Questions | Total marks |
| 1 mark questions (MCQs) | 20 | 20 |
| 2 marks questions (Short Answer Type-I) | 5 | 10 |
| 3 marks questions (Short Answer Type-II) | 6 | 18 |
| 4 marks questions (Competency-Based) | 3 | 12 |
| 5 marks questions (Long Answer Type) | 4 | 20 |
| 38 | 80 | |
| Total | 20 + 80 = 100 marks |
In conclusion, to excel in this exam, understanding the topic-wise weightage of each subject is important. The weightage provides the distribution of marks across different units and chapters. It allows students to prioritize their preparation effectively. Hence, we have provided the marking scheme as well as chapter-wise weightage for CBSE 12th science exam. Furthermore, keep following our blogs to get all the latest updates regarding the CBSE class 12 science examination.
FAQs on CBSE Class 12 Science
1. What is a good percentage in class 12 science?
Ans- Usually, scoring above 90% in CBSE Class 12th Science is considered good. These marks can help in admission to top colleges and universities for further studies. It can also help in getting scholarships.
2. Which is the easiest chapter in physics class 12?
Ans- It can vary from student to student, depending on individual strengths, interests, and learning styles. However, here are some chapters that are considered easy.
- Coulomb's Law of Vectors.
- Gauss's law of applications.
- Electric dipole in the external electric field.
- Electric dipole on axial.
3. What is the weightage for CBSE Board Exam 2023?
Ans- The examination consists of a different type of question. About 30% of the questions are competency-based, 20% are multiple-choice questions, and the remaining 50% are a combination of short-answer and long-answer questions.