The Central Board of Secondary Education (CBSE) conducts the Class 10 board exams, which are an important milestone in a student's academic journey. The science subject plays a significant role in the Class 10 board exams, as it carries a substantial weightage.


The marks distribution for the science subject in the CBSE Class 10 board exams is as follows:

Unit 1: Chemical Substances - Nature and Behavior
- This unit focuses on the understanding of chemical substances, their properties, and behavior.
- It carries a weightage of 25 marks, which is further divided into theory and practical components.
- The theory section constitutes approximately 18 marks, while the practical component carries around 7 marks.

Unit 2: World of Living
- This unit encompasses topics related to living organisms, their processes, and characteristics.
- It carries a weightage of 23 marks, with the theory section accounting for approximately 15 marks and the practical component for around 8 marks.

Unit 3: Natural Phenomena
- This unit deals with natural phenomena such as light, electricity, and natural resources.
- It carries a weightage of 12 marks, with the theory section contributing around 8 marks and the practical component around 4 marks.

Unit 4: Effects of Current
- This unit focuses on the effects of electric current and its applications.
- It carries a weightage of 13 marks, with the theory section accounting for approximately 10 marks and the practical component for around 3 marks.

Unit 5: Natural Resources
- This unit covers topics related to conservation and management of natural resources.
- It carries a weightage of 7 marks, with the theory section contributing around 5 marks and the practical component around 2 marks.

Practical Work
- The practical component of the science subject carries a weightage of 30 marks.
- It includes practical experiments, record keeping, and the evaluation of laboratory skills.


In the CBSE Class 10 board exams, the science subject holds significant importance as it carries a total weightage of 90 marks. Students should focus on understanding the concepts, theories, and practical applications of various topics within the subject to perform well in the exams. Regular practice, revision, and effective time management can help students achieve good scores in their science exams.