The CBSE Class 10 Science marking scheme 2026, released by the Central Board of Secondary Education, provides a structured framework for assessing students in Physics, Chemistry and Biology. The total marks for Science are 100, out of which 80 marks are allotted to the theory examination and 20 marks to internal assessment. The marking scheme aims to ensure uniformity, fairness and transparency in evaluation across all examination centres.
The theory question paper is designed to test conceptual clarity and application
The Science theory paper carries 80 marks and includes a mix of multiple-choice, short-answer and long-answer questions. Questions are framed to test students’ understanding of scientific concepts rather than rote memorisation. Case-based and assertion–reason questions have been introduced to evaluate analytical thinking and real-life application of scientific principles.
Physics, Chemistry and Biology receive balanced representation in marks distribution
The Science paper is divided across three core disciplines — Physics, Chemistry and Biology. Each unit contributes proportionately to the overall paper, ensuring comprehensive syllabus coverage. Numerical problems in Physics, chemical equations in Chemistry and diagram-based questions in Biology carry specific marks as per the marking scheme, with clear instructions for partial credit.
Step-wise marking is strictly followed in numerical and reasoning-based answers
CBSE examiners follow a step-wise marking approach, especially for Physics numericals and Chemistry calculations. Students are awarded marks for correct formulas, substitutions and logical steps even if the final answer is incorrect due to minor errors. In Biology, marks are awarded for correct terminology, structured explanations and labelled diagrams.
Internal assessment accounts for practical skills and year-long performance
The internal assessment component of 20 marks is conducted at the school level and includes periodic tests, practical work, lab activities, projects and subject enrichment exercises. This component evaluates students’ experimental skills, observation accuracy, record maintenance and consistency throughout the academic year.
Practical-based understanding is indirectly assessed through theory questions
Although there is no separate practical exam in Class 10 Science, practical understanding is tested through application-based questions. Diagrams, experiments and lab-based concepts are frequently used in theory papers. Students are expected to understand procedures, outcomes and scientific reasoning behind experiments.
Presentation and scientific accuracy play a vital role in scoring high marks
The marking scheme emphasises clarity, accuracy and proper use of scientific terms. Diagrams must be neat, correctly labelled and relevant to the question asked. Answers must be precise and structured, avoiding unnecessary information. Writing exact definitions and balanced chemical equations is essential for full marks.