The Central Board of Secondary Education (CBSE) Class 10 Science exam is designed to assess students' understanding of scientific concepts, practical skills, and application-based knowledge. Below is an overview of the exam pattern and sample questions based on the latest CBSE guidelines. ### **CBSE Class 10 Science Exam Pattern (2025)** 1. **Total Marks**: 100 - Theory: 80 Marks - Internal Assessment: 20 Marks 2. **Theory Paper Duration**: 3 Hours 3. **Question Paper Structure**: - **Section A**: 20 MCQs (1 mark each) - **Section B**: 6 Very Short Answer Questions (2 marks each) - **Section C**: 7 Short Answer Questions (3 marks each) - **Section D**: 3 Long Answer Questions (5 marks each) 4. **Internal Assessment (20 Marks)**: - Periodic Tests: 10 Marks - Practical Work: 5 Marks - Portfolio: 5 Marks --- ### **Sample Questions for CBSE Class 10 Science Exam** #### **Section A: MCQs (1 Mark Each)** 1. Which of the following is a non-renewable source of energy? a) Solar energy b) Wind energy c) Coal d) Hydropower 2. The chemical formula of baking soda is: a) NaHCO₃ b) NaOH c) NaCl d) Na₂CO₃ 3. The process of conversion of sugar into alcohol is called: a) Fermentation b) Respiration c) Photosynthesis d) Combustion --- #### **Section B: Very Short Answer Questions (2 Marks Each)** 4. Define the term "refraction of light." Give one example. 5. Write the balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid. 6. Name the hormone responsible for regulating blood sugar levels in humans. --- #### **Section C: Short Answer Questions (3 Marks Each)** 7. Explain the process of photosynthesis with a labeled diagram. 8. Differentiate between renewable and non-renewable sources of energy with examples. 9. Describe the structure and function of a neuron. --- #### **Section D: Long Answer Questions (5 Marks Each)** 10. Explain the process of digestion in humans with a labeled diagram of the digestive system. 11. Describe Mendel’s experiments with pea plants and the laws of inheritance derived from them. 12. Explain the working of an electric motor with a labeled diagram. --- ### **Important Topics for CBSE Class 10 Science** 1. **Chemical Reactions and Equations** 2. **Acids, Bases, and Salts** 3. **Metals and Non-Metals** 4. **Life Processes** 5. **Control and Coordination** 6. **Electricity** 7. **Magnetic Effects of Electric Current** 8. **Sources of Energy** 9. **Heredity and Evolution** 10. **Light – Reflection and Refraction** --- ### **Preparation Tips** 1. Focus on NCERT textbooks as they are the primary resource for CBSE exams. 2. Practice diagrams and labeling for biology and physics topics. 3. Solve previous years' question papers and sample papers. 4. Revise important chemical reactions and equations. 5. Pay attention to numerical problems in electricity and light.