CBSE Class 10 Science: Previous Year Questions Analysis — Chapter-Wise Trends 2026

Highest Weightage Chapters

• Chemical Reactions & Equations: 5-7 marks — balancing, types of reactions always tested
• Electricity: 8-10 marks — numericals on resistance, power, Joule's law (MOST IMPORTANT)
• Life Processes: 8-10 marks — digestion, respiration, circulation diagrams
• Light: Reflection & Refraction: 7-10 marks — ray diagrams, mirror/lens formula
• Heredity & Evolution: 5-7 marks — Mendel's cross, sex determination

Case Study Question Patterns

• Science case studies typically use data tables, experimental setups, or real-life scenarios
• Most common in: Electricity (circuit analysis), Metals & Non-metals (reactivity), Life Processes (diagrams)
• Strategy: Read the passage first, then attempt questions — answers are usually directly stated

Most Repeated Question Types

• Balance the given chemical equation and identify the type of reaction
• Draw ray diagram for image formation by concave mirror/convex lens
• Calculate equivalent resistance and current in a circuit
• Draw labelled diagram of human heart / digestive system
• Cross between Tt × Tt — show F2 genotypic and phenotypic ratio

Prediction for 2026

• Expect at least 2 numericals in Physics section (electricity, light)
• One case study from Chemistry (reactions or periodic table)
• Diagram questions in Biology (heart, nephron, or brain)
• Assertion-Reason questions across all three sections