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Study Guide: CBSE Grade 8 Science Exam Survival Guide
Source: https://www.fatskills.com/surgery/chapter/cbse-grade-8-science-exam-survival-guide

CBSE Grade 8 Science Exam Survival Guide

By Fatskills Exam Guides Team — the exam nerds behind 28,500+ quizzes and 2.1M practice questions across 500+ global exams.

⏱️ ~2 min read

Window: Annual Exam | Units: Physics, Chemistry, Biology

Must-do topics (with how-to + examples)

  • Crop Production & Management → Tools, irrigation, storage, protection.
  • Microorganisms → Useful (antibiotics, fermentation), harmful (diseases).
  • Materials: Metals & Non-metals → Properties, uses, reactions (O₂, acids, bases).
    Ex: Zn + H₂SO₄ → ZnSO₄ + H₂↑.
  • Coal & Petroleum → Natural resources, refining, conservation.
  • Combustion & Flame → Types, zones of flame, precautions.
  • Cell Structure → Organelles (nucleus, mitochondria, chloroplast).
  • Reproduction in Animals → Asexual (binary fission, budding), Sexual (fertilisation, oviparous vs viviparous).
  • Reaching the Age of Adolescence → Hormones, changes, health.
  • Force & Pressure → Contact/non-contact forces; pressure=F/A.
  • Friction → Uses, disadvantages, methods to reduce.
  • Sound → Production, vibration, propagation, human ear.
  • Light → Laws of reflection, human eye, defects & corrections.
  • Electric Current → Symbols, heating/chemical effects.
  • Pollution of Air & Water → Causes, prevention.

Top traps (avoid)

  • Forgetting to balance chemical equations.
  • Bio diagrams unlabeled.
  • Physics numericals: missing units.
  • Mixing puberty/adolescence terms.

Time split

Bio 35% | Chem 35% | Physics 30%
Do diagrams early, numericals mid, definitions last.

Last-48h checklist

  • Redraw 8 diagrams (cell, reproductive system, eye, ear, circuit, flame, chloroplast, nephron).
  • 20 flashcards (hormones, metals vs non-metals, microorganisms).
  • 1 past paper timed.

Quick facts / formulas

  • Photosynthesis: CO₂+H₂O → Glucose+O₂.
  • Pressure = Force/Area (N/m² = Pascal).
  • Speed of sound in air ≈ 340 m/s.
  • Laws of reflection: ∠i=∠r.

Speed tactics

  • Start answers: define → explain → example/diagram.
  • Use arrows in diagrams (flow of current, direction of force).
  • Box final numerical with unit.

Exam-day mini-plan

  • Write all diagrams big & neat early.
  • Do numericals next; definitions last.
  • Keep 10 min for labels/units.