Top 10 Science Topics to Revise Before Any Competitive Exam

Why Science Questions Are Easy Marks

Unlike Current Affairs or History, General Science questions in competitive exams are highly repetitive. The same concepts appear year after year in slightly different forms. Master these 10 topics and you've covered roughly 70% of all General Science questions asked in SSC CGL, Railways RRB, and UPSC Prelims.

The Top 10 Topics

1. Human Body Systems

Digestive, circulatory, respiratory, and nervous systems. Focus on organs, their functions, and common diseases. Questions like "Which organ produces bile?" or "What is the normal RBC count?" are evergreen.

2. Newton's Laws of Motion

All three laws, along with applications like friction, inertia, and momentum. At least 2–3 questions per exam paper come from this topic.

3. Acids, Bases & Salts

pH scale, litmus test, common acids and their uses (HCl, H₂SO₄, HNO₃), baking soda vs baking powder — all frequently tested.

4. Vitamins & Deficiency Diseases

This is pure memorisation but high-yield. Vitamin A → Night blindness. Vitamin C → Scurvy. Vitamin D → Rickets. Learn the full table.

5. Electricity & Magnetism

Ohm's Law, series vs parallel circuits, electromagnets, and applications. Formula-based questions from this section are common in Railways.

6. Cell Biology

Cell organelles and their functions, mitosis vs meiosis, DNA basics. Usually 2 questions per paper.

7. Light & Optics

Reflection, refraction, lenses, mirrors, human eye defects (myopia, hypermetropia). Common in SSC and state exams.

8. Periodic Table Basics

First 20 elements, groups and periods, metal vs non-metals, valency. Questions like "Which is the most electronegative element?" are standard.

9. Ecosystem & Food Chains

Producers, consumers, decomposers; energy flow in ecosystems; endangered species. Growing in importance for UPSC Prelims.

10. Space Science

Planets, satellites, ISRO missions, black holes, light years. At least 1–2 questions in almost every modern competitive exam.

How to Use QuizAll for These Topics

Browse to Subject → Science on QuizAll and filter by each topic listed above. Set a target of 30 questions per topic before moving on. Review wrong answers carefully — most mistakes in science come from confusing similar facts, not from lack of understanding.