General Science Revision Master

5 min

High-yield mixed revision of physics, chemistry and biology for competitive exams

Golden Rule of Science Revision

Competitive exams test exact scientific facts, SI units, and chemical formulas repeatedly. Master core concepts and avoid common examiner traps to score full marks in science.

Why This Matters

General science constitutes 15-20% weightage in SSC, RRB, and State exams.
Direct static factual questions ensure quick scoring without complex calculation.
Avoiding negative marking in traps gives a massive rank boost.

Power Memory Hooks

OIL RIG: Oxidation Is Loss, Reduction Is Gain of electrons.
ROY G BIV: Order of colors in visible light spectrum (Red to Violet).
EMF is not a force, it's work done per unit charge (Volts).

Core Science Quick Reference

Quantity / Compound	SI Unit / Formula	Exam Key Fact
Electric Current	Ampere (A)	Scalar quantity with direction
Washing Soda	Na₂CO₃·10H₂O	Sodium carbonate decahydrate
Power of Lens	Diopter (D)	Inversely proportional to focal length
Bile Juice	Produced in Liver	Stored in gall bladder, no enzymes

Visual Science Mindmap

pH Scale

(Acidity to Basicity)

Acidity to Basicity

pH below 7 is acidic while above 7 is basic.

Mitochondria

(Powerhouse of Cell)

Powerhouse of Cell

It synthesizes ATP molecules during cellular respiration.

Ohm's Law

(V equals IR)

V equals IR

Voltage is directly proportional to current at constant temperature.

Heavy Water

(Deuterium Oxide)

Deuterium Oxide

Used as a moderator in nuclear reactors (D₂O).

Common Exam Traps

Sound waves can travel through vacuumSound waves require material medium

Sound is a mechanical wave; light is electromagnetic and travels in vacuum.

Bile juice contains digestive enzymesBile juice has NO digestive enzymes

Bile only helps in emulsification of fats, not chemical digestion.

Diamond is a good conductor of electricityDiamond is a bad conductor, Graphite is good

All carbon valencies are bonded in diamond; graphite has free electrons.

Quick Exam Check

Q1.Which chemical compound is commonly known as 'Plaster of Paris'?

Q2.Which of the following blood groups is known as the universal recipient?

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