General Science
Heat and Temperature
Heat is a form of energy that flows from hot to cold bodies. Temperature measures the degree of hotness or coldness of an object.
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General Science
States of Matter and Their Properties
Matter exists mainly in three states: solid, liquid and gas. Each has its own shape, volume and arrangement of particles.
General Science
Atomic Structure: Atoms and Molecules
An atom is the smallest unit of matter made of protons, neutrons and electrons. Atomic structure is a high-scoring chemistry topic for SSC and Railway exams.
General Science
The Periodic Table of Elements
The periodic table arranges all known elements by increasing atomic number into periods and groups. It is one of the most asked chemistry topics in exams.
General Science
Acids, Bases and Salts
Acids taste sour, bases taste bitter, and salts form when they react. This chemistry topic with pH and indicators is common in SSC and Railway science.
General Science
Metals and Non-Metals
Metals are shiny, hard and good conductors, while non-metals are mostly dull and poor conductors. Their properties and uses appear often in exam science.
General Science
Chemical Reactions and Equations
A chemical reaction changes substances into new ones. Types of reactions, balancing equations and key examples are regularly asked in competitive science.
General Science
Carbon and Its Compounds
Carbon forms millions of compounds through catenation and covalent bonding. Allotropes, hydrocarbons and functional groups are common exam topics.
General Science
The Human Digestive System
The digestive system breaks food into nutrients the body can absorb. Its organs, enzymes and functions are frequently asked in biology sections of exams.