General Science — SSC CGL Study Notes
Overview
General Science forms a critical component of the General Awareness section in SSC CGL Tier 1, typically contributing 10–15 questions out of 25. This section tests fundamental concepts from Physics, Chemistry, and Biology at the Class 10 level. The questions are designed to assess your understanding of basic scientific principles, everyday applications, and factual knowledge rather than complex problem-solving.
Success in General Science requires clarity on core concepts across all three branches. Questions often relate to practical applications—why the sky is blue, how vaccines work, what causes rusting—making this section accessible through real-world connections. Unlike other GA topics that demand extensive memorization, General Science rewards conceptual understanding combined with selective fact retention. Students should focus on fundamental laws, common phenomena, human body systems, and everyday chemistry rather than attempting to memorize entire textbooks.
The distribution is roughly equal among Physics, Chemistry, and Biology, so balanced preparation across all three is essential. This section can be a scoring area for students with science backgrounds but remains manageable for arts/commerce students who focus on high-yield topics systematically.
Key Concepts
- **Physics focuses on basic laws and phenomena**: Newton's laws of motion, work-energy-power relationships, basic electricity concepts (current, voltage, resistance), properties of light (reflection, refraction, dispersion), and everyday applications like why objects float, how levers work, and electromagnetic induction principles.
- **Chemistry emphasizes substance properties and reactions**: Understand the periodic table organization (groups, periods, metals/non-metals), acid-base concepts including pH scale and neutralization, types of chemical reactions (combination, decomposition, displacement), and common substances like salts, metals, and organic compounds.
- **Biology centers on human body systems and life processes**: The digestive, circulatory, respiratory, excretory, and nervous systems; basic cell structure and function; photosynthesis and respiration; vitamins and deficiency diseases; blood groups and immunity; and common diseases with their causes.
- **Measurement and units appear regularly**: SI units for fundamental quantities (meter, kilogram, second, ampere, kelvin), derived units (newton, joule, watt, pascal), and unit conversions form the foundation for numerical understanding.
- **Scientific discoveries and inventions are testable facts**: Who discovered/invented what, Nobel Prize winners in science, major scientific milestones, and the scientists associated with fundamental laws and theories.