General Science: Units, Formulae and Biological Facts
What to master
Physics: units and measurement, motion, force and Newton's laws, work–power–energy, heat, light (reflection, refraction), sound, simple electricity and magnetism. Chemistry: atomic structure, periodic table basics, acids–bases–salts, metals and non-metals, common compounds and alloys. Biology: the cell and its organelles, human body systems, vitamins and deficiency diseases, blood groups, plant physiology and basic classification.
Army science questions are almost always one-line factual recall, so maintain your own compact tables of units, formulae, symbols and scientific names instead of reading long passages.
Traps
- SI units: force - newton (N), pressure - pascal (Pa), power - watt (W), energy - joule (J), frequency - hertz (Hz), resistance - ohm. Do not mix power with energy.
- Symbol vs formula: Na is a symbol; Na₂O is a formula; NaCl is common salt.
- Deficiency diseases: night blindness ↔ vitamin A, scurvy ↔ C, rickets ↔ D, beri-beri ↔ B₁, anaemia ↔ iron/B₁₂.
- In "which is NOT correct" items, circle the negative word before you judge the options.
Worked rule
Mass is constant everywhere; weight W = mg changes with gravity. That one distinction alone answers a large family of questions about the Moon, satellites and weighing instruments.