1. Introduction
General Science is a fixed, high-yield part of almost every Bangladeshi competitive exam — BCS (Preliminary and Written), Bank recruitment (Sonali, Bangladesh Bank, Combined), and IT-officer posts. Questions come from Physics, Chemistry, Biology, and everyday-life science and are usually direct fact-recall or one-step reasoning: units, laws, human body facts, diseases, vitamins, chemical formulas, instruments, and simple numerical relations.
Because the syllabus is broad but the questions are shallow, the winning strategy is wide coverage of well-defined facts plus a few core formulas you can apply fast. This lesson builds each idea from first principles so you not only memorize the fact but understand why it is true — which is exactly what stops you from confusing similar options in the exam hall.
2. Learning Objectives
After studying this lesson you should be able to:
- State the SI base units and derived units and convert between common units.
- Explain the core laws of motion, force, work, energy, and power, and solve one-step numericals.
- Describe heat, light, sound, electricity and magnetism at the level exams test.
- Recall the structure of the atom, the periodic table basics, acids/bases/pH, and common chemical formulas.
- Explain human body systems, vitamins, deficiency diseases, blood groups, and common diseases with their causative agents.
- Match scientific instruments to what they measure and scientists to their discoveries.
- Avoid the classic trap options examiners plant.