General Science (15 marks) and Computer & IT (15 marks) together carry 30 marks in BCS Preliminary — yet these are the two sections with the highest score variance between candidates. Top scorers get 12–14 out of 15 in each. Average candidates get 6–8. The difference is purely preparation strategy, not intelligence. Both sections are heavily factual and highly predictable.
| Science Topic | Questions | Must-Know Facts |
|---|---|---|
| Human Biology | 3–4 | Blood groups (ABO system), human chromosomes (46), heart chambers (4), bone count (206), cranial nerves (12) |
| Physics Basics | 2–3 | Speed of light (3×10⁸ m/s), sound in air (343 m/s), Newton's laws, SI units, electromagnetic spectrum order |
| Chemistry Basics | 2–3 | Periodic table periods (7), groups (18), water formula (H₂O), CO₂ in atmosphere (0.04%), acid/base pH |
| Biology — Plants | 2 | Photosynthesis equation, chlorophyll function, plant hormones, seed germination conditions |
| Environment & Ecology | 2 | Greenhouse gases (CO₂, CH₄, N₂O), ozone layer (stratosphere), deforestation impact, climate change |
| Everyday Science | 2–3 | Why sky is blue (Rayleigh scattering), why sea is salty, how vaccines work, pasteurisation, X-ray inventor |
150+ BCS Science MCQs covering human biology, physics, chemistry and everyday science — all from previous BCS papers 38th to 46th. Track chapter-wise accuracy and focus on weak areas.
MS Word shortcuts: Ctrl+B (Bold), Ctrl+I (Italic), Ctrl+U (Underline), Ctrl+Z (Undo), Ctrl+S (Save), Ctrl+P (Print).
Key founders: Bill Gates (Microsoft, 1975), Steve Jobs & Steve Wozniak (Apple, 1976), Mark Zuckerberg (Facebook, 2004), Larry Page & Sergey Brin (Google, 1998).
Data units: 1 Byte = 8 bits, 1 KB = 1024 Bytes, 1 MB = 1024 KB, 1 GB = 1024 MB, 1 TB = 1024 GB.
Take a 15-question timed quiz on Computer hardware, networking, internet and Digital Bangladesh. Instant scoring — see exactly which ICT topics need more attention before your BCS exam.
Not sure where to start or how to fix weak subjects? Our AI Career Advisor analyses your profile — academic background, district, target cadre and time available — and gives you a custom study roadmap, completely free.
💬 Talk to Career Advisor →