Compulsory Subject 3 ;CSS General Science & Ability (GSA)

CSS General Science & Ability (GSA) combines basic sciences (60 marks) with quantitative reasoning (40 marks). It’s a 100-mark paper with 20% MCQs, ideal for scoring 65+ with consistent practice.

Paper Pattern (100 Marks, 3 Hours)

Section	Marks	Content
Part I: General Science	60 (12 MCQs)	Physical/Biological/Environmental Sciences
Part II: General Ability	40 (8 MCQs)	Quantitative Ability, Logical Reasoning
Subjective	80	Attempt 4/8 questions (2 from each Part)

Passing: 40/100. Toppers target 70+ (Science 45+, Math 30+).

Part I: General Science (60 Marks) – Key Topics

Physical Sciences (25 marks)

• Universe: Solar system, galaxies, Big Bang, stars lifecycle
• Matter/Energy: Atoms, elements, Newton’s laws, energy forms
• Chemistry: Periodic table, acids/bases, organic compounds
• Modern Tech: Ceramics, semiconductors, antibiotics, vaccines

Biological Sciences (20 marks)

• Cell Biology: Organelles (nucleus, mitochondria), DNA replication
• Biomolecules: Proteins, carbs, lipids, enzymes
• Human Physiology: Digestion, respiration, nervous system
• Kingdoms: Plant/animal classification basics

Environmental/Food Science (15 marks)

• Ecosystems: Food chains, pollution types, climate change
• Nutrition: Vitamins, balanced diet, food preservation
• IT Basics: Computer generations, binary system, internet evolution​

Part II: General Ability (40 Marks) – Must-Master

Topic	Weight	Examples
Arithmetic	15	Percentages, ratios, averages, profit/loss
Algebra	10	Equations, sequences, simple/compound interest
Geometry	10	Triangles, circles, mensuration (area/volume)
Reasoning	5	Series, analogies, logical puzzles

6-Week Preparation Plan

textWeek 1-2: Science (2 chapters/day) – Make 1-page summaries
Week 3-4: Math (20 problems/day) – Focus weak areas
Week 5: Past papers 2016-2025 (2/week timed)
Week 6: Full mocks + error log

Essential Resources (High-Yield)

1. Science: “General Science & Ability” – Caravan/Akram Rashdi
2. Math: Dogar GSA book + “Quantitative Aptitude” – RS Aggarwal
3. Past Papers: FPSC website (solve 10 years)
4. MCQs: Nearpeer/Ilmi GSA Objective

High-Score Answer Strategy

Science Questions (15 marks each):

textI. Definition/Concept (3 marks)
II. Diagram (if applicable) (3 marks) 
III. Examples/Applications (5 marks)
IV. Pakistan Context (4 marks) ← KEY DIFFERENTIATOR

Math Problems:

• Show all steps clearly
• Use exact fractions, not decimals
• Box final answer
• Time: 15 mins/problem max

Common Mistakes (Lose 20-30 Marks)

• Science: Rote facts, no diagrams
• Math: Calculation errors, no working shown
• Skip Pakistan examples (climate, agriculture, health)
• Weak MCQs (unpracticed)

Pro Tip: Non-science background? Focus 70% on Part II (easier to master). Science needs diagrams + current examples (Tarbela Dam, COVID vaccines, CPEC energy projects).

Here is the CSS General Science & Ability (GSA) Book

General Science MCQs (12 Questions)

1. Light Year is a unit of:
   • A) Time B) Speed C) Distance D) Light intensity
   Ans: C. Measures astronomical distances (9.46 trillion km).​
2. Blue color of sky due to:
   • A) Reflection B) Refraction C) Rayleigh Scattering D) Absorption
   Ans: C. Shorter blue wavelengths scatter more.​
3. Sonar works on principle of:
   • A) Infra-red B) Ultrasonic waves C) Radio waves D) Microwaves
   Ans: B. Echo-location for depth measurement.​
4. Permanent hardness of water caused by:
   • A) Magnesium bicarbonate B) Calcium sulphate C) Sodium chloride D) Potassium nitrate
   Ans: B. Not removed by boiling.​
5. Bronze alloy consists of:
   • A) Copper + Zinc B) Copper + Tin C) Iron + Carbon D) Copper + Aluminium
   Ans: B. 88% Cu, 12% Sn.​
6. Isotopes have:
   • A) Different protons B) Same protons, different neutrons C) Same electrons D) Different atoms
   Ans: B. E.g., C-12 and C-14.​
7. Adult human brain weighs:
   • A) 1100-1200g B) 1300-1400g C) 1700-1800g D) 1000g
   Ans: B. Average 1.4 kg.​
8. Antibiotic resistance mainly caused by:
   • A) Incomplete antibiotic course B) Overuse of vaccines C) Poor hygiene D) Genetic mutation
   Ans: A. Bacteria survive and multiply.​
9. Beta software means:
   • A) Final release B) Pre-release testing C) Debugged version D) Open source
   Ans: B. User testing phase.​
10. Hexadecimal AF requires how many bits?
    • A) 4 B) 6 C) 8 D) 16
    Ans: C. A=10, F=15 → 10101111 binary.​
11. Equator passes through:
    • A) Brazil B) Indonesia C) Kenya D) Ecuador
    Ans: C. African country.​
12. Mitochondria is cell’s:
    • A) Control center B) Protein factory C) Powerhouse D) Storage unit
    Ans: C. ATP energy production.​

General Ability MCQs (8 Questions)

13. Average of 10, 20, 30 is:
    • A) 15 B) 20 C) 25 D) 60
    Ans: B. Sum/3 = 60/3.​
14. Ratio 4:6 simplifies to:
    • A) 2:2 B) 2:3 C) 4:6 D) 1:2
    Ans: B. Divide by 2.​
15. Profit on Rs.100 item sold at Rs.120:
    • A) 10% B) 20% C) 25% D) 30%
    Ans: B. (20/100)×100.​
16. Khadija is thrice her daughter’s age. Sum=40. Daughter’s age?
    • A) 5 B) 8 C) 10 D) 12
    Ans: C. Daughter=10, Khadija=30.​
17. Speed 110 km/h = ? m/s
    • A) 25 B) 30 C) 55/18 ≈30.55 D) 40
    Ans: C. ×5/18.​
18. Series: 2, 4, 8, 16, ?
    • A) 20 B) 24 C) 32 D) 64
    Ans: C. ×2 pattern.​
19. Odd one out: Chair, Table, Sofa, Book
    • A) Chair B) Table C) Book D) Sofa
    Ans: C. Not furniture.​
20. Number ÷5 ×3 =60. Original number?
    • A) 90 B) 100 C) 80 D) 70
    Ans: B. Work backwards: 60÷3×5.