GSA Practice Set 6 – General Science & Ability (20 Original MCQs Explained)

This is GSA Practice Set 6 — 20 original MCQs for General Science & Ability (CSS Compulsory, 100 marks). 10 Science (Q1–Q10) + 10 Ability (Q11–Q20). Attempt all 20 in 25 minutes without looking at the answers, then check the explained answers. These are original practice questions, not copied from FPSC papers or competitor question banks, and this site is not affiliated with FPSC. Scoring: 18–20 = strong. 15–17 = good. 12–14 = fair, revise the ones you missed. Below 12 = study the weak-section review, then re-attempt in 2 days.

Science (Q1–Q10)

Q1. What is the chemical symbol for iron? A) Ir B) Fe C) In D) Io

Q2. Which is the largest mammal in the world? A) African elephant B) Blue whale C) Giraffe D) Hippopotamus

Q3. Which is the main gas in the air (about 78%)? A) Oxygen B) Carbon dioxide C) Nitrogen D) Hydrogen

Q4. What is the unit of energy? A) Newton B) Watt C) Joule D) Pascal

Q5. Which organ filters blood and produces urine? A) Liver B) Heart C) Lung D) Kidney

Q6. Which gas do humans exhale (breathe out)? A) Oxygen B) Nitrogen C) Carbon dioxide D) Hydrogen

Q7. Which vitamin deficiency causes night blindness? A) Vitamin A B) Vitamin B C) Vitamin C D) Vitamin D

Q8. Which planet is closest to the Sun? A) Venus B) Earth C) Mercury D) Mars

Q9. What is the chemical formula of common salt? A) KCl B) NaCl C) CaCl2 D) NaOH

Q10. Which blood group is called the universal recipient? A) O negative B) O positive C) AB negative D) AB positive

Ability (Q11–Q20)

Q11. If a toy costs Rs 80, what is the cost of 6 toys (same price)? A) Rs 400 B) Rs 420 C) Rs 480 D) Rs 540

Q12. What is 50% of 200? A) 50 B) 75 C) 100 D) 150

Q13. If 6x – 12 = 30, what is x? A) 5 B) 6 C) 7 D) 8

Q14. Next number in the series: 4, 8, 16, 32, ? A) 48 B) 56 C) 64 D) 128

Q15. What is the area of a square with side 7 cm? A) 14 sq cm B) 28 sq cm C) 49 sq cm D) 56 sq cm

Q16. Which of these is an odd number? A) 38 B) 39 C) 40 D) 42

Q17. If a : b = 1 : 3 and b = 15, what is a? A) 3 B) 5 C) 6 D) 9

Q18. Which of these is a composite number? A) 23 B) 25 C) 29 D) 31

Q19. What is the average of 4, 8, and 12? A) 6 B) 8 C) 10 D) 12

Q20. If a train travels 300 km in 5 hours, what is its speed? A) 50 km/h B) 55 km/h C) 60 km/h D) 65 km/h

Answer Key + Explained Answers

Q1 – B) Fe. Iron = Fe (from Latin Ferrum). Ir = iridium, In = indium, Io is not a symbol.

Q2 – B) Blue whale. The blue whale is the largest mammal (and largest animal) in the world (up to ~30 m, ~150 tonnes). African elephant is largest land mammal; giraffe is tallest; hippo is large but smaller.

Q3 – C) Nitrogen. Air is about 78% nitrogen, 21% oxygen, 1% other gases (argon, CO2, etc.). Oxygen is second, not first; CO2 is ~0.04%; hydrogen is trace.

Q4 – C) Joule. Joule (J) is the unit of energy. Newton = force, Watt = power, Pascal = pressure.

Q5 – D) Kidney. Kidneys filter blood and produce urine. Liver filters toxins / produces bile; heart pumps blood; lung oxygenates blood.

Q6 – C) Carbon dioxide. Humans exhale carbon dioxide (CO2) and inhale oxygen. Nitrogen is inhaled and exhaled unchanged; hydrogen is not exhaled.

Q7 – A) Vitamin A. Night blindness = Vitamin A deficiency. Vitamin B = beriberi; C = scurvy; D = rickets.

Q8 – C) Mercury. Mercury is closest to the Sun. Order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Q9 – B) NaCl. Common salt (sodium chloride) = NaCl. KCl = potassium chloride, CaCl2 = calcium chloride, NaOH = sodium hydroxide (caustic soda).

Q10 – D) AB positive. AB positive (AB+) is the universal recipient (can receive from all groups, as it has A, B, and Rh antigens). O negative is universal donor. O positive and AB negative are not universal recipients.

Q11 – C) Rs 480. 6 × 80 = 480.

Q12 – C) 100. 50% of 200 = 0.50 × 200 = 100.

Q13 – C) 7. 6x – 12 = 30 → 6x = 42 → x = 7.

Q14 – C) 64. Each term doubles: 4 × 2 = 8, 8 × 2 = 16, 16 × 2 = 32, 32 × 2 = 64. (128 is two steps ahead.)

Q15 – C) 49 sq cm. Area of square = side × side = 7 × 7 = 49 sq cm. (28 is perimeter: 4 × 7 = 28 cm.)

Q16 – B) 39. Odd numbers are not divisible by 2. 39 is odd. 38, 40, 42 are even.

Q17 – B) 5. a : b = 1 : 3 means a = (1/3) × b = 15 ÷ 3 = 5.

Q18 – B) 25. Composite = has factors besides 1 and itself. 25 = 5 × 5. 23, 29, 31 are prime.

Q19 – B) 8. Average = (4 + 8 + 12) ÷ 3 = 24 ÷ 3 = 8.

Q20 – C) 60 km/h. Speed = distance ÷ time = 300 ÷ 5 = 60 km/h.

Weak-Section Review

Which section did you score lowest in? Write the 3 questions you missed, the correct answers, and one line for each explaining why. Science: revise symbols (Fe iron, NaCl salt), gases (nitrogen 78% of air, CO2 exhaled), units (Joule energy, Newton force), organs (kidney filters), vitamins (A = night blindness), planets (Mercury closest), blood groups (AB+ universal recipient, O– universal donor). Ability: revise percentages, ratios, averages, speed = distance ÷ time, area vs perimeter, doubling series, prime vs composite, odd vs even. Re-attempt this set in 2 days.

These are original practice questions written for csspastpapers.pk. They are not FPSC official questions, and this site is not affiliated with FPSC.

Related reading: GSA past papers, CSS syllabus, GSA Practice Set 1, GSA Practice Set 2, GSA Practice Set 3, GSA Practice Set 4, GSA Practice Set 5, and MPT Practice Set 1.