GSA Practice Set 31 – General Science & Ability (20 Original MCQs Explained)

Intro

This is GSA Practice Set 31 — 20 original MCQs in the GSA pattern: General Science (Q1–Q10), Quantitative Ability (Q11–Q15), General Knowledge (Q16–Q20). Attempt all 20 in 25 minutes without looking at the answers, then check the explained answers and review your weak section.

Scoring: 18–20 = strong. 15–17 = good. 12–14 = fair, revise the sections you missed. Below 12 = study the weak-section review, then re-attempt in 2 days.

Section A — General Science (Q1–Q10)

Q1. Which planet is known as the Red Planet?
A) Venus
B) Mars
C) Jupiter
D) Saturn

Q2. What is H2O commonly known as?
A) Salt
B) Water
C) Oxygen
D) Hydrogen

Q3. What is the unit of electric current?
A) Volt
B) Ohm
C) Ampere
D) Watt

Q4. Which organ filters blood in the human body?
A) Liver
B) Kidney
C) Heart
D) Lung

Q5. At what temperature does water boil in Fahrenheit?
A) 100°F
B) 180°F
C) 212°F
D) 32°F

Q6. Which gas do plants absorb for photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen

Q7. Which is the largest mammal in the world?
A) African elephant
B) Blue whale
C) Giraffe
D) Hippopotamus

Q8. Which is the smallest bird in the world?
A) Sparrow
B) Bee hummingbird
C) Finch
D) Robin

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

Q10. Which vitamin is produced in the skin by sunlight?
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D

Section B — Quantitative Ability (Q11–Q15)

Q11. What is 25% of 400?
A) 80
B) 90
C) 100
D) 110

Q12. Next number in the series: 3, 6, 12, 24, ?
A) 36
B) 42
C) 48
D) 54

Q13. If r + 9 = 31, what is r?
A) 20
B) 21
C) 22
D) 23

Q14. What is the square of 12?
A) 124
B) 134
C) 144
D) 154

Q15. What is 17 × 6?
A) 92
B) 98
C) 102
D) 108

Section C — General Knowledge (Q16–Q20)

Q16. Which is the capital of France?
A) London
B) Paris
C) Rome
D) Madrid

Q17. Which is the smallest ocean in the world?
A) Indian
B) Atlantic
C) Pacific
D) Arctic

Q18. What is the freezing point of water in Fahrenheit?
A) 0°F
B) 32°F
C) 100°F
D) 212°F

Q19. Which is the hardest naturally occurring substance?
A) Gold
B) Iron
C) Diamond
D) Quartz

Q20. How many legs does a spider have?
A) 6
B) 8
C) 10
D) 4

Answer Key + Explained Answers

Q1 – B) Mars. Mars is the Red Planet. Venus is Morning Star, Jupiter is largest, Saturn has rings.

Q2 – B) Water. H2O is water. Salt is NaCl, oxygen is O2, hydrogen is H2.

Q3 – C) Ampere. Ampere is the unit of electric current. Volt is voltage, Ohm is resistance, Watt is power.

Q4 – B) Kidney. Kidney filters blood. Liver detoxifies, heart pumps, lung breathes.

Q5 – C) 212°F. Water boils at 212°F. 100°F is 38°C, 180°F is 82°C, 32°F is freezing.

Q6 – C) Carbon dioxide. Plants absorb carbon dioxide for photosynthesis. Oxygen is released, nitrogen is in air, hydrogen is in water.

Q7 – B) Blue whale. Blue whale is the largest mammal. African elephant is largest land mammal, giraffe is tallest, hippopotamus is large — but blue whale is largest.

Q8 – B) Bee hummingbird. Bee hummingbird is the smallest bird. Sparrow is small, finch is small, robin is small — but bee hummingbird is smallest.

Q9 – B) NaCl. NaCl is common salt. KCl is potassium chloride, CaCl2 is calcium chloride, HCl is hydrochloric acid.

Q10 – D) Vitamin D. Vitamin D is produced in skin by sunlight. Vitamin A is for vision, Vitamin B is for energy, Vitamin C is for immunity.

Q11 – C) 100. 25% of 400 = 0.25 × 400 = 100.

Q12 – C) 48. Pattern: ×2: 3 × 2 = 6, 6 × 2 = 12, 12 × 2 = 24, 24 × 2 = 48. (36, 42, 54 are not ×2.)

Q13 – C) 22. r + 9 = 31, so r = 31 – 9 = 22.

Q14 – C) 144. Square of 12 = 12² = 12 × 12 = 144. (124, 134, 154 are wrong.)

Q15 – C) 102. 17 × 6 = 102. (92, 98, 108 are wrong.)

Q16 – B) Paris. Paris is the capital of France. London is UK, Rome is Italy, Madrid is Spain.

Q17 – D) Arctic. Arctic is the smallest ocean. Indian is third, Atlantic is second, Pacific is largest.

Q18 – B) 32°F. Water freezes at 32°F. 0°F is -18°C, 100°F is 38°C, 212°F is boiling.

Q19 – C) Diamond. Diamond is the hardest naturally occurring substance. Gold is soft, iron is hard, quartz is hard — but diamond is hardest.

Q20 – B) 8. A spider has 8 legs. Insects have 6, decapods have 10, quadrupeds have 4.

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.
• General Science: revise Mars (Red Planet), H2O (water), Ampere (current), Kidney (filters blood), 212°F (boiling), Carbon dioxide (photosynthesis), Blue whale (largest mammal), Bee hummingbird (smallest bird), NaCl (salt), Vitamin D (sunlight).
• Quantitative Ability: practise percentages, ×2 series, algebra, squares, multiplication.
• General Knowledge: revise Paris (France), Arctic (smallest ocean), 32°F (freezing), Diamond (hardest), spider (8 legs).
• Re-attempt this set in 2 days.

Related / Read also

• General Science & Ability past papers — GSA past papers by year.
• CSS syllabus — the complete FPSC syllabus for every subject.
• MPT Practice Set 1 — 20 original MCQs with explained answers.

Closing

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