Current Affairs MCQs – Science & General Knowledge Set 3 (20 Explained)

At a glance

• Pattern: 20 original questions on science, the human body, the Earth and everyday technology
• 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, below 12 = study the weak-section review, then re-attempt in 2 days

How to use

Attempt all 20 questions first, under time, without checking the answers. Check the explained answers only after you finish, and note why each wrong option fails. Re-attempt the set in 2 days, focusing on the section you scored lowest in.

Science & General Knowledge MCQs Set 3 — Questions

1. Q1. Which gas do plants absorb from the air for photosynthesis?
   A) Oxygen B) Nitrogen C) Carbon dioxide D) Hydrogen
2. Q2. Which organ in the human body produces insulin?
   A) Liver B) Pancreas C) Kidney D) Spleen
3. Q3. What is the chemical symbol for gold?
   A) Ag B) Au C) Gd D) Go
4. Q4. Which planet is known as the Red Planet?
   A) Venus B) Jupiter C) Mars D) Saturn
5. Q5. How many bones are there in the adult human body?
   A) 106 B) 206 C) 306 D) 226
6. Q6. Which instrument is used to measure atmospheric pressure?
   A) Thermometer B) Barometer C) Altimeter D) Speedometer
7. Q7. Water is made of hydrogen and which other element?
   A) Nitrogen B) Carbon C) Oxygen D) Helium
8. Q8. Which vitamin does sunlight help the human body to produce?
   A) Vitamin A B) Vitamin B C) Vitamin C D) Vitamin D
9. Q9. Which part of the plant carries water from the roots to the leaves?
   A) Flower B) Stem C) Fruit D) Seed
10. Q10. What force keeps planets in orbit around the Sun?
    A) Magnetism B) Friction C) Gravity D) Inertia
11. Q11. Which of the following is a renewable source of energy?
    A) Coal B) Natural gas C) Solar power D) Diesel
12. Q12. Which blood cells carry oxygen around the body?
    A) White blood cells B) Platelets C) Red blood cells D) Plasma cells
13. Q13. At what temperature does water boil at sea level?
    A) 90°C B) 95°C C) 100°C D) 110°C
14. Q14. Which gas makes up most of the Earth’s atmosphere?
    A) Oxygen B) Carbon dioxide C) Nitrogen D) Argon
15. Q15. Which device converts sound into electrical signals in a telephone?
    A) Speaker B) Microphone C) Antenna D) Battery
16. Q16. Which organ filters blood in the human body?
    A) Heart B) Lung C) Kidney D) Stomach
17. Q17. Which of the following animals is a mammal?
    A) Shark B) Penguin C) Dolphin D) Lizard
18. Q18. What is the main function of the roots of a plant?
    A) To make food B) To absorb water and nutrients C) To attract insects D) To produce seeds
19. Q19. Which metal is liquid at room temperature?
    A) Iron B) Mercury C) Copper D) Aluminium
20. Q20. Which layer of the Earth is the outermost?
    A) Core B) Mantle C) Crust D) Asthenosphere

Answer key + explained answers

1. Q1 – C) Carbon dioxide. Plants absorb carbon dioxide and release oxygen during photosynthesis.
2. Q2 – B) Pancreas. The pancreas produces insulin, which regulates blood sugar.
3. Q3 – B) Au. Au comes from the Latin word for gold, aurum; Ag is silver.
4. Q4 – C) Mars. Mars appears red because of iron oxide on its surface.
5. Q5 – B) 206. An adult human typically has 206 bones.
6. Q6 – B) Barometer. A barometer measures atmospheric pressure; a thermometer measures temperature.
7. Q7 – C) Oxygen. A water molecule is two hydrogen atoms and one oxygen atom.
8. Q8 – D) Vitamin D. Sunlight on the skin helps the body produce vitamin D.
9. Q9 – B) Stem. The stem carries water and nutrients between roots and leaves.
10. Q10 – C) Gravity. Gravity holds planets in orbit around the Sun.
11. Q11 – C) Solar power. Solar power is renewable; coal, natural gas and diesel are fossil fuels.
12. Q12 – C) Red blood cells. Red blood cells carry oxygen to the body’s tissues.
13. Q13 – C) 100°C. Water boils at 100°C at sea level.
14. Q14 – C) Nitrogen. Nitrogen makes up most of the Earth’s atmosphere, followed by oxygen.
15. Q15 – B) Microphone. A microphone converts sound into electrical signals.
16. Q16 – C) Kidney. The kidneys filter blood and remove waste.
17. Q17 – C) Dolphin. Dolphins are mammals; sharks are fish, penguins are birds, and lizards are reptiles.
18. Q18 – B) To absorb water and nutrients. Roots anchor the plant and take in water and nutrients from the soil.
19. Q19 – B) Mercury. Mercury is a metal that is liquid at room temperature.
20. Q20 – C) Crust. The crust is the Earth’s outermost layer.

Weak-section review

• Human body: pancreas and insulin, red blood cells and oxygen, kidneys and filtration, adult bone count, vitamin D and sunlight.
• Plants and Earth: photosynthesis and carbon dioxide, stems and roots, the crust as the outer layer, nitrogen as the main atmospheric gas.
• Everyday science: boiling point of water, gravity and orbits, solar power as renewable, microphone and sound, mercury as a liquid metal.

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.