Current Affairs MCQs – Science & Technology (20 Explained)

This is a Current Affairs MCQs set — 20 original MCQs on Science & Technology: abbreviations, computers, AI, space, biology, and everyday science. Attempt all 20 in 25 minutes without looking at the answers, then check the explained answers and review your weak section. 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 sections you missed. Below 12 = study the weak-section review, then re-attempt in 2 days. Questions: Q1. What does “WWW” stand for? A) World Wide Web B) World Web Wide C) Web World Wide D) Wide World Web Q2. What does “CPU” stand for? A) Central Processing Unit B) Computer Processing Unit C) Central Program Unit D) Computer Program Unit Q3. What does “AI” stand for? A) Artificial Information B) Artificial Intelligence C) Automated Intelligence D) Artificial Internet Q4. What does “DNA” stand for? A) Deoxyribonucleic Acid B) Deoxyribose Nucleic Acid C) Dioxyribonucleic Acid D) Deoxyribonucleic Atom Q5. Which company developed ChatGPT? A) Google B) Microsoft C) OpenAI D) Meta Q6. Which company makes the iPhone? A) Samsung B) Apple C) Huawei D) Nokia Q7. Which is the largest social media platform by number of users? A) Instagram B) Facebook C) X (Twitter) D) TikTok Q8. What does “HTTP” stand for? A) HyperText Transfer Protocol B) HyperText Transmission Protocol C) HighText Transfer Protocol D) HyperText Transfer Program Q9. What does “USB” stand for? A) Universal Serial Bus B) United Serial Bus C) Universal System Bus D) United System Bus Q10. What does “GPS” stand for? A) Global Positioning System B) Global Position System C) General Positioning System D) Global Processing System Q11. Which planet is known as the Red Planet? A) Venus B) Jupiter C) Mars D) Saturn Q12. Which is the fastest land animal? A) Lion B) Horse C) Cheetah D) Deer Q13. What is the chemical formula of common salt? A) KCl B) NaCl C) CaCl2 D) NaOH Q14. Which is the largest organ of the human body? A) Liver B) Heart C) Skin D) Lung Q15. What is the main source of energy for Earth? A) Moon B) Sun C) Stars D) Volcanoes Q16. Which gas makes up most of Earth’s atmosphere? A) Oxygen B) Carbon dioxide C) Nitrogen D) Hydrogen Q17. What is the SI unit of frequency? A) Watt B) Volt C) Hertz D) Ampere Q18. Which metal is liquid at room temperature? A) Iron B) Copper C) Mercury D) Aluminium Q19. What does “5G” stand for in mobile networks? A) Fifth Generation B) Five Gigabyte C) Fifth Gigabyte D) Five Generation Q20. Which scientist developed the theory of relativity? A) Isaac Newton B) Albert Einstein C) Galileo Galilei D) Charles Darwin Answer Key + Explained Answers: Q1 – A) World Wide Web. WWW = World Wide Web (invented by Tim Berners-Lee). The other options scramble the words. Q2 – A) Central Processing Unit. CPU = Central Processing Unit — the brain of the computer. “Computer Processing Unit” is a common mistake. Q3 – B) Artificial Intelligence. AI = Artificial Intelligence — machines that learn and reason. “Artificial Information / Automated Intelligence / Artificial Internet” are not the expansion. Q4 – A) Deoxyribonucleic Acid. DNA = Deoxyribonucleic Acid — the molecule carrying genetic instructions. “Deoxyribose Nucleic Acid” is close but wrong; “Dioxy-” and “Atom” are wrong. Q5 – C) OpenAI. ChatGPT was developed by OpenAI (released November 2022). Google makes Gemini, Microsoft is a partner / investor, Meta makes Llama. Q6 – B) Apple. iPhone is made by Apple (first iPhone 2007). Samsung makes Galaxy, Huawei makes Mate / Pura, Nokia makes Nokia phones. Q7 – B) Facebook. Facebook is the largest social media platform by users (about 3 billion monthly active users, as of recent counts). Instagram, X, and TikTok are smaller. Q8 – A) HyperText Transfer Protocol. HTTP = HyperText Transfer Protocol — the protocol for web pages. “Transmission” is wrong; “HighText” and “Program” are wrong. Q9 – A) Universal Serial Bus. USB = Universal Serial Bus — the standard connector. “United / System” are wrong. Q10 – A) Global Positioning System. GPS = Global Positioning System — satellite navigation. “Position” (singular) and “General / Processing” are wrong. Q11 – C) Mars. Mars is the Red Planet (iron oxide / rust on its surface). Venus is the Morning Star, Jupiter is the largest, Saturn has rings. Q12 – C) Cheetah. Cheetah is the fastest land animal (up to about 100 km/h in short bursts). Lion, horse, and deer are slower. Q13 – B) NaCl. Common salt is sodium chloride, NaCl. KCl is potassium chloride, CaCl2 is calcium chloride, NaOH is caustic soda. Q14 – C) Skin. Skin is the largest organ (about 2 sq m). Liver is the largest internal organ, heart pumps blood, lungs exchange gases. Q15 – B) Sun. The Sun is the main source of energy for Earth (light, heat, photosynthesis, climate). Moon reflects sunlight, stars are distant, volcanoes are local. Q16 – C) Nitrogen. Nitrogen is about 78% of Earth’s atmosphere. Oxygen is about 21%, carbon dioxide about 0.04%, hydrogen is trace. Q17 – C) Hertz. Hertz (Hz) is the SI unit of frequency. Watt = power, Volt = voltage, Ampere = current. Q18 – C) Mercury. Mercury is liquid at room temperature (melting point –39°C). Iron, copper, and aluminium are solids. Q19 – A) Fifth Generation. 5G = Fifth Generation (of mobile networks). “Five Gigabyte / Fifth Gigabyte” confuse G with gigabyte; “Five Generation” is grammatically wrong. Q20 – B) Albert Einstein. Einstein developed the theory of relativity (special 1905, general 1915). Newton developed gravitation / laws of motion, Galileo improved telescopes, Darwin developed evolution. Weak-Section Review: Which questions did you miss? Write the 3 you missed, the correct answers, and one line for each explaining why. Abbreviations: revise WWW, CPU, AI, DNA, HTTP, USB, GPS, 5G. Companies: OpenAI (ChatGPT), Apple (iPhone), Facebook (largest). Science: Mars (Red Planet), cheetah (fastest), NaCl (salt), skin (largest organ), Sun (energy), nitrogen (atmosphere), Hertz (frequency), mercury (liquid metal), Einstein (relativity). 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: Current Affairs past papers, Pakistan Affairs past papers, CSS syllabus, AI model answer, Climate Change model answer, Education Crisis model answer.