Current Affairs MCQs – Science & Technology Set 5 (20 Explained)
At a glance — Pattern: 20 original questions on inventions and inventors, space exploration, computing, communications 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. This Science Technology MCQs Set 5 gives you 20 original questions on inventions and inventors, space exploration, computing, communications and everyday technology. It is deliberately different from Set 4, which tested acronyms, measuring instruments and SI units. 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.
Science Technology MCQs Set 5 — Questions
Q1. Who is generally credited with inventing the telephone? A) Thomas Edison B) Alexander Graham Bell C) Guglielmo Marconi D) Nikola Tesla. Q2. Who developed the theory of general relativity? A) Isaac Newton B) Niels Bohr C) Albert Einstein D) Galileo Galilei. Q3. Which planet is known as the Red Planet? A) Venus B) Jupiter C) Mars D) Saturn. Q4. Which is the largest moon of Saturn? A) Europa B) Titan C) Ganymede D) Callisto. Q5. What does GPS stand for in everyday navigation? A) Global Positioning System B) General Positioning Service C) Global Postal System D) Ground Positioning Satellite. Q6. Which company developed the Android operating system originally, before its acquisition by Google? A) Apple B) Nokia C) Android Inc. D) Microsoft. Q7. Which gas is most abundant in the Earth’s atmosphere? A) Oxygen B) Carbon dioxide C) Argon D) Nitrogen. Q8. Which instrument is used to measure atmospheric pressure? A) Thermometer B) Barometer C) Altimeter D) Speedometer. Q9. Who wrote the first programmable computer algorithm, and is often called the first programmer? A) Charles Babbage B) Ada Lovelace C) Alan Turing D) John von Neumann. Q10. Which metal is liquid at room temperature? A) Iron B) Mercury C) Aluminium D) Copper. Q11. Which organ in the human body produces insulin? A) Liver B) Kidney C) Pancreas D) Spleen. Q12. What is the main function of red blood cells? A) Fighting infection B) Carrying oxygen C) Clotting blood D) Producing hormones. Q13. Which part of a plant carries out photosynthesis? A) Root B) Stem C) Leaf D) Flower. Q14. Which renewable energy source uses the heat from inside the Earth? A) Solar power B) Wind power C) Geothermal power D) Hydropower. Q15. Which spacecraft was the first to land humans on the Moon? A) Vostok 1 B) Apollo 11 C) Gemini 4 D) Soyuz 1. Q16. What is the boiling point of water at standard sea-level pressure? A) 90°C B) 95°C C) 100°C D) 110°C. Q17. Which vitamin is produced in human skin on exposure to sunlight? A) Vitamin A B) Vitamin B12 C) Vitamin C D) Vitamin D. Q18. Which device converts sound into electrical signals in a telephone or microphone? A) Loudspeaker B) Transducer C) Amplifier D) Resistor. Q19. Which of the following is a web browser? A) Windows B) Linux C) Firefox D) Android. Q20. Which planet has the shortest day, rotating fastest on its axis? A) Mercury B) Venus C) Earth D) Jupiter.
Science Technology MCQs Set 5 — Explained Answers
Q1. B) Alexander Graham Bell — Bell patented the telephone in 1876; Edison improved it later, and Marconi is associated with radio. Q2. C) Albert Einstein — general relativity (1915) describes gravity as the curvature of space-time; Newton described gravity as a force. Q3. C) Mars — Mars looks red because of iron oxide, rust, on its surface. Q4. B) Titan — Titan is Saturn’s largest moon; Ganymede is Jupiter’s largest moon and the largest moon in the solar system. Q5. A) Global Positioning System — GPS uses a constellation of satellites to fix a receiver’s position on Earth. Q6. C) Android Inc. — Android Inc. developed Android before Google acquired it in 2005. Q7. D) Nitrogen — nitrogen makes up about 78% of the atmosphere; oxygen is about 21%. Q8. B) Barometer — a barometer measures air pressure; a thermometer measures temperature and an altimeter measures altitude. Q9. B) Ada Lovelace — Lovelace wrote an algorithm for Babbage’s Analytical Engine in the 1840s and is regarded as the first computer programmer. Q10. B) Mercury — mercury is the only metal that is liquid at ordinary room temperature. Q11. C) Pancreas — the pancreas produces insulin, which regulates blood sugar; the liver stores glucose and makes bile. Q12. B) Carrying oxygen — red blood cells carry oxygen from the lungs to the tissues, using haemoglobin. Q13. C) Leaf — leaves contain chlorophyll and are the main site of photosynthesis in most plants. Q14. C) Geothermal power — geothermal energy uses heat from beneath the Earth’s surface; solar uses sunlight, wind uses moving air, and hydropower uses flowing water. Q15. B) Apollo 11 — Apollo 11 landed the first humans on the Moon in July 1969; Vostok 1 carried the first human into space. Q16. C) 100°C — at standard sea-level pressure, water boils at 100°C; the boiling point falls at higher altitude. Q17. D) Vitamin D — sunlight on skin triggers vitamin D production; vitamin C comes mainly from food. Q18. B) Transducer — a transducer converts one form of energy into another; a microphone is a transducer that converts sound into electrical signals. Q19. C) Firefox — Firefox is a web browser; Windows and Linux are operating systems and Android is a mobile operating system. Q20. D) Jupiter — Jupiter rotates once in under 10 hours, the fastest rotation of any planet; Venus rotates slowest.
Weak-section review: If inventions and inventors were weak, revise a short timeline: telephone (Bell, 1876), light bulb improvements (Edison), radio (Marconi), relativity (Einstein, 1905 and 1915), first Moon landing (Apollo 11, 1969). If space questions were weak, revise the planets in order and the largest moons: Titan (Saturn), Ganymede (Jupiter). If computing questions were weak, revise the difference between hardware, software, operating systems and browsers — a frequent source of one-mark errors.