Everyday Science — Chapter 8
Inventions, Discoveries & Instruments — The Inventor Tables and the Instrument-Quantity Map
Why this chapter matters: this is the purest memory block in Everyday Science — the papers do not ask you to reason here, they ask you to match a name to a thing. Our verified banks hold 189 questions matching this topic by question text: inventors (90) — above all the telephone, the light bulb, the radio, the television, the printing press, the aeroplane, dynamite and the steam locomotive — discoveries (66) — above all X-rays, radioactivity, penicillin, blood circulation, the laws of motion and gravitation, oxygen and DNA — and measuring instruments (33) — above all the barometer, thermometer, anemometer, hygrometer, seismograph, ammeter and sphygmomanometer. There is no lecture unit behind this topic (taxonomy sources: capsule + banks), so the chapter is built on the IBES Everyday Science capsule bank and the banks’ own keys, with invention years verified against standard references where the banks ask the inventor only. Learn the tables, then drill the traps in Section 11 — most marks here are lost on look-alike pairs, not on unknown facts.
Exam Trend box: 🔁 most repeated in this chapter — the inventor tables (telephone–Bell, bulb–Edison, radio–Marconi, television–Baird), the discovery tables (X-rays–Roentgen, radioactivity–Becquerel, penicillin–Fleming) and the instrument–quantity map (barometer, anemometer, hygrometer, sphygmomanometer), on the chapter’s 189-question base count. ⭐ must-know — the same three families: they are the core of every paper’s inventions block, and the modern set (WWW, email, mobile phone 1973, transistor 1947, integrated circuit 1959) is still rising in 2025–26 papers. 🆕 newly appeared — the 2025 science & technology year, Section 7A (10 dated rows, origin year 2025, from the gk360 monthly CA bank): CR450 test runs, the Motuo mega-dam start, the Tianshan Shengli Tunnel, the Australia under-16 social media ban, the kangaroo IVF embryos and the Afar ocean-basin study. No 🔁/⭐ mark is claimed for the Section 7A table itself — one year only — and its bank rows are corrected where the bank is wrong (see Section 10).
1. First, the distinction the papers test: invented vs discovered
- Invented = something new was made that did not exist before: the telephone, the light bulb, the printing press, dynamite, the aeroplane. The question word is “invented by”.
- Discovered = something already existing in nature was found and explained: X-rays, radioactivity, oxygen, penicillin (a mould’s natural product), the laws of gravitation. The question word is “discovered by”.
- The papers swap the two verbs deliberately. X-rays were discovered (Roentgen) — they were not “invented”. Radio was invented (Marconi) — it was not “discovered”. If the verb in the question does not match the verb you learned, you are reading the wrong row of the table.
| Invention | Inventor | Year / note |
|---|
| Telephone | Alexander Graham Bell | 1876 (patent year; the capsule asks this year directly) |
| Electric light bulb (practical incandescent) | Thomas Edison | 1879 |
| Phonograph (record player) | Thomas Edison | 1877 |
| Radio / wireless system | Guglielmo Marconi | First wireless signals 1895; transatlantic signal 1901 |
| Television | John Logie Baird | Mechanical television, 1926 — the standard answer (see the Jenkins trap in Section 11) |
| Printing press (movable type) | Johannes Gutenberg | c. 1440 |
| Telegraph | Samuel Morse | 1837 (Morse code) |
| Typewriter (first successful) | Christopher Sholes | Capsule key; Remington marketed it |
| Braille system (reading/writing for the blind) | Louis Braille | |
| Fountain pen (first practical) | Lewis Waterman | 1884 |
| Ball-point pen | László Bíró (Biro brothers) | 1938 |
| Safety pin | Walter Hunt | 1849 |
| Email | Ray Tomlinson | Bank key |
| World Wide Web (WWW) | Tim Berners-Lee | Bank key |
| C-language | Dennis Ritchie | Bank key |
| Mobile phone | Martin Cooper | 1973 (bank key, asked twice) |
| Personal computer (first) | John Blankenbaker | Bank key — distinct from Babbage and Aiken (Section 11) |
| Digital computer | Howard Aiken | Bank key |
| Father of the computer | Charles Babbage | Analytical Engine — the idea, not the built machine |
| Transistor | William Shockley, John Bardeen and Walter Brattain (Bell Labs) | 1947 (bank key) |
| Integrated circuit | Robert Noyce | 1959 (bank key — “made equipment shrink”) |
| Fibre optics (high-speed data transmission) | Charles K. Kao | Bank key (Narinder Singh Kapany is the “father of fibre optics” in some books — the bank key is Kao) |
3. Master inventor table II — transport, power and machines
| Invention | Inventor | Year / note |
|---|
| Aeroplane (first powered, piloted flight) | Orville and Wilbur Wright | 17 December 1903, Kitty Hawk |
| Aeroplane jet engine | Hans von Ohain | Bank key (Frank Whittle developed the parallel British engine) |
| Helicopter | Igor Sikorsky | First practical helicopter — the standard answer (Section 11) |
| Steam engine (improved, reliable) | James Watt | Patent 1769; reliable engine in use from 1775 |
| Steam locomotive | George Stephenson | Bank key (“Father of Railways”) |
| Diesel engine | Rudolf Diesel | 1892 |
| Automobile (first gasoline car) | Karl Benz | Bank key (Henry Ford = mass production, Model T 1908 — not the inventor of the car) |
| Dynamite | Alfred Nobel | The fortune behind the Nobel Prizes (Section 12) |
| Tank | Ernest Swinton | Bank key |
| Balloon (hot-air) | Montgolfier brothers | Bank key |
| Refrigerator | James Harrison | Bank key |
| Electric fan | William Thomas Wheeler | Bank key |
| Electric motor | Nikola Tesla | Bank key (induction motor, 1888) |
| Revolver | Samuel Colt | Bank key |
| Knitting machine | William Lee | Bank key |
| Logarithms | John Napier | Bank key |
| Adding machine / calculator | Blaise Pascal | Bank key (“calculator and adding machine”) |
| Lightning rod (and bifocal spectacles) | Benjamin Franklin | Bank key — “father of” electricity work in the capsule’s phrasing |
| Thermos flask | James Dewar | Bank key (Dewar flask) |
| Stethoscope | René Laennec | Capsule key — not Martin Cooper (the mobile-phone man; a capsule distractor) |
| Mercury thermometer | Gabriel Fahrenheit | Bank key (doctor’s thermometer also keyed Fahrenheit) |
| Barometer | Evangelista Torricelli | Bank key, asked repeatedly |
| Soda water | Joseph Priestley | Capsule key |
| Synthetic dyes | William Perkin | Bank key (Perkins in the paper’s spelling) |
| Steel from iron (manufacturing method) | Henry Bessemer | Bank key (Bessemer process) |
| Shorthand (Pitman) | Isaac Pitman | Bank key |
| Video tape | Charles Ginsburg | Bank key |
| Polaroid (instant) camera | Edwin Land | Bank key |
| Needle-hole (pinhole) camera | Ibn al-Haytham | Bank key (“Bu Ali Sina / Ibn-i-Hisham” are distractors; the pinhole camera is Ibn al-Haytham’s) |
| Pendulum clock | Christiaan Huygens | 1656 (bank key) |
| Slide rule (engineers’ standard tool before the hand-held calculator) | William Oughtred | Bank key phrasing — the pre-calculator tool |
4. Master discovery table I — physics and chemistry
| Discovery | Discoverer | Year / note |
|---|
| X-rays | Wilhelm Roentgen | 1895 |
| Radioactivity (phenomenon) | Henri Becquerel | 1896 |
| Radium and polonium | Marie Curie | 1898 |
| Gamma rays | Paul Villard | Bank key — distinct from Becquerel (radioactivity itself) |
| Cosmic rays | Victor Hess | Bank key |
| Electron (first identified) | J. J. Thomson | 1897 |
| Proton | Ernest Rutherford | Capsule/bank key (Rutherford named the proton) |
| Neutron | James Chadwick | 1932 |
| Laws of gravitation and three laws of motion | Isaac Newton | 1687 (Principia) |
| First experiments with gravity (before Newton’s laws) | Galileo | Bank key — Galileo experimented, Newton formulated the law |
| Radio waves (first demonstrated / detected from space) | Marconi demonstrated; Karl Jansky first detected cosmic radio waves | Bank keys — two different questions, do not merge them |
| Radioactivity measured by | Geiger–Muller counter | See Section 8 |
| Oxygen | Joseph Priestley | 1774 |
| Nitrogen gas | Daniel Rutherford | Bank key |
| Water’s composition (told by) | Henry Cavendish | Capsule key |
| Iodine | Bernard Courtois | Capsule key |
| Superconductor | Heike Kamerlingh Onnes | Capsule key (spelled “Kimberling” in the OCR) |
| Cell (first observed and named) | Robert Hooke | 1665 (bank key) |
| Microscopic organisms | Antonie van Leeuwenhoek | Bank key |
| First molecule discovered in space | Hydroxyl (OH) | Bank key (EDS-07’s note: hydroxyl = first space molecule) |
| First metal discovered by man | Copper | Bank key |
| Zero (as a number) | Indian mathematicians (Brahmagupta) | Bank key |
5. Master discovery table II — life sciences and medicine
| Discovery | Discoverer | Year / note |
|---|
| Blood circulation | William Harvey | 1628 |
| Laws of heredity | Gregor Mendel | 1866 |
| Penicillin (antibiotic) | Alexander Fleming | 1928 — “brought great revolution in medical history” (capsule) |
| Smallpox vaccine (first vaccine) | Edward Jenner | 1796 (capsule) — vaccination founded by Jenner (capsule key) |
| Malarial parasite in blood cells | Alphonse Laveran | 1880 |
| Cause of malaria (mosquito transmission) | Ronald Ross | Capsule key |
| Insulin | Frederick Banting | 1921 (capsule asks the year) |
| DNA (structure) | Watson and Crick | 1953 (bank key) |
| Sulphuric and nitric acids (early preparation) | Jabir ibn Hayyan | Bank key |
| Oxygen’s discoverer also invented soda water | Joseph Priestley | The same man in both tables — a favourite cross-link |
6. The instrument–quantity map (the section that wins marks)
The papers ask this one way, over and over: “X is used to measure …?” Learn the pairs, not the instruments’ construction.
Weather and atmosphere
| Instrument | Measures |
|---|
| Barometer | Atmospheric (air) pressure — Torricelli’s invention |
| Anemometer | Speed of wind / air |
| Hygrometer | Relative humidity of the atmosphere (water vapour in air) |
| Rain gauge | Amount of rainfall over a set period |
| Altimeter | Altitude above sea level |
| Manometer | Pressure of a gas |
| Pyrometer | Very high temperatures (furnaces, molten metal) |
| Pyrheliometer | Solar radiation |
Electricity and magnetism
| Instrument | Measures |
|---|
| Ammeter | Electric current |
| Voltmeter | Voltage (potential difference) |
| Galvanometer | Small electric currents |
| Ohmmeter | Electrical resistance |
| Electroscope | Detecting electric charge (bank key) |
| Geiger–Muller counter | Radioactivity |
| Dosimeter | Radiation dose (for safety) |
| Cyclotron | Accelerates beams of charged particles (capsule key — it is an accelerator, not a meter) |
Medicine and the body
| Instrument | Measures / used for |
|---|
| Thermometer (mercury) | Temperature; the clinical thermometer measures body temperature |
| Sphygmomanometer | Blood pressure |
| Stethoscope | Heartbeat / body sounds — Laennec’s invention |
| Electrocardiograph (ECG) | Electrical activity of the heart |
| Crescograph | Growth of plants (bank key) |
Everyday, laboratory and precision
| Instrument | Measures / used for |
|---|
| Seismograph | Earthquake waves (recorded on the Richter scale) |
| Speedometer | Speed of a vehicle |
| Odometer | Distance travelled by a vehicle |
| Chronometer | Precise time — used at sea for measuring longitude (bank key) |
| Periscope | Seeing above the surface from a submarine under water (bank key) |
| Photometer | Comparing intensities of two light sources (bank key) |
| Spectrometer | Precise measurement of refractive indices (bank key) |
| Lactometer | Purity of milk (bank key) |
| Hydrometer | Relative density (specific gravity) of a liquid |
| Vernier calipers | Small lengths — least count 0.1 mm (capsule key) |
| Screw gauge | Very small lengths — least count 0.01 mm (capsule key) |
| Gramophone | Recording and reproduction of sound (bank key) |
Why mercury is used in thermometers (bank key, asked repeatedly)
- Mercury is the only metal liquid at ordinary room temperature, it expands uniformly with temperature, and it does not stick to glass. Any one of those three is the keyed answer depending on the options; “all of the above” is keyed when all three appear.
7. Master timeline — inventions in order
| Year | Invention | Inventor |
|---|
| c. 1440 | Printing press | Gutenberg |
| 1643 | Barometer | Torricelli |
| 1656 | Pendulum clock | Huygens |
| 1665 | Cell observed and named | Hooke (a discovery, not an invention — placed here for chronology) |
| 1769 | Improved steam engine (patent) | Watt |
| 1774 | Oxygen isolated | Priestley |
| 1775 | Steam engine in reliable commercial use | Watt |
| 1796 | Smallpox vaccine | Jenner |
| 1830s | Telegraph | Morse |
| 1849 | Safety pin | Hunt |
| 1876 | Telephone | Bell |
| 1877 | Phonograph | Edison |
| 1879 | Practical light bulb | Edison |
| 1884 | Practical fountain pen | Waterman |
| 1892 | Diesel engine | Diesel |
| 1895 | X-rays; wireless signals | Roentgen; Marconi |
| 1896 | Radioactivity | Becquerel |
| 1903 | Powered aeroplane | Wright brothers |
| 1926 | Mechanical television | Baird |
| 1928 | Penicillin | Fleming |
| 1938 | Ball-point pen | Bíró |
| 1947 | Transistor | Shockley, Bardeen, Brattain |
| 1953 | DNA structure | Watson and Crick |
| 1959 | Integrated circuit | Noyce |
| 1973 | Mobile phone | Cooper |
7A. Retrospective — the 2025 science & technology year (origin year 2025)
This table is the 2025 retrospective slice for this chapter: the year’s inventions, discoveries and engineering firsts that the gk360 monthly CA bank actually asks, each verified against a standard source. It is not a list of everything that happened in science in 2025 — the year’s space items live in Chapter 1 Section 6A, its AI items in Computer Science Chapter 7 Section 7A and its health items in Chapter 4 Section 7A, and none of those rows is repeated here. Read this table the way examiners ask it: name → thing → year/figure.
| Date (2025) | Item | The exam fact |
|---|
| February | First kangaroo embryos by IVF — Australia | A University of Queensland-led team produced the first kangaroo embryos through in vitro fertilisation, using intracytoplasmic sperm injection (ICSI — a single sperm injected into a mature egg) on eastern grey kangaroo material; more than 20 embryos were created, as a conservation step toward IVF for scarcer marsupials (koalas, wombats, Tasmanian devils), with a live marsupial IVF birth still reckoned a decade away. Bank row: February 2025 file, “first ever Kangaroo embryos using IVF” → Australia. |
| 2025 (UN year) | International Year of Quantum Science and Technology | The United Nations proclaimed 2025 the International Year of Quantum Science and Technology, marking 100 years since the initial development of quantum mechanics (1925); the General Assembly resolution was introduced by Ghana and adopted 7 June 2024. The hardware name papers pair with it is Google’s Willow quantum processor (105 qubits) — but date it correctly: Willow was announced in December 2024 (a benchmark run in 5 minutes that Google presented as taking a classical supercomputer 10 septillion years), so it is the quantum year’s backdrop, not a 2025 launch. Bank rows: April 2025 “year declared … quantum science and technology” → 2025; January 2025 “quantum processor ‘Willow’” → Google. |
| July | India’s hydrogen train — first coach tested | Indian Railways successfully tested its first hydrogen-powered coach (the Driving Power Car) at the Integral Coach Factory, Chennai, in July 2025, under the Hydrogen for Heritage initiative (35 hydrogen trains planned for heritage and hill routes; Jind–Sonipat pilot route). The 2025 reporting figure papers use is a 1,200-horsepower engine, presented as the world’s most powerful hydrogen train engine (other countries’ hydrogen trains then ran 500–600 HP); each train was costed at about Rs 80 crore. Bank row: January 2025 “world’s most powerful hydrogen train engine” → India. |
| 3 July | Peñico, Peru — 3,500-year-old city unveiled | Archaeologists unveiled Peñico in Peru on 3 July 2025: a city founded between 1800 and 1500 BC, about 200 km north of Lima, with 18 structures uncovered after eight years of excavation (from 2017) under archaeologist Ruth Shady — ceremonial temples and residential complexes, including pututu (conch-shell trumpet) finds. Its importance is as the continuation of the Caral society (the oldest known civilisation in the Americas) and a trading hub linking Pacific-coast, Andean and Amazon communities. Bank row: July 2025 “ancient city in Peru dating back how many years” → 3,500 years old. |
| June (study) | Afar, Ethiopia — a future ocean basin | A June 2025 study in Nature Geoscience (Watts et al.; 130+ volcanic rock samples from the Afar region) showed the mantle plume beneath Afar rising in rhythmic pulses — a “geological heartbeat” — rather than as a steady flow, at the triple junction where the Main Ethiopian, Red Sea and Gulf of Aden rifts meet. The prediction papers ask is that Afar could eventually become Earth’s next ocean basin — over millions of years, as the Somali plate pulls away from the Nubian plate and seawater eventually floods in; it is a prediction, not an event. Bank row: December 2025 “which region of Africa could eventually become Earth’s next ocean basin” → Afar. |
| 19 July | Motuo / Yarlung Tsangpo mega-dam — construction begins | China began construction on 19 July 2025 of the world’s largest hydropower project on the Yarlung Tsangpo (the upper Brahmaputra) at the Great Bend in Medog (Motuo), Tibet: five cascade stations, about 60,000 MW installed capacity — roughly three times the Three Gorges Dam — designed for about 300 billion kWh a year, with commercial operation planned around 2033 and a reported cost around 1.2 trillion yuan (~US$168 billion). Bank row: July 2025 “world’s largest hydroelectric dam project … projected capacity” → China; 300 billion kWh. |
| 4 September | Norway’s electric plane — Stavanger to Bergen in 55 minutes | An all-electric BETA ALIA CX300 flew Stavanger → Bergen (160 km) in 55 minutes on 4 September 2025, a simulated cargo flight run by Bristow for Norway’s airport operator Avinor — the first time an electric plane flew that trade route, on battery power alone, with a range of about 400 km per charge and commercial electric flights expected around 2028–2030. Bank row: September 2025 “electric plane that completed a 55-minute flight” → Norway. |
| 2025 (test runs) | CR450 — China’s 450 km/h train | China’s CR450 bullet train reached 450–453 km/h in 2025 test runs (a single train at 453 km/h; two passing trains at a combined 896 km/h), against a designed commercial speed of 400 km/h — above the current CR400 Fuxing’s 350 km/h. Date it correctly: the two prototypes (CR450AF and CR450BF) were unveiled in December 2024; 2025 is the year of the record test runs, not the unveiling. Bank rows: April and March 2025 “fastest high speed train prototype unveiled by China” → CR450 (the January 2025 row keys the same question to Russia — a bank error, corrected here: the CR450 is Chinese, built by CRRC). |
| 10 December | Australia — first under-16 social media ban in force | Australia became the first country to ban social media for children under 16 when its minimum-age law took effect on 10 December 2025: ten major platforms (including TikTok, YouTube, Instagram, Facebook, Snapchat, X, Reddit, Twitch, Kick, Threads) must take reasonable steps to stop under-16s holding accounts, with fines up to A$49.5 million; the obligation sits on the platforms, not on children or parents. Note the two-step dating: the law was passed in 2024 and took effect 10 December 2025 — a question asking when the ban started answers December 2025. Bank rows: November 2025 “passed legislation to ban social media usage for children under 16” and December 2025 “first to ban social media for teenagers under 16” → Australia. |
| 26 December | Tianshan Shengli Tunnel — world’s longest expressway tunnel opens | China opened the Tianshan Shengli Tunnel (22.13 km) in Xinjiang on 26 December 2025: the world’s longest expressway tunnel, the centrepiece of the 324.7 km G0711 Urumqi–Yuli Expressway, cutting the Urumqi–Korla journey from about seven hours to about three (the mountain crossing itself to about 20 minutes), with a maximum burial depth of 1,112 metres and the deepest vertical shaft of any highway tunnel. Do not merge it with the longest tunnel overall: Switzerland’s Gotthard Base Tunnel (57 km) is a railway tunnel and far longer. Bank row: December 2025 “world’s longest expressway tunnel, the Tianshan Shengli Tunnel” → China. |
7B. PMS Screening 2026 General Science mock — the rows this chapter was missing
Source: the Sir Adnan PMS Screening 2026 GK General Science subject mock (100 items, printed options + answer key; a new compilation, not a duplicate of any bank paper — conversion gate passed). Every item was chapter-checked against this chapter and the other EDS chapters: the great majority was already taught (units ampere/watt/ohm/kelvin/pascal/joule/coulomb/farad/henry/volt/tesla/becquerel/mole/decibel in Chapter 6 Section 2; inventors Bell/Edison/Marconi/Baird/Wright/Colt/Bíró and discoveries Thomson/Rutherford/Chadwick/Fleming/Jenner/Mendel/Watson–Crick/Darwin/Harvey/Banting/Priestley/Nobel/Mendeleev in Sections 2–5; instruments barometer/anemometer/hygrometer/seismograph/ammeter/hydrometer/sphygmomanometer/rain gauge/altimeter/speedometer in Section 6). The rows below are the genuinely missing ones, each verified against the mock’s keyed answer and the standard fact. No mark is claimed on any of them: the bank-evidence script (hidden_files/goldmine-notes-count-gensci-mock.py, 608 files / 58,098 questions) finds every new family at 0–8 loose rows, below both 🔁 limbs — the mock is practice material, not exam-paper frequency evidence. Already covered in substance elsewhere, so not repeated here: Copernicus (heliocentric theory — Geography Chapter 1), Borlaug (Green Revolution wheat programme — Pakistan Studies Chapter 11), Wegener (continental drift — Geography Chapter 2). The mock’s five SI units that Chapter 6’s table lacked (electron volt, lumen, radian, siemens, weber) are filed in Chapter 6 Section 2, not here.
| Scientist / discovery | The exam fact |
|---|
| Albert Einstein — father of modern physics; theory of relativity | Einstein proposed special relativity in 1905 and general relativity in 1915; Chapter 1 mentions him only for the black-hole concept, so the “father of modern physics” label and the two relativity dates are filed here. |
| Johannes Kepler — laws of planetary motion | Kepler’s three laws of planetary motion (1609–1619); Chapter 1 names Kepler only in a Pluto aside, not the laws. |
| Werner Heisenberg — uncertainty principle, 1927 | Heisenberg gave the uncertainty principle in 1927 (position and momentum cannot both be known exactly). |
| Zacharias Janssen — first compound microscope, c. 1590 | Janssen is credited with the first compound microscope (c. 1590). Trap: Leeuwenhoek is the father of microscopy (Section 4 already teaches him for microscopic organisms) — Janssen built the instrument, Leeuwenhoek made it a science. |
| Antoine Lavoisier — law of conservation of mass; Father of Modern Chemistry | Lavoisier gave the law of conservation of mass: mass is neither created nor destroyed in a chemical reaction. Papers also call him the Father of Modern Chemistry (PMS Screening 2026 GK High Yield Mock 14, Q27; mocks + practice sets only, no exam-paper row, no mark claimed). |
| Joshua Lederberg — plasmid, 1952 | Lederberg coined the term plasmid in 1952 for extra-chromosomal DNA. Teach it as “coined”, not “discovered”: the mock’s wording (“discovered plasmid”) is loose — plasmids as such were observed before the name. |
| Georges Lemaître — Big Bang (primeval atom), 1927 | Lemaître proposed the Big Bang theory in 1927 as the primeval-atom hypothesis. |
| Theodore Maiman — first working laser, 1960 | Maiman built the first working laser in 1960 (ruby laser). Trap: Townes is the maser/theory man — the mock’s own note flags this; laser = Maiman, maser = Townes. |
| Thomas Newcomen — first successful steam engine, 1712 | Newcomen’s 1712 atmospheric engine was the first successful practical steam engine; Watt improved it (the rapid-fire “Steam engine: Watt” line is the improved engine, not the first). |
| Max Planck — quantum theory, 1900 | Planck proposed quantum theory in 1900 (energy in discrete quanta). |
| Carl Woese — three-domain system | Woese proposed the three-domain system of life: Bacteria, Archaea, Eukarya. |
| Johan Edvard Lundström — safety match, 1855 | Lundström developed the safety match in 1855. |
| C. V. Raman — Raman effect, 1928 | Raman discovered the Raman effect in 1928 (scattering of light). |
| Willebrord Snell — laws of refraction | Snell gave the laws of refraction (Snell’s law). |
| William Herschel — infrared radiation, 1800 | Herschel discovered infrared radiation in 1800. |
| Otto Hahn — nuclear fission, 1938 | Hahn (with Fritz Strassmann) discovered nuclear fission in 1938. |
| Albert Szent-Györgyi — vitamin C | Szent-Györgyi isolated vitamin C (ascorbic acid) in the early 1930s; Chapter 5 teaches the vitamin, not its isolator. |
| Instrument | Measures |
|---|
| Calorimeter | Heat (heat absorbed or released in a reaction). |
| Lux meter | Light intensity as illuminance, in lux (the mock’s flagged note: a lux meter is the illuminance-reading photometer). |
| pH meter | pH (acidity/alkalinity). |
| Sextant | Angles — classically the angle between the horizon and a celestial body (navigation). |
| Viscometer | Viscosity (a fluid’s resistance to flow). |
| Wattmeter | Electric power. |
| Sound level meter | Sound level / sound intensity, in decibels (pairs with Chapter 6 Section 2’s decibel row). |
Rapid-fire additions from this section: Relativity: Einstein, 1905/1915. Uncertainty: Heisenberg, 1927. Quantum: Planck, 1900. Big Bang: Lemaître, 1927. Laser: Maiman, 1960. Fission: Hahn, 1938. Raman effect: Raman, 1928. Microscope: Janssen, c. 1590. Steam engine first: Newcomen, 1712 (Watt improved it). Safety match: Lundström, 1855. Three domains: Woese. Plasmid term: Lederberg, 1952. Calorimeter = heat; lux meter = illuminance; pH meter = pH; sextant = angles; viscometer = viscosity; wattmeter = electric power; sound level meter = sound level.
8. Rapid-fire one-liners
- Telephone: Bell, 1876. Light bulb: Edison, 1879. Phonograph: Edison, 1877.
- Radio: Marconi. Television: Baird. Printing press: Gutenberg, c. 1440.
- Aeroplane: Wright brothers, 1903. Jet engine: Hans von Ohain. Helicopter: Sikorsky.
- Steam engine: Watt. Steam locomotive: Stephenson. Diesel engine: Diesel, 1892.
- Dynamite: Alfred Nobel. Tank: Swinton. Revolver: Colt. Safety pin: Hunt, 1849.
- Ball-point pen: Bíró, 1938. Fountain pen: Waterman, 1884. Braille: Louis Braille.
- WWW: Tim Berners-Lee. Email: Ray Tomlinson. C-language: Dennis Ritchie.
- Mobile phone: Martin Cooper, 1973. Transistor: Shockley, Bardeen, Brattain, 1947. Integrated circuit: Noyce, 1959.
- Computer’s father: Babbage. Digital computer: Aiken. First personal computer: Blankenbaker.
- Barometer: Torricelli — measures atmospheric pressure. Thermometer: Fahrenheit — measures temperature.
- X-rays: Roentgen, 1895. Radioactivity: Becquerel, 1896. Radium/polonium: Marie Curie, 1898.
- Gamma rays: Villard. Cosmic rays: Hess. Electron: J. J. Thomson, 1897. Neutron: Chadwick, 1932.
- Proton: Rutherford. Gravity + laws of motion: Newton. Blood circulation: Harvey, 1628.
- Oxygen: Priestley, 1774. Nitrogen: Daniel Rutherford. Penicillin: Fleming, 1928.
- Smallpox vaccine: Jenner, 1796. DNA: Watson and Crick, 1953. Heredity laws: Mendel.
- Insulin: Banting, 1921. Malaria parasite: Laveran. Malaria transmission: Ross.
- Anemometer: wind speed. Hygrometer: relative humidity. Hydrometer: relative density of a liquid.
- Lactometer: milk purity. Altimeter: altitude. Rain gauge: rainfall.
- Seismograph: earthquake waves. Sphygmomanometer: blood pressure. Stethoscope: Laennec.
- Ammeter: current. Voltmeter: voltage. Galvanometer: small current. Ohmmeter: resistance.
- Electroscope: electric charge. Photometer: comparing light intensities. Spectrometer: refractive indices.
- Speedometer: speed. Odometer: distance. Chronometer: longitude (precise time at sea).
- Periscope: submarine viewing. Crescograph: plant growth. Gramophone: recording and reproduction of sound.
- Vernier calipers least count: 0.1 mm. Screw gauge least count: 0.01 mm.
- Mercury in thermometers: only metal liquid at room temperature, expands uniformly.
- 2025 science year (Section 7A): CR450 — China, 450 km/h tests · Motuo dam — construction 19 July 2025, ~60 GW, ~300 billion kWh/yr · Tianshan Shengli Tunnel — 22.13 km, opened 26 December 2025 · Australia — under-16 social media ban in force 10 December 2025 · kangaroo IVF — Australia, February 2025 · Peñico — Peru, 3 July 2025, 1800–1500 BC, 18 structures · Afar — future ocean basin (prediction, millions of years) · Norway electric plane — Stavanger–Bergen, 160 km, 55 minutes · Quantum Year 2025; Willow — Google, December 2024 · India hydrogen train — ICF Chennai, July 2025, 1,200 HP.
9. Most-asked facts (from our verified past-paper banks)
- The telephone–Bell, bulb–Edison, radio–Marconi, television–Baird set is asked in nearly every cycle — sometimes as four separate questions in one paper.
- Barometer = Torricelli and barometer = atmospheric pressure are two separate questions from the same fact; both are asked.
- X-rays = Roentgen and radioactivity = Becquerel are the discovery pair the papers never stop repeating; gamma rays = Villard is the third member that separates the toppers.
- Penicillin = Fleming, 1928 and smallpox vaccine = Jenner, 1796 are the medicine pair; the capsule asks both years.
- Blood circulation = Harvey and laws of motion/gravitation = Newton are the “who discovered” staples.
- On instruments, the wind/humidity pair (anemometer = wind speed, hygrometer = relative humidity) and the blood-pressure instrument (sphygmomanometer) are the most repeated single questions.
- The modern set — WWW = Berners-Lee, email = Tomlinson, mobile phone = Cooper 1973, transistor 1947, integrated circuit 1959 — is rising in recent papers (2025–26) and is where older capsule-only preparation goes stale.
- The 2025 science year (Section 7A) is the chapter’s retrospective companion set: ten dated rows from the gk360 monthly CA bank (CR450, Motuo, Tianshan Shengli, Australia’s under-16 ban, kangaroo IVF, Peñico, Afar, Norway’s electric plane, Quantum Year 2025, India’s hydrogen train). It is filed as a 2025 table only — no 🔁/⭐ mark is claimed for it — and the bank rows behind it are corrected in Section 10 where the bank is wrong.
10. Traps & confusions
- Hydrometer vs hygrometer: hydrometer measures a liquid’s relative density (think water, hydro); hygrometer measures air humidity (think moisture). One letter apart, opposite jobs — the papers set them as options against each other.
- Television: Baird vs Jenkins: one bank paper keys Charles Francis Jenkins for “who invented the television”. The standard answer, used by the capsule and the rest of the banks, is John Logie Baird. If both appear as options, pick Baird.
- Helicopter: Sikorsky vs Breguet: one bank paper keys Breguet (whose 1907 Gyroplane was the first to lift off, briefly and uncontrollably). The standard answer is Igor Sikorsky, builder of the first practical helicopter. Pick Sikorsky unless the question says “first to lift”.
- Computer: three different answers for three different questions: father of the computer = Babbage (the idea); digital computer invented by = Aiken; first personal computer = Blankenbaker. The question’s exact wording decides.
- Radio: Marconi vs Tesla: Marconi built the first practical wireless system (the bank key). Tesla’s radio work is real but is not the papers’ answer.
- X-rays vs radioactivity: Roentgen discovered X-rays; Becquerel discovered radioactivity. The two are set against each other as options in both directions.
- Smallpox vaccine vs vaccination’s founder vs polio vaccine: Jenner = smallpox vaccine and founder of vaccination. Salk/Sabin = polio (Chapter 4) — never the smallpox answer.
- Stethoscope vs mobile phone: the capsule lists Martin Cooper among the stethoscope options — Cooper is the mobile-phone man (1973). The stethoscope is Laennec’s.
- Fibre optics: Kao vs Kapany: the bank key is Charles K. Kao. Kapany is called the father of fibre optics in some books, but the papers key Kao.
- Automobile: Benz vs Ford: Benz invented the gasoline car; Ford invented mass production (Model T, 1908). “Who invented the automobile” = Benz (bank key: Daimler in one paper’s options is the same early-car family — Benz/Daimler is the German pair; Ford is the trap).
- Thermometer inventor vs thermometer scale: Fahrenheit invented the mercury thermometer; Celsius is a scale, not the inventor. A “doctor’s thermometer” question keys Fahrenheit in the banks.
- “Discovered” questions that are not science: exploration questions (America, Australia, sea route to India), resource questions (Sui gas, coal reserves) and English-vocabulary questions using “discover” are not this chapter’s questions — they were removed from the 189 count. In the exam hall, read whether the question is about a scientist before reaching for this chapter’s tables.
- Section 7A bank corrections, not taught as banked: the January 2025 CR450 row keys the prototype to Russia — wrong; the CR450 is Chinese (CRRC), and the April/March 2025 rows key it correctly to China. The CR450 was unveiled in December 2024; 2025 supplies the 450–453 km/h test runs, so “unveiled in 2025” is the wrong date for the prototype. Google’s Willow was announced in December 2024, not in 2025 — it belongs to the Quantum Year as context, not as a 2025 launch. Australia’s under-16 ban was passed in 2024 and took effect 10 December 2025 — “banned in 2024” and “banned in 2025” are both half-right and examiners can use either limb, so learn both dates. The Tianshan Shengli Tunnel is the longest expressway tunnel (22.13 km) — the longest tunnel overall remains a railway tunnel (Gotthard Base, 57 km), and the two records must not be swapped. The Afar ocean is a prediction over millions of years, not an event that happened in 2025. Held, not taught: the January 2025 compressed-air-storage row (China’s Feicheng 300 MW plant came online in 2024, so it is not a 2025 item); the December 2025 “Ahmad Abbas / light activation therapy” row (no corroborating source found for that name and claim — not taught); and the August 2025 “third shortest day” row (single bank row, detail unverified).
11. Memory tricks (clean professional hooks — no lecture unit exists for this topic, so these are built from the names themselves)
- Bell rings: the telephone rings — Bell invented it. The sound of the invention is the name of the inventor.
- Edison lights: Edison = edited light into being — the bulb man. Pair with 1879: Edison’s bulb year ends in 79, and the phonograph (1877) came two years earlier — 77 then 79, sound then light.
- Baird broadcasts: Baird = Broadcast — television. Marconi = Morse without wires — Marconi’s radio.
- Gutenberg’s press: Gutenberg = Ground-breaking print — the press that printed books. 1440: the press is four centuries before the telephone (1876) — four hundred years of print before voice.
- Wright flies right: the Wright brothers got flight right in 1903 — 19-03, the century’s third year, the century of flight.
- Nobel’s explosive fortune: Nobel invented dynamite, and the dynamite fortune funds the Nobel Prizes — the prize is paid for by the explosive. Remember the prize, remember the inventor.
- Torricelli’s pressure: Torricelli = Top of the air — the barometer weighs the air pressing down. BARO = weight: barometer = air-weight meter.
- ANEMO = wind, HYGRO = wet: anemometer carries the Greek wind (anemos); hygrometer carries the Greek wet (hygros). HYDRO = water-density for the hydrometer — wet air vs water liquid, the trap pair decoded by its first syllable.
- SPHYGMO = pulse: sphygmomanometer is long because blood-pressure measurement is long — shorten it to sphygmo = pulse, and the instrument is the pulse-pressure meter.
- SEISMO = shake: seismograph = shake-writer (graph = writes). ALTI = high: altimeter = height meter. CHRONO = time: chronometer = precision time, the sailor’s longitude tool.
- Fleming’s mould, Jenner’s milkmaid: penicillin came from a mould (1928); Jenner’s vaccine came from cowpox (1796) — mould and cow, the two farmyard origins of modern medicine.
- Harvey’s heart circuit: Harvey = hart (heart) in disguise — blood circulates because the heart pumps it round the circuit. 1628: Harvey published before the telephone by 248 years — circulation is old knowledge, telephones are new.
- The 1947–1959 electronics jump: transistor 1947, integrated circuit 1959 — twelve years from one switch to a whole circuit on a chip. 47 then 59: the numbers rise as the devices shrink.
- 2025 science ladder (Section 7A, in date order): Kangaroo IVF (February, Australia) → Quantum Year (2025, Willow December 2024) → Hydrogen train (July, Chennai) + Peñico (3 July, Peru) + Motuo dam (19 July, Tibet) → Norway electric plane (4 September, 55 minutes) → CR450 tests (450 km/h) → Australia ban (10 December) + Tianshan Tunnel (26 December). Ten rungs, February to December — recite the months and the table answers itself.
12. Visuals (site build specs)
- INFOGRAPHIC — The inventor timeline: horizontal band from Gutenberg (c. 1440) through Watt (1769), Bell (1876), Edison (1879), Wright (1903), Fleming (1928), transistor (1947) to mobile phone (1973), colour-coded communication / transport / medicine — placed before Section 7 as the chapter’s orientation graphic.
- TABLE-GRID — The instrument–quantity map: the Section 6 tables rendered as a single match-the-pair grid (instrument on the left, quantity on the right, with the hydrometer/hygrometer and barometer/manometer pairs visually separated) — placed in Section 6 as the revision graphic students screenshot.
- DIAGRAM — Barometer vs thermometer vs anemometer: three weather instruments side by side with what each measures labelled on the instrument itself (pressure / temperature / wind speed) — placed in Section 6, weather block.
- INFOGRAPHIC — Invented vs discovered: two columns (made vs found) with the Section 1 examples sorted under each verb — placed in Section 1.
- TIMELINE — The 2025 science year: the Section 7A table rendered as a single-year timeline strip (February kangaroo IVF → December Tianshan Tunnel), one node per row with the figure that papers ask (450 km/h, 60 GW, 22.13 km, 10 December, 55 minutes) — placed at the end of Section 7A.
13. Practice this topic
- Practice set: 189 verified past-paper questions in the PPSC + FPSC banks are tagged to this topic’s sub-topics (inventors 90; discoveries 66; instruments 33) — the site serves them as this chapter’s practice set, with the IBES Everyday Science capsule questions behind them. Note for the build: the practice set is filtered by the topic’s subject+topic tags at serve time, so exploration questions (America, sea route), resource questions (Sui gas, coal reserves) and English-vocabulary questions using “discover” are excluded from this set by design, even though they contain the same words; the television question serves the Baird standard answer, with the single Jenkins-keyed paper flagged in Section 10.
- Companion practice (retrospective): the gk360 monthly CA bank’s 2025 science set behind Section 7A — 14 cited rows (12 × 2025 files / 1,416 questions; script hidden_files/goldmine-notes-count-eds08-2025science.py: Science & Tech topic rows 90), of which the 10 table rows are taught and 3 rows are held, not taught (Feicheng CAES 2024 plant, Ahmad Abbas claim, third-shortest-day detail — see Section 10).
- Book mode: ← Previous: Chemistry in Daily Life · Next: Energy & Environment (Everyday Science) →
Goldmine Notes · Everyday Science · Chapter 8 · Sources: verified PPSC/FPSC past-paper banks (189 topic questions, script-counted, hidden_files/goldmine-notes-count-eds08b.py); IBES Everyday Science capsule bank (discoveries/inventions blocks and instrument MCQs, incl. vernier 0.1 mm / screw gauge 0.01 mm least counts, smallpox vaccine 1796, penicillin 1928, insulin year, Laennec stethoscope, Torricelli barometer, Fahrenheit thermometer, Geiger counter, dosimeter, cyclotron, chronometer); invention years verified against standard references via web check (telephone 1876, bulb 1879, aeroplane 1903, printing press 1440, Watt 1769/1775, radio 1895, safety pin 1849, ball-point pen 1938, fountain pen 1884, mobile phone 1973 and transistor 1947 / integrated circuit 1959 from bank keys). Section 7A retrospective sources: gk360 monthly CA bank 2025 files (script hidden_files/goldmine-notes-count-eds08-2025science.py) + standard-reference web checks (CR450 test speeds via China Daily/Railway Pro; Motuo start 19 July 2025 via CIWEM/press; Tianshan Shengli opening 26 December 2025 via SCMP/Xinhua; Australia ban in force 10 December 2025 via Reuters/University of Sydney; kangaroo IVF February 2025 via University of Queensland; Peñico 3 July 2025 via Reuters/BBC; Afar June 2025 study via Nature Geoscience; Norway electric plane 4 September 2025 via AFP/Avinor; Quantum Year 2025 via UN/NQCC; India hydrogen coach July 2025 via Railway Technology/Ministry reporting). PMS Screening 2026 GK High Yield Mock 14 residue added 2026-11-03 (Lavoisier Father of Modern Chemistry title; no mark claimed). Standard answers only.
