Almost every "-meter" measures something, and almost every "-scope" lets you see or hear something. Learn those two endings and half this topic is already done.
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The ending -meter comes from a word meaning "to measure". The first part of the name tells you what it measures — thermo = heat, baro = weight (of air), anemo = wind.
The pair examiners love: a speedometer shows how fast the vehicle is going right now, while an odometer shows the total distance it has travelled. Both sit on the same dashboard — do not mix them up.
-scope comes from a word meaning "to look at". These are the instruments that extend our own senses — and several of them are used by the armed forces.
🎖️ Two defence favourites
RADAR 📡
Uses radio waves to find aircraft and ships that are far away, and to measure how far off they are.
SONAR 🌊
Uses sound waves to find objects under water — submarines, shipwrecks and the depth of the sea.
Easy memory hook: radar works in the air, sonar works in the sea (sound travels well in water).
These are things in your own home. AISSEE asks why they work, not just what they are called.
💡 A few inventions worth remembering
📞 Telephone — Alexander Graham Bell
💡 Electric bulb — Thomas Alva Edison
📻 Radio — Guglielmo Marconi
✈️ Aeroplane — the Wright brothers
🔭 First to study the sky with a telescope — Galileo
💉 Vaccination (smallpox) — Edward Jenner
12 AISSEE-style GK questions on scientific devices. 🍀
