Multiple choice general knowledge science & technology

What James Watt invented?

  1. Diving bell

  2. Steam boat

  3. Hot air balloon

  4. Rotary steam engine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

James Watt's major contribution was improving the steam engine, not inventing the first steam engine. His key innovation was the rotary motion mechanism (sun-and-planet gear, 1781) that enabled steam engines to drive machinery. Thomas Newcomen built the first practical steam engine (1712), and Watt's separate condenser (1769) greatly improved efficiency. Watt did not invent diving bells, steam boats, or hot air balloons.

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