The Computer, Step by Step
Processors, memory, storage and what each part actually does.
What does the CPU do?
A handful of inventions bent the whole course of history. See how many of their origins you can pin down.
Some inventions did more than solve a problem; they rearranged how everyone afterwards lived. This quiz looks at the breakthroughs that changed the course of history, from tools that reshaped work to machines that shrank distance and time. The interesting part is rarely just who invented what, but why an idea caught on when it did and what it made possible next. Each question comes with an explanation that fills in that story, so the answers land as more than names and dates. It is a quick tour through the moments when a single idea tipped the world onto a different path.
Every question in this quiz is listed below with its correct answer and the reasoning behind it. Play first if you would rather not see the answers — or read through as a study sheet.
Play it insteadAnswer: A. Johannes Gutenberg
Why: Johannes Gutenberg's press made books affordable and helped spread literacy across Europe.
Answer: D. The telephone
Why: Bell was granted the first United States patent for the telephone in 1876.
Answer: D. Tim Berners-Lee
Why: Tim Berners-Lee proposed the Web while working at CERN in 1989, and built the first browser and server.
Answer: A. The first powered aeroplane flight
Why: The Wright Flyer made the first sustained, controlled, powered aeroplane flight in 1903 at Kitty Hawk.
Answer: A. Alexander Fleming
Why: Alexander Fleming discovered penicillin after noticing mould killing bacteria in a petri dish in 1928.
Answer: A. Thomas Edison
Why: Thomas Edison developed a long-lasting filament that finally made electric light practical for everyday use.
Answer: C. James Watt
Why: James Watt's improvements in the 1770s made steam engines far more efficient and widely usable in industry.
Answer: B. The transistor
Why: The transistor replaced bulky vacuum tubes and made compact, reliable computing possible.
Inventions That Changed Everything has 8 questions and takes about 8 minutes to finish. It is rated Medium and sits in our Technology category.
Each of the 8 correct answers adds 10 XP, up to 80 XP for a clean run. Wrong answers cost you nothing, and your full question-by-question review is shown at the end.
Yes. All 8 questions carry a written explanation of why the correct answer is right, so the quiz works as a study sheet as well as a test.
Yes, as often as you like. The questions and the answer options are reshuffled on each run, and you can use Practice Mistakes afterwards to retry only the ones you missed. No account is needed to play.
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