Multiple choice

Which invention was the earliest?

  1. Vacuum cleaner

  2. Dish washer

  3. Air Conditioner

  4. Chain saw
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The dishwasher was first patented in 1850 by Joel Houghton, with the first practical commercial model invented by Josephine Cochrane in 1886. The vacuum cleaner, air conditioner, and chainsaw were all developed later, in the late 19th and early 20th centuries.

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