Direction How well do you know the famous inventors of the world? The tests below will test your knowledge when it comes to famous inventors and what they invented.
31.

Who invented the Thermos flask?
A. Charles Thermos B. James Dewar
C. Aleksandr Dianin D. Akinfiy Demidov
Answer and Explanation
Answer: Option B
Explanation:
32.

Who invented the Ceiling fan and the electric sewing machine?
A. Roald Drie B. James Hoover
C. Philip Swindle D. Philip Diehl
Answer and Explanation
Answer: Option D
Explanation:
33.

Who invented the Diesel engine?
A. Francois Petroleum B. Rudolf Benz
C. Vin Diesel D. Rudolf Diesel
Answer and Explanation
Answer: Option D
Explanation:
34.

Who invented the Dolby noise-reduction system?
A. Timothy Loewe B. Bunsuthar Bose
C. Ray Dolby D. Ray Ban
Answer and Explanation
Answer: Option C
Explanation:
35.

Who invented the ejection seat?
A. William H. Dobelle B. Lee DeForest
C. William Kennedy Laurie Dickson D. Anastase Dragomir
Answer and Explanation
Answer: Option D
Explanation: