The invention of the common kitchen refrigeration insulation system known as the domestic electric refrigerator was scaled by which engineer? MCQ with Answer and Explanation

Question

The invention of the common kitchen refrigeration insulation system known as the domestic electric refrigerator was scaled by which engineer?

A. Thomas Edison

B. Fred W. Wolf and Nathaniel B. Wales

C. Willis Carrier

D. James Dewar

Answer: Option B

Solution (By JKSSB Mock Tests)

Wolf invented early air-cooled attachment refrigerator units in 1913, and Wales engineered units that Kelvinator mass-marketed.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that electrical currents pass through vacuum cavities via discrete streams named 'Cathode Rays'?

A. William Crookes and Julius Plücker

B. J.J. Thomson

C. Wilhelm Röntgen

D. Michael Faraday

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Correct Answer: Option A

Explanation:
Plücker observed early glow phenomena, and Crookes engineered highly evacuated discharge tubes to isolate ray behaviors.

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Question #2

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The first electronic programmable digital computer, ENIAC, was designed by whom?

A. Charles Babbage

B. Alan Turing

C. John Mauchly and J. Presper Eckert

D. John von Neumann

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Correct Answer: Option C

Explanation:
ENIAC (Electronic Numerical Integrator and Computer) was constructed by Mauchly and Eckert at the University of Pennsylvania in 1945.

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Question #3

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Who invented the first practical electronic pocket calculator, introduced commercially in 1970?

A. Charles Babbage

B. Douglas Engelbart

C. Alan Turing

D. Sanyo and Texas Instruments teams

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Correct Answer: Option D

Explanation:
Sanyo's ICC-0081 and Texas Instruments' 'Cal-Tech' project initiated the mass scaling of hand-held microelectronic computation.

This question belongs to: Static General Knowledge Inventions and Discoveries

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