Inventions and Discoveries


91. Who discovered the principles of the steam engine?
a) James Watt
b) Thomas Savery
c) Thomas Newcomen
d) George Stephenson

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92. Who invented the first practical refrigerator?
a) William Cullen
b) Carl von Linde
c) Jacob Perkins
d) John Gorrie

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93. Who discovered the law of conservation of energy?
a) James Prescott Joule
b) Michael Faraday
c) Georg Simon Ohm
d) Lord Kelvin

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94. Who invented the first successful electric light bulb?
a) Thomas Edison
b) Joseph Swan
c) Nikola Tesla
d) George Westinghouse

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95. Who discovered the principle of the steam turbine?
a) Charles Parsons
b) Robert Stirling
c) James Watt
d) George Stephenson

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