111. What Elmer A. Sperry invented?
(a) Hydroplane
(b) Hydraulic turbine
(c) Magnetic compass
(d) Gyrocompass
112. What James Watt invented?
(a) Diving bell
(b) Steam boat
(c) Hot air balloon
(d) Rotary steam engine
113. What Enrico Fermi invented?
(a) X ray machine
(b) Betatron
(c) Cyclotron
(d) Nuclear reactor
114. What Benjamin Franklin invented?
(a) Bifocal spectacles
(b) Radio
(c) Barometer
(d) Hygrometer
115. What Sir Isaac Newton invented?
(a) Reflecting telescope
(b) Chronometer
(c) Microscope
(d) Spectacles
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