Inventions The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project? Robert Oppenheimer James B. Conant Vannevar Bush Leslie R. Groves Robert Oppenheimer James B. Conant Vannevar Bush Leslie R. Groves ANSWER DOWNLOAD EXAMIANS APP
Inventions What Thomas Davenport invented? Screw propellor Chesterfield Electric streetcar Sleeping (railway) car Screw propellor Chesterfield Electric streetcar Sleeping (railway) car ANSWER DOWNLOAD EXAMIANS APP
Inventions Who invented Bifocal Lens? Thomas Alva Edison Alfred B. Nobel Rudolf Diesel Benjamin Franklin Thomas Alva Edison Alfred B. Nobel Rudolf Diesel Benjamin Franklin ANSWER DOWNLOAD EXAMIANS APP
Inventions What J. B. Dunlop invented? Model airplanes Pneumatic rubber tire Automobile wheel rim Rubber boot Model airplanes Pneumatic rubber tire Automobile wheel rim Rubber boot ANSWER DOWNLOAD EXAMIANS APP
Inventions Which of the following was first patented by an Australian in 1889? Electric Fence Electric Drill Electric Shaver Electric Heater Electric Fence Electric Drill Electric Shaver Electric Heater ANSWER DOWNLOAD EXAMIANS APP
Inventions When were blue jeans invented? 1860s 1900s 1850s 1870s 1860s 1900s 1850s 1870s ANSWER DOWNLOAD EXAMIANS APP
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