Inventions In which decade were the first successful diode and triode vacuum tubes invented? 1800s 1880s 1900s 1890s 1800s 1880s 1900s 1890s ANSWER DOWNLOAD EXAMIANS APP
Inventions What Thomas Davenport invented? Screw propellor Electric streetcar Sleeping (railway) car Chesterfield Screw propellor Electric streetcar Sleeping (railway) car Chesterfield ANSWER DOWNLOAD EXAMIANS APP
Inventions Who among the following invented the small pox vaccine? Robert Hooke Louis Pasteur Edward Jenner Robert Koch Robert Hooke Louis Pasteur Edward Jenner Robert Koch ANSWER DOWNLOAD EXAMIANS APP
Inventions What invention was first installed at a Hartford, Connecticut bank in 1889? Burglar alarm Pay telephone Automatic teller machine Time-lock safe Burglar alarm Pay telephone Automatic teller machine Time-lock safe ANSWER DOWNLOAD EXAMIANS APP
Inventions What Enrico Fermi invented? Nuclear reactor X ray machine Cyclotron Betatron Nuclear reactor X ray machine Cyclotron Betatron ANSWER DOWNLOAD EXAMIANS APP
Inventions What Sir Isaac Newton invented? Microscope Reflecting telescope Spectacles Chronometer Microscope Reflecting telescope Spectacles Chronometer ANSWER DOWNLOAD EXAMIANS APP
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