Inventions Who invented Gunpowder? Roger Bacon Sir Frank Whittle Leo H Baekeland G. Ferdinand Von Zeppelin Roger Bacon Sir Frank Whittle Leo H Baekeland G. Ferdinand Von Zeppelin ANSWER DOWNLOAD EXAMIANS APP
Inventions What Thomas Davenport invented? Screw propellor Chesterfield Sleeping (railway) car Electric streetcar Screw propellor Chesterfield Sleeping (railway) car Electric streetcar ANSWER DOWNLOAD EXAMIANS APP
Inventions What charge card, developed in 1950, was the first to be accepted nationally in the US? MasterCharge Diner's Club Discover Visa MasterCharge Diner's Club Discover Visa ANSWER DOWNLOAD EXAMIANS APP
Inventions Who synthesized the first wholly artificial gene? Meghnad Saha J.J. Thompson Benjamin Franklin Hargobind Khorana Meghnad Saha J.J. Thompson Benjamin Franklin Hargobind Khorana ANSWER DOWNLOAD EXAMIANS APP
Inventions Which insurance salesman invented the fountain pen in 1884? Charles Kettering Sir William Grove George Fountain Lewis Edson Waterman Charles Kettering Sir William Grove George Fountain Lewis Edson Waterman ANSWER DOWNLOAD EXAMIANS APP
Inventions What item, originally called the 'Whirlwind', was invented by Ives McGaffey in 1869? Vacuum cleaner Washing machine Blender Electric mixer Vacuum cleaner Washing machine Blender Electric mixer ANSWER DOWNLOAD EXAMIANS APP
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