Inventions In which decade were the first successful diode and triode vacuum tubes invented? 1880s 1890s 1800s 1900s 1880s 1890s 1800s 1900s ANSWER DOWNLOAD EXAMIANS APP
Inventions What charge card, developed in 1950, was the first to be accepted nationally in the US? Discover MasterCharge Diner's Club Visa Discover MasterCharge Diner's Club Visa ANSWER DOWNLOAD EXAMIANS APP
Inventions Benjamin Franklin was a prolific inventor. He invented the lightning rod, the Franklin stove, studied electricity, discovered the Gulf Stream, started the first library, and on and on. Among his many other inventions, what musical instrument did he invent? Oboe Clarinet Banjo Harmonium Oboe Clarinet Banjo Harmonium ANSWER DOWNLOAD EXAMIANS APP
Inventions Which scientist discovered the radioactive element radium? Albert Einstein Isaac Newton Marie Curie Benjamin Franklin Albert Einstein Isaac Newton Marie Curie Benjamin Franklin ANSWER DOWNLOAD EXAMIANS APP
Inventions Who came up with the idea for INSTANT MASHED POTATO? W. Raleigh S. Tuberosum K. Edwards E. Asselbergs W. Raleigh S. Tuberosum K. Edwards E. Asselbergs ANSWER DOWNLOAD EXAMIANS APP
Inventions Who invented Gunpowder? Sir Frank Whittle Leo H Baekeland G. Ferdinand Von Zeppelin Roger Bacon Sir Frank Whittle Leo H Baekeland G. Ferdinand Von Zeppelin Roger Bacon ANSWER DOWNLOAD EXAMIANS APP
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