What James Watt invented?
Diving bell
Steam boat
Hot air balloon
Rotary steam engine
Who invented penicillin ?
Ronald rose
Charles Darwin
Alexander Fleming
Edison
This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.
George Washington
Alexander Hamilton
John Adams
Thomas Jefferson
Who invented Electric lamp?
Laennec
John Baird
Thomas Alva Edison
None of these
Which scientist discovered the radioactive element radium?
Isaac Newton
Albert Einstein
Benjamin Franklin
Marie Curie
Who invented Bicycle ?
When was barb wire patented?
1873
1840
1895
1900
Who invented Aeroplane ?
Roentgen invented:
When was the first elevator built?
1743
1739
1760
1785
