Who invented Bicycle ?
In which decade was the first solid state integrated circuit demonstrated?
1950s
1960s
1970s
1980s
What James Watt invented?
Diving bell
Steam boat
Hot air balloon
Rotary steam engine
Who invented Printing press?
Macmillan
Waterman
Gutenberg
none of these
Who invented Radio?
Marconi
Torricelli
Which scientist discovered the radioactive element radium?
Isaac Newton
Albert Einstein
Benjamin Franklin
Marie Curie
Roentgen invented:
What J. B. Dunlop invented?
Pneumatic rubber tire
Automobile wheel rim
Rubber boot
Model airplanes
When was the first elevator built?
1743
1739
1760
1785
Who invented Television ?
