Internet protocol suite which created basis for modern internet was developed by
Answer: D
Vinton Cerf and Robert Kahn developed it.
Their 1974 paper set out TCP, later split into TCP and IP, which lets networks of different kinds carry one another's traffic. That is what turned a collection of separate networks into an internet.
Please log in or register to report this question.
Who invented the electric light bulb?
Answer: B
Thomas Alva Edison.
He did not invent the idea of the electric lamp but produced the first commercially practical one in 1879, with a carbonised filament in a high vacuum that burned for over forty hours. Joseph Swan in England developed one independently at the same time.
Please log in or register to report this question.
Streptomycin was invented by
Answer: C
Selman Waksman discovered streptomycin.
He and his student Albert Schatz isolated it from a soil actinomycete in 1943; it was the first effective treatment for tuberculosis. Waksman coined the word antibiotic and received the Nobel Prize in 1952.
Please log in or register to report this question.
Which insurance salesman invented the fountain pen in 1884?
Answer: A
Lewis Edson Waterman invented it.
The insurance salesman patented a fountain pen with a capillary feed in 1884, after - by his own account - a leaking pen ruined a contract he was about to have signed. The feed let air in as ink flowed out, which stopped the blotting.
Please log in or register to report this question.
What did Thomas Davenport invent?
Answer: B
He invented the electric streetcar.
Thomas Davenport, a Vermont blacksmith, built the first practical direct-current electric motor in 1834 and used it to run a small electric car on a circular track - the first electric railway, though batteries made it uneconomic at the time.
Please log in or register to report this question.
Sodium was discovered by
Answer: A
Sir Humphry Davy discovered sodium.
He isolated it in 1807 by passing a current through molten caustic soda, and potassium by the same means days earlier. Electrolysis gave him six new elements within two years.
Please log in or register to report this question.
First graphical user interface used commercially after its introduction was popularized as
Answer: D
Both the Xerox Star and the Apple Lisa.
The Star of 1981 was the first commercial computer with a graphical interface, windows, icons and a mouse, and the Lisa of 1983 brought the idea to a wider market. Both drew on research at Xerox PARC in the 1970s.
Please log in or register to report this question.
Who invented logarithms?
Answer: B
John Napier invented logarithms.
The Scottish laird published his tables in 1614 after twenty years of calculation, turning multiplication into addition. Laplace said they doubled the working life of an astronomer.
Please log in or register to report this question.
Stethoscope was invented by
Answer: D
Rene Laennec invented the stethoscope.
In 1816, reluctant to put his ear to a young woman's chest, he rolled a sheet of paper into a tube and found the heart sounds clearer than before. He then made a wooden cylinder; the binaural form came later.
Please log in or register to report this question.
Who is credited with inventing the supercomputer?
Answer: C
Both are credited.
Seymour Cray designed the CDC 6600 of 1964, generally reckoned the first supercomputer, and went on to found Cray Research. J.H. Van Tassel worked with him on the machine.
Please log in or register to report this question.
