31. When was the first lawn mower invented?
a. 1830
b. 1854
c. 1835
d. 1849

Option “A” is correct.
The first lawn mowers were not engine powered. Invented in 1830 by Edwin Budding of England, the mowers were turning blades on wooden sticks used to cut grass. Engine powered mowers were not invented until 1919 by an American Army colonel, who used the motor from a washing machine.
32.
In which decade were the first successful diode and triode vacuum tubes invented?
a. 1800s
b. 1880s
c. 1890s
d. 1900s

Option “D” is correct.
In 1904, John Ambrose Fleming invented the first practical electron tube called the ‘Fleming Valve’, which is a diode rectifier. In 1906, Lee de Forest invented the Audion later called the triode, which provided signal amplification.
33. Who is the English physicist responsible for the ‘Big Bang Theory’?
a.
b.
c.
d.

Option “C” is correct.
George Gamow, who died in 1968, was a physicist, who published “Thirty Years that Shook Physics”.
34. What ‘game’ was first produced by the Southern Novelty Company in Baltimore, Maryland in 1892?
a. Frisbee
b. Monopoly
c.
d.

Option “C” is correct.
The board was invented by Isaac and William Fuld. The word ‘Ouija’ comes from the French and German words for ‘yes’, ‘oui’ and ‘ja’.
35. Which insurance salesman invented the fountain pen in 1884?
a.
b.
c.
d.

Option “A” is correct.
Lewis Edson Waterman patented the first practical fountain pen in 1884.
36. What invention is credited to the Russian born American inventor Vladimir Kosma Zworykin?
a. Telegraph
b. Radio
c. Television
d. Dishwasher

Option “C” is correct.
Vladimir Zworykin, in full Vladimir Kosma Zworykin, (born July 29 [July 17, Old Style], 1888, Murom, Russia—died July 29, 1982, Princeton, New Jersey, U.S.), Russian-born American electronic engineer and inventor of the iconoscope and kinescope television systems.
37. 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?
a. Banjo
b. Oboe
c. Clarinet
d.

Option “D” is correct.
Ben also holds a lot of firsts – first U.S. ambassador, first political cartoonist, first American philosopher, organized the first fire department, and on and on.
38. What Thomas Davenport invented?
a.
b.
c. Chesterfield
d.

Option “B” is correct.
Thomas Davenport (9 July 1802 – 6 July 1851) was a Vermont blacksmith who constructed the first American DC electric motor in 1834.
39. What Elisha Otis invented?
a.
b.
c. Turbine
d.

Option “A” is correct.
In 1853, American inventor Elisha Otis demonstrated a freight elevator equipped with a safety device to prevent falling in case a supporting cable should break. This increased public confidence in such devices. Otis established a company for manufacturing elevators and patented (1861) a steam elevator.
Many people think that he invented the elevator, but the truth is, he invented the elevator brake. He also invented the railway safety brake.
40. Where was the yo-yo invented?
a. France
b.
c. Philippines
d. England

Option “C” is correct.
The yo-yo was first used by hunters as weapons. They were wooden disks on strings. In the 1920s, a man from the U.S. named Donald Duncan made the yo-yo into a toy after he visited the Philippines.
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