Exercise 1

Question 26 :

The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project?


A). Robert Oppenheimer
B). James B. Conant
C). Leslie R. Groves
D). Vannevar Bush
Answer : Option A

Explanation :

Leslie R. Groves, however, was the military head of the project and the overall supremo, while Robert Oppenheimer was the scientific director. The world's first atomic bomb was exploded in the New Mexico desert on July 16, 1945.


Question 27 :

When was the first lawn mower invented?


A). 1830
B). 1854
C). 1835
D). 1849
Answer : Option A

Explanation :

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.


Question 28 :

In which decade were the first successful diode and triode vacuum tubes invented?


A). 1800s
B). 1880s
C). 1890s
D). 1900s
Answer : Option D

Explanation :

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.


Question 29 :

Who is the English physicist responsible for the 'Big Bang Theory'?


A). Albert Einstein
B). Michael Skube
C). George Gamow
D). Roger Penrose
Answer : Option C

Explanation :

George Gamow. Gamow, who died in 1968, was a physicist, who published "Thirty Years that Shook Physics".


Question 30 :

What 'game' was first produced by the Southern Novelty Company in Baltimore, Maryland in 1892?


A). Frisbee
B). Monopoly
C). Ouija board
D). Ping Pong
Answer : Option C

Explanation :

The board was invented by Isaac and William Fuld. The word 'Ouija' comes from the French and German words for 'yes', 'oui' and 'ja'.