World Science and Technology – Exercise – 3

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

(a) 1800s
(b) 1880s
(c) 1890s
(d) 1900s

Answer
Answer : (d)
Explanation
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. Let us discuss.
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112. In which decade was the telephone invented?

(a) 1850s
(b) 1860s
(c) 1870s
(d) 1880s

Answer
Answer : (c)
Explanation
Explanation : Alexander Graham Bell’s notebook entry of 10 March 1876 describes his successful experiment with the telephone. Speaking through the instrument to his assistant, Thomas A. Watson, in the next room, Bell utters these famous first words, “Mr. Watson — come here — I want to see you”. Let us discuss.
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113. In which decade was the Internet first implemented?

(a) 1940s
(b) 1950s
(c) 1960s
(d) 1980s

Answer
Answer : (c)
Explanation
Explanation : The first message ever sent over what is now called the Internet took place at 10:30PM on October 29, 1969. Back then, the Department of Defense called it ARPAnet (Advanced Research Projects Agency network). Let us discuss.
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114. In which decade was the first solid state integrated circuit demonstrated?

(a) 1950s
(b) 1960s
(c) 1970s
(d) 1980s

Answer
Answer : (a)
Explanation
Explanation : On September 12, 1958, Jack Kilby demonstrated the first working IC while working for Texas Instruments, although the U.S. patent office awarded the first patent for an integrated circuit to Robert Noyce of Fairchild. Let us discuss.
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115. In which decade was the transistor invented?

(a) 1940s
(b) 1950s
(c) 1960s
(d) 1980s

Answer
Answer : (a)
Explanation
Explanation : On December 23, 1947, William Shockley, Walter Brattain and John Bardeen, of Bell Labs, announced their discovery of the point-contact germanium transistor to management. Let us discuss.
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