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Q:

Who Invented Microwave Oven ?

A) Lewis Edson Waterman	B) Levi Strauss
C) Percy LeBaron Spencer	D) Sir Sandford Fleming

Answer & Explanation Answer: C) Percy LeBaron Spencer

Explanation:

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Filed Under: Inventions

Q:

Who Invented Traffic Signal ?

A) Lewis Edson Waterman	B) Levi Strauss
C) Percy LeBaron Spencer	D) Garrett Augustus Morgan

Answer & Explanation Answer: D) Garrett Augustus Morgan

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Filed Under: Inventions

Q:

Who Invented Piano ?

A) Bartolomeo Cristofori di Francesco	B) Ruth Graves Wakefield
C) Adolf Gaston Eugen Fick	D) Jacques Cousteau

Answer & Explanation Answer: A) Bartolomeo Cristofori di Francesco

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Filed Under: Inventions

Q:

Who Invented The World Wide Web ?

A) Sir Timothy John	B) Earle Dickson
C) James Rineose	D) Laszlo Jozsef Biro

Answer & Explanation Answer: A) Sir Timothy John

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Filed Under: Inventions

Q:

Lift was invented by

A) Otis	B) Domagk
C) Lee De Forest	D) None of these

Answer & Explanation Answer: A) Otis

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Filed Under: Inventions

Q:

Typewriter was invented by

A) Shockley	B) Sholes
C) Howe	D) None of these

Answer & Explanation Answer: B) Sholes

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Filed Under: Inventions

Q:

Air conditioner was discovered by

A) Edison	B) Wilson
C) Carrier	D) Roentgen

Answer & Explanation Answer: C) Carrier

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Filed Under: Inventions

Q:

$(0.2 \times 0.2 + 0.01) {(0.1 \times 0.1 + 0.02)}^{- 1}$ is equal to

A) 5/3	B) 9/5
C) 41/4	D) 41/12

Answer & Explanation Answer: A) 5/3

Explanation:

Given expression = $\frac{(0.2 \times 0.2 \times 0.01)}{(0.1 \times 0.1 \times 0.02)} = \frac{0.04 + 0.01}{0.01 + 0.02} = \frac{0.05}{0.03} = \frac{5}{3}$

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Filed Under: Decimal Fractions

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