1
Q:

Air conditioner was discovered by

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

Answer:   C) Carrier



Explanation:
Subject: Inventions
Q:

App to locate board exam centre for students launched by ?

A) CBSE B) IIT
C) JNU D) NCERT
 
Answer & Explanation Answer: A) CBSE

Explanation:
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12 524
Q:

The first effective vaccine against polio was prepared by ?

A) Robert Edwards B) James Simpson
C) H Gibbon D) Jonas E Salk
 
Answer & Explanation Answer: D) Jonas E Salk

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10 785
Q:

Who is known as inventor of World Wide Standard Time ?

A) Sandford Fleming B) Fredrich
C) Williamson D) James Broot
 
Answer & Explanation Answer: A) Sandford Fleming

Explanation:

Sir Sandford Fleming, (January 7, 1827 – July 22, 1915) was a Scottish Canadian engineer and inventor. Born and raised in Scotland, he emigrated to colonial Canada at the age of 18. He proposed worldwide standard time zones, designed Canada's first postage stamp.

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6 665
Q:

Which object, initially called the 'Whirlwind', was invented by Ives McGaffey in 1869 ?

A) Washing machine B) Electric mixer
C) Vacuum cleaner D) Blender
 
Answer & Explanation Answer: C) Vacuum cleaner

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6 693