Who invented the contact lens?
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Robert Hooke discovered cells by observing them in a ______.
The first large scale electrical air conditioning was invented and used in 1902 by
In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.
a rich source of something
Which of the following is natural fiber?
Depletion of ozone layer causes
Where was the 'Azad Hind Fauj' founded?
Who is the present (2017) Secretary General of SAARC?
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