The Arabic work of al-Biruni that gave an account of the subcontinent is called __________.
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Inderjeet Singh is related to ______.
The first large scale electrical air conditioning was invented and used in 1902 by
If the diameter of a sphere is 14 cm, then what is the surface area (in sq.cm) of the sphere?
The Agra fort was built by ___________.
Who invented the thermos flask?
Who discovered the colour photography?
Who Invented Neon Lamp?