The centre of the reflecting surface of a spherical mirror is called the
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Who was the dentist who killed Cecil-the Lion in 2015?
Chinese spacecraft Chang’e 5 has returned to the Earth, carrying samples from which astronomical body?
Which one of the following is the largest source of natural energy to humans?
In a plant, which of the following is converted into seed?
___ is a multicellular organism.
Ice floats on water because its density is
The people of the Indus Valley Civilisation worshipped ___