Which is the closest star to our solar system?
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June 21 marks the winter solstice in the _________ Hemisphere.
Study of earth is known as
The force of friction between two surfaces will increase if:
The given symbol stands for a/an ___ in an electric circuit.
What is the reason for formation of Mirage in desert?
The absolute refractive index of air is
Black soil is also known by which of the following name ?