Concentration of water vapour in troposphere is
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__________ acts as a shield absorbing ultraviolet radiation from the sun.
The work done in one complete revolution of the moon around the earth is equal to
Which of the following can neither be created nor be destroyed?
The energy stored in a dry cell is in the form of
Punched card is also called
If 3P/7 = 4Q/11, then what is the ratio of P and Q respectively?
During the reign of which dynasty was the Great Wall of China constructed?
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