Chemistry
Which one of the following acids is used in battery ?

Sulphurous acid
Hydrofluoric acid
Sulphuric acid
Hydrochloric acid

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Chemistry
Water cycle refers to

Water distribution in relatively dry areas
Constant movement of water from ocean to land and back to ocean once again
Scientific management of water in areas excessively plagued with water-logging
An integrated attempt to recycle water in relatively arid regions

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