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In water treatment, rapid gravity filters are adopted to remove:

ADissolved organic substances

BDissolved solids and gases

CFloating solids and dissolved inorganic solids

DBacteria and colloidal solids

Answer:

D. Bacteria and colloidal solids


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Consider the given statement to be true and decide which of the given conclusions can definitely be drawn from the statement.

Statement:

Many people living in villages relocate to cities for a better future.

Conclusions:

1. Government officers should have compulsory rural posting.

2. Increase more transport facilities between cities and villages.