If you fail, never give up because FAIL means 'First Attempt In Learning'.— A. P. J. Abdul Kalam

Air and Water Quality — quick quiz

5 real WB TET questions on Air and Water Quality. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.

Question 1 of 5

MEDIUM

A water sample was tested in a laboratory and found to contain harmful bacteria and dissolved salts. Which method would be most effective to make this water safe for drinking?