Question

Water filled in two glasses A and B have BOD values of 10 and 20 respectively. The correct statement regarding them is :

• A. A is suitable for drinking, whereas B is not
• B. A is more polluted than B
• C. B is more polluted than A
• D. Both A and B are suitable for drinking

Answer 1

The correct option is C B is more polluted than A

Higher BOD indicates more oxygen is required, which is less for oxygen-demanding species to feed on, and signifies lower water quality. Inversely, low BOD means less oxygen is being removed from water, so water is generally purer.
Two glasses "A" and "B" have BOD values 10 and "20", respectively. Hence glass "B" is more polluted than glass "A".