Pollution of Air & Water

Water from natural sources is treated from _________

• Microorganisms

• Toxic Materials

• Food

• None of these

Potable water is used for ________ purposes

• Bathing

• Watering

• Cleaning

• Drinking

Water purification means the process of removing undesirable chemicals, ___________________ from water.

• biological contaminants

• suspended solids

• and gases

When water is poured, the impurities do not pass through the _______

• Holes

• Gap

• Pores

Which of the following are added before the water reaches the Clean Water Tank?

• Fluoride

• Ammonia

• Chlorine

• Fluorine

What is sedimentation process in Water Purification?

• Settling of matter

• Cleaning of water through pores

• None of these

_________ process is only used to treat small quantities of water.

• Boiling

• Chemical Treatment

• Water Purifying gadgets

Water can be purified by addition of disinfectants in correct proportion. Which process is this?

Purification of water is done at a large scale in a ____________. (Write all words in small letters.)

Water from a river is made free from large entities such as leaves, twigs, etc. by passing them through ______. (Write the first letter in Uppercase... If there is a second word no need for writing the first letter in uppercase)