Revision Quiz 1

The availability of fresh water on Earth is.

• 2.5%

• 3%

• 5%

• 3.5%

The Maldives had declared a state of water crisis after a fire in

• November 2015

• December 2015

• December 2016

• November 2016

Mention any two reasons for water crisis.

• Short supply of water and growing need for water

• High rainfall

• Deforestation

• More availability of water

Which are the human activities that affects water quality?

• boiling of water

• Sewage disposal

• Use of fertilizers and pesticides

• chemical treatment

Which of the following protects earth from harmful radiations of sun.

• Trees

• Clouds

• Atmosphere

• Ozone

Which are the two methods for maintaining water quality.

• Adding harmful chemicals

• Adding chlorine tablets

• Acidification

• Boiling of water

Water is a ................................ solvent.

• heavy

• hard

• liquid

• universal

Water is .......................

• an element

• a compound

• a mixture

• none of these

Water is composed of ............................

• Hydrogen & Oxygen

• Only Hydrogen

• Only oxgen

• Nitrogen

Gold is ..............................

• a compound

• an element

• a mixture

• both element & mixture