Revision

It contains .... of nitrogen in the atmosphere

• 78%

• 21%

• 12%

• 35%

... is formed due to evaporation of water by the heat of the sun

• argon

• pollution

• water vapour

• oxygen

The water that you drink is called ..

• useful water

• potable water

• rain water

• sea water

During desalination process minerals will be removed from saline water

• calcium

• protein

• mineral

• vitamins

Maldives is part of the intergrated water Resources Mnagement( IWRM) which include --- small island developing states in Atlantic and Indian Ocean.

• 8

• 6

• 7

• 9

In Male' desalination water is supplied to household via ..

• WIFI

• meter network

A bundle of light is called....

• a beam of light

• a ray of light

• shadow

• path of light

The ablitity of light travel in straight line is called

• ray of light

• rectilinear propagation

• beam f light

Shadows are made when........

• an object blocks light

• object let the light pass through

The picture we see in the mirror is..

• vision

• image

• light

• reflection