Concept_2.3

Choose:
All the following can pass through filters during desalination of water, except --------

• salts

• minerals

• seaweed

• gases

Choose:
On decreasing the temperature of water vapor, it .......

• freezes

• condenses

• melts

• evaporates

Choose:

Cutting a paper into small pieces causes a change in its ---------

• shape only

• size only

• shape and color

• shape and size

True or false:

Melting and evaporation take place by heating.

• True

• False

True or false:

After desalination process, the water that is returned back to oceans is useful to marine life.

• True

• False

True or false:
Ice is turned into water by melting process.

• True

• False

Correct the underlined words:

When a matter is heated, its particles move slower.

Correct the underlined words:

Producing ash from burning of wood is considered as a physical change.

What happens to ...?

The distance between particles of water vapor when it touches a cold surface.

Give a reason:

Coloring a paper is considered as a physical change.