Boiling and Evaporation

What do you call the gaseous state of water which is formed when water is boiled?

• steam

• oxygen

• carbon dioxide

• water droplet

What do you call the gaseous state of water which is formed when water evaporates?

• water vapour

• oxygen

• carbon dioxide

• water droplet

What do you call the temperature at which the liquid boils?

• boiling point

• melting point

• evaporating point

• freezing point

What is the boiling point of water?

• 100°C

• 10°C

• 101°C

• 110°C

When water gains heat, its temperature ..............................

• increases

• decreases

• remains the same

When the liquid reaches its boiling point, the temperature ..............................

• increases

• decreases

• remains constant

A force exerted by air, on any surface in contact with it.

• air pressure

• gravity

• friction

• humidity

The higher the altitude, the .................... the air pressure.

• lower

• higher

The higher the altitude, the .................... the boiling point.

• lower

• higher

At which altitude does the water boil at the lowest temperature?

• At sea level

• At 4,400 metres above sea level

• At 8,800 metres above sea level

• At 1,800 metres above sea level