Water

Potable water is

• transparent.

• transparent and colourless.

• transparent, colourless and has taste.

• transparent, colourless, has taste and is free from germs.

Water used for chemical reactions in a laboratory is purified by ____.

• 
• 
• 
• 

Polluted water can cause ______________.

• malaria

• diarrhoea

• cancer

• heart disease

Water is called _______.

• universal solvent

• universal solute

• universal solution

• all of these

Vitreous membrane in the human eye contains _____ water.

• 2%

• 34%

• 56%

• 99%

What does the picture represent?

• Evaporation

• Condensation

• Water cycle

• Precipitation

Which is an example of gaseous state of matter?

• Water vapour

• Hail

• Snow

• Dew

The gases that cause acid rain are _____________.

• oxygen and carbon dioxide

• nitrogen dioxide and sulphur dioxide

• noble gases and sulphur dioxide

• oxygen and sulphur dioxide

What can you infer from picture shown here?

• Water is needed for plants.

• Plants need warmth.

• Plants release water vapour.

• Indoor plants should be covered.

One litre of sea water contains _____ of dissolved salts.

• 24 g

• 26 g

• 29 g

• 30 g