A method used to kill harmful germs present in water is:

1. sedimentation
2. decantation
3. boiling
4. filtration

Sea water is not fit for drinking because it contains a large amount of:

1. suspended impurities
2. sugar
3. dissolved salts
4. none of the above

Distilled water is:

1. salty
2. sweet
3. sour
4. tasteless

Which of the following is a water-borne disease?

1. Influenza
2. Typhoid
3. COVID-19
4. Malaria