L2_WATER

Question 1

a combination of two elementary substances hydrogen and oxygen

Answer 1

water

Question 2

3 sources of water

Answer 2

1. Rain fall
2. Natural Surface
3. Underground water

Question 3

water from streams, rivers and lakes, ponds

Answer 3

Natural surface

Question 4

deep and shallow wells

Answer 4

Underground water

Question 5

Methods of purification and treatment of water

Answer 5

1. Sedimentation
2. Chemical Treatments
3. Filtration
4. Aeration

Question 6

articles of matters that are suspended in the water are allowed to stay in a container so that they will settle in the bottom, then drawing the water out,
leaving these sediments in the container.

Answer 6

Sedimentation

Question 7

given to kill the harmful bacterias present and to cure the turbid taste or mudtaste, remove clay, salts, iron etc. commonly used chemical is chlorine.

Answer 7

Chemical treatments

Question 8

water are filtered on various processes, so as to remove the particles of vegetable matter, mud, and other particles of matter present in the water, most commonly used materials are sand and gravel.

Answer 8

Filtration
Two Process
1. Slow process
2. Mechanical or rapid process

Question 9

raw water is made to pass on pipes tiny sieves and exposed to air of fine mist.

Answer 9

Aeration

Question 10

wells excavated from hand
for shallow water

Answer 10

Dug Wells

Question 11

Wells sunk by machine
when water is tapped from the fissures

Answer 11

Deep wells
Driven