Test: Water - 1 - Class 2 MCQ

Human beings have certain basic needs. We must have food, water, air, and shelter to survive. If any one of these basic needs is not met, then humans cannot survive.

We get water from rain. Ponds and puddles are also filled with rain water. But not only this, the rain water also seeps inside the ground. In the space between the stones, sand, pebbles etc. which are under the soil, water keeps going down by seeping through the holes and crevices. The water that seeps down is groundwater, the same water we get in wells.

Seawater is toxic to humans because your body is unable to get rid of the salt that comes from seawater. Your body's kidneys normally remove excess salt by producing urine, but the body needs freshwater to dilute the salt in your body for the kidneys to work properly.

Tap water:- This is water that is delivered to the point of demand through a network of pipeline. Usually, it is expected to be safe for human consumption and other domestic demand. The water may be clean at it source like ground water, while some time it may require quality improvement through it treatment, example  water from the lake, Dams or rivers. There are different types of water treatment methods.

Dams have several benefits. They can be constructed to obstruct or control the flow of water in rivers and streams, to create a lake/ reservoir upstream of the river or to generate electricity.

Dams have several benefits. They can be constructed to obstruct or control the flow of water in rivers and streams, to create a lake/ reservoir upstream of the river or to generate electricity.

Canals are waterway channels, or artificial waterways, for water conveyance, or for servicing water transport vehicles. They carry free surface flow under atmospheric pressure, and can be thought of as artificial rivers.

Boiling. If you don't have safe bottled water, you should boil your water to make it safe to drink. Boiling is the surest method to kill disease-causing organisms, including viruses, bacteria, and parasites.

We should store drinking water in a covered container because it will protect the water from getting contaminated with dust, micro-organisms etc which can cause diseases. 
Families and communities can protect the water by covering the containers or vessels.

You can use the stored rainwater from your tank to clean your kitchen—that is, for washing and cleaning non–food preparation work surfaces, mopping floors, cleaning rags, etc. However, you cannot use untreated rainwater in food preparation and cleaning your kitchenware, utensils, etc