Water A Precious Resource Test - 1

Explanation:

The process of changing water into water vapour on heating is called as evaporation. Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance. 

Explanation:

40 litres of water is recommended by United Nation per person per day to all the day to day activities. As our body is made up of 70% of water content which is required by cells, tissues and blood etc. Water is also required for the removal of toxins from the body in the form of urine and perspiration.

Explanation:

Earth appear blue from sky due to presence of large surface covered with water. About 2/3 of earth surface is covered with water. Blue light is scattered in all the directions by the tiny molecules of air and water molecules present in ocean due to its smaller wavelength  as water molecules absorb red light so when it is observed from the sky or space it appears blue

Explanation:

In atmosphere, water is present in form of water vapour along with other gases of atmosphere. It is one of the state of water within the hydrosphere. It can be produced from the evaporation or boiling of liquid waterIt is lighter than air and triggers convection currents that can leads to clouds.

Explanation:

Total water is maintained by water cycle during which evaporation and condensation of water takes place. Water cycle is the process by which water circulates between the earth's oceans, atmosphere and land involving precipitation as rain and snow, drainage in streams and rivers and return to the atmosphere by evaporation and transpiration. 

Explanation:

Drip irrigation is a form of irrigation that saves water and fertilizer by allowing water to drip slowly to the roots of many different plants, either into the soil surface or directly into the root zone, through a network of valves, pipes, tubing, and emitters.

Explanation:

There is acute shortage of drinking water in the world due to growing population and overuse in other activities. Out of 70 % hardly 3% of water is available for drinking and for other household acvtivities and this too is available in the form of glaciers,lakes, rivers etc. But maximum water is polluted due to presence of unwanted polluted substances from agriculture, industries, domestic use making it unsafe for drinking.

Explanation:

In India, agricultural sector is major user of water as plants require water at regular interval of time. As agriculture is the backbone of India, and it requires maximum amount of water for irrigation. 

Explanation:

Rainwater harvesting is a method of collecting rainwater and directing into ground to maintain the ground water level. It is a technique used for collecting, storing and using rainwater for landscape irrigation and other uses. It is collected from various surfaces such as rooftops or man made aboveground hard surfaces.

Explanation:

About 70% of our body consists of water. It forms the main constituent of cell, tissue and blood. The percentage of body water contained in various fluid compartments add upto total body water (TBW). This water makes up significant fraction of a human body both by weight and by a volume.