Water Online Test 6th Science Lesson 14 Questions in English

The Important basic substance of earth is water. It is used to regulate the temperature of earth and the temperature of living organisms.

Water is available in nature in three forms namely solid, liquid and vapor. Ice bergs and ice caps in solid and oceans, sea, lake and rivers are liquid forms of water. It is found in air as gaseous form.

Water is available in two forms Salty water and Fresh water. Fresh water is used for daily purpose. Totally 3% of available water in earth is fresh water. Fresh water is available in various sources like glaciers, Ground water and Surface water and other sources.

Ocean and sea water are dissolved with huge amount of salts and minerals. This is called as saline water which is not suitable for human consumption.

Water is chemical substance with two hydrogen atom and one oxygen atom. Basically water is transparent, tasteless and odorless substance. The physical composition of water changes from place to place.

The amount of salt in water is termed as salinity. Based on its salinity water is classified into three main categories such as freshwater, brackish water and sea water.

Ocean water is composed of many substances. The salts include sodium chloride, magnesium chloride and calcium chloride.

Water freezes at 0o Celsius at normal pressure. The boiling point of water is 100 deg Celsius.

The Common salt and copper sulphate dissolve in water and contribute their properties like color and other properties to water but sand, chalk powder and charcoal powder do not dissolve in water.

Water cycle is a continuous process which involves three major steps. It is a natural process by which water gets renewed and the other name of water cycle is Hydrological cycle.

The amount of salt in water is termed as salinity. Based on salinity water is classified into three main categories as Fresh water, Brackish water and Sea water.
Fresh water contains 0.05% to 1% of salt. Brackish water contains upto 3% of salt and seawater contains more than 3% of salt

The physical composition of water changes from place to place. It can be clear or cloudy, oxygenated or not very oxygenated and it can be fresh or salty. The amount of salt in water is termed as salinity.

Water obtained from ponds, rivers, wells are classified as Fresh Water which is used for human consumption. These are naturally available as Glaciers, Ground water and Surface water.

Rain water is considered as the purest form of water. But it contains some impurities and particles present in atmosphere. These supplies may need to be filtered to ensure it for human consumption.

The water on earth evaporates into atmosphere due to the heat of Sun. These Vapors forms clouds by which water reaches earth by rain or snow.

The Total fresh water of earth is distributed among various forms like Glaciers, Ground water, Surface water. In that 68.7% of total fresh water is available from polar ice caps and glaciers.

Water cycle is a continuous process. It involves three stages- Evaporation, Condensation and Precipitation.

Transpiration is the process of loss of water from the aerial parts of plants in vapor form. Water evaporates from Lakes, rivers, Rain water and also from polar ice caps.

Three types of natural sources of fresh water are available on earth. They are from Surface water, frozen water and Ground water.

Water present on the surface of the earth such as river, lake, ponds, streams or fresh water wetland is called surface water.

Water present in frozen form as polar ice-caps and glaciers are called as frozen water. About 68.7% of the total available fresh water is in frozen state.

Water levels in reservoirs are measured in TMC/feet. Water released from dams is measured in cusec (cubic feet/sec).

Water is measured in liter and milliliter. Gallon is also a measure of volume of liquids. 1Gallon = 3.785 liter.

During winter season water in lakes and ponds in cold countries will be frozen and a solid layer of ice is formed on the surface of water. This layer does not permit heat to escape from water which is the reason for the existence of aquatic animals under the ice layer.

The Total quantity of water available in earth is not changed. But the useful water which is essential for mankind and plants is decreasing day by day. This is known as water scarcity.

The only method of preventing water scarcity is Conservation of water. Or else it is impossible for organisms to live on the earth.

Rain water harvesting is a methodology to collect the water from rainfall area and where it flows.

Estuaries are wetlands where a water body meets the sea. It is the combination of fresh water from land meets the salty sea water.

Human body uses water for all its cells, Organs and tissues to regulate its temperature and other functions. Averagely human body requires 2-3 liters of water per day for proper functioning.

Swamps are wetlands that occur along large river or on the shores of lakes. Swamps are important for fresh water and oxygen to all life. It is spread across various parts of India.

Water is essential for healthy growth of farm crops and farm stock. But minimizing the use of chemical fertilizers in agriculture reduces the pollution of underground water.

Swamps are forested wetlands. The water of swamp may be freshwater, brackish water or sea water.

Sea water is distributed after passing through a treatment system which converts sea water to consumable fresh water. In this process water is filtered through sand filtration method and then sends to disinfection stage. This process removes the microorganisms present in it. Disinfection is done with chlorine and ammonia.

Lavoisier (1743-1794) conducted various experiments to conclude that air is a mixture it is not a basic element. Likewise he also proved that water is made up of oxygen and hydrogen.

Several systems and methodologies are practiced to distribute the water in all level. Huge quantity of water is saved in reservoirs and dams to regulate the water supply and for proper distribution.

The Total fresh water is available mainly in the form of ice bergs and glaciers. The Himalayas contain ice caps and glaciers from which most of the Asian rivers originates.

There are two methods followed for the conservation of water. One of the most important method is Rain water harvesting. In that two types of rain water harvesting is done (a) Collecting water from where it falls. (b) Collecting flowing rain water.

Water is most important component for all human beings, animals and plants. Water is available in various forms naturally. 97% of the total water on earth is found in seas and oceans.

Lavoisier is a pioneer in the revolution of chemistry. He published the book “Elements of Chemistry“ in the year 1789 which was the foundation of Modern Chemistry.

Every year march 22nd is observed as the world water day.

Industry depends on water at all levels of production. It is used as a material, a solvent and for generating electricity.

Our body uses water in all its cells, organs and tissues to help regulate its temperature and maintain other bodily functions. On an average, the human body requires 2 – 3 liters of water per day for proper functioning. Water helps in digestion of food and removal of toxins from the body.

The moisture in the soil indicates the presence of underground water.

The Himalayas contain ice caps, ice bergs and glaciers. Ten of Asia’s largest rivers flow from the Himalayas and more than a billion people’s livelihoods depend on those rivers.