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A solid, ‘natural form of water.

Snow

A chemical used during chlorination of water.  

Chlorine.

There are mainly two methods followed by us to conserve the water. 

1. Water management 

2. Rainwater harvesting 

1. Water management: 

Water management consists of the following factors. 

a) Bringing awareness about the bad effects of throwing wastes into the water bodies 

b) Recycling of water by separating pollutants. 

c) Minimizing the use of chemical fertilizers in agriculture. It reduces the pollution of underground water. 

d) Controlling deforestation. 

e) Adopting drip irrigation and sprinkler irrigation in agriculture. In this way, a lesser amount of water can be used for irrigation.

Taking steps to ensure that rainwater will be available even in the period after the rainy season is called water management.

Materials required : 

1. beaker 

2. glass rod 

3. washing soda 

4. hard water 

Take some hard water in a beaker, and add a small quantity of washing soda to it stir it with a glass rod. Allow the insoluble carbonates to settle down or precipitate. Filter or decant the liquid. Water so obtained is soft water. But it is unfit for drinking as it contains an excess of washing soda and excess of sodium salts.

A) Adopting drip irrigation and sprinkler irrigation

(i) Toxins

(ii) Litres

(iii) Juicy fruits

(iv) Cucumber

(v) 3%

(vi) Freshwater

(i)  Heated

(ii) Heat

(iii) Condensation

(iv) Colder air

(v) Hailstones

(i) June-September

(ii) Nov-Dec

(iii) Water cycle

(iv) National Disaster Relief Force

(v) State Disaster Relief Force

(a) False

(b) False

(c) True

(d) False

(e) True.

(a) condensation

(b) evaporation

(c) condensation

(d) evaporation

(e) evaporation

• The outside wiper of a vehicle wipes off the rainwater. 
• The coolness of the rain causes condensation of natural moisture on the inner surface of the glass. 
• Due to this condensation of moisture, it makes invisibility to the driver, to drive 
• To maintain the visibility through the glass the driver wipes off the glass manually.

i) We observed the formation of small drops of water on the outer surface of the glass.

ii) The water vapour which surrounds the glass gets condensed due to the low temperature of the glass outer surface.

iii) No. It does not form any water drops if there is no ice in the glass.

• Why the image in the mirror was not clear when I blow air onto the mirror? 
• Which process is responsible for this? 
• Does this happen in all seasons? 
• In which atmospheric conditions it happens frequently?

The water vapour which enters into the air through the process of evaporation forms clouds in the sky.

The water is heated by sunlight, it gets converted to vapour and mixes with the air.

The water in the wet clothes dry up not only due to sunlight but also wind.

The places where the ground water is stored between layers of hard rock below the water table is known as an aquifer.

• Water is the basic need of living organisms to survive.
• Water cycle is responsible for rainfall and it contributes healthy growth of crops. 
• Water cycle maintains the ecological balance of earth. 
• Water cycle maintains the temperature of the earth constant. 
• Water is a habitat for so many plants and animals.

If people are suffering due to severe floods, I will help them by following the ways.

• By providing food. 
• By providing the drinking water. 
• By providing blankets, clothing to them. 
• By providing the basic needs related to sanitary hygiene and medicines. 
• By providing shelter. 
• By approaching individual charity institutions and non-govt, organisations to take their help.

• Turn off taps quickly after use. 
• Reuse water directly from other sources like collected rainwater. 
• Switch off the water pumping motor in time to save water. 
• Check all pipes and toilets for leaks and other purposes. 
• Drinking water should not be used for other purposes. 
• Recycle the water by separating the pollutants. 
• Follow the water management techniques such as rainwater harvesting.

Water with a large amount of dissolved solids is not potable or suitable for drinking. Such water is called saline water.

Correct option is B) Chlorine

Correct option is D) all of these

Shampoo, soap, washing detergents, waste food particles, oil and grease from washed utensils, dirt and grime from soiled colthes.

• Water that comes from rainfall runs down as small streams. 
• These small streams join together and make bigger streams. 
• These bigger streams join the rivers. 
• The rivers flow down to seas and oceans. 
• Some of the rain water seeps into the ground and becomes ground water.

The people of western Rajasthan learned to conserve every drop of water from honey bees. They also have a folk sing meaning, if the honeybees can make honey by collecting nectar from different flowers can’t we humans save water by collecting rainwater.

Fluoride rich water is found in Rajasthan’s Shekhawati region and in Southern Rajasthan. Using this water for drinking purpose can lead to bone-related diseases

1. evaporation

2. Hydrological cycle

3. drought

4. floods.

Deforestation and pollution from factories are now causing global warming.

Global warming disturbs the water cycle and causes either less rainfall or too much rainfall.

The strong gravitational pull exerted by the sun and the moon on the earth’s surface causes tides.

The rhythmic rise and fall of ocean water twice a day is called a tide. Tides are caused due to the gravitational pull exerted by the sun and the moon on the earth's surface.

The amount of usable water on earth is limited, so it needs to be used carefully

The only method of preventing scarcity of water is conservation of water.

Water sources are natural resources of water that are useful for different activities such as agricultural, industrial and household etc.