Important Questions Test: Water A Precious Resource - Class 7 MCQ

A tube well is a type of water well in which a long, 100–200 millimetres (3.9–7.9 in)-wide, stainless steel tube or pipe is bored into an underground aquifer. The required depth of the well depends on the depth of the water table. Tubewell is largely used in desert areas where the ground water level is very deep.
Springs are indicated by locations or points on the ground surface, where water from beneath the ground emerges on to the surface. A common example is of an overflowing unconfined aquifer. Springs can be perennial or seasonal. Discharge from a spring may vary between from a trickle to about 100 cum per second.
 

Cutting trees to check water loss due to transpiration is not help in conservation of water. For conversation of water we use drip irrigation, planting more trees, water treatment plant and many more methods.

71% of the Earth's surface is covered with water.

The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called infiltration. The groundwater thus gets recharged by this process.

(d) According to the recommendation of United Nations (UN) minimum 50 litres of water per person per day should be provided. Hence, three buckets (nearly 60 litres) of water is sufficient for a person for one day.

Some 72 percent of Earth is covered in water, but 97 percent of that is salty ocean water and not suitable for drinking.The rest are in the form of lakes ,etc.So the percentage remaining available for us is 0.006 %

Snow and ice are frozen while water vapour is in gaseous state. Water from lake and river are in liquid state.

The upper limit of the layer where water is present between particles of soil and gaps between rocks is called water table and water below this layer is called groundwater.

Among the given options, drip irrigation is a way to use water economically because the installation of drip irrigation techniques require less amount of water.

22 March is celebrated as the World Water Day.

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 litres per person per day.

Every drop of water is slogan related to importance of water

Water cycle does not involve rainwater harvesting. Rainwater harvesting involves recharging the groundwater.

 A pukka or cemented floor is usually impervious to water, inhibiting the seepage of rainwater into grounds.