Olympiad Test: Water - Class 6 MCQ

The inland lakes depend on rains or the water table (ground water).

Rain water is the source of ground water.

When water boils, there will be a change in its temperature and state.

Clouds are formed due to evaporation and condensation.

The water table of that place becomes lower.

Cloud seeding is an artificial method of introducing particles in clouds to cause rains by initiating condensation of water vapour present in the clouds.

Container S (a flask) has the smallest surface area of water exposed to the atmosphere. Thus, the rate of evaporation will be the slowest in flask S.

Rain water forms the primary source of water on the land.

Water which is fit for drinking is called potable water.

Due to the sunrays, the water vapour present in the atmosphere condenses to form dew drops which fall on the blades of grass, leaves of plants etc., during early winter mornings.

Water is useful to life on the earth. To maintain ecological balance, for sustaining life and it is also necessary for respiration in aquatic organisms.

A lot of salt deposits are present in our earth's crust. They are carried by rain water in dissolved form and increase the salinity of seas slowly over the time.

Rain water is collected in a special type of arrangement. This water is used which in turn helps to raise the water table of a place.

Ground water gets recharged by the process of infiltration.

The process of water cycle is shown in the given figure.

During summer, water, from our body as sweat. Evaporation causes cooling because water droplets present on the skin require some heat to evaporate, which they take from the body.

Sea water contains a lot of dissolved salts and when the evaporation of the sea water occurs, these salts are left behind.

• Water table levels can lower due to several factors, with drought being a significant one. During a drought, there is less rainfall, meaning less water seeps into the ground.
• When trees are planted, they absorb water, potentially lowering the water table if not compensated by rainfall.
• In contrast, cyclones and floods usually increase water levels temporarily rather than decrease them.

The amount of potable water is decreasing because of over usage. Water scarcity is the lack of sufficient available water resources to meet the demands of water usage within a region.

Answer:
b) Increased soil fertility due to nutrient-rich floodwaters
Floods typically cause soil erosion rather than increasing soil fertility. The force of floodwaters often washes away the topsoil, removing valuable nutrients and reducing the fertility of the land. Other consequences of floods include crop loss, waterlogging (which can lead to disease outbreaks), and damage to infrastructure.