Test: Water - Class 6 MCQ

Rainwater is absorbed into the ground, which refills the groundwater reservoirs. This groundwater is crucial for sustaining wells, springs, and other sources of fresh water. Interestingly, only a small fraction of rainwater directly contributes to lakes, ponds, rivers, or seas.

The water cycle involves the continuous movement of water between the atmosphere, land, and oceans. It encompasses processes like evaporation, condensation, precipitation, and runoff, creating a continuous circulation of water across the Earth's surface.

When the water level in rivers increases significantly, it can exceed the river's capacity, causing the surrounding areas to flood. Floods can have devastating effects on communities, agriculture, and infrastructure.

The presence of water droplets around a glass of ice indicates that moisture in the air has condensed on the cold surface of the glass due to the temperature difference, forming these droplets.

Generally, seawater contains high levels of salt, making it unsuitable for drinking without undergoing desalination processes. Wells, rivers, and lakes are conventional sources of potable water.

Wet clothes dry as the water on their surface evaporates into the air due to the Sun's heat, turning the liquid water into vapor.

Evaporation is a process where water changes from liquid to vapor, moving water from bodies of water like rivers and lakes into the atmosphere. It does not directly replenish these sources.

Condensation of water vapor forms clouds, and when these droplets become heavy enough, they fall to the ground as precipitation, commonly known as rain.

The formation of fog involves condensation, where water vapor in the air cools and turns into tiny water droplets. Similarly, the blackboard drying after wiping is due to the evaporation of the moisture left on the board.

Rainwater harvesting involves collecting and storing rainwater for various purposes such as irrigation, drinking, and recharging groundwater. This sustainable practice helps in conserving water resources.