Olympiad Test : Water - 1 - Class 5 MCQ

The Earth's surface is predominantly covered by water, approximately 71%. This includes oceans, seas, lakes, and rivers. It's essential for sustaining life on the planet.

Water is known as the universal solvent because it has the ability to dissolve a wide variety of substances. This property makes it crucial for various biological and chemical processes.

Water is unique as it can exist in all three states of matter – solid (ice), liquid (water), and gas (water vapor) – under normal conditions on Earth.

The primary reason water is valuable to industries is: It is a universal solvent.

Filtration involves passing liquid through a filter paper to separate solid impurities, as seen in the process of water purification.

Distilled water is obtained through the process of distillation, where water vapor is condensed back into liquid form after being heated.

Boiling water for about 10 minutes is a simple and effective method to kill germs and purify drinking water at home.

Chlorination involves adding chlorine to water, which effectively kills germs, making the water safe for consumption. Chlorine tablets are commonly used for this purpose.

Alum is added to water to increase the rate of sedimentation by making impurities heavier and aiding in their removal.

Approximately 71% of the Earth's surface is covered by water, including oceans, seas, lakes, and rivers. Water is essential for all living things.