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 can exist naturally in all three states of matter: solid (ice), liquid (water), and gas (water vapor or steam). This ability to change states is due to the temperatures and pressures present in different parts of the Earth.

Water is valuable to industries because it is a universal solvent, meaning it can dissolve many substances. This makes it essential in processes like cleaning, mixing, and transporting materials in various industries, such as manufacturing, pharmaceuticals, and food production.

Filtration is the process where a liquid passes through filter paper to separate solid particles from it. The filter paper allows the liquid to pass through while trapping the solid particles, making it useful for purifying liquids or separating mixtures.

Distilled water is obtained by the process of distillation, where water is boiled to produce steam, and then the steam is cooled and condensed back into liquid form. This process removes impurities and dissolved substances, leaving behind pure water.

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.

Each of these objects can help save water:

• A bucket can be used to collect water while adjusting the tap temperature, which can then be reused for other purposes like watering plants.
• A clock can help limit shower time, reducing unnecessary water usage.
• A broom can be used instead of a hose to clean outdoor areas, preventing the wastage of water.