Test: A Journey through States of Water - Class 6 MCQ

Ice is the solid form of water. When water freezes, it turns into ice, which is hard and keeps its shape. Unlike liquid water, which flows and takes the shape of its container, ice does not flow and maintains its own fixed shape​.

Evaporation is the process where liquid water changes into water vapour (gas). This happens when water gets heated, like when clothes dry in the sun or when water in a pan turns into steam.

Water vapour is the gaseous form of water, and it is invisible. While it’s present in the air around us, we can’t see it unless it condenses into tiny droplets, forming steam or clouds​.

During condensation, water vapour (gas) loses heat and changes back into liquid water. This is why we see water droplets on the outside of a cold glass or in the formation of clouds​.

When air moves faster, it helps to carry away the humid air above the surface, allowing more water to evaporate quickly. This is why clothes dry faster on a windy day.

When we sweat, the water in the sweat evaporates from our skin, taking away heat and making our body feel cooler. This is an example of the cooling effect of evaporation​.

When water freezes, it changes from its liquid form to solid ice. This happens when the temperature drops below 0°C, causing the water molecules to arrange themselves into a structured form, making ice rigid and solid​.

Clouds form when water vapour in the air cools down and condenses into tiny water droplets. These droplets gather together to form clouds​.

On a windy day, the moving air helps to carry away the moisture (water vapour) from the clothes, allowing more water to evaporate quickly. This makes clothes dry faster compared to when there is no wind​.

When warm, moist air comes into contact with a cold glass, the water vapour in the air cools down and changes into liquid water, forming droplets on the surface of the glass. This process is called condensation​.