Test: Solids, Liquids & Gases - 1 - Class 5 MCQ

Evaporation is the process of changing a liquid into a gas on heating.

Energy is not a state of matter but a property of matter.

Burning of wood is a chemical change as it results in the formation of new substances like ash and gases, and cannot be reversed.

• Gases can expand and fill any space because they are packed very loosely, giving them lots of space to move freely.
• This means that gases can spread out to fit wherever they are put without any difficulty.
• So, when you see a balloon getting bigger and bigger, it's because the gas inside it is spreading out to take up all the space it can find.

In simple words: In solids, molecules are tightly packed together, not allowing them to move freely. This closeness gives solids their definite shape and volume.

• Ice cubes float in a tumbler of soft drinks because they are lighter than water.
• This happens because ice is a special kind of solid that is less dense than liquid water.
• When water freezes into ice, it expands and becomes less heavy, making it float on top of the liquid water.
• So, when you see ice cubes floating in your drink, it's because ice is lighter than the liquid it's in.

Melting is the process of changing a solid into a liquid on heating.

• When you open a bottle of a fizzy drink like cola, the bubbles that come out are not water vapor bubbles. They are bubbles of carbon dioxide gas. So, the correct answer is False.
• Fun Fact: Fizzy drinks are a solution of the gas carbon dioxide in water, which gives them their bubbly nature!

Rusting of iron is a chemical change because it involves a reaction between iron and oxygen, resulting in the formation of a new substance (iron oxide).

• Atoms are like the tiniest building blocks of everything around us.
• Just like how Lego blocks help us build fun things, atoms are like the Lego blocks of matter, which is everything that has mass and takes up space.
• So, atoms are the smallest units of matter that make up everything we see and touch.