Test: Materials Around Us - Class 6 MCQ

Wood is a natural material because it comes from trees, which are part of nature. It is used to make furniture, paper, and other items. Plastic, glass, and metal are all man-made materials, not natural.

Glass is commonly used for making windows because it is transparent, meaning we can see through it clearly. This allows light to pass into a room while still protecting us from the outside elements. Wood, metal, and cloth do not allow us to see through them like glass does.

Wood is an opaque material, meaning it does not allow light to pass through, so you cannot see through it. Frosted glass, clear plastic, and transparent glass are all materials that allow light to pass through, making them either translucent or transparent.

Sugar is soluble in water, meaning it dissolves completely when mixed with water. Sand, chalk, and clay do not dissolve in water; instead, they remain separate and do not form a solution.

Mass is the measure of the amount of matter in an object. It tells us how much material is in an object and is usually measured in grams or kilograms. Volume refers to the space an object occupies, and weight is the force exerted by gravity on an object.

Transparency refers to how clearly we can see through a material. Materials like glass and water are transparent because they allow light to pass through clearly. Hardness, solubility, and volume are not related to how clearly we can see through a material.

Translucent materials let light pass through, but the view is blurred. You can't see clear images through them, like with butter paper or frosted glass.

The SI (International System of Units) unit of mass is the kilogram (kg). While the gram is also used to measure mass, the kilogram is the standard unit. 1 kilogram equals 1000 grams. Liter measures volume, and kilometer measures distance, so they are not units of mass.

Volume refers to the amount of space an object occupies, and is usually measured in liters (L) or milliliters (mL) for liquids.

- Rubber is a flexible and elastic material, making it softer than iron, which is a hard and rigid metal.
- Sponge, though it can be very soft and compressible, is generally softer than both rubber and iron.
- Iron is the hardest among these materials, known for its strength and rigidity.
- Therefore, the correct statement is A: Rubber is harder than sponge but softer than iron.