Test: The World of Things - Class 3 MCQ

Transparent materials allow light to pass through them clearly, which means you can see through them easily. For example, glass windows are transparent because you can clearly see what’s on the other side. Opaque materials, on the other hand, block light, so you cannot see through them. Flexible materials can bend without breaking, and rigid materials are stiff and cannot bend easily.

Solids are materials that maintain their shape and do not flow. Examples include wood and metal. Their particles are closely packed together, giving them a fixed shape and volume.

Translucent materials allow some light to pass through them, but not clearly. Examples include frosted glass and thin plastic. They scatter the light passing through them, making objects on the other side appear blurred.

Liquids are materials that take the shape of their container and flow. Water and milk are common examples of liquids. They do not have a fixed shape but instead conform to the shape of the container they are in.

Natural materials occur naturally in the environment, like wood from trees, metals extracted from ores, or water from rivers. Artificial materials, on the other hand, are created by humans, like plastic, rubber, and synthetic fabrics. The transparency, rigidity, flexibility, or ability to flow does not define whether a material is natural or artificial.

Flexible materials can be bent easily without breaking. For example, rubber and fabric are flexible because they can bend or stretch without snapping. Rigid materials, like wood or metal, are stiff and do not bend easily. Opaque and translucent refer to how much light passes through a material, not its ability to bend.

Opaque materials do not allow light to pass through them, making them impossible to see through. Wood and metal are common examples of opaque materials due to their dense structure that blocks light transmission.

Liquids are materials that take the shape of their container and flow. This property allows them to adapt to the space they occupy, making them versatile for various applications such as drinking, cooking, and cleaning.

Rigid materials are stiff and do not bend easily. For example, metal and wood are rigid because they maintain their shape and cannot be easily bent. The other options describe different characteristics: flexible materials can bend, liquids flow and fill containers, and transparency refers to how much light can pass through a material.

Gases are materials that spread out and fill the space they are in. Air and helium are common examples of gases. Their particles move freely, allowing them to occupy the entire volume of a container they are in.