This is the most important part of any chapter. By solving extra questions of sorting materials into group class 6, you can easily get success in school exams as well as other exams in life. Extra questions play a very important role in deep study and taking advantage of other students. It’s gives you extra knowledge with simple, easy concepts. Now let’s start sorting materials into groups Class 6 extra questions answers:

Q.1: Explain what the lustre properties of materials are.

Ans. There are some materials that look very shiny. According to their lustre nature, we put it in a lustre category. Approximately all matels have a lustre nature. When we cut steel and aluminum in sheets, we found they have a shine property on every cutting sheet. But there are some materials, like silver, that lost their shine according to time and atmospheric conditions.

Q.2: Explain what the hardness properties of materials are.

Ans. We can feel which materials are soft or hard by touch and other activities. We can easily press some materials, and they change their positions, but some are very hard; they can’t press and don’t change their structure. There are two types of categories in hardness property:

1. Hard: These are those materials that do not press easily and cannot change their shape when pressure is applied. Iron or wood is an example of it.
2. Soft: These are those materials that are easy to compress, and they can change their shape by compressing. Clothes are an example of it.

Q.3: Explain what the soluble properties of materials are.

Ans. This property is all about the dissolving capacity of a material. We observe there are many materials that can dissolve easily in water, and some are not.

1. Soluble: Those materials that dissolve in water are in the soluble category. Sugar and salt are examples of soluble.
2. Insoluble: Those materials are not dissolved in water. Iron, wood, and clothes are examples of insoluble.

Q.4: Explain what the transparency properties of materials are.

Ans. We can classify the materials according to their transparency property. There are some materials that are transparent (we can see easily across from the materials on both sides) but are not like this. This type of material has three types of materials:

1. Transparent: These are those materials that can allow the light to pass through themselves, and we can easily see it from both sides of it.
2. Translucent: These are those materials that can allow the light to pass, but on a limited scale, and we will not be able to see clearly across from them.
3. Opaque: These are those materials that do not allow the light to pass through them and are not able to see across them.

Q.5: Explain what the ductile and malleability properties of materials are.

Ans. Ductile: These are those materials that can change their shape (like wire) easily by applying force. Gold is the best ductile metal.

Malleability: These are those materials that can cut or change into sheets without breaking. They are called malleable materials. If those materials breakdown when we change into a sheet, then it is called brittle.