Chapter 6: Materials Around Us
Comprehensive Exercise (Made for exam preparation)
Class 6 Science
Question 1: Choose the correct option (Multiple Choice Questions):
1. Which of the following materials allows you to see through it clearly?
Answer: (B) Transparent.
2. What is the method of arranging objects into groups based on their properties called?
Answer: (C) Classification.
3. Which of the following is an example of a translucent material?
Answer: (C) Butter paper.
4. Anything that occupies space and has mass is called:
Answer: (C) Matter.
5. Which of the following materials is generally considered to have 'lustre' (shine)?
Answer: (C) Copper.
Question 2: Fill in the blanks with the appropriate words:
- 1. Any substance that is used to create an object is referred to as a material.
- 2. A tumbler used to hold water cannot be made of cloth because it cannot hold liquids.
- 3. Materials that completely dissolve in water, like glucose or sugar, are called soluble in water.
- 4. The space occupied by matter is called its volume.
- 5. Air does not hinder us from seeing each other, which means air is transparent.
Question 3: State whether the following statements are True or False:
- 1. An object can be made up of a combination of different materials.
Answer: True. - 2. Wood and plastic are examples of lustrous (shiny) materials.
Answer: False (They are non-lustrous). - 3. We group materials because it helps us to study and observe patterns in their properties.
Answer: True. - 4. Frosted glass is an opaque material.
Answer: False (It is translucent). - 5. Mass quantifies the amount of matter present in an object.
Answer: True.
Question 4: Match the items in Column 'A' with the correct items in Column 'B':
| Column 'A' | Column 'B' |
|---|---|
| 1. Transparent | (a) Mustard oil |
| 2. Opaque | (b) Glass tumbler |
| 3. Translucent | (c) Wooden door |
| 4. Soluble in water | (d) Glucose |
| 5. Insoluble in water | (e) Frosted glass |
Correct Matches:
- 1 → (b) Glass tumbler
- 2 → (c) Wooden door
- 3 → (e) Frosted glass
- 4 → (d) Glucose
- 5 → (a) Mustard oil
Question 5: Classification. Classify the following 5 materials into "Transparent", "Translucent", and "Opaque":
Items: 1. Clear glass, 2. Cardboard piece, 3. Butter paper, 4. Iron plate, 5. Air.
- Transparent: 1. Clear glass, 5. Air.
- Translucent: 3. Butter paper.
- Opaque: 2. Cardboard piece, 4. Iron plate.
Question 6: Answer the following questions in one sentence:
1. What do you mean by the term 'Material'?
Answer: Any substance that is used to create an object is referred to as a material.
2. Why do we classify or group objects?
Answer: We classify objects to easily locate them, and to study and observe patterns in their properties.
3. What are translucent materials?
Answer: The materials through which objects can be seen, but not clearly, are known as translucent materials.
4. Give an example of a single object that can be made from different materials.
Answer: A tumbler can be made from different materials like plastic, glass, or metal.
5. Define 'Matter'.
Answer: Anything that occupies space (volume) and has mass is called matter.
Question 7: Give scientific reasons:
1. Reason: We cannot make a tumbler out of a piece of cloth.
Answer: Because the material used to make a tumbler must be capable of holding water, and a piece of cloth allows water to pass through it.
2. Reason: A grocer keeps all types of spices in one corner and pulses in another.
Answer: Because grouping or classifying objects based on similar properties makes it systematic, easier, and faster to locate them when needed.
3. Reason: A wooden door is considered an opaque object.
Answer: Because light cannot pass through a wooden door, and it completely hinders us from seeing anything on the other side.
4. Reason: Metals like iron and copper are grouped differently from wood or plastic.
Answer: Because metals like iron and copper possess a shiny appearance known as 'lustre' and are generally hard, whereas wood and plastic are non-lustrous.
5. Reason: Water, sand, and pebbles are all considered as 'matter'.
Answer: Because all these things, despite being in different forms, occupy space (have volume) and have a certain mass.
Question 8: Answer the following questions in short (2-3 sentences):
1. How do you decide whether a material is soluble or insoluble in water?
Answer: We take a small amount of the material and mix it well in a glass of water. If the material completely disappears or mixes into the water (like glucose), it is soluble; if it does not mix (like oil), it is insoluble.
2. What is the difference between transparent and translucent materials?
Answer: Transparent materials (like clear glass or air) allow you to see through them clearly. Translucent materials (like butter paper or frosted glass) allow you to see through them, but not clearly.
3. Mention any four properties used for grouping materials.
Answer: Materials can be grouped based on properties such as appearance (lustre/dullness), feel (hard/soft), transparency (transparent/translucent/opaque), and solubility in water.
4. Can an object be made of a combination of different materials? Give an example.
Answer: Yes, an object can be made from a combination of different materials. For example, a pair of scissors is made of metal (for cutting) and plastic (for the handles).
5. What are the two essential characteristics of 'Matter'?
Answer: The two essential characteristics of matter are that it has mass (which quantifies the amount of matter) and it occupies space (which is called its volume).