Materials Around Us
Fill in the Blanks
1. Objects are made up of different types of _______.
Answer: materials
2. The process of grouping objects based on their properties is called _______.
Answer: classification
3. Materials that allow light to pass through clearly are called _______.
Answer: transparent
4. _______ materials have a shiny surface, like metals.
Answer: Lustrous
5. Materials that do not dissolve in water are called _______.
Answer: insoluble
6. A material that is soft and easily compressible is called _______.
Answer: soft
7. Any substance that occupies space and has mass is called _______.
Answer: matter
8. The property that describes how much space an object occupies is called _______.
Answer: volume
9. Materials through which we cannot see are called _______.
Answer: opaque
10. Water is an example of a _______ material.
Answer: transparent
True or False
1. Wood is a transparent material.
Answer: False (Wood is opaque)
2. Metals like iron and copper are examples of lustrous materials.
Answer: True
3. Soluble materials dissolve in water.
Answer: True
4. Opaque materials allow light to pass through them.
Answer: False (Opaque materials block light)
5. All objects are made from a single material.
Answer: False (Objects can be made from multiple materials)
6. Glass is an example of a translucent material.
Answer: False (Glass is transparent)
7. Sand is an insoluble material.
Answer: True
8. Mass is the quantity of matter in an object.
Answer: True
9. Chalk is a soft material.
Answer: True
10. Paper is a lustrous material.
Answer: False (Paper is non-lustrous)
Question / Answer
1. What are materials? Provide examples of different materials.
Answer:
A material is any substance used to create objects. Examples of materials include:
- Paper (used to make notebooks)
- Plastic (used to make pens, bottles)
- Metal (used to make utensils, tools)
- Glass (used to make windows, bottles)
2. What is classification? How can objects be classified based on their properties?
Answer:
Classification is the method of arranging objects into groups based on common properties. Objects can be classified by:
- Shape (e.g., round, square)
- Color (e.g., red, blue)
- Hardness (e.g., soft like rubber, hard like stone)
- Transparency (e.g., transparent like glass, opaque like wood)
3. Differentiate between lustrous and non-lustrous materials with examples.
Answer:
- Lustrous Materials: These materials have a shiny surface, such as metals like iron, copper, and gold.
- Non-lustrous Materials: These materials do not shine, such as wood, rubber, and paper.
4. Explain the difference between transparent, translucent, and opaque materials with examples.
Answer:
- Transparent Materials: Objects that allow light to pass through clearly, like glass and water.
- Translucent Materials: Objects that allow some light to pass but are not clear, like frosted glass or butter paper.
- Opaque Materials: Objects that do not allow light to pass through, like wood or metals.
5. What is solubility? Give examples of materials that are soluble and insoluble in water.
Answer: Solubility is the ability of a material to dissolve in water.
- Soluble Materials: Sugar, salt
- Insoluble Materials: Sand, chalk powder
6. Why do we classify materials?
Answer: We classify materials to organize and study their properties. Grouping materials helps us understand how they behave and how they can be used for different purposes.
7. What is the difference between hard and soft materials? Give examples.
Answer:
- Hard Materials: These materials are difficult to compress or scratch, like stone and iron.
- Soft Materials: These materials can be easily compressed or scratched, like rubber and erasers.
8. What is mass and how is it measured?
Answer: Mass is the quantity of matter in an object, and it is measured in grams (g) or kilograms (kg). Heavier objects have more mass, and lighter objects have less mass.
9. What is the importance of volume? How is it measured?
Answer: Volume is the amount of space an object or substance occupies. It is measured in liters (L) or milliliters (mL). For example, a bottle of water may have a volume of 500 mL.
10. How do transparent materials differ from opaque materials in everyday use?
Answer: Transparent materials, like glass, are used for windows so we can see through them. Opaque materials, like wood, are used for doors to block visibility.
11. Why are some materials used for specific purposes? Give an example.
Answer: Materials are chosen based on their properties. For example, metal is used to make cooking utensils because it is durable and can withstand heat, while paper cannot.
12. Describe an activity that helps you explore which materials are soluble in water.
Answer: Take five glass tumblers filled with water. Add a teaspoon of sugar in the first, salt in the second, chalk powder in the third, sand in the fourth, and sawdust in the fifth. Stir each mixture and observe which materials dissolve (soluble) and which do not (insoluble).
13. What is matter?
Answer: Matter is anything that occupies space and has mass. Examples of matter include water, sand, and air.
14. What are some common properties that help classify materials?
Answer: Common properties include:
- Hardness (hard or soft)
- Appearance (lustrous or non-lustrous)
- Transparency (transparent, translucent, opaque)
- Solubility (soluble or insoluble)
15. How does the invention of plastic impact human life?
Answer: The invention of plastic has made everyday life more convenient as it is used for packaging, making household items, and more. However, it has also caused environmental problems due to its non-biodegradable nature.
A chalk is not a soft material chalk is hard material
In my opinion it is obvious. You did not try to look in google.com?