Q1: What is a material?
A material is any substance that is used to create an object, such as wood, metal, plastic, or glass.
Q2: In the context of materials, what does the term 'soluble in water' mean?
In the context of materials, 'soluble in water' means that a material can dissolve completely when mixed with water. This means the material disappears and forms a solution with the water, so you can no longer see the individual particles of the material. For example, when salt is added to water, it dissolves, making a saltwater solution.
Q3: Define the term 'lustrous.'
Lustrous refers to materials that have a shiny surface, like metals such as iron, copper, and gold.
Q4: What is the significance of classifying materials based on their properties?
Classifying materials based on their properties helps in understanding their uses, similarities, and differences, which makes it easier to study and utilize them effectively.
Q5: Name two materials that are commonly used for making transparent objects.
Glass and clear plastic
Q6: Why can’t a tumbler made of cloth be used to store water?
A tumbler made of cloth cannot be used to store water because cloth is not waterproof and will allow the water to seep through.
Q7: What is an opaque material? Provide an example.
An opaque material is one through which you cannot see at all. An example is wood.
Q9: What is the difference between transparent and translucent materials?
Transparent materials allow light to pass through them clearly, making objects behind them visible, while translucent materials allow some light to pass through, but objects are not seen clearly.
Q10: What happens when sugar is mixed with water?
When sugar is mixed with water, it dissolves completely, making the solution clear.
Q1: Which of the following materials is non-lustrous?
a) Gold
b) Copper
c) Paper
d) Iron
Ans: c) Paper
Paper does not have a shiny surface, making it a non-lustrous material.
Q2: Which of the following materials can be compressed easily?
a) Stone
b) Rubber
c) Iron
d) Wood
Ans: b) Rubber
Rubber is a soft material and can be easily compressed compared to harder materials like stone or iron.
Q3: Which of these materials is soluble in water?
a) Sand
b) Salt
c) Chalk powder
d) Sawdust
Ans: b) Salt
Salt dissolves completely in water, making it soluble.
Q4: What type of material is butter paper?
a) Transparent
b) Opaque
c) Translucent
d) Lustrous
Ans: c) Translucent
Butter paper allows some light to pass through, but objects behind it cannot be seen clearly, making it translucent.
Q5: Which material is typically used to make objects like cooking utensils due to its ability to withstand high temperatures?
a) Plastic
b) Paper
c) Metal
d) Cloth
Ans: c) Metal
Metals like steel are used for cooking utensils as they can withstand high temperatures without melting or burning.
Q6: Which of the following objects would be best categorized as opaque?
a) Clear glass
b) Frosted glass
c) A wooden door
d) Air
Ans: c) A wooden door
A wooden door is an opaque object, meaning you cannot see through it.
Q7: What happens when you mix sand with water?
a) The sand dissolves
b) The sand remains suspended
c) The sand forms a separate layer
d) The sand evaporates
Ans: c) The sand forms a separate layer
Sand does not dissolve in water and instead forms a separate layer at the bottom of the container.
Q9: What is the SI unit of mass?
a) Gram
b) Kilogram
c) Milligram
d) Litre
Ans: b) Kilogram
The SI unit of mass is the kilogram (kg).
Q10: Which property describes materials that are difficult to compress?
a) Softness
b) Hardness
c) Lustre
d) Transparency
Ans: b) Hardness
Hardness is a property that indicates how resistant a material is to deformation, scratching, or compression. Materials that are difficult to compress are considered hard because they resist changes in their shape under pressure. For example, metals and rocks are hard materials that do not compress easily compared to softer materials like rubber or foam.
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1. What are some examples of materials that can be found around us? |
2. How are materials classified based on their properties? |
3. Why is it important to study materials around us? |
4. How can materials be recycled to reduce environmental impact? |
5. What are some common everyday uses of materials like plastic and metal? |
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