Questions and Answers
Which of the following materials is an example of a rough surface?
All metals in their pure state have a dull appearance.
False
What is the property of materials that describes their ability to withstand compression?
hardness
Materials such as ______ and ______ do not allow light to pass through them at all.
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Match the following materials with their corresponding properties:
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Which material is an example of a soft material?
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A material's lustre refers to its ability to transmit light.
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What types of materials are categorized based on transparency?
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A ______ material allows some light to pass through but not enough to see clearly.
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Which of the following is NOT a property of materials listed?
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Study Notes
Grouping on the Basis of Common Properties
- Objects are made from various materials, each determined by specific properties.
- The properties influence the selection of materials for different uses, impacting object functionality.
- Common properties of materials include roughness, lustre, hardness, transparency, solubility, flotation, magnetic attraction, and conduction of heat and electricity.
Roughness
- Materials can be categorized as rough or smooth based on surface texture.
- Rough materials feature bumps or ridges; examples include rocks, sandpaper, and tree bark.
- Smooth materials lack surface irregularities; examples include glass sheets, flower petals, and the surface of apples.
Lustre
- Lustre refers to the shiny quality of a material, primarily found in metals.
- Pure metals exhibit lustre, making them preferable for jewelry and decorative items.
- Materials known for their lustre include gold, silver, and bronze.
Hardness
- Materials are classified as hard or soft based on their resistance to compression.
- Hard materials (e.g., rocks, wood, iron, diamond) resist deformation under pressure.
- Soft materials (e.g., rubber, sponge, cotton, wool) are easily compressed.
Transparency
- Transparency is the property that dictates how much light a material allows to pass through.
- Materials can be grouped into three categories based on transparency:
- Transparent: Allow most light to pass through (e.g., clear glass).
- Translucent: Allow some light through but not clear images (e.g., frosted glass).
- Opaque: Do not allow light to pass through (e.g., wood, metals).
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Description
Explore how materials are categorized based on common properties like roughness, lustre, and hardness. Understand the significance of these properties in selecting materials for various applications. This quiz will deepen your knowledge of material properties and their practical implications.
