10 Questions
What was the primary criterion used to establish the scale of hardness in the olden days?
The simple scratch test
Which of the following statements is true about the hardness of materials?
Hardness indicates resistance to penetration by another body
Which material was placed at the top of the hardness scale in the olden days?
Diamond
What does the term 'abrasion' refer to in the context of hardness?
The scratching or wearing away of a material's surface
Based on the information provided, which of the following statements is false?
The hardness scale was established using complex laboratory tests
Which of the following is NOT a characteristic of a hard material, according to the passage?
Susceptibility to corrosion
If a material X can scratch material Y, based on the information given, what can be inferred about their relative hardness?
Material X is harder than material Y
Which of the following statements is NOT true about the hardness scale mentioned in the passage?
The scale was based on the materials' resistance to compression
According to the passage, which of the following statements is true about glass?
Glass was placed below diamond on the hardness scale
Based on the information in the passage, which of the following scenarios is most likely to occur?
A diamond scratching a piece of glass
Study Notes
Hardness of Materials
- Hardness is a crucial property of materials that indicates wear-resistance and resistance against abrasion or scratching.
- A hard material also offers resistance to penetration by another body.
- The scale of hardness was established with diamond, the hardest known material, at the top.
- Glass and other materials were placed lower down on the scale.
- The scratch test was used to determine the hardness of materials, where a material that could scratch another was considered harder.
- The hardness of a material is determined by its ability to resist scratching or abrasion.
Test your knowledge on material hardness, wear-resistance, and the scratch test method used to determine the hardness of different materials. Learn about the scale of hardness and how diamond compares to other materials.
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