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Questions and Answers
What was the primary criterion used to establish the scale of hardness in the olden days?
What was the primary criterion used to establish the scale of hardness in the olden days?
- Diamond's ability to scratch other materials
- The simple scratch test (correct)
- The resistance of materials to wear and abrasion
- The resistance of materials to penetration
Which of the following statements is true about the hardness of materials?
Which of the following statements is true about the hardness of materials?
- Diamond is the softest known material
- Hardness indicates resistance to penetration by another body (correct)
- Hardness is not related to wear-resistance or resistance against scratching
- Glass is harder than diamond
Which material was placed at the top of the hardness scale in the olden days?
Which material was placed at the top of the hardness scale in the olden days?
- Steel
- Diamond (correct)
- Quartz
- Glass
What does the term 'abrasion' refer to in the context of hardness?
What does the term 'abrasion' refer to in the context of hardness?
Based on the information provided, which of the following statements is false?
Based on the information provided, which of the following statements is false?
Which of the following is NOT a characteristic of a hard material, according to the passage?
Which of the following is NOT a characteristic of a hard material, according to the passage?
If a material X can scratch material Y, based on the information given, what can be inferred about their relative hardness?
If a material X can scratch material Y, based on the information given, what can be inferred about their relative hardness?
Which of the following statements is NOT true about the hardness scale mentioned in the passage?
Which of the following statements is NOT true about the hardness scale mentioned in the passage?
According to the passage, which of the following statements is true about glass?
According to the passage, which of the following statements is true about glass?
Based on the information in the passage, which of the following scenarios is most likely to occur?
Based on the information in the passage, which of the following scenarios is most likely to occur?
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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.
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