Question detail
Why are aluminium alloys preferred over pure aluminium in many applications?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using materials
Question
- A. They are more reactive.
- B. They have better mechanical properties.
- C. They are lighter than pure aluminium.
- D. They are more expensive.
Answer
The correct option is They have better mechanical properties.. This answer is correct because it matches the approved learning objective to describe aluminium alloys as low density materials. (Chemistry only) in the subtopic Alloys as useful materials.
Explanation
The correct option is They have better mechanical properties.. They have better mechanical properties. is correct because it directly supports the approved learning objective to describe aluminium alloys as low density materials. (Chemistry only). This belongs to the subtopic Alloys as useful materials within Using materials, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Alloys as useful materials.
Common mistake
Misunderstanding Density
Students often confuse low density with lightweight materials, thinking all low-density materials are weak or fragile.
Emphasize that low density refers to the mass per unit volume and does not necessarily indicate strength; aluminium alloys can be both low density and strong.
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