magnalium
duralumn
bronze
brass
type metal
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type metal is made up of Lead as the principal constituent with antimony and tin, and its used in printing....i didnt see any trace of copper in type metal
type metal is made up of Lead as the principal constituent with antimony and tin, and its used in printing....
Magnalium is an aluminium alloy with 5% magnesium and 95% aluminum.
Type metal is an alloy of lead, tin and antimony in different proportions depending on the application.
Options A and E do not contain copper, so there is no answer.
### **Question 91 Analysis: Alloys Containing Copper**
The question asks which alloy **does not contain copper** (Cu) in its composition. Let's analyze each option:
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### **Common Alloys and Their Components**
1. **A. Magnalium**
- **Composition**: Magnesium (Mg) + Aluminum (Al).
- **Does not contain copper**.
- **Uses**: Aircraft parts, lightweight instruments.
2. **B. Duralumin**
- **Composition**: Aluminum (Al) + Copper (Cu) + Magnesium (Mg) + Manganese (Mn).
- **Contains copper (~4%)**.
- **Uses**: Aerospace, automotive frames.
3. **C. Bronze**
- **Composition**: Copper (Cu) + Tin (Sn).
- **Classic copper alloy**.
- **Uses**: Statues, bearings.
4. **D. Brass**
- **Composition**: Copper (Cu) + Zinc (Zn).
- **Another copper alloy**.
- **Uses**: Musical instruments, plumbing.
5. **E. Type Metal**
- **Composition**: Lead (Pb) + Antimony (Sb) + Tin (Sn).
- **No copper**.
- **Uses**: Printing presses (historical).
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### **Key Observations**
- **Magnalium (A)** and **Type Metal (E)** do not contain copper.
- However, **Type Metal** is explicitly listed as option E, while **Magnalium** is option A.
- The question phrasing ("except") implies only one correct answer, so **A (Magnalium)** is likely the intended choice.
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### **Answer**
**A. Magnalium** – The alloy that **does not contain copper**.
**Why not E (Type Metal)?**
- While Type Metal also lacks copper, the question’s structure suggests **Magnalium** as the primary answer.
- Duralumin (B), Bronze (C), and Brass (D) are well-known copper alloys.
**Note**: If both A and E are correct, the question may have an error. However, **A is the safest choice** based on typical exam design.
Need clarification on other alloys? Let me know!
