Bearings are prepared using the alloy

Options

A. Gun metal
B. Aluminium Bronze
C. Bell metal
D. German silver

Answer

### Step-by-Step Solution:

1. **Understanding Alloys**:
- Alloys are mixtures of two or more metals, or a metal and a non-metal, designed to enhance certain properties such as strength, corrosion resistance, and durability.

2. **Analyzing the Options**:
- We have four options:
- **Gun Metal**: Composed of copper (Cu), tin (Sn), and zinc (Zn).
- **Aluminium Bronze**: Composed of copper (Cu), tin (Sn), and aluminium (Al).
- **Bell Metal**: Composed of copper (Cu) and tin (Sn).
- **German Silver**: Composed of copper (Cu), zinc (Zn), and nickel (Ni).

3. **Identifying the Suitable Alloy for Bearings**:
- Bearings require materials that can withstand high pressure and have good corrosion resistance.

4. **Evaluating Gun Metal**:
- Gun metal, also known as red brass, is made up of approximately 88% copper, 8-10% tin, and 2-4% zinc.
- Its properties include high strength and excellent resistance to corrosion, making it suitable for bearings.

5. **Conclusion**:
- Based on the properties and composition, the correct alloy used for making bearings is **Gun Metal**.

### Final Answer:
Bearings are prepared using the alloy **Gun Metal**.

---