An alloy of copper and aluminium which has beautiful golden yellow colour is called `"………….."`.

Answer

**Step-by-Step Solution:**

1. **Identify the Components of the Alloy**: The alloy in question is made of two metals: copper and aluminum.

2. **Recognize the Characteristics of the Alloy**: The alloy is noted for its beautiful golden yellow color, which is a distinctive feature that can help in identifying it.

3. **Determine the Name of the Alloy**: Based on the combination of copper and aluminum, and the specific color mentioned, the alloy is identified as "Aluminium Bronze".

4. **Understand the Composition**: Aluminium Bronze typically consists of about 14% aluminum mixed with copper, which contributes to its unique properties and color.

5. **Know the Applications**: This alloy is used in various applications, particularly in the defense sector, such as in the construction of submarines.

**Final Answer**: The alloy of copper and aluminum which has a beautiful golden yellow color is called **"Aluminium Bronze"**.

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