Which of the following alloys contain (s) Cu and Zn?

Options

A. Bronze
B. Brass
C. Gun metal
D. Type metal

Explanation

To determine which of the following alloys contain copper (Cu) and zinc (Zn), we will analyze each alloy mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Alloys**: The alloys listed in the question are bronze, brass, gunmetal, and tight metal.

2. **Analyze Bronze**:
- Bronze is primarily an alloy of copper and tin.
- It typically contains about 88-90% copper and 10-12% tin.
- **Conclusion**: Bronze does NOT contain zinc.

3. **Analyze Brass**:
- Brass is an alloy of copper and zinc.
- The composition of brass can vary, but it generally contains a significant amount of copper (around 55-85%) and zinc (around 15-45%).
- **Conclusion**: Brass DOES contain zinc.

4. **Analyze Gunmetal**:
- Gunmetal is an alloy made of copper, tin, and zinc.
- A typical composition is approximately 88% copper, 10% tin, and 2% zinc.
- **Conclusion**: Gunmetal DOES contain zinc.

5. **Analyze Tight Metal**:
- Tight metal, or type metal, is primarily an alloy of lead, antimony, and tin.
- It typically contains about 82% lead, 15% antimony, and 3% tin.
- **Conclusion**: Tight metal does NOT contain copper or zinc.

### Final Answer:
The alloys that contain copper and zinc are **brass (option B)** and **gunmetal (option C)**.