Identify the alloy containing a non metal as a constitunt in it

Options

A. invar
B. Steel
C. Bell-metal
D. Bronze

Explanation

To identify the alloy containing a non-metal as a constituent, we will analyze the given options and their respective constituents step by step.

### Step 1: List the given alloys and their constituents
We have four alloys to consider:
1. **Invar**
2. **Steel**
3. **Bell Metal**
4. **Bronze**

### Step 2: Identify the constituents of each alloy
- **Invar**: The constituents are Iron (Fe) and Nickel (Ni).
- **Steel**: The constituents are Iron (Fe) and Carbon (C).
- **Bell Metal**: The constituents are Copper (Cu) and Tin (Sn).
- **Bronze**: The constituents are Copper (Cu) and Tin (Sn).

### Step 3: Determine the nature of each constituent
Now, we will categorize the constituents of each alloy into metals and non-metals:
- **Invar**: Fe (metal) + Ni (metal)
- **Steel**: Fe (metal) + C (non-metal)
- **Bell Metal**: Cu (metal) + Sn (metal)
- **Bronze**: Cu (metal) + Sn (metal)

### Step 4: Identify the alloy with a non-metal constituent
From our analysis:
- Invar contains only metals.
- Steel contains Iron (metal) and Carbon (non-metal).
- Bell Metal contains only metals.
- Bronze contains only metals.

The only alloy that contains a non-metal as a constituent is **Steel**, which includes Carbon.

### Conclusion
The alloy containing a non-metal as a constituent is **Steel**.

---