Which of the following is an opaque material?

Options

A. Clear water
B. Butter paper
C. Plastic Scale
D. Rubber

Answer

To determine which of the following is an opaque material, we will analyze the properties of each material mentioned in the question.

### Step-by-Step Solution:

1. **Understand the Types of Materials**:
- **Opaque**: Materials that do not allow any light to pass through. Objects behind opaque materials cannot be seen at all.
- **Transparent**: Materials that allow light to pass through completely, enabling clear visibility of objects behind them.
- **Translucent**: Materials that allow some light to pass through but scatter it, resulting in a blurred vision of objects behind them.

2. **Evaluate Each Material**:
- **Clear Water**: This is a transparent material because we can see through it clearly.
- **Butter Paper**: This is a translucent material. We can see through it, but the vision is blurred.
- **Plastic Scale**: This is also a transparent material, allowing us to see through it clearly.
- **Rubber**: This is a hard and dark-colored material that does not allow light to pass through. Therefore, we cannot see through rubber.

3. **Identify the Opaque Material**:
- Among the materials listed, rubber is the only one that does not allow any light to pass through, making it opaque.

4. **Conclusion**:
- The correct answer to the question "Which of the following is an opaque material?" is **rubber**.