The handle of every repairing tool is covered by a certain insulating material so that the user may not get an electric shock. Which of the following materials cannot be used to cover the handle

Options

A. Wood
B. Plastic
C. Glass
D. Tin

Explanation

To determine which material cannot be used to cover the handle of a repairing tool, we need to identify the properties of the materials listed. The handle should be covered with an insulating material to prevent electric shocks. Here’s the step-by-step solution:

### Step 1: Understand the Purpose of Insulating Materials
The primary purpose of using insulating materials on the handles of repairing tools is to prevent electric shocks. Insulating materials do not allow electric current to pass through them.

### Step 2: Identify the Types of Materials
We need to categorize the materials based on their ability to conduct electricity:
- **Conductors**: Materials that allow electric current to pass through (e.g., metals like tin).
- **Insulators**: Materials that do not allow electric current to pass through (e.g., wood, plastic, glass).

### Step 3: Analyze the Given Materials
Let's analyze the materials mentioned:
- **Wood**: This is a non-conductor (insulator) and is safe to use.
- **Plastic**: This is also a non-conductor (insulator) and is safe to use.
- **Glass**: This is another non-conductor (insulator) and is safe to use.
- **Tin**: This is a conductor and allows electric current to pass through, which can lead to electric shocks.

### Step 4: Conclusion
Since the question asks for the material that cannot be used to cover the handle of repairing tools, the answer is **tin**, as it is a conductor.

### Final Answer
The material that cannot be used to cover the handle of repairing tools is **tin**.

---