Button cells are used in wall clock .

Explanation

To determine whether the statement "Button cells are used in wall clocks" is true or false, we can follow these steps:

### Step 1: Understand the types of cells
- **Button Cells**: These are small, round batteries commonly used in devices like wristwatches, hearing aids, and small electronic gadgets.
- **Dry Cells**: These are cylindrical batteries that are often used in larger devices, such as wall clocks, flashlights, and remote controls.

### Step 2: Identify the application of each type of cell
- **Wall Clocks**: Typically, wall clocks require a power source that can provide a steady and longer-lasting supply of energy. For this purpose, dry cells are preferred due to their larger size and capacity.
- **Wristwatches**: These devices are compact and require smaller batteries, which is where button cells come into play.

### Step 3: Analyze the statement
- The statement claims that button cells are used in wall clocks. However, based on the information gathered, wall clocks primarily use dry cells, not button cells.

### Step 4: Conclusion
- Since wall clocks do not use button cells but rather dry cells, the statement "Button cells are used in wall clocks" is **false**.

### Final Answer
The statement is **false**.

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