Assertion In summers, a metallic scale will read more than the actual.
Reason In summers, length of methallic scale will increase.

Options

A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B. If both Assertion and Reason are correct but Reason is not the correct explation os Assertion.
C. If Assertionis true bur Reason is false.
D. If Assertion is false but Reason is true.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "In summers, a metallic scale will read more than the actual." This implies that the reading of the scale is higher than the true measurement.

2. **Understanding the Reason**:
- The reason states that "In summers, the length of the metallic scale will increase." This is based on the principle of thermal expansion, where materials expand when heated.

3. **Analyzing the Effect of Temperature on the Scale**:
- As the temperature increases in summer, the metallic scale will indeed expand. This means that the physical length of the scale itself increases due to thermal expansion.

4. **Impact on Measurement**:
- If the scale expands, the markings on the scale (which are fixed) will now represent a longer length than they did at a lower temperature. For example, if a measurement that should read 3 cm is taken, the scale may now read a value less than 3 cm because the actual object being measured has not expanded in the same way as the scale.

5. **Conclusion**:
- Therefore, while the reason is true (the length of the metallic scale increases), the assertion is false because the reading on the scale will actually be less than the actual measurement due to the expansion of the scale itself.

### Final Answer:
- Assertion: False
- Reason: True