Assertion:- Rise of water level in capilary tube should be accounted vertically and not on the length of the pipe in which it has rised
Reason:- More the radius, the rise will decrease for different liquids tested.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion `&` Reason are False.

Answer

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 the rise of water level in a capillary tube should be accounted vertically and not based on the length of the pipe in which it has risen.
- This is true because the height to which the liquid rises in a capillary tube is determined by the balance of forces acting on the liquid column, specifically the surface tension and the weight of the liquid.

2. **Understanding the Reason**:
- The reason states that "more the radius, the rise will decrease for different liquids tested."
- This statement is misleading. While it is true that the height of the liquid column is inversely proportional to the radius of the capillary tube (h ∝ 1/r), this relationship holds true for the same liquid. When different liquids are tested, the surface tension and contact angle also vary, which affects the height of the liquid column.

3. **Analyzing the Relationship**:
- The height of the liquid in the capillary tube can be expressed by the formula:
\[ h = \frac{2T \cos \theta}{\rho g r} \]
where:
- \( h \) = height of the liquid rise,
- \( T \) = surface tension of the liquid,
- \( \theta \) = contact angle,
- \( \rho \) = density of the liquid,
- \( g \) = acceleration due to gravity,
- \( r \) = radius of the capillary tube.
- From this formula, we can see that as the radius \( r \) increases, the height \( h \) decreases, but this is only valid for the same liquid.

4. **Conclusion**:
- The assertion is true because the rise of water is indeed measured vertically.
- The reason is false because it incorrectly states the relationship between radius and height for different liquids without considering the effects of surface tension and contact angle.

### Final Answer:
- Assertion: True
- Reason: False
- Therefore, the correct answer is that the assertion is true and the reason is false.