Read the assertion and reason carefully and mark the correct option given below. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not the correct explanation of the assertion. (c) If assertion is true but reason is false. (d) If the assertion and reason both are false. Assertion: When height of a tube is less then liquid rise in the capillary tube the liquid does not overflow. Reason: Product of radius of meniscus and height of liquid incapilling tube always remains constant. (A) a (B) \(b\) (C) c (D) d

The assertion states that "when the height of a tube is less than the liquid rise in the capillary tube, the liquid does not overflow." Capillary action is the ability of a liquid to flow against gravity into a narrow space due to surface tension and adhesive forces. Here, we should consider whether the liquid overflows when the height of the tube is less than the rise of the liquid or not.

The reason given is: "The product of the radius of the meniscus and the height of the liquid in the capillary tube always remains constant." This statement is related to the geometrical aspect of the meniscus formed by the liquid in the tube and isn't directly linked to overflow of liquid from the tube.

Now let's first evaluate if the assertion is correct or not. If the height of the tube is less than the liquid rise in the capillary tube, it means that the liquid will fill the entire available height of the tube. However, due to surface tension and adhesive forces, the liquid does not necessarily overflow even when there's no more space for it to rise. Hence, the assertion is true. Now, let's evaluate if the reason is true or not. The statement "Product of the radius of the meniscus and height of the liquid in the capillary tube always remains constant" is not accurate. The reason is because several factors, such as the size of the tube, its material and surface properties, and the nature of the liquid, affect both the meniscus radius and the height of the liquid. So, the reason is false. We have now determined that the assertion is true, but the reason is false. Based on this analysis, the correct answer is:

(C) If assertion is true, but reason is false.