Question

Given below are two statements:
Statement-I: The hot water flows faster than cold water.
Statement-II: Soap water has higher surface tension as compared to fresh water.
In the light of the above statements, choose the correct answer from the options given below:

• A. Statement-I is false but Statement II is true
• B. Statement-I is true but Statement II is false
• C. Both Statement-I and Statement-II are true
• D. Both Statement-I and Statement-II are false

Hint:

Hot water flows faster than cold water due to its lower viscosity, and soap reduces the surface tension of water.

Answer 1

The Correct Option is B

The solution involves analyzing each statement based on principles of physics.

Statement-I: "The hot water flows faster than cold water."

Explanation: This statement is related to viscosity. Viscosity is a measure of a fluid's resistance to deformation at a given rate. As temperature increases, the viscosity of liquids generally decreases, meaning they flow more easily. Hence, hot water has lower viscosity than cold water, allowing it to flow faster. Therefore, Statement-I is true.

Statement-II: "Soap water has higher surface tension as compared to fresh water."

Explanation: Surface tension arises due to cohesive forces between liquid molecules. When soap is added to water, it decreases the cohesive forces by disrupting the hydrogen bonds between water molecules. This results in decreased surface tension. Therefore, soap water has lower surface tension than fresh water, making Statement-II false.

Combining these analyses, the correct choice is that Statement-I is true but Statement-II is false.