Question

Two statements are given below: 
Statement I: Viscosity of liquid decreases with increase in temperature. 
Statement II: The units of viscosity coefficient are Pascal sec. The correct answer is:

• A. Both statement-I and statement-II are correct.
• B. Both statement-I and statement-II are not correct.
• C. Statement-I is correct but statement-II is not correct.
• D. Statement-I is not correct but statement-II is correct.

Hint:

Viscosity of liquids typically decreases with an increase in temperature. Additionally, the units of dynamic viscosity are Pascal seconds (Pa·s).

Answer 1

The Correct Option is A

Let's examine both statements: 
Statement I: Viscosity of liquid decreases with increase in temperature. 
This statement is correct. As temperature increases, the kinetic energy of molecules also increases, which reduces the intermolecular forces and allows molecules to move more freely. As a result, the viscosity of the liquid decreases.
Statement II: The units of viscosity coefficient are Pascal sec. 
This statement is also correct. The viscosity coefficient, also known as dynamic viscosity, is defined as the ratio of the shear stress to the shear rate. The units of viscosity are Pascal·second (Pa·s), which is equivalent to kg·m^-1·s^-1.
Since both statements are correct, the correct answer is:

\(\boxed{(A) \, \text{Both statement-I and statement-II are correct.}}\)