Question

An ideal fluid is the one which:

• A. Offers resistance to flow
• B. Offers resistance to deformation
• C. Has no viscosity
• D. Has infinity viscosity

Hint:

Remember that "ideal" in physics and engineering often refers to a simplified model that neglects certain real-world complexities. In the case of an ideal fluid, viscosity and sometimes compressibility are neglected to make analysis simpler.

Answer 1

The Correct Option is C

Step 1: Understand the concept of an ideal fluid.
An ideal fluid is a theoretical concept used in fluid mechanics. It is defined as a fluid that is incompressible and has no viscosity. Viscosity is the measure of a fluid's resistance to flow when an external force is applied.
Step 2: Analyze each option based on the definition of an ideal fluid.
Option 1 (Offers resistance to flow): A fluid that offers resistance to flow has viscosity. An ideal fluid, by definition, has no viscosity and therefore offers no resistance to flow. This option is incorrect.
Option 2 (Offers resistance to deformation): All real fluids offer some resistance to deformation when a shear stress is applied. However, an ideal fluid is defined as having zero viscosity, meaning it cannot sustain any shear stress without continuous deformation. While related to viscosity, this statement is not the most direct definition of an ideal fluid. The key characteristic is the absence of viscosity.
Option 3 (Has no viscosity): This is the defining characteristic of an ideal fluid. A fluid with zero viscosity offers no resistance to shear and will deform continuously under the slightest shear stress.
Option 4 (Has infinity viscosity): A fluid with infinite viscosity would not flow at all, behaving like a solid. This is the opposite of an ideal fluid. This option is incorrect.
Step 3: Identify the option that accurately describes an ideal fluid.
The defining property of an ideal fluid is that it has no viscosity.
Step 4: Select the correct answer.
An ideal fluid is the one which has no viscosity.