Fluid Mechanics - GATE practice papers - Mechanical for Q. 367

Q.  Which of the following is actually an ideal fluid?(Marks: 02)
- Published on 19 Oct 15

a. air
b. water
c. oil
d. none of the above

ANSWER: none of the above
 
The fluid which is incompressible and which has no viscosity is known as an ideal fluid. Water and oil have some viscosity among the above fluids. Viscosity of air can be negligible but it is not incompressible. Therefore ideal fluid is only a hypothetical fluid. All the existing fluids have some viscosity.

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