An **ideal fluid** has all the following properties EXCEPT:
AIncompressible (constant density)
BNon-viscous (zero internal friction)
CIrrotational and steady flow
DVery high viscosity
Answer & Solution
Correct answer: D. Very high viscosity
Ideal fluid: incompressible, irrotational, non-viscous, steady flow. High viscosity contradicts the non-viscous requirement. Real fluids deviate from ideality in all four respects.
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