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Q: Flow of fluid take place due to its:
  • A. Viscosity.
  • B. Compressibility.
  • C. Surface tension.
  • D. Deformation under shear force.
Correct Answer: Option D - Any substance in gaseous/liquid phase is called as fluid. Fluid is a substance that continually deforms (flow) under an applied shear stress. Fluid does not have tensile strength, but it has compressive strength only when it is kept in closed container.
D. Any substance in gaseous/liquid phase is called as fluid. Fluid is a substance that continually deforms (flow) under an applied shear stress. Fluid does not have tensile strength, but it has compressive strength only when it is kept in closed container.

Explanations:

Any substance in gaseous/liquid phase is called as fluid. Fluid is a substance that continually deforms (flow) under an applied shear stress. Fluid does not have tensile strength, but it has compressive strength only when it is kept in closed container.