Question

Which of the following is the basic property of fluid?
1. Never regain its original shape on release of shear stress
2. It undergoes a definite deformation 
3. More compact in structure 
4. Can resist tangential stresses in static condition 

Answer 1

Correct Answer - Option 1 : Never regain its original shape on release of shear stress

Explanation:

Fluid :

• A fluid is a substance that is the ability to flow OR deform continuously under the action of shear force(No matter how small the force is).
• For static fluid shear force is zero.
• A substance in the liquid/gas phase is referred to as ‘fluid'.

 

Comparison between Fluids and solids

Fluids	Solids
Fluids have no shape	Solids have a definite shape
Fluids cannot sustain a shear force, i.e. a fluid is always in motion	Solids can sustain a shear force; i.e. they remain static
Stress is a function of the rate of strain, thus a fluid had a `dynamic' state	Stress is a function of strain, thus a solid maintains a static or `quasi-static' state.
On removal of load, Fluid  will never  try to regain its original position	On removal of load solid will try to regain their original position