[amp_mcq option1=”resistance to shear stress is small” option2=”fluid pressure is zero” option3=”linear deformation is small” option4=”only normal stresses can exist” correct=”option4″]
The correct answer is: D. only normal stresses can exist
A static fluid is a fluid that is not moving. In a static fluid, there is no shear stress, which is a force that acts parallel to the surface of an object. This is because the molecules in a static fluid are not moving relative to each other, so there is no force acting to cause them to slide past each other.
There is, however, a normal stress, which is a force that acts perpendicular to the surface of an object. This is because the molecules in a static fluid are still exerting pressure on each other, even though they are not moving.
Options A, B, and C are incorrect because they all describe properties of fluids that are not static. Option A states that resistance to shear stress is small. However, in a static fluid, there is no shear stress, so there is no resistance to it. Option B states that fluid pressure is zero. However, in a static fluid, there is still pressure, even though it is not uniform. Option C states that linear deformation is small. However, in a static fluid, there is no deformation at all.