Ncert Exercises & Solutions

The modulus of rigidity of the ideal liquid is:

1.	infinity
2.	zero
3.	unity
4.	some finite small non-zero constant value

(b) Hint: Ideal fluids provide no resistance to shear forces.

No frictional (viscous) force exists in the case of an ideal fluid, hence, tangential forces are zero, so there is no stress developed.