Question

Which of the listed properties is unit less ?
1. Surface tension
2. Dynamic viscosity
3. Shear stress
4. Strain

Answer 1

Correct Answer - Option 4 : Strain

CONCEPT:

Strain: Strain is a measure of the deformation of the material as a result of the force applied.

• The strain is a unitless quantity.

Stress: Stress is the ratio of the load or force to the cross-sectional area of the material to which the load is applied.

• The standard unit of stress is N/m2.

Hooke's law states that within the elastic limit the stress applied on a body is directly proportional to the strain produced.

⇒ Strain ∝ Stress

⇒  Strain = E × Stress  (Where E = modulus of elasticity)