Question

36. Which one of the following quantities does not have unit?
(A) Stress
(B) Force
(C) Strain
(D) Pressure
(E) None of the above/More than one of the above =

Answer 1

Strain does not have unit.

Option: C

Explanation:

• Strain is defined as the ‘deformation’ produced in a solid due to stress. It is measured by calculating the ratio of the two lengths. As a result it does not have any unit.  

• Stress on the other hand is the ‘force per unit area’ on a body that tries to cause a change in shape. It is measured by the SI unit is Pascal.

• Force is measured by the product of mass and acceleration. Its SI unit is Newton.

• Pressure is measured by force per unit area. Its SI unit is Pascal.

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