Question

Which one of the following does not have unit of force per unit area:

• A. $Stress$
• B. $Strain$
• C. $YoungsModulus$
• D. $pressure$

Answer 1

Answer: (B)

$Strain$

• Stress 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.

• 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.

• 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.

So correct answer is option (B).