NEETPhysicsMechanical Properties of Solids
Assertion (A): Strain is a unit-less quantity. Reason (R): Strain is equivalent to force.
Options
- ABoth (A ) and (R ) are true and (R ) is the correct explanation of (A ).
- BBoth (A ) and (R ) are true but (R ) is not the correct explanation of (A ).
- C(A ) is true but (R ) is false.
- DA is false but R is true.
Correct answer
C. (A ) is true but (R ) is false.
Step-by-step solution
Strain is defined as the ratio of change in dimensions of the body to the original dimensions. Since it is a ratio of two quantities with the same units, strain is indeed a unit-less quantity. Therefore, Assertion (A) is true. However, strain is a measure of deformation, while force is a push or pull. They are entirely different physical quantities and are not equivalent. Thus, Reason (R) is false.