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SSC Selection Post 2022 PYQ — Question 28

SSC Selection Post - Matriculation Level 2022 - 2 Feb 2022 - Shift 3 • General Awareness • Q28

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Which of the following is dimensionless?

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Correct answer: D

Explanation

The correct answer is option 4 i.e. Longitudinal strain.

Longitudinal strain is dimensionless.

  • Longitudinal strain is defined as the ratio of change in length (ΔL)to the original length (L), i.e., Longitudinal Strain=ΔL/L.

  • Since both the numerator and denominator have the same unit (length), the units cancel out, making it a dimensionless quantity.

  • Longitudinal stress and shear stress have units of pressure (N/m² or Pascal).

  • Deforming force has units of force (Newton).