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NDA 1 2025 GAT, question 139

Topic: Physics

Q139

Which one of the following is dimensionless quantity ?

  1. (a) Stress
  2. (b) StrainCorrect answer
  3. (c) Pressure
  4. (d) Force

Solution.

Answer: (b) Strain

  1. Strain is a ratio such as ΔL/L\Delta L/L, so the length units cancel.
  2. Stress and pressure are force per unit area and have unit pascal; force has unit newton.
  3. Hence strain is dimensionless.