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Which of the given options correctly fills the blank?

_______ is the unit of strain.

1. Meter
2. Newton
3. Strain is a unit less quantity
4. Pascal

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Correct Answer - Option 3 : Strain is a unit less quantity


  • The strain is defined as the ratio of change in dimension to the original dimension.
  • If ‘δl’ changes in the length and ‘l’ is the original length, then strain = δl/l.
  • Hence the unit of Strain is mm/mm.

Therefore Strain has no unit. Hence it is a dimensionless term.

  • The ratio of change in length to the original length is called the  longitudinal strain.
  • The ratio of change in diameter/breadth to the original diameter/breadth is called the lateral strain.
  • The ratio of lateral strain to longitudinal strain is called the Poisson's ratio.
  • The volumetric strain of a deformed body is defined as the ratio of the change in volume of the body to the deformation to its original volume.
  • Shear strain is defined as the strain accompanying a shearing action. It is the angle in radian measure through which the body gets distorted when subjected to external shearing action.

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