Which one of the following physical quantity does not the dimension of force per unit area:
Correct answer: B. Strain
- A. Stress
- B. Strain
- C. Young modulus
- D. Pressure
Explanation
The strain unit is dimensionless. It is the ratio between the length shift and the initial length, so it is unit-less. Thus B, strain, is the correct option
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Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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