Which of the physical quantities does not have the same units:
Correct answer: B. Pressure and Strain
- A. Impulse and Momentum
- B. Pressure and Strain
- C. Plancks constant and angular momentum
- D. Bulk modulus and compressibility
Explanation
Pressure (denoted by P) and strain are related to the deformation of materials. Pressure is defined as force per unit area (P=F/A), and its units are force divided by area (N/m)2, which is equivalent to Pascal, denoted as Pa). Strain, on the other hand, is the ratio of the change in size to the original size and is dimensionless, meaning it has no units. Therefore, pressure and strain do not have the same units.
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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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