MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
The pascal is the unit of which of the following quantities?
Think it through first, then pick an option.
- a stress
- b strain
- c kinetic energy
- d buoyancy
Answer and explanation
Correct answer: a stress
The unit of stress is the Pa (pascal), that is Nm⁻², the same as for pressure.
Why the other options are wrong
- b strain: Strain is a ratio of two lengths, so it has no unit.
- c kinetic energy: Kinetic energy is not force ÷ area; the pascal is Nm⁻², the unit of force ÷ area.
- d buoyancy: Buoyancy is an upward force, in N; the pascal is the unit of force ÷ area.
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