MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
What is the unit of bulk modulus?
Think it through first, then pick an option.
- a Nm²
- b Nm⁻²
- c Nm⁻¹
- d Jm⁻²
Answer and explanation
Correct answer: b Nm⁻²
Right. Volume strain has no unit, so B has the unit of pressure, Nm⁻² or Pa.
Why the other options are wrong
- a Nm²: Nm² would multiply by area; B = pressure ÷ volume strain, so its unit is Nm⁻².
- c Nm⁻¹: Nm⁻¹ is force ÷ length; B has an area underneath, not a length.
- d Jm⁻²: Jm⁻² = Nm⁻¹ (J = N·m), so it is also force ÷ length; it is not the unit of B.
More board questions on this topic
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- Which two quantities have the same dimension?
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