MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
What is the unit of density?
Think it through first, then pick an option.
- a kg m⁻³
- b Pa
- c Nm⁻²
- d kg ms⁻¹
Answer and explanation
Correct answer: a kg m⁻³
Density = mass ÷ volume, so the unit is kg/m³, that is kg m⁻³.
Why the other options are wrong
- b Pa: The Pa is the unit of pressure (force ÷ area); density is mass ÷ volume.
- c Nm⁻²: The Nm⁻² is the unit of pressure or stress; the unit of density comes from mass and volume.
- d kg ms⁻¹: The kg ms⁻¹ has no volume in it; density divides the mass by a volume (m³).
Your account is open, so all 30,000+ MCQs from every chapter are yours. Start practising SSC Physics →
Want to keep going?
A free account carries you on to the next questions and opens 30,000+ MCQs from every chapter. Join before launch and Chirkut bundles are 60% off.
The ones you missed, worth one more look