Density and Upthrust Quiz

What is the definition of density?

• Mass per unit area
• Mass per unit volume
• Volume per unit mass
• Weight per unit volume

Which formula correctly represents density?

• ρ = mass × volume
• ρ = mass / volume
• ρ = volume / mass
• ρ = mass + volume

If an object has a mass of 10 kg and a volume of 2 m³, what is its density?

• 5 kg/m³
• 20 kg/m³
• 10 kg/m³
• 15 kg/m³

What does upthrust refer to?

• Downward force on an object
• Upward force experienced by a submerged object
• Force due to gravity
• Frictional force on an object

What causes the upthrust on an object submerged in a fluid?

• Weight of the object
• Pressure differences on the object's surfaces
• Temperature of the fluid
• Density of the fluid

How does the density of a substance affect its buoyancy?

• Higher density always leads to higher buoyancy
• Lower density leads to higher buoyancy
• Density does not affect buoyancy
• Buoyancy is only affected by volume

An object floats in water. What can be inferred about its density compared to water?

• It has a higher density than water
• It has a lower density than water
• It has the same density as water
• Density cannot be determined

If the volume of an object increases while its mass remains constant, what happens to its density?

• Density increases
• Density decreases
• Density remains the same
• Density becomes zero

Which of the following statements about density is true?

• Density is always constant for a substance
• Density can change with temperature and pressure
• Density is irrelevant in fluid mechanics
• Density only applies to solids

What is the unit of density in the SI system?

• kg/m
• kg/m²
• kg/m³
• g/cm³