Which property is defined as the mass of a fluid per unit volume?

• Specific weight

• Density

• Specific gravity

• Specific volume

The SI unit of density is:

• kg/L

• g/cm³

• kg/m³

• N/m³

The density of air can be determined using the ideal gas law as:

• ρ = p/RT

• ρ = RT/p

• ρ = V/m

• ρ = γ/g

Specific weight (γ) of a fluid is given by:

• γ = ρ × g

• γ = V/m

• γ = p/RT

• γ = 1/ρ

The reciprocal of density is called:

• Specific weight

• Specific volume

• Specific gravity

• Compressibility

The specific gravity of a liquid is the ratio of its density to:

• Density of gas

• Density of mercury

• Density of air

• Density of water

If the specific gravity of mercury is 13.6, then its density is:

• 1000 kg/m³

• 13,600 kg/m³

• 136 kg/m³

• 1.36 × 10³ kg/m³

Absolute viscosity (μ) relates shear stress and velocity gradient as:

• μ = τ / (dV/dy)

• μ = τ × (dV/dy)

• μ = ρ × g

• μ = γ × V

Kinematic viscosity (ν) is expressed as:

• ν = μ × ρ

• ν = μ / ρ

• ν = τ / ρ

• ν = 1 / μ

The spherical shape of droplets is due to:

• Viscosity

• Surface tension

• Capillarity

• Compressibility