# Viscosity and Flow of Fluids (Grades 11-12)

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## Viscosity and Flow of Fluids

**Instructions:**
Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.

Which property of a liquid describes its resistance to flow?

- plasticity
- viscosity
- elasticity
- incompressibility

2.

The branch of physics that deals with liquids, gases and plasma and the forces acting on them is called .

- dynamical physics
- thermodynamics
- fluid mechanics
- statics

3.

The Reynolds number is defined as the ratio of

- viscosity to density.
- density to viscosity.
- viscous forces to inertial forces.
- inertial forces to viscous forces.

4.

What kind of forces are dominant in turbulent flows?

- inertial forces
- viscous forces

5.

When does laminar flow occur?

- at low Reynolds numbers
- at intermediate Reynolds numbers
- at high Reynolds numbers

6.

What does Bernoulli’s principle state?

7.

The faster a fluid flows, the greater the pressure it exerts.

- True
- False

8.

An ideal fluid is flowing with a speed of 12 cm/s through a pipe of diameter 5 cm. The pipe splits into three smaller pipes, each with a diameter of 2 cm. What is the speed of the fluid in the smaller pipes?

- 4 cm/s
- 12 cm/s
- 25 cm/s
- 75 cm/s

9.

A fluid flows through a pipe of diameter [math]90 mm[/math] with a velocity of [math]10 m/s[/math]. It has a density of [math]1200 (kg)/m^3[/math] and a viscosity of [math]0.8 (kg)/(ms)[/math]. Calculate the Reynolds number and state whether the flow is laminar, turbulent or transitional.

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