Unit 203: Scientific principles Power Point 3

Multiple Choice

Which of the following is the correct SI unit for pressure?

• Newton (N)

• Pascal (Pa)

• Litre per second (l/s)

• Metres per second (m/s)

Multiple Choice

Which of the following best describes the difference between velocity and acceleration?

• Velocity is the rate at which an object changes its position, while acceleration is the rate at which velocity changes.

• Velocity is the force per area, while acceleration is the amount of fluid flowing through a pipe.

• Velocity is the gravitational pull, while acceleration is the influence on an object to move.

• Velocity is the amount of fluid flowing, while acceleration is the speed of water.

Multiple Choice

Which of the following is the correct formula for calculating pressure?

• Pressure = Force / Area

• Pressure = Area / Force

• Pressure = Force x Area

• Pressure = Velocity / Acceleration

Multiple Select

Select all statements that are correct based on the table and diagram:

• As the meters head increases, the pressure in kilopascals increases.

• A bar value of 1.0 corresponds to a meters head of 10.

• A meters head of 5 corresponds to a kilopascal value of 100.

• The greater the head, the lower the pressure.

Multiple Choice

What is the value of atmospheric pressure at sea level?

• 101.3kPa

• 100kPa

• 120kPa

• 98kPa

Multiple Select

Which of the following statements are correct about the siphonic action shown in the beaker diagram?

• The lower beaker has greater pressure because it is lower.

• Both cisterns have atmospheric pressure acting on them.

• Water flows from beaker B to beaker A.

• Suction at point C initiates the flow.

Multiple Choice

If you reduce the pipe diameter in a garden hose, what happens to the speed, pressure, and flow rate of the water?

• Speed increases, pressure and flow rate decrease.

• Speed decreases, pressure and flow rate increase.

• Speed increases, pressure increases, flow rate increases.

• Speed decreases, pressure decreases, flow rate increases.

Multiple Choice

Which of the following factors does NOT affect the flow rate of water through a pipe?

• Pipe color

• Pipe size

• Pressure

• Frictional resistance

Multiple Choice

If an appliance requires an increase in flow rate, what two changes to the pipework can be made to achieve this?

• Remove elbows and increase pipe diameter

• Add more valves and decrease pipe diameter

• Use smaller pipes and add more elbows

• Increase frictional resistance and add constrictions

Multiple Choice

What is the SI unit for pressure?

• Newton (N)

• Pascal (Pa)

• Litre per second (l/s)

• Metre per second (m/s)