Unit 203: Ppt 3 Scientific principles

Multiple Choice

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

• Newton (N)

• Pascal (Pa)

• Metres per second (m/s)

• Litres per second (l/s)

Multiple Select

Which of the following statements are correct based on the table and diagram about pressure and head height?

• The greater the head, the greater the pressure.

• Pressure is independent of head height.

• A head of 10 meters corresponds to 100 kPa.

• A bar is always equal to 10 kPa.

Multiple Choice

What is the value of atmospheric pressure at sea level, and how does it change above and below sea level?

• 101.3kPa; increases above sea level and decreases below sea level

• 101.3kPa; increases below sea level and decreases above sea level

• 100kPa; increases above sea level and decreases below sea level

• 100kPa; increases below sea level and decreases above sea level

Multiple Choice

Which of the following statements about the pressure at points A and B in the siphon diagram is correct?

• Pressure at A is above atmospheric pressure, pressure at B is below atmospheric pressure.

• Pressure at A is below atmospheric pressure, pressure at B is above atmospheric pressure.

• Both A and B are at atmospheric pressure.

• Pressure at A and B are equal.

Multiple Choice

Which of the following changes occur when the diameter of a garden hose is reduced?

• Speed increases, pressure and flow rate decrease

• Speed decreases, pressure and flow rate increase

• Speed increases, pressure increases, flow rate decreases

• 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 Select

Select all the factors that can increase the resistance to water flow in a pipe system.

• Adding more elbows

• Using smaller pipe diameter

• Increasing pipe length

• Using smoother pipe material

Multiple Choice

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

• Remove elbows and increase pipe diameter

• Add more valves and decrease pipe diameter

• Use rougher materials and add constrictions

• Decrease pipe length and add elbows

Fill in the Blank

The total resistance of a pipe system using 5 elbows, 1 check valve, and 4 sections of 0.5m pipe plus 2m and 1m straight sections is ___ m.

Multiple Choice

What are the SI units for velocity, acceleration, flow rate, force, and pressure as used in the context of water flow?

• Velocity: m/s, Acceleration: m/s², Flow rate: l/s or l/m, Force: N, Pressure: Pa

• Velocity: km/h, Acceleration: m/h², Flow rate: ml/s, Force: kg, Pressure: bar

• Velocity: cm/s, Acceleration: cm/s², Flow rate: l/h, Force: g, Pressure: atm

• Velocity: m/min, Acceleration: m/min², Flow rate: l/h, Force: J, Pressure: psi