1) What is the SI unit of pressure? a) Newton b) Pascal c) Bar d) PSI 2) What is the formula for pressure? a) Force × Area b) Mass × Acceleration c) Force ÷ Area d) Area ÷ Force 3) What is the acceleration due to gravity? a) 10 m/s² b) 9.81 m/s² c) 1.81 m/s² d) 8.91 m/s² 4) What is the unit of force? a) Pascal b) Kilogram c) Newton d) Joule 5) How much force is exerted by 40 litres of water? a) 392 N b) 400 N c) 981 N d) 40 N 6) What is the pressure if a 392 N force is applied over an area of 0.8 m²? a) 490 Pa b) 392 Pa c) 490 N/m² d) 0.8 Pa 7) Which of the following is NOT a unit of pressure? a) Bar b) PSI c) Litres per second d) Pascal 8) What is the relationship between pipe diameter and velocity? a) Smaller diameter = lower velocity b) Smaller diameter = higher velocity c) Larger diameter = higher velocity d) Diameter has no effect 9) What is the formula for flow rate (Q)? a) Q = A + v b) Q = A ÷ v c) Q = A × v d) Q = v ÷ A 10) What is the area of a 28mm pipe (radius = 0.014m)? a) 0.000615 m² b) 0.00196 m² c) 0.000154 m² d) 0.00046 m² 11) What is the flow rate if the area is 0.000615 m² and velocity is 7.5 m/s? a) 0.0046 m³/s b) 0.0061 m³/s c) 0.0075 m³/s d) 0.0032 m³/s 12) What is the pressure at the bottom of a 9.5m head of water? a) 0.45 bar b) 0.95 bar c) 1.5 bar d) 1.0 bar 13) What causes siphonic action in a WC? a) Gravity b) Atmospheric pressure c) Water temperature d) Pipe diameter 14) What is the resistance equivalent of one elbow in a 15mm pipe run? a) 0.26m b) 0.37m c) 0.5m d) 1.0m 15) Which of the following will reduce flow rate the most? a) Smooth pipe material b) Increased pipe diameter c) Shorter pipe length d) Multiple valves and elbows

Pressure, Force and Flow

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