6035 Level 2 Dip. in Plumbing Unit 203 Scientific Principles

Water is at its most dense when it is at a temperature of

• 0^oC

• 4^oC

• 60^oC

• 100^oC

The SI unit for pressure is

• Psi

• Pc

• Pa

• Pal

which of the following has the highest pressure reading

• 3 bar

• 60 metre head

• 500 N

• 200 kPa

Electrolytic action can only take place in the presence of which of the following

• electricity

• an electromagnet

• electronics

• an electrolyte

which of the following is the best conductor of heat

• plywood

• cast iron

• polypropylene

• rock wool

Calculate the fuse size required for a 1000 W power drill fed from a 230 V supply

• 2 Amp

• 3 Amp

• 4 Amp

• 5 Amp

An immersion heater transfers the heat it creates to the water in a cylinder by

• conduction

• convection

• radiation

• inversion

What is the temperature of 'absolute zero'

• 0^oC

• 0^oF

• 0⁰K

• -1^oC

For a substance to float on water it must have a relative density of less than

• 0.5

• 1.0

• 2.0

• 5.0

During electrolytic action the

• anode will gradually destroy the cathode

• electrolyte will destroy the cathode

• electrolyte will be used up and disappear

• cathode will gradually destroy the anode