GMJ 6035 Scientific

Water is at its maximum density at what temperature?

• 100 degrees

• 25 degrees

• 4 degrees

• 0 degrees

The pascal can be expressed in units of:

• Kg/m3

• N/m2

• Kg/L

• N/kg

Which of the following has the highest coefficient of linear expansion?

• Low carbon steel

• Copper

• PVCu

• Sheet lead

How much heat is required to raise 15kg of water from 20 to 60 degrees if the specific heat capacity of water is 4.2kj/kg/degrees Celsius?

• 1225kj

• 2520kj

• 3657kj

• 5252kj

Which of the following metals is the best conductor of heat?

• Copper

• Low carbon steel

• Lead sheet

• Cast iron

A combination boiler requires a minimum incoming water pressure of 0.8 bar to work correctly. What is this expressed in metres head of water?

• 1 metre

• 5 metres

• 8 metres

• 15 metres

The rate of galvanic corrosion between two dissimilar metals in the presence of water will be dependent on:

• The density of the two metals

• Their relative positions in the electromotive series

• The space between the atoms in each metal

• The level of hardness of the water

The relative density of a substance is

• The pressure exerted by 1m head of water

• The weight of a substance per metre squared

• Its comparison to the density of water

• Its comparison to the volume of water

The intensity of pressure at a 15mm bib tap supplied from a storage cistern creating 5m head of water is:

• 21.98

• 49.05

• 74.32

• 100.27

In order for siphonage to occur, the container receiving the water must be sited:

• At the same height as the container from which water is drawn

• Above the container from which the water is drawn

• Below the container from which the water is drawn

• Inside the container from which the water is drawn