WATER SUPPLY

The hydrogen atom of the water molecule has ______ charge.

• Positive

• Negative

• Neutral

• Static

Delayed rise in water temperature before it begins to get hot due to its high _____.

• Specific gravity

• Conductivity

• Specific heat index

• Atomic number

Fresh water achieves maximum density at around _____ degree Celcius

• O

• 4

• 28

• 100

The maximum density of water is ____ g/cm3

• 0.5

• 1

• 4

• 10

The following are major cations in natural water except:

• Ca2+

• Mg+

• K+

• Ni2+

____ is expressed as mg/L CaCO3-

• Acidity

• Alkalinity

• Hardness

• Turbidity

The ____ ion concentrations in water influence its pH level

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

The following statement regarding physical characteristics of water is False

• When water freezes, it expands rapidly adding about 9% by volume

• Chemical and biological reaction rates increase with increasing temperature

• Colour can indicate the pesence of humid substance

• Sweet bitter taste are produced by inorganic compounds

The primary constituent that can cause water hardness is ____

• Magnesium

• Sodium

• Calcium

• Aluminium

Excessive accumulation of ____ in hot water piping affects heat transfer and could lead to plugging

• FeSO4

• CaCO3

• CaSO4

• H2CO3