NEW
Font size
WorksheetsChemistry of Hydrosphere
Total questions: 15
Worksheet time: 5mins
The percentage occurrence of the earth’s water in glaciers and ice caps is about
30.1%
68.7%
96.5%
. 2.75%
The greater concentration of electrons around the nucleus of the oxygen than around the hydrogen is due to its
polarity
electronegativity
bond length
atomic radius
The critical temperature and pressure of water
0 K, 1 atm
273 K, 1 atm
647 K, 218 atm
647oC, 218 atm
It is a special mix of temperature and pressure where the difference between liquid and gas ceases to exist.
Critical point
Saturation point
melting point
boiling point
Specific heat is a water quality which is important for several reasons except:
It regulates the rate at which air temperature changes
Aquatic organisms face less temperature variation than terrestrial organisms.
The structure of liquid water changes at high pressures.
Water is used in cooling systems found in cars and industrial plants.
This is a result of the tendency of water molecules to attract to one another, or cohere, at the surface of any accumulation of water.
Surface tension
Heat capacity
Heat capacity
density
Yellow wavelengths are absorbed in about
First meter
First 10 meters
first 20 meters
first 30 meters
Sound travels faster in water compared with air
because water particles are packed in more densely
Because of the visible wavelength of the sunlight
Because of the attraction of water molecules to another substance
None of the above
Which of the following is an example of point source of water pollution?
Flooding during rainy season which carries waste deposits into our waters.
oil spillage
pesticides
Industrial waste is dumped into our waters.
A water contaminant which is a sediment or organic material suspended in the water of lakes, rivers, and streams from soil erosion.
Physical
Chemical
biological
organic
Common types of ground water contaminants are the following except
Cesspool
septic tank
privies
chemical fertilizers
Distillation is an example of purification of water in
Large scale
medium scale
small scale
none
Ozone
It is the strongest oxidant/disinfectant available.
it is the most common cost-effective means of disinfecting water.
It is most typically generated from a low pressure or a medium pressure lamp.
all the above
It is the removal of suspended solids by passing wastewater through settlement of flotation tanks
Pre- treatment
Primary treatment
secondary treatment
tertiary treatment
The complete cycle of water treatment
Flocculation, sedimentation, filtration, disinfection, storage
Coagulation, sedimentation, filtration, disinfection, storage
Coagulation, filtration, sedimentation, disinfection, storage
Flocculation, filtration, sedimentation, disinfection, storage
