1. | Which are the components of water disperse system? |
dissolved substances, dissolved gases, radioactive components | |
dissolved and not dissolved substances, gases, microorganisms | |
dissolved and not dissolved substances, gases, microorganisms, radioactive components |
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2. | Which anions and cations form the ionic composition of river waters? |
HCO3-, SO42-, Fe, Cl, Na | |
HCO3-, SO42-, Cl-, Ca2+, Mg2+, Na+ (K+) | |
Ca2+, Mg2+, SO42-, Cl, Na, HCO3- |
Max/Min Score: [2.0/0.0]
3. | Which of the following answers contains all the factors that form the quality of waters? |
climate, vegetation, rockstructure, soils, aquatic organism | |
precipitation and temperature, forest vegetation, rocks and soil | |
precipitation and temperature of the air, soil and plant cover, rocks, vital activity of water organisms |
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4. | Which of the following processes describe the interaction between rocks and sheet flow? |
dissolving, hydrolysis | |
diffusion and convective transportation | |
bioaccumulation, settling |
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5. | In which of the following cases waters in rivers have the lowest mineralization? |
if rainfalls and subsurface waters predominate | |
if snow and glacial feeders predominate | |
if snowfalls and rainfalls predominates and a great amount of subsurface waters |
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6. | Which of the chemical processes is decisive for the pH of river waters and respectively for their quality? |
hydrolysis | |
sorption | |
oxidation-reduction processes |
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7. | What is the role of the phytoplancton for the formation of quality of waters? |
source of not organic substance and CO2 | |
source of organic matter and O2 | |
source of the basic anions and cations |
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