hygiene part 3

Special wastes implied in soil pollution can be considered:

• farmyard manure

• household wastes

• fodder leftovers

• residues generated by hospitals, diagnosis and research facilities

• deep litter (bedding) from germ-free animal shelters

The presence of Cl. perfringens (perfringens bacteria) in the soil and the lack of E. coli shows:

• an older or previous pollution

• a recent contamination

• doesn't indicate soil pollution

• indicate water radioactivity

• the infestation degree with parasitic elements

In autumn or in spring, the soil self-purification process:

• lasts 5 days

• lasts 10 days

• lasts 60 days

• stops

• lasts 24 hours

In animal husbandry, water:

• has only a biological role - as nutrient

• has ecological and saprobic role

• has biological role and technological role

• has ecologic role and toxicologic role

• doesn't have any role

From the total amount of water covering the Earth, the atmospheric water represents:

• 2.15%

• 3%

• 0.01%

• 97.2%

• 50%

From the total amount of water covering the Earth, the sea and ocean water represents:

• 2.15%

• 3%

• 0.01%

• 97.2%

• 50%

From the world resource, fresh water used in industry represents a percent of:

• 90%

• 5%

• 1%

• 70%

• 25%

World Health Organization states that the biologic water need is:

• 5 l / day / citizen

• 100 l / day / citizen

• 20-70 l / day / citizen

• 200 cc / day / citizen

• 5 cm / day / citizen

The third (the last) moment in rainwater pollution is:

• eutrophication

• when precipitations are forming on condensation nuclei

• when touching the ground (the soil)

• when precipitation falls (atmosphere washing)

• when is collected and used without processing as drinking water source

Among flowing water bodies (streams), torrents can be described as:

• permanent

• accidental

• artificial channels

• rivers

• intermittent