EVB302 Exam questions with complete
answers graded A+ updated
What is a point source pollution - correct answer ✔✔is a single identifiable source of pollution
such as a pipe or drain.
What is a non point source of pollution - correct answer ✔✔cannot be attributable to a single
source and occur over a wide area. Example includes agricultural run-off of fertilisers, pesticides
from rainfall or irrigation into a stream body
Define suspended particles - correct answer ✔✔supported by buoyant or viscous forces
Define dissolved particles - correct answer ✔✔molecules or ions that are held by the molecular
structure of water
Why are pathogen indicators used instead of conducting laboratory testing for all significant
waterborne pathogens? - correct answer ✔✔Direct detection of pathogens is not feasible for
routine assessment as they occur intermittently and are difficult to recover and test for
accurately. Therefore indicator mirco organisms are used as they are easily detected and
enumerated
What is an example of a commonly used pathogen indicator - correct answer ✔✔Ecoli
Colloidal particles - correct answer ✔✔Small particles. Technically suspended but exhibiting
characteristics of dissolved substances
Positive Ion - correct answer ✔✔When an atom loses an electron (+charge) it has more protons
than electrions
, Cation- normally metals Na+
Negative ion - correct answer ✔✔When an atom gains an electron (-charge) it will have more
electrons than protons.
Anion- normally non-metals Cl
Compound - correct answer ✔✔Cation+Anion
Ionic bond Na+Cl
Biological Oxygen Demand BOD - correct answer ✔✔Amount of dissolved oxygen required by
aerobic biological organisms to break down organic material a water sample.
Pathogens - correct answer ✔✔Bacteria, virus or microorganisms that causes disease
Water Quality: physical parameters - correct answer ✔✔Temp
pH
TDS
TSS
EC
Turbidity
Colour
Odour
Water Quality: Chemical parameters - correct answer ✔✔BOD
DO
Alkalinity
answers graded A+ updated
What is a point source pollution - correct answer ✔✔is a single identifiable source of pollution
such as a pipe or drain.
What is a non point source of pollution - correct answer ✔✔cannot be attributable to a single
source and occur over a wide area. Example includes agricultural run-off of fertilisers, pesticides
from rainfall or irrigation into a stream body
Define suspended particles - correct answer ✔✔supported by buoyant or viscous forces
Define dissolved particles - correct answer ✔✔molecules or ions that are held by the molecular
structure of water
Why are pathogen indicators used instead of conducting laboratory testing for all significant
waterborne pathogens? - correct answer ✔✔Direct detection of pathogens is not feasible for
routine assessment as they occur intermittently and are difficult to recover and test for
accurately. Therefore indicator mirco organisms are used as they are easily detected and
enumerated
What is an example of a commonly used pathogen indicator - correct answer ✔✔Ecoli
Colloidal particles - correct answer ✔✔Small particles. Technically suspended but exhibiting
characteristics of dissolved substances
Positive Ion - correct answer ✔✔When an atom loses an electron (+charge) it has more protons
than electrions
, Cation- normally metals Na+
Negative ion - correct answer ✔✔When an atom gains an electron (-charge) it will have more
electrons than protons.
Anion- normally non-metals Cl
Compound - correct answer ✔✔Cation+Anion
Ionic bond Na+Cl
Biological Oxygen Demand BOD - correct answer ✔✔Amount of dissolved oxygen required by
aerobic biological organisms to break down organic material a water sample.
Pathogens - correct answer ✔✔Bacteria, virus or microorganisms that causes disease
Water Quality: physical parameters - correct answer ✔✔Temp
pH
TDS
TSS
EC
Turbidity
Colour
Odour
Water Quality: Chemical parameters - correct answer ✔✔BOD
DO
Alkalinity
