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WAS512S - WATER AND SANITATION - 1ST OPP - NOVEMBER 2023 |
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·~· nAmlBIA UnlVERSITY
OF SCIEnCE AnDTECHnOLOGY
FacultyofHealthN, atural
ResourceasndApplied
Sciences
Schoolof HealthSciences
DepartmentofPreventative
HealthSciences
13Jackson KauJeuaStreet
Private Bag 13388
Windhoek
NAMIBIA
T: +264 612072970
F: +264612079970
E: dphs@nust.na
W:www.nust.na
QUALIFICATION: BACHELOR OF ENVIRONMENTAL HEALTH SCIENCES
QUALIFICATIONCODE: 08BOHS
LEVEL:5
COURSE:WATER AND SANITATION
COURSECODE: WAS512S
DATE: NOVEMBER 2023
SESSION: 1
DURATION: 3 HOUR
MARKS: 100
EXAMINER:
MODERATOR:
FIRST OPPORTUNITY: QUESTION PAPER
MRS MOUYELELE HAUF/KU
MS CHARMAINE JANSEN
INSTRUCTIONS:
1. Answer all questions on the separate answer sheet.
2. Please write neatly and legibly.
3. Do not use the left side margin of the exam paper. This must be allowed for the
examiner.
4. No books, notes and other additional aids are allowed.
5. Mark all answers clearly with their respective_question numbers.
PERMISSIBLE MATERIALS:
1. Non-Programmable Calculator
ATTACHEMENTS
1. None
This paper consists of 4 pages including this front page
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--7 =SE=CT~IO:c..:.N-=-A=:'=S=H=O;::.:R:..:..T-'--A:.:...;N=S-=..:W:.:E:.:..:.R--=Q=U=E=ST.:..:l=O.:..:N=S---=-::==========-a
QUESTION 1
rsMARKS] -
1.0 Classify the following diseases as water-borne, water-washed, water-based
and water- related
1.1 Typhoid fever
[1]
1.2 Conjunctivitis
[1]
1.3 Louse borne typhus
[1]
1.4 Schistosomiasis
[1]
1.5 Dengue fever
[1]
QUESTION2
2.0 Interpret the following abbreviations in the context of water and sanitation
2.1 WASH
2.2 CLTS
2.3 MAWF
2.4 VIP
2.5 WHO
[S MARKS) -
[1]
[1]
[1]
[1]
[1]
Water and Sanitation (WAS512S)
l' t Opportunity November 2023
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QUESTION 3
[10 MARKS]
3.0 Match the concepts in Column A to their most correct statement in Column B. Write on your answer
sheet the concept number and the letter representing the correct statement.
1 mark each
No COLUMN A
3.1 Impermeable
3.2 Colloids
3.3 Permeable
3.4 Soak pit
3.5 Helminths
3.6 Palatable water
3.7 Black water
3.8 Sedimentation
3.9 Distillation
COLUMN B
A
A hole dug in the ground serving as soak away
B
Not allowing passage of a liquid.
C
Water that is pleasant to drink because its taste is good but it
may not be safe to drink.
D
Parasitic worm that grow and multiply in sewage and wet soil
E
Able to be passed through or penetrated by a fluid.
F
Water is heated to steam, which is then cooled and collected as
liquid, leaving behind micro organisms
G
It is also called clarification
H The means of collecting and disposing of excreta and
community liquid waste in a hygienic ways as not to endanger
the health of individuals.
I
Disturbed, muddy appearance of water.
3.10 Turbidity
J
These are low diameter particles which are responsible for the
turbidity or the colour of surface water
QUESTION 4
4.0 Differentiate between the following terms:
4.1 Water treatment plant and waste water treatment plant.
4.2 Temporary and permanent hardness of water.
4.3 Shallow well and deep well.
QUESTION 5
5.1 State the five (5) main objective of water treatment.
5.2 Mention any five (5) advantages of ground water.
[10 MARKS]
[6]
[2]
[2]
[10 MARKS]
[5]
[5]
Water and Sanitation {WAS512S)
1st opportunity November 2023
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SECTION B:LONG ANSWER QUESTIONS
Please answer ALL of the questions in this section.
[40 MARKS]
QUESTION 6
[20 MARKS]
6.1 One of the main duties of a water supply provider is to ensure that a safe and plentiful water
supply is available to all segments of a community at a reasonable cost. This may mean seeking
new water sources to satisfy demand. Identifying potential new sources and assessingtheir
viability prior to development is a skilled technical task that requires several different factors to be
assessed. Briefly explain any seven (7) factors to be considered before developing a water source.
[14]
6.2 Outline the methods of preventing water -related insect vector disease or water arthropod
disease.
(6]
QUESTION 7
(20 MARKS]
7.1 Explain why pit latrines are not suitable in areas where the groundwater table is high.
[8]
7.2 On-site sanitation is characterized by the collection and treatment of waste where it is deposited.
7.2.1 Outline any six (6) advantages of on-site sanitation systems.
[6]
7.2.2 Outline any six {6) disadvantages of a septic tank as a common type of
on-site sanitation systems.
(6]
SECTION B: ESSAY QUESTIONS
(20 MARKS]
QUESTION 8
[20 MARKS]
In water treatment, sedimentation, or the removal by gravitational settling of suspended particles
heavier than water, is perhaps the most widely useful operation. The water is allowed to sit in a
large settling tank. The heavier floes settle to the bottom, forming sludge, which is later removed.
This process effectively removes larger suspended particles and some organic matter. Discussthe
factors that influence effective sedimentation processes.
(20]
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END OF THE QUESTION PAPER
Water and Sanitation (WAS512S)
1•1 opportunity November 2023
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