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OHS611S - OCCUPATIONAL HEALTH AND SAFETY 2A - 2ND OPP - JULY 2022 |
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nAm I Bl A un IVERSITY
OF S.CIEnCEAno TECHnOLOGY
FACULTYOF HEALTH,APPLIEDSCIENCESAND NATURALRESOURCES
DEPARTMENTOF HEALTHSCIENCES
QUALIFICATION:BACHELOR OF ENVIRONMENTAL HEALTH SCIENCES
QUALIFICATIONCODE: 08BOHS
LEVEL: 6
COURSECODE: OHS611S
COURSENAME: OCCUPATIONAL HEALTH AND SAFETY2A
SESSION:
JULY, 2022
PAPER:
THEORY
DURATION: 3 HOURS
MARKS:
100
SUPPLEMENTARY/SECONDOPPORTUNITYEXAMINATION QUESTIONPAPER
EXAMINER(S) MR JOSHUA HIDINWA
MODERATOR: MR IMANUEL ZERIAPI
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLEMATERIALS
NONE
THIS QUESTION PAPERCONSISTSOF 5 PAGES(Including this front page)
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SECTION A (30 MARKS)
QUESTION 1
(10 MARKS)
Select the best answer
1.1 The sound level of one machine is 90 dB(A). A second identical machine
also producing 90 dB(A) is installed next to it. What is the sound level when both
machines are running:
(1)
A. 180 dB(A)
B. 135 dB(A)
C. 93 dB(A)
D. 87 dB(A)
1.2 Which of the following is not a type of ionizing radiation?
(1)
A. Gamma rays
B. X-rays
C. Beta rays
D. Ultra violet radiation
1.3 The part of the eye that is responsible for colour perception:
(1)
A. Conjunctiva
B. Rod cells
C. Lens
D. Cone cells
1.4 The human ear is most sensitive to which of the following sound
frequency ranges?
(1)
A. 5 to 5 000 Hz
B. 20 to 20 000 Hz
C. 2 to120 KHz
D. 500 to 6 000 Hz
1.5 A factory with water-borne reticulated sewerage system employs 560 workers. In
terms of the regulations relating to the health and safety of employees at work,
what is the minimum number of toilets the employer should provide to comply? (1)
A. 56
B. 22
C. 11
D. 21
1.6 Effects of whole body vibration include all the following except:
(1)
A. Impotence
B. Increased heart rate
C. Increased blood pressure
D. Lower back pain
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1.7 The gas laws best explain hyperbaric environments where the
mount of gas dissolving in blood and body tissues increases due to
increased partial pressure is:
(1)
A. Boyle's Law
B. Henry's Law
C. Dalton's Law
D. Charles's Law
1.8 The condition where the body is deprived of oxygen at high altitude, low
pressure conditions is known as:
(1)
A. Hypoxia
B. Dysbarism
C. Decompression sickness
D. Barotraumas
1.9 The terms that describe radiation effects that are determined
by the level of radiation dose the person is exposed to:
(1)
A. Probabilistic effects
B. Stochastic effects
C. Collective Dose effect
D. Deterministic effects
1.10 The following ionizing types has the shortest range
(i.e. travels the shortest distance in exposed tissue) for the same initial energy: (1)
A. Alpha particle
B. Beta particle
C. Gamma rays
D. X-rays
QUESTION 2
(10 MARKS)
2. Indicate which statement is true and which one is false.
2.1 Ultra violet radiation can cause skin cancer (melanomas) in exposed workers.
(1)
2.2 An increase in the number of red blood cells is a form of adaptation
for people who live or work in high altitudes.
(1)
2.3 Cooling of the body through evaporation is reduced when the air is
saturated with moisture.
(1)
2.4 Once a worker is acclimatized to heat stress, the worker can maintain
that status for the rest of his working life.
(1)
2.5 Filter A weighting is used in occupational noise measurements because it responds
to noise in a similar manner as the human ear.
(1)
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2.6 Hyperthermia is a condition resulting from the body's exposure to extreme
cold environment resulting in the body temperature falling below 35°C.
(1)
2.7 Visual acuity describes the ability of the eye to adjust to a dark or light environment.
(1)
2.8 In terms of the Namibian Health and Safety regulations, it is mandatory/ compulsory
for anyone handling, manufacturing, selling or storing chemicals
to provide Material Safety Data Sheets for the chemical substances.
(1)
2.9 When dealing with noise, an increase of 3dB will result in the doubling of
sound energy.
(1)
2.10 A health and safety representative can legally be held jointly liable with the
Chief Executive Officer for the company's health and safety negligence.
(1)
QUESTION 3
(10 MARKS)
3.0 Match the terms in Column A with the most appropriate phrase or description in Column B.
Column A
3.1 Luminance
3.2 Audiometric
test
3.3 Glare
3.4 Bradypnoea
3.5 Tinnitus
3.6 Illumination
3.7 Octave Band
Analyser
3.8 Heat stroke
3.9 Physical half
life
3.10 Hypothermia
Column B
A Reduction of breathing rate to below 12 breaths per
minute.
B Ringing or buzzing noise in ears following exposure to
high noise levels.
C The luminous flux that strikes a unit area.
D Thermoregulatory failure resulting in core body
temperature rising over 41 °c.
E Condition in which the core body temperature drops to
below the required or normal body temperature due to
cold stress.
F Brightness within the field of vision exceeding the
general level of brightness.
G Amount of light reflected by a unit area surface. Also
known as brightness.
H Period required for one half of a radioactive material to
decay.
I Checks for hearing threshold shift or loss in persons
exposed to noise.
J Sound frequency analysis.
Marks
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
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SECTION B (20 MARKS}
QUESTION 4
4.1 Elaborate on the scope as well as the exceptions coverage of the Labour
Act. No. 11 of 2007.
{15 MARKS)
[5]
4.2 In terms of the Labour Act and regulations applicable in Namibia, outline the
procedure and criteria for selecting health and safety representatives in the workplace. (5)
4.3 Summarize the duties and rights of health and safety representatives.
(5)
QUESTION 5
(5 MARKS)
5.0 There are two types of vibration, hand-arm vibration (HAV) and whole body vibration
(WBV). Exposure to HAV can lead to health effects commonly referred
to as Hand-Arm Vibration Syndrome (HAVS).
5.1 What are the causes of HAVS? Give examples of three work tasks or
equipment that may contribute to HAVS.
(5)
SECTION C (50 MARKS}
QUESTION 6
(20 MARKS)
6.1 Name ten of Occupational Health and Safety Legal framework applicable in Namibia. [10]
6.2 Describe the measures you would take to improve and ensure good
lighting (illumination) in the workplace.
(10)
QUESTION 7
{20 MARKS)
7.1 How is acclimatization of workers in hot environments normally achieved?
(15)
7.2 Outline the control measures you would recommend to prevent and control of HAVS.
(5)
QUESTION 8
(10 MARKS)
8.1 Hearing loss is mostly at the frequency range of 4000 Hz and above, elaborate on the
advise you would give to the management on the action they should take
regarding the control of noise.
(10)
End of Examination paper
TOTAL: 100 MARKS
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