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BSC410S - BASIC SCIENCE - 2ND OPP - JULY 2022 |
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NAMIBIA UNIVERSITY
OF SCIENCE AND TECHNOLOGY
FACULTY OF HEALTH, APPLIED SCIENCES AND NATURAL RESOURCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: VARIOUS
QUALIFICATION CODE: VARIOUS
COURSE NAME: BASIC SCIENCE
SESSION: JULY 2022
DURATION: 3 HOURS
LEVEL: 4
COURSE CODE: BSC410S
PAPER: THEORY
MARKS: 100
EXAMINER(S)
MODERATOR:
SUPPLEMENTARY/SECOND OPPORTUNITY EXAMINATION
MR PETRUS PAULUS, MS MARY MUTWA, MR ERASUTUS TOBIAS, MR VAINO
INDONGO AND MR EMMANUEL EJEMBI
PROF HABAUKA KWAAMBWA
INSTRUCTIONS
1.
Write all your answers in the answer booklet provided, using black/blue ink pen only.
2.
Read the whole question before answering.
3.
Begin each question on a new page.
4.
The Periodic Table is attached at the back of this question paper.
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PERMISSIBLE MATERIALS
1. Examination script
2. Scientific Calculator
THIS QUESTION PAPER CONSISTS OF 14 PAGES
(INCLUDING THIS FRONT PAGE AND PERIODIC TABLE)
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SECTION A: BIOLOGY
QUESTION 1: MULTIPLE CHOICES. Each correct answer carries 2 marks.
[35]
[20]
1.1 Which two of the following are the features used by microorganisms for movement?
(2)
A. Cilia and Legs
B. Flagella and Legs
C. Cilia and Fins
D. Flagella and Cilia
1.2 Which two domains are prokaryotic?
(2)
A. Protista and Archaebacteria
B. Eubacteria and Archaebacteria
C. Fungi and Plantae
D. Bacteria and Archaea
1.3 Dioecious are
.
(2)
A. Organisms that cannot reproduce sexually.
B. Plants that have male flowers on one plant and female flowers on another plants.
C. Plants that have male and female reproductive part on different locations on the same
plant.
D. Plants that produce leaves throughout the year.
1.4 The two types of competitions found in ecology are:
(2)
A. Endoparasites and Ectoparasitic competition.
B. Interspecific and Endospecific competition.
C. Intraspecific and interspecific competition.
D. Ectospecific and Endospecific competition.
1.5 Detritivores/Scavengers refers to
.
(2)
A. Organisms that feed both on plants and animals
B. Organisms that end the food chain or food web
C. Organisms that feed on tissues of dead organisms
D. Organisms that are not required in the ecosystem
1.6 Components of the ecosystems that are essentially indispensable to its smooth functioning
are
.
(2)
A. Biotic and Abiotic factors
B. Producers and the Sun
C. Producers and Decomposers
D. Primary and Secondary consumers
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1.7 Micronutrients are dietary components often referred to as
A. fats and vitamins
B. vitamins and minerals
C. amino acids and vitamin C
D. carbohydrates and lipids
.
(2)
1.8 Vitamins that are non-toxic to the body when taken in excessive amount are
A. Vitamin B and D
B. Vitamin C and K
C. Vitamin A and K
D. Vitamin B and C
. (2)
1.9 Biotechnology is defined as
.
(2)
A. the study of industrialization
B. the use of living organisms and bio-processes to make products of interest
C. the study of innovation and technology
D. none of the above
1.10 What is the significance of temperature on fermentation during the production yogurt? (2)
A. Fermentation work best at the optimal temperature of the microorganisms being used.
B. Temperature has no significance on any part of the processes of yogurt production.
C. Temperature makes the yogurt hard and thick.
D. Fermentation has nothing to do with temperature.
QUESTION 2 Structured questions
[15]
2.1 Discuss how a scientific name is written following the principles of the binomial
nomenclature system.
(2)
2.2 Explain why producers and decomposers are absolutely essential to the functioning of an
ecosystem?
(2)
2.3 Briefly explain three factors that cause organisms to become endangered or extinct.
(3)
2.4 One of the health benefits of feeding on yoghurt is that it boosts the immune system. Brief
explain how yogurt helps to boost the immune system?
(3)
2.5 Discuss the effects of omitting pasteurization during yoghurt production.
(2)
2.6 Define fermentation and explain it role in the production of gasohol?
(3)
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SECTION B: CHEMISTRY
[35]
QUESTION 3: MULTIPLE CHOICES. Each correct answer carries 1 mark.
[20]
3.1 How many significant figures does the measurement 0.0002500 m have?
(1)
A. Two
B. Four
C. Seven
D. Five
3.2 The factor 10° corresponds to which prefix?
(1)
A. Mega
B. Micro
Cc. Milli
D. Nano
3.3 The value of 100°C is equal to
(1)
A. -373 K
B. 273K
C. 73K
D. 373K
3.4 What is 0.000058 written in scientific notation?
(1)
A. 5.8x 10°
B. 5.8x10°
C. 5.8x10°
D. 5.8x 10°
3.5 Imm is equal to
A. 1x10?m
B. 1x10°cm
C. 1x107dm
D. 1x10* km
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3.6 A change in one or more substances, caused by a chemical reaction, which forms new and
different substances.
(1)
A. Chemical property
B. Chemical reaction
C. Chemical element
D. Chemical change
3.7 What is a pure substance that cannot be broken down into other substances by chemical or
physical means?
(1)
A. Element
B. Substance
C. Mixture
D. Compound
3.8 Which of the following defines matter?
(1)
A. anything without mass
B. anything with mass and takes up space
C. anything with mass, but doesn't take up space
D. anything without mass and doesn't take up space
3.9 What is an Intensive property?
(1)
A. A property that cannot be used to identify a substance
B. A property that depends on the amount of matter present
C. A property that does not depend on the amount of matter present
D. A property that can be observed or measured without changing the identity or
composition of substance
3.10 Which one of the following pairs of separation techniques will BOTH separate salt from a
mixture of salt and water?
(1)
A. Separating funnel and filtration
B. Chromatography and evaporation
C. Separating funnel and distillation
D. Distillation and evaporation
3.11 Which group does the element with atomic number 35 belong to?
(1)
A. Halogens
B. Alkaline earth metals
C. Noble gases
D. Alkali metals
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3.12 Which substance has an overall charge of 1- ?
(1)
A. Lithium
B. Fluorine
C. Potassium
D. Sulfur
3.13 Which is not a family of the periodic table?
(1)
A. alkaline-earth metals
B. anions
C. halogens
D. noble gases
3.14 Which element is a semiconductor?
(1)
A. carbon
B. sodium
C. silicon
D. uranium
3.15 Which particle has a negative charge?
(1)
A. proton
neutron
neuron
electron
3.16 What do we call a substance that changes colors in acids or bases?
(1)
Indicator
Reactant
Developer
Product
3.17 In universal indicators, a pH of7 is shown with
(1)
A. Yellow color
B. Green color
C. Blue color
D. Pink color
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3.18
indicator is pink in alkalis
(1)
Methyl red
Methyl Orange
Bromothymol blue
Phenolphthalein
3.19 Acid reacts with metal to form___
(1)
A. Salt + Hydrogen
B. Salt + Water
C. Salt + Water + Carbon Dioxide
D. Salt + Carbon Dioxide
3.20 According to the Br@nsted-Lowry theory, an acid is any species that can
(1)
A. Donate a proton
B. Accept a proton
C. Donate an electron
D. Accept an electron
QUESTION 4: Brief statement responses.
[15]
4.1 Carry out the following calculation and give the answer with the correct number of
significant figure:
(527.112 + 13)/63.498
(2)
4.2 Use the dimensional analysis method to carry out the following conversion:
(1)
a) 28.0 m to km
4.3 Determine whether each of the following statements is true or false. If false, correct or state
why the statement is false.
(5)
a. Elements in the same group have the same number of valence electrons and have similar
chemical properties.
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b. The group number determines the number of electronic shells around a nucleus while the
period number determines the number of valence electrons.
c. Hydrogen is a monoatomic, reactive gas which is classified with the group 1 (alkali metals)
elements
4.4 List any 3 uses of washing soda.
(3)
4.5 Use your knowledge of atomic calculations to complete the following table.
Note: Symbol — mass 1. Flement™ charge
Note each answer carries half a mark
(4)
Symbol
(a)
(b)
SBT
Protons
15
(c)
35
Neutrons
16
(d)
45
Electrons
(e)
10
(f)
Mass
(g)
24
80
number
Net Charge
0
+2
(h)
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SECTION C: PHYSICS
[30]
QUESTION 5: Brief statement responses.
[20]
5.1
must be drawn with reference to 360°?
(1)
A. Histogram
B. Pie Chart
C. Line graph
D. Smooth curved line
5.2 Force (F) applied on an object of mass (M) is given by F = Ma, where ais the acceleration of
the object. If a graph of F against a is linear, what would the value of F — intercept be if a = 0?
(1)
5.3 Usually it is best to fit a straight line that goes as near as possible to
A. as many points
B. one point
C. two points
D. three points
as possible.
(1)
5.4 Burning of fuel — heat water to make steam — --------------- — turbines turn generators
electrical power sent around the country. Which term is missing in the sequence?
(1)
A. turbine turns the team
B. generators turns the turbine
C. heat water to make smoke
D. steam turns turbine
5.5 In geothermal energy,
produced from underground rocks is used to drive turbines,
which drive electric generators to produce electricity.
(1)
A. water
B. heat
C. dust
D. fire
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5.6 Which of these below is an equation for kinetic energy
(1)
A.
KE = mgh
B.
KE = =mgh
C.
KE = Smv?
D.
None of these
5.7 What is the formula for calculating power?
(1)
A. Power = Force xX distance
B. Power = force
mass
C.
Power
=
mass
force
D. Power= Force xXVelocity
5.8 You drop a 20 kg bag of sugar from the edge of a building at a height of 4 m. How much work
did you do? Taking acceleration due to gravity g = 9.8 m/s’.
(1)
A. + 800J
B. - 800J
C. + 390J
D. - 160J
5.9 What would be the resultant force if applied forces are 10 N and 15 N as shown by the free
body diagram below, respectively?
10N
Lneeteetnnn esate cnet cena acme aenaemennd
What is the resultant force?
(1)
A. 5N east
10 N east
15 N west
5N west
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5.10 If the fridge of mass 350 kg is moved with force of 70 N. What is the acceleration of the
fridge?
A. 0.2 m/s”
(1)
B. 70 m/s?
Cc. 5m/s?
D. 24500 m/s?
5.11 A neutron and a proton are
(1)
A. nucleons
B. positively charged
C. negatively charged
D. unlike charged
5.12 A proton is a charge which attracts to
(1)
A. neutron
B. anelectron
C. aproton
D. none of the above
5.13
hold quarks together.
(1)
Gravity
Electromagnetic force
Strong nuclear force
Weak nuclear force
5.14 A gas produced by burning fossil fuels and cause ‘greenhouse effect’ is known
as
.
(1)
A. sulphur dioxide
B. natural gas
C. oxygen
D. carbon dioxide
5.15 Which one is a neutral particle of the nucleon?
(1)
A. Proton
B. Atom
C. Electron
D. Neutron
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5.16 Which of the following instruments is used to measure an electric energy?
(1)
A. Voltmeter
B. Galvanometer
C. Ammeter
D. Potentiometer
8.17 A measure of how much energy electrical charges receives is known to be
.
(1)
A. electrical device
B. voltage
C. resistance
D. none of the above
5.18 The successful bombardment of nitrogen atom with alpha particle resulted in the formation
of oxygen nucleus and proton according to the reaction,
$He + 44N > 70+1H
What are the values x, y and z?
(1)
A.x=7,y=14andz=8
B.x=7,y=17andz=8
C.x=8,y=17andz=7
D.x=8, y=14andz=7
8.19 Which one is an electromagnetic radiation with high frequency?
(1)
A. alpha
B. gamma
C. beta
D. None of the above
5.20 The
is the time it takes for half of the original sample of radioactive material to
decay to half its original.
(1)
A. decay rate
B. half-life
C. radioactive decay
D. radioactivity
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QUESTION 6: Structured questions
[10]
6.1 Study the circuit with appropriate electrical components below:
mt
5Q
7Q
Determine:
(i) the resistance in parallel
(2)
(ii) resistance in series
(1)
(iii) The total resistance of the circuit.
(1)
6.2 Match the term in COLUMN A with either renewable or non-renewable energy source in
COLUMN B.
(2)
COLUMN A
COLUMN B
Crude oil
i.
Geothermal
ii.
6.3 Which two types of energy are produced from water?
(2)
6.4 State any two advantages of wind power.
(2)
END
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