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BSC410S - BASIC SCIENCE - 2nd OPP - JANUARY 2025 |
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QUALIFICATION: VARIOUS
QUALIFICATION CODE: VARIOUS
COURSE: BASIC SCIENCE
DATE: JANUARY 2025
DURATION: 3 HOURS
LEVEL: 4
COURSE CODE: BSC410S
SESSION: 1
MARKS: 100
SUPPLEMENTARY/SECOND OPPORTUNITY: EXAMINATION PAPER
EXAMINER: Mr Petrus Paulus, Mrs Marta Elvin and Mr Ambicious Lifasi,
Dr Vaino lndongo
MODERATOR: Prof Edosa Omoregie
INSTRUCTIONS:
I. 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 MATERIAL:
Non-Programmable Calculator
ATTACHEM ENT
None
This paper consists of 16 pages including this front page and a Periodic Table
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SECTION A: BIOLOGY
[35]
QUESTION 1
(20)
Question Type: Multiple Choices. Choose and write a letter corresponding to the
correct answer. Each correct answer carries 1 mark.
1.1 Choose the correct statement about how humans fit in with the rest of nature.
A. Humans are a part of an evolutionary process.
B. Humans share the same cellular chemistry with other living things.
C. Humans are a part of the biosphere.
D. All of these are correct.
1.2 Organisms within communities and ecosystems feed on one another to obtain
energy and nutrients. What component does not cycle within an ecosystem?
A. soil nutrients
B. energy
C. plant nutrients
D. components of hard animal structures.
1.3 ______
occurs when organisms try to get the same resources.
A. Predation
B. Competition
C. Parasitism
D. Symbiosis
1.4All of the following are examples of negative symbiosis except;
A. commensalism.
B. competition.
C. predation.
D. parasitism.
1.5 The main function of rennet in the manufacture of hard cheese is to __ .
A. make the milk taste better
B. lower the pH of milk and kill the other lactic acid bacteria
C. lower the pH of milk and form of curds
D. enhance removal of whey so that the cheese can be made more efficiently
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1.6 Unsaturated fats;
A. are more common in animals than in plants
B. have fewer fatty acid molecules per fat molecule
C. are associated with greater health risks than saturated fats
D. have double bonds in their fatty acid chains
1.7 Viruses are assigned to the kingdom;
A. Archaebacteria
B. Eubacteria
C. Protista
D. none of the above
1.8 Fungi digest their food by
A. photosynthesis and then absorbing the small nutrients externally
B. phagocytosis and secreting enzymes onto the food before digestion.
C. releasing digestive enzymes into their food and digesting it externally
D. dissolving food into simpler nutrients and then absorbing the food through
photosynthesis
1.9 What gives yoghurt a sour taste?
A. Lactic acid
B. Sour milk
C. Fermented fruits
D. Complete fermentation
1.1O A starter culture in the food industry is____
_
A. fungi that are used to make food rot so that we can eat the food
B. bacteria that are used in the fermentation of food products
C. a microorganism that is used to control the growth of other organisms
D. a microorganism that can withstand high temperatures and can be used in
fermentation industries
1.11 Which one of the following does NOT explain why there is a decrease in energy
through the trophic levels in an ecosystem?
A. There is an increase in biomass as trophic levels decrease.
B. There is an increase in the number of individuals as trophic levels decrease.
C. Energy is lost as organisms grow older over time.
D. Energy is lost from the processes of respiration and metabolism.
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1.12 Which statement illustrates a biotic factor interacting with an abiotic factor?
A. A sea turtle transporting a pilot fish to a source of food.
B. A rock moving during an earthquake.
C. A plant absorbs sunlight, which is used for photosynthesis.
D. Wind cause waves to form on a lake.
1.13 Two groups are absolutely essential to the functioning of an ecosystem. They are;
A. biotic and abiotic
B. producers and carnivores
C. sun and air
D. producers and decomposers
1.14 Which ecological interaction or symbiotic relation is represented by diagrams I
and II below?
II
A. I) Cooperation
B. I) Cooperation
C. l)Commensalism
D. !)Predation
II) Parasitism
II) Mutualism
Ill) Competition
IV) Parasitism
1.15 The condensation of glucose and fructose will yield _______
_
A. maltose, a disaccharide
B. sucrose, a disaccharide
C. lactose, a polysaccharide
D. sucrose, a polysaccharide
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1.16 Retardation in growth and poor bones development in children is due to the
deficiency of which nutrient and mineral?
A. Carbohydrates and Potassium
B. Proteins and Calcium
C. Fats and Vitamin D
D. Water and Iodine
1.17 Enzymes are secreted by the body to facilitate digestion by breaking bonds
between repeated sugar units. The hydrolysis of maltose will yield __ _
A. glucose and glucose
B. glucose and lactose
C. glucose and fructose
D. glucose and galactose
1.18 Which class of vitamins has the potential of becoming toxic to the body and
why?
A. Vitamin C and B, because they need to be taken in daily.
B. Water-soluble vitamins are they can easily be transported throughout the body.
C. Fat-soluble vitamins when taken in excessive amounts, as they stay longer in the
body.
D. Water -soluble vitamins as they can easily be transported to different body parts
by water.
1.19 Fibre cannot be digested; however, it is an important part of our diet for various
reasons. Identify, which of the following reasons is false?
A. As it remains undigested it passes through the entire gut from mouth to anus and
thus keeps food moving smoothly through our system.
B. It prevents constipation.
C. The fibre absorbs poisonous waste from the digested food.
D. High fibre diets are believed to increase the risk of heart disease, bowel cancer
and cholesterol in the body.
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1.20 What is function of fermentation in the production of yoghurt?
A. to convert lactose to lactic acid which coagulates the milk.
B. to adds sweetness to the yoghurt.
C. to soften the yoghurt.
D. all of the above (A, B & C).
QUESTIQ.ti.2
[15]
Question Type: Structured Questions.
2.1 State SIX characteristics of living things.
(3)
2.2 Given the following information on the classification of the African elephant, write
down its scientific name?
(2)
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Proboscidea
Family: Elephantidae
Genus: Loxodonta
Species: Africana
2.3 Discuss why producers and decomposers are indispensable
functioning of the ecosystem.
2.4 State four important uses of proteins in your body.
in the smooth
(2)
(4)
2.5 Discuss the significance of fermentation in bread and yoghurt production.
(4)
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SECTION B: CHEMISTRY
[35]
QUESTION 3:
(20)
Question Type: Multiple Choices. Choose and write a letter corresponding to the
correct answer. Each correct answer carries 1 mark.
3.1 The density of water can be classified as an;
A. Extensive chemical property
B. Extensive physical property
C. Intensive chemical property
D. Intensive physical property
3.2 A ____ results in a new substance and it cannot be reversed by physical mean.
A. Physical change
B. Chemical change
C. Physical property
D. Chemical property
3.3 What is the correct formula when converting from °F to °C?
A. °C = 1.8 (°F) + 32
oc B. = OF-32
oc 1.8
C. = OF+32
1.8
OF
D. °C=--32
1.8
3.4 One of the following rules DOES NOT apply when determining significant figures.
A. Non-zeros digits always count as significant figures
B. Leading zeros do not count as significant figures
C. Trailing zeros always count as significant figures
D. Captive zeros always count as significant figures
3.5 The below electronic configuration has been derived from;
A. Magnesium (Mg) which has lost 2 electrons
B. Oxygen (0) which has gained 2 electrons
C. Neon (Ne) which has 1O electrons
D. None of the above
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3.6 According to the Bronsted-Lowry's theory
A. An acid requires a base to have OH-
B. An acid is substance that receives a proton
C. An acid is a substance that donates a proton
D. A and Care correct.
3.7 Which statement is correct about the Alkali metals group on the Periodic Table?
A. They have density less than water
B. They are the most reactive metals
C. They form positive charged ions during ionic bonding
D. All of the above
3.8 If concentration
A. Neutral
B. Basic
C. Acidic
D. Aqueous
of Wis equal to 1 x 10-7 then solution is
3.9 Elements in group 1;
A. Will likely gain one electron in their outer shell
B. Will likely lose one electron of their outer shell
C. Can behave as either A or B depending on electrons availability
D. They are inert elements (do not exchange electrons)
3.1 O Sodium hydrogen carbonate is used in the following;
A. Used in drains and oven cleaners
B. Additives in food and drinks
C. As an antacid to relieve indigestion
D. Both A and C
3.11 One of the followings IS NOT a base;
A. NaOH
B. KOH
C. CH3COOH
D. Ca(OH)2
3.12 The mixture of two or more metals is known as;
A. Ore
B. Alloy
C. Metalloid
D. Mineral
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3.13 An element has an atomic number 14, this element belongs in group
___
and period __ _
A. 4, 3
B. 5,2
C. 3,4
D. 2,5
3.14 Magnesium hydroxide is used in the following;
A. Used in toothpaste to neutralize acid
B. Aids in digestion in the stomach
C. As an antacid to relieve indigestion
D. Both A and C
3.15 Physical properties of bases;
A. Turns red litmus paper blue
B. pH less than 7
C. Turns blue litmus paper red
D. pH equal to 7
3.16 How many significant figures does this number have: 104, 000?
A. 2
B. 3
C. 4
D. 6
3.17 How many electrons are in a lead (IV) cation (Pb.4)?
A. 82
B. 78
C. 86
D. 207.2
3.18 How many neutrons
A. 38
B. 50
C. 87
D. 88
are present in the nucleus
of a strontium
(Sr) - 88 isotope?
3.19 Which of these bases is not an alkali?
A. NaOH
B. KOH
C. Ca(OH)z
D. Cu(OH)z
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3.20 A strong base has a pH of __ _
A. 7
B. 5-9
C. 1-3
D. 12-14
QUESTION 4
[15]
Question Types: Brief statement responses.
4.1 Hydrochloric acid is a strong acid. What is meant by a strong acid?
(1)
4.2 Write the following numbers to the CORRECT scientific notation form:
(2)
a) 22.96 X 108
b) 0.728x 105
4.3. Draw the electronic configuration fluorine and calcium ion.
(2)
4.4 Name the products obtained from the following reactions:
(2)
a. Acid +
b. Acid
4.5 Carry out the following operations
significant figures and units.
a) 5.6792 m + 4.33 m + 0.6 m =
b) 3.70 g-2.9133 g =
c) 4.51 cm x 3.6666 cm=
and express each answer to correct
number of
(3)
4.6 Identify the separation techniques used in the following mixtures:
(5)
Mixtures
Rice and water
Water and ethanol
Water and kerosene oil
Salt water
Butter and cream
Separation technique
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SECTION AC: PHYSICS
[30]
QUESTION 5
(20)
Question Type: Multiple Choices. Choose and write a letter corresponding to the
correct answer. Each correct answer carries 1 mark.
5.1 Which of the following is the main purpose of a graph?
A. To show the data clearly
B. To decorate some of the information that may be difficult to express in another
form
C. To compress a large set of data into a form that is clear, manageable and easy to
read
D. To simplify things that are too complex
5.2 The advantage of using a line graph over bar graph is that a line graph can
show ___ _
A. The speed of car A or B
B. Can show how car A accelerates faster than car B
C. The variation between two variables over a given time
D. None of the above
5.3 The following graph is discrete and descriptive.
A. Line graph
B. Bar Graph
C. Histogram
D. Pie chart
5.4 The following sets a line graph apart from a bar graph.
A. The length or height of the bar is equal to the quantity within that category of data
B. Show change over a period of time
C. Composed of discrete bars that represent different categories of data
D. Well descriptive and easily understood
5.5 Which is not correct about a bar graph?
A. The length or height of the bar is equal to the quantity within that category of data
B. Show change over a period of time
C. Composed of discrete bars that represent different categories of data
D. Well descriptive and easily understood
5.6 ___ is Not a Renewable source of energy
A. Geothermal
B. Tidal
C. Biomass
D. None of the above
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5.7The energy produced by the ocean as a result of the movement of water flowing back
and forth is called
A. Geothermal
B. Heat energy
C. Hydroelectric
D. Tidal
5.8 If the acceleration of the body is 10.0 m/s 2, what is the value of a force X in figure
below?
X
A. 30 N
B. 21 N
C. 15 N
D. 10 N
3kg
9N
5.9 __ involves using visual representation
A. Polygon
B. Graph
C. Pyramid
D. None of these
to present data.
5.1 O What is the full meaning of I in the acronym T.A.I.L.S used in constructing a
graph?
A. Intercept
B. lnline
C. Interval
D. None of these.
5.11 Consider the following acronym T.A.I.L.S. Which one is NOT correct?
A. When drawing a graph, an interval is not needed.
B. A title for a graph should be considered.
C. Know which graph you required to draw.
D. The graph should be 2/3 the size of the graph page.
5.12 What is the formula for calculating weight (W)?
A. W=mv
B. W=mt
C. W=mg
D. W=md
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5.13 Which of the following is a fundamental force of nature.
A. Gravity.
B. Vibration
C. Elastic force
D. Frictional force.
5.14 What is resistance?
A. How much electricity flows through a given point
B. None of the above
C. the movement of negative charges (electrons) in a circuit
D. How much electricity is prevented from flowing through a give point
5.15 A measure of how much energy electrons receive is known as;
A. Battery
B. charge
C. resistance
D. Voltage
5.16 If a parallel circuit is opened in the main line, the current __
A. Increases in the branch of the lowest resistance
B. Increases in each branch
C. Is zero in all branches
D. Is zero in the highest resistive branch
5.17 Isotopes of an element have a different number of;
A. Proton
B. Neutron
C. Electron
D. Atom
5.18 The process by which the nuclei of a nuclide emits a photon is known as;
A. Alpha decay
B. Gamma decay
C. Beta decay
D. All the above
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5.19 ___ is not a renewable source of energy.
A. Geothermal
B. Tidal
C. Biomass
D. None of the above
5.20 The energy produced by the ocean as a result of the movement of water flowing
back and forth is called;
A. Geothermal
B. Heat energy
C. Hydroelectric
D. Tidal
QUESTION 6
(10)
Structured questions
6.1 Calculate the resultant force.
(4)
:20 N
40 N
100 N
100 N
100 N
6.2 Determine the current (I) across the circuit in the figure below?
(4)
5.0 V
f
IIII
!
@
l
1.2
0.8
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6.3 Distinguish between half-life and radioactive decay.
(2)
END
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PERIODICTABLEOF THE ELEMENTS
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2
H
1.00794 2
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13
14
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He
16
17 4.00260
8 9 10
Li Be
B C N 0 F Ne
6.941 9.01218
10.81 12.011 14.0067 15.9994 18.9984 20.179
11 12
13 14 15 16 17 18
Na Mg
Al Si p s Cl Ar
22.9898 24.305 3
4
5
6
7
8
9
10
11
12 26.9815 28.0855 30.9738 32.06 35.453 39.948
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
39.0983 40.08 44.9559 47.88 50.9415 51.996 54.9380 55.847 58.9332 58.69 63.546 6538 69.72 72.59 74.9216 78.96 79.904 83.8
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52. 53 54
Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
85.4678 87.62 88.9059 91.22 92.9064 95.94 (98) 101.07 102.906 106.42 107.868 112.41 114.82 118.69 121.75 127.6 126.9 13I .29
55 56 71 72 73 74 75 76 77 78 79 80 81
Cs Ba Lu Hf Ta w Re Os Ir Pt Au Hg Tl
132.905 137.33 174.967 178.49 180.948 183.85 186207 190.2 192.22 195.08 196.967 200.59 204383
87 88 103 104 105 106 107 108 109 110 111 112
Fr Ra Lr Rf Db Sg Bh Hs Mt Uun Uuu Uub
(223) 226.025 (260) (261) (262} (263} (264) 1265) (268} (269) (272) (269)
82 83 84 85
Pb Bi Po At
207.2 208.908 (209) (210)
114
116
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Uuh
86
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(222)
118
Uuo
Lanthanides:
57 58 59 60
La Ce Pr Nd
138.906 140.12 140.908 14424
61 62 63 64 65 66 67 68 69 70
Pm Sm Eu Gd Tb Dy Ho Er Tm Yb
(145) 150.36 151.96 157.25 1S8.925 162.50 161.930 167.26 166.934 173.04
Actinides:
89 90 91 92 93 94 95 96 97 98 99 100 IOI 102
u Ac Th Pa
Np Pu Am Cm Bk Cf Es Fm Md No
227.028 232.038 231.036 238.029 237 .048 (244) (243) (247) (247) (251} (252) (257) (258) (259)