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BSC410S - BASIC SCIENCE - 2ND OPP - JANUARY 2024 |
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1:-~1 "-,;I nAmlBIA UnlVERSITY
OF SCIEnCE AnDTECHnOLOGY
Facultyof Health,Natural
ResourceasndApplied
Sciences
Schoolof NaturalandApplied
Sciences
Departmentof Biology,
Chemistryand Physics
13JacksonKauJeuaStreet T: +264612072012
Private Bag13388
F: +264612079012
Windhoek
E: dbcp@nust.na
NAMIBIA
W: www.nust.na
QUALIFICATION : VARIOUS
QUALIFICATION CODE: VARIOUS
COURSE: BASIC SCIENCE
DATE: JANUARY 2024
DURATION: 3 HOURS
LEVEL: 4
COURSE CODE: BSC410S
SESSION: 1
MARKS: 100
SECOND OPPORTUNITY I SUPPLEMENT ARY: EXAMINATION QUESTION
PAPER
(FM+PM+DI)
EXAMINER: MRS LEONORITHA NAOMAS, MS MIR.JAM HATUTALE, DR
MUNYARADZI ZIVUKU
MODERATOR: PROF EDOSA OMOREGIE
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 MATERIAL:
Non-Programmable Calculator
ATTACHEMENT:
Periodic Table
This paper consists of 17 pages including this front page and a Periodic Table.
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(30)
QUESTION 1
(20)
Question Type: Multiple Choice Questions. Choose and write the letter corresponding to the
correct answer.
I . I Bacteria uses -----
and -----
to move.
(1)
A. cilia and flagella
B. cilia and legs
C. cilia and tails
D. None of the above
1.2 Bacteria are single-celled microorganisms that belongs to the following type of
organisms;
(1)
A. Prokaryotes
B. Eukaryotes
C. Yeast
D. Fungi
1.3 What is the smallest possible unit that exhibits all the characteristics of life?
(I)
A. Monosaccharide
B. Virus
C. Cell
D. Cell membrane
1.4 What are the seven characteristics of living things?
(1)
A. movement, respiration, sensitivity, nutrition, excretion, reproduction, growth
B. movement, respiration, sensitivity, nutrition, excretion, reproduction, death
C. movement, respiration, sensibility, nutrition, excretion, reproduction, growth
D. movement, respiration, sensitivity, nutrition, excitement, reproduction, growth
1.5 Which of the following levels of organization is arranged in the correct sequence from
least to most inclusive?
(1)
A. community, ecosystem, individual, population
B. ecosystem, community, population, individual
C. community, population, ecosystem, individual
D. individual, population, community, ecosystem
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1.6 The following is an example of a biotic factor;
(1)
A. water
B. sunlight
C. plants
D. air
I.7 Plants get their energy from ____ _
(1)
A. decomposers
B. sunlight
C. consumers
D. soil
1.8 Autotrophs are also known as __ _
(1)
A. consumers
B. herbivores
C. producers
D. omnivores
1.9 Food webs have the following characteristics;
(1)
A. They have more organisms involved.
B. They are more complex and involve lots of organisms.
C. It is a more complex of interconnected food chains in an ecosystem.
D. All of the above.
1.IO Which carbohydrate among the following is used during intense exercising?
( 1)
A. starch
B. sucrose
C. fructose
D. glycogen
1.1 I Which of the following is correct?
(I)
A. Sucrose is made of galactose and glucose.
B. Lactose is made up of glucose and fructose.
C. Lactose is made up of galactose and fructose.
D. Sucrose is made up of glucose and fructose.
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1.12 Which of the following is a function of insoluble fiber only?
(I)
A. Regulating blood sugar.
B. Regulating the pH of the body.
C. Adding bulk to stool.
D. Lowering cholesterol.
1.13 Which of the following is false?
(1)
A. Fats provide insulation.
B. Fats maintain healthy skin and hair.
C. Vitamin A, D, E and Kare fat soluble only.
D. Fats provide instant energy.
1.14 The following are the reasons why partially hydrogenated oils are used in the food
industry. Which one is untrue?
(1)
A. Long shelf life
B. Less refrigeration required
C. Inexpensive
D. Healthy
1.15 How many water molecules are needed to hydrolyse a monomer with 20 monomers
long?
(1)
A. 10
B. 40
C. 5
D. 2
1.16 The yeast used for the production of Ale is;
A. Saccharomyces carlsbergensis
B. Saccharomyces cerevisiae
C. Saccharomyces uvarum
D. Streptococcus thermophilus
(1)
•
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1.17 Yeast is used to provide enzymes to convert;
(1)
A. maltose to glucose
B. lactose to galactose
C. sucrose to :fructose
D. lactose to glucose
1. 18 In order to produce sweet wine;
(I)
A. all the sugar must be converted to alcohol.
B. all the glucose must be consumed.
C. the fermentation process should be extended.
D. the fermentation process should be stopped before all sugar is used up.
1.19 Why do pastry chefs knead dough?
(1)
A. to increase the production of carbon dioxide
B. to give it shape
C. to exercise
D. to stop fermentation
1.20 Alcoholic beverages can be divided into different classes. Which one of the following is
not a class in alcoholic beverages?
(1)
A. beer
B. wine
C. yoghurt
D. spirits
QUESTION2
(10)
2.1 Explain why vitamin K is also known as the clot master.
(2)
2.2 Contrast how fungi digest and absorb their food with your own digestion.
(2)
2.3 Name and explain the two reproductive mechanisms in gymnosperms.
(4)
2.4 State the 10 % Law and how does it explain why energy is referred to as an energy flow
and not an energy cycle.
(2)
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(35)
QUESTION3
(20)
Question Type: Multiple Choice Questions. Choose and write the letter corresponding to the
correct answer.
3.1 Which of the following represents a value?
(I)
A. Length of 50
B. 50 degrees Celsius
C. Volume of 50
D. Temperature of 50
3.2 Which one of the units is SI unit?
(1)
A. Mol
B. Hour
C. g/cm 3
D. N
3.3 The error in a measurement can be calculated. Which of the following expression is used
to calculate the error in the measurement?
(1)
A. The sum of accepted value and experimental value
B. The quotient of accepted value and experimental value
C. The product of accepted value and experimental value
D. The difference of accepted value and experimental value
3.4 Which one of the measurements have same significant figures?
(I)
A. 1.43 and 0.04
B. 45 and 0.0739
C. 0.00506 and 2.00
D. 2.05 and 9
3.5 Which of the instruments is used to measure weight?
(1)
A. Balance scale
B. Spring balance
C. Thermometer
D. Metric tape
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3.6 All matter is composed of;
(1)
A. an atom
B. density
C. mass
D. volume
3.7 Which of the physical properties of the substance depends on the amount of matter in the
sample?
(1)
A. Hardness of the sample
B. Melting point of the sample
C. Length of the sample
D. The color of the sample
3.8 Decomposition of wood is classified as an example of;
(1)
A. Physical property
B. Chemical Property
C. Reactive Property
D. none of the above
3.9 Which of the statements describe a reverse sublimation?
(1)
A. Solid to liquid
B. Solid to gas
C. Gas to Solid
D. Gas to liquid
3.10 Which the following is a compound?
(1)
A. Na
B. Cl
C. NaCl
D. All the above
3.11 The technique used to separate a mixture of substances based on their solubility within a
given solvent is;
(1)
A. Evaporation
B. Simple distillation
C. Chromatography
D. Fractional distillation
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3.12 What is the name of the scientist who proposed that the electrons are arranged in orbits
around the nucleus of the atom and electrons move in a particular path have fixed
energy?
(1)
A. Ernest Rutherford
B. J J Thomson
C. Neils Bohr
D. John Dalton
3 .13 Which of the statements describes the nature of a neutral atom of all elements in the
periodic table?
( 1)
A. The number of protons is equal to the number of neutrons
B. The number of protons is equal to the number of electrons
C. The number of protons is different to the number of electrons
D. None of the above
3.14 What is the charge and the location of the neutron of an atom?
(1)
A. Positive and electron cloud
B. Positive ·and nucleus
C. zero and electron cloud
D. neutral and nucleus
3.15 What is the name of the group in which atom of the elements gain one electron when
they form ion?
(1)
A. halogens
B. alkali metals
C. alkaline earth metals
D. noble gases
3.16 Which of the electronic configurations is for the element in group 8?
(1)
A. 2, 8, 6
B. 2, 8, 1
C. 2, 8, 3
D. 2, 8, 8
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3.17 Acid is defined as a substance that produces ............ when dissolved in aqueous
solution. Which option completes the statement?
(I)
A. H20
B. Off
C. H+
D. Na+
3.18 What is the chemical name for Baking soda?
(1)
A. Sodium chloride
B. Sodium hydrogencarbonate
C. Sodium carbonate decahydrate
D. Sodium carbonate
3.19 A reaction between an acid and base is known as?
(I)
A. Acidification
B. Neutralization
C. Alkalinity
D. None of the above
3.20 What is the color of phenolphthalein when added to the basic solution?
(I)
A. pink
B. yellow
C. blue
D. colorless
QUESTION 4: Structured questions
(15)
4.1 Apply the rule(s) of significant figures to calculate the following;
(i) 6.45 X 2.3,
(2)
(ii) 12.7899 - 2.27
(2)
4.2 Define the term Synthesis.
(1)
4.3 Copy and complete e the equation below;
(2)
Acid + Base -+
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4.4 (i) Answer the question by filling the missing information in the table.
Element
Number of
protons
Number of
Neutrons
Number of Overall charge
electrons
Element B
19
20
+l
Element C
16
15
0
Element D
8
8
6
(3)
(ii) State the element in the table which is a metal.
(1)
(iii) write the electronic configuration of element C.
(l)
4.5 State the difference between strong acid and weak acid.
(2)
4.6 State one common alkali/base.
(I)
QUESTIONS
(35)1
(20)
Question Type: Multiple Choice Questions. Choose and write the letter corresponding to the
correct answer.
5.1 Which statement is FALSE for line graphs?
(1)
A. A slope may be an indication of how fast the line raises.
B. A slope may be an indication of how fast the line falls.
C. A slope is a value of extrapolation.
D. A slope is another name for gradient.
5.2 The dependent and independent variables are being plotted on ___ and
respectively.
(1)
A. Horizontal and vertical axis
B. Vertical and y axis
C. Vertical and horizontal
D. None of the above
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5.3 Which of the following is not an application ofNewton's 3rd law of motion?
(I)
A. A swimmer pushes the water backwards with their hands, and in return, the water
pushes the swimmer forwards, thus enabling him to go forward during swimming.
B. A man walking on the ground: While walking, a person pushes the ground in the
backward direction, and the ground in return pushes the person in the forward
direction, thus making them walk.
C. A bird, while flying, pushes the air downwards with the help of its wings. Consistent
with Newton's third law of motion, the air makes the bird go upwards.
D. None of the above
5.3 Which one of the following is correct?
(1)
A. A bar graph is the same as a histogram
B. To draw a line graph, simply join all the points plotted.
C. Pie charts are also known as 360°.
D. A bar graph is well descriptive.
5.5 Given that an astronaut exert a force of 128 Non the moon and the gravitational field
strength on the moon is 1.6 N/kg. What is the mass of the astronaut in kg?
(1)
A. 75
B. 90
C. 80
D. 65
5.6 If the mass of the body is doubled and its acceleration becomes half, then the Net Force
will of the body will____
(1)
A. become double
B. remain the same
C. become half
D. become four times
5.7 When a net force is applied, the following can have an effect on the object except; (I)
A. No net change in the position of the object
B. Change (increase or decrease) the velocity of the object
C. Change the direction of the moving object
D. Change the shape of the moving object.
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5.8 Which of the following is a renewable source of energy?
(I)
A. Nuclear energy
B. Coal
C. Crude oil
D. Geothermal
5.9 What is the main difference in the generation of electricity with water and nuclear
energy.
(1)
A. Nuclear energy is a dangerous source of energy and hydroelectric power is safe
B. In nuclear energy fission of atoms heat water which turns the generator which
generator electricity while in hydroelectric energy, potential energy of water turns the
turbines which turns the electricity.
C. Hydroelectric power is a renewable source of energy while nuclear energy is non-
renewable source of energy.
D. All of the above.
5. IO During the ascent phase of a rep of the bench press, the Iifter exerts an average vertical
force against a 5000-gram barbell while the barbell moves 0.8 m upward. How much work
did the lifter do to the barbell? Express your answer in kilojoules (kJ). Assuming the
acceleration due to gravity (g) to 10 m/s2.
(I)
BENCH-PRESS
A. 0.04 kJ
B. 40 kJ
C. 0.4 kJ
D.4kJ
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5.11Which of the following statement is true about inelastic collision?
(1)
A. Kinetic energy before collision is equal to kinetic energy after collision
B. Kinetic energy before collision is grater than the kinetic energy after collision
C. Kinetic energy before collision is less than the kinetic energy after collision
D. The total kinetic energy conserved
5.12 The current in a wire-----------
(1)
A. depends on the potential deference applied
B. depends on the resistance and potential difference of the wire
C. does not depends on the resistance and potential difference
D. depends on the resistance of the wire.
USE THE CIRCUIT DIAGRAM TO ANSWER QUESTION 5.13 , 5.14 and 5.15
12d
[6q
5.13 What is the resistance in parallel resistors?
(1)
A. 380
B. 400
C. 1.17 0
D. 1.71 0
5.14 The equivalence resistance is ________
_
(1)
A. 40.12 n
B. 37.71 0
C. 38.00 0
D. 48.00 0
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5.15 The total current at the 30 n resistor is -----
(1)
A.0.318A
B. 0.030 A
C. 0.250 A
D. 0.300 A
5.16 When polonium 239 undergo alpha decay, it changes to uranium 235 in a process known
as
(1)
A. transformation
B. fission
C. radioactivity
D. transmutation
5.17 Which of the following particle is the lightest by size___ _
(1)
A. gammaray
B. helium atom
C. X rays
D. an electron
5.18 What is the safest way to dispose of a large quantity of highly radioactive waste? (1)
A. burying it in dry underground rocks
B. pouring it down the drain
C. burning it on a fire
D. pumping it into a river
5.19 A nuclide X decays to nuclide Y by alpha decay as illustrated by the nuclear equation;
(1)
Nuclide X and nuclide Y are likely to be___ _
Nuclide X
A
Th-234
B
U-238
C
U-238
D
U-238
Nuclide Y
U-239
Th-234
Th-230
Np-230
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5.20 Which of the following is a heavier radiation particle?
A. gamma ray
B. Beta particle
C. alpha particle
D. neutron
QUESTION6
(15)
6.1 Study the following pie chart to answer the questions. In total 50 000 vehicles were sold
by XYZ Auto Company in the year 1999.
= Pcrccnt()!lcof VcMle Typcsthot XYZ
'-AO COmpony In 1999
33% 13%
SUV'S
(i) Calculate the total number of Trucks and SUV's sold.
(3)
(ii) How many vehicles were 4-doors only?
(2)
6.2 A cart at the top of a 300 m hill has a mass of 420 g.
300
(i) Assuming that the acceleration due to gravity is 9 .8 m/s/s. What is the
cart's gravitational potential energy?
(2)
(ii) Assuming that energy is conserved and there is no friction, calculate the
cart's speed at the bottom of the hill.
(3)
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6.3 Construct a circuit diagram containing 3 resistors a, b, c in parallel, resistors d and e in
series, with an ammeter and 2 cells in series with a conventional current and an open
circuit.
(5)
END
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PERIODICTABLE OF THE ELEMENTS
1-8-
1
2
H
1.00794 2
13
14
15
He
16
17 4.00260
34
5 6 7 8 9 10
Li Be
B C N 0 F Ne
6.941 9.01218
10.81 12.01 l 14.0067 15.9994 18.9984 20.179
11 12
Na Mg
22.9898 24.305 3
4
s
6
13 14 15 16 17 18
Al Si p s Cl Ar
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 65.38 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
I-'
-..J
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 ll4.82 118.69 121.75 127.6 126.9 13I .29
55 56 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
Cs Ba Lu Hf Ta w Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
132.905 137.33 174.967 178.49 180.948 183.85 186.207 190.2 192.22 195.08 196.967 200.59 204.383 207.2 208.908 (209) (210) (222)
87 88 103 104 105 106 107 108 109 110 111 112
114
116
118
Fr Ra Lr Rf Db Sg Bh Hs Mt Uun Uuu Uub
Uuq
(223) 226.0H (260) (261) (262) (263} (264) '265) '268) (269) (272) (269)
Uuh
Uuo
LanlhMnides: 57 58 59 60 61 62 63 64 65 66 67 68 69 70
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb
138.906 140.12 140.908 144.24 (145) 15036 151.96 157.2S 158.925 162.50 161.930 167.26 166.934 173.04
Actinides:
u 89 90 91 92 93 94 95 96 97 98 99 100 101 102
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)