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BSC410S - BASIC SCIENCE - 2ND OPP - JAN 2023 |
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nAm I BI A un IVERSITY
OF SCIEnCE
TECHn0L0GY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: ALL PROGRAMMES
QUALIFICATION CODE:
LEVEL: 4
COURSE CODE: BSC410S
COURSE NAME: BASICSCIENCE
SESSION: JANUARY2023
PAPER: THEORY
DURATION: 3 HOURS
MARKS: 100
SECOND OPPORTUNITY/SUPPLEMENTARY EXAMINATION PAPER (FM, PM AND DI)
EXAMINER(S)
MODERATOR:
DR. MUNYARADZI ZIVUKU, MR. PETRUS PAULUS AND MR. TUWILIKA
TOBIAS
DR. EDOSAOMOREGIE
INSTRUCTIONS
1.
Write all your answers in the answer booklet provided.
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 paper.
PERMISSIBLE MATERIALS
Non-programmable Scientific Calculator
THIS EXAMINATION QUESTION PAPER CONSISTS OF 14 PAGES
(INCLUDING THIS FRONT PAGE)
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SECTION A: BIOLOGY
[35]
QUESTION 1:
{20)
Question type: Multiple choices. Read the questions carefully, choose and write the correct
letter corresponding to the correct answer. Each question weighs 2 marks.
1.1 Which of the following options is the correct order for increasing complexity?
(2)
A.
B.
C.
D. cells
organs
organ
tissues
organ
organism
organ systems
organism
organ systems organism
1.2 Monoecious are;
(2)
A. plants that have separate male and female flowers on the same plant.
B. plants that have the male flowers on one plant and female flowers on another plant.
C. non-flowing plants
D. naked seed producing plants
1.3 A non-living organism is one that ______
_
{2)
A. shows all the 7 characteristics of living organisms
B. lacks all characteristics of living organisms
C. has ceased to show the characteristics of living organisms
D. responds to danger and grow
1.4 A starter culture in the food industry is____
_
{2)
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
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1.5 Unsaturated fats;
(2)
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.
1.6 Organisms within communities and ecosystems feed on one another to obtain energy and
nutrients. What component does not cycle within an ecosystem?
(2)
A. soil nutrients
B. energy
C. plant nutrients
D. components of hard animal structures.
1.7 Which of the following options is the primary function of proteins?
(2)
A. growth of new cells
B. repair of damaged cells
C. manufacture of antibodies
D. all of the above.
1.8 Which of the following group of people has a high demand for calcium?
(2)
A. Growing children and elderly women
B. Growing children and young women
C. Growing children and expectant women/ breast feeding women
D. Elderly men and young men.
1.9 Which of the following is NOT a fat-soluble vitamin?
(2)
A. Vitamins A
B. Vitamins C
C. Vitamins D
D. Vitamins E
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1.10 Abiotic factors are elements that compose a given environment such as;
(2)
A. light, temperature, minerals, water
B. gases, atmospheric pressure, rocks, fungi
C. water, sunlight, microorganisms, minerals
D. soil, gases, epiphytes, light
QUESTION 2:
(15)
Question type: Structured questions.
2.1 Distinguish between unicellular and multicellular organisms.
(2)
2.2 Briefly discuss why a scientific name of organisms is more important than its common
name.
(2)
2.3 The rhinoceros (rhino) is a protected animal in Namibia. It is an endangered or extinct
animal, explain?
(2)
2.4 Feeding on yogurt, especially children, it is said to boost the immune system and
promote growth. Explain?
(4)
2.5 Discuss the statement, "You are what you eat''?
(2)
2.6 What is the relationship between vitamin D and bone development?
(1)
2.6 Discuss the effects of omitting the addition of the starter culture during the production
of yogurt?
(2)
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[35]
QUESTION 3:
(20)
Question type: Multiple choices. Read the questions carefully, choose and write the correct
letter corresponding to the correct answer. Each question weighs 2 marks.
3.1 Which of the following is a qualitative measurement?
(2)
A. Height
B. Weight
C. Density
D. Color
3.2 Which of these is not an SI unit?
(2)
A. Celsius
B. Kelvin
C. Kilogram
D. Meter
3.3 The scientific notation form of 0.0000482 is
?
(2)
A. 4x10 5
B. 4x10-5
C. 4.82x10- 5
D. 4.82x10 5
3.4 __ is an example of chemical properties of matter.
(2)
A. Boiling point
B. Decomposition
C. Density
D. Odor
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3.5 Which of the following is an exothermic process?
(2)
A. Melting
B. Freezing
C. Evaporation
D. Sublimation
3.6 Which equation represents the law of conservation of mass?
(2)
A. MaSSreactan=tsMaSSproducts
B. MaSSreacta-n;t,Ms aSSproducts
C. Densityreactan=tsDensityproducts
D. DensitYreactan-;ttsDensityproducts
3.7
is a metalloid.
(2)
A. Carbon
B. Magnesium
C. Lead
D. Polonium
3.8 NaOH + HCI NaCl+ H2Ois chemically known as?
(2)
A. Neutralization
B. Ionization
C. Dissociation
D. Acidification
3.9 Which of the following is a soluble base?
(2)
A. Sodium hydroxide
B. Copper (II) Oxide
C. Iron (Ill) Oxide
D. Lead (II) Oxide
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3.10 Sodium Hydroxide is commonly known as
?
(2)
A. Caustic soda
B. Bleaching soda
C. Washing soda
D. Baking soda
QUESTION 4:
[15]
Question type: Structured questions.
4.1 Convert 500 Gigameters to meters.
(2)
4.2 Use the appropriate significant figures rule to carry out the calculation below;
(2)
4.3 Explain the physical properties of the three states of matter in terms of their shapes and
volume.
(3)
4.4 Differentiate between Compounds and Mixtures?
(2)
4.5 Given the following measurements obtained by three students for the length of an
object (in cm):
Student Trial 1 Trial 2 Trial 3
Trial 4
Average
1
11.2
11.1
11.1
11.2
11.2
2
11.1
11.8
11.9
11.2
11.5
3
11.4
11.6
11.5
11.5
11.5
If the length of the object is known to be 11.54 cm;
(3)
(a) Which student is accurate and precise?
(b) Which student is not accurate, but precise?
(c) Which student is accurate, but not precise?
4.6 State any three physical properties of bases.
(3)
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SECTION C: PHYSICS
[30)
QUESTION 5:
(20)
Question type: Multiple choices. Read the questions carefully, choose and write the correct
letter corresponding to the correct answer. Each question weighs 2 marks.
5.1 The pie graph shows the Vehicle types that were sold at company XYZin in Windhoek in
1999.
Percentage of Vehicle Types that XYZ
Auto Company sold in 1999
33%
4-DOORSEDANS
2,DOORSEDANS
If XYZcompany sold 23 000 vehicles in 1999, how many were SUVs?
(2}
A. 3030
B. 1990
C. 2990
D. 3450
5.2 Newton's first law of motion can be best described as----
(2}
A. the force is equal to the product of mass and acceleration of the object
B. the resultant of action - reaction
C. an object at rest will stay at rest, and an objection in motion will contention to move
at the same velocity and direction until acted upon by an external force
D. None of the above.
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5.3 Which of the following is a renewable source of energy?
(2)
A. Nuclear energy
B. Coal
C. Crude oil
D. Wind
5.4 A motorist on a long journey recorded the distances that he had travelled (km) every hour
for a period of six hours, as shown in the graph below
USE THE GRAPH BELOW TO ANSWER QUESTION 4 and 5
350
300
250
20D
150
100
...r.:..__ 50
E
"
"U
0
(lJ
(lJ
0..
V1
-50
y=
1
2
Time (h}
5
6
7
What is the speed of the approximate journey in SI units?
(2)
A. 58.57 km/h
B. 58.57 m/s
C. 16.27 m/s
D. 162 km/h
= = 5.5 What will the distance travelled metres between the time t ls and t 6s?
(2)
A. 900
B. 900 000
C. 90
D. 0.9
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5.6 A scientist carried out an experiment and realize that the force being exerted by the apple
to the earth was 3.92 N. Similarly the earth was also exerting a force of equal magnitude
to the apple of 3.92 N. The scientist was so surprised that the earth has an equal force as
the apple. Which of the following statement best describe this astonishing result? {2}
A. The mass of apple is relatively big, while its acceleration is extremely high and
similarly, the mass of the earth is very large and its acceleration so small.
B. The mass of apple is relatively small, while its acceleration is extremely low and
similarly, the mass of the earth is very large and its acceleration so small.
C. The mass of apple is relatively small, while its acceleration is extremely high and
similarly, the mass of the earth is very small and its acceleration so small.
D. The mass of apple is relatively small, while its acceleration is extremely high and
similarly, the mass of the earth is very large and its acceleration so small.
5. 7 A student carried out the following experiment to determine the extension of the spring
when a certain amount of force has been applied.
Measuring spring extension
~l·
§7S_cm1__7 e_lm
(a)
- --
(b) 3 N
L
J_
(c)
6N
The extension of the spring designated as letter Lin mm is likely to be __ _
(2)
A. 9
B. 10
C. 90
D. 11
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5.8 The main purpose of the fuse on an electrical appliance is to;
(2)
A. ensure that current flows through it to the appliance.
B. cut the flow of current when there is a short circuit.
C. make the appliance more beautiful.
D. no one knows its purpose.
5.9 What is the main difference in the generation of electricity with water and nuclear
energy?
(2)
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 to produce
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.
5.10 The main advantage of using nuclear energy compared to coal is _____
_
(2)
A. Nuclear energy is a renewable source of energy while coal is a non-renewable
source of energy.
B. Nuclear energy is cheap to install as opposed to coal which needs a lot land for the
construction of coal plant.
C. Nuclear energy is green source of energy unlike coal which pollute the atmosphere.
D. Nuclear is very dangerous and therefore can generate a lot of electricity more than
coal.
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QUESTION 6:
(10)
Question type: Structured questions.
6.1 Peter and Susan are pushing a wooden object across a big table. Peter applied a force of
40 N and Susan applied a force of 20 N. The object is experiencing of force of friction
{FT) of 10 N as shown in the free body diagram.
rN
:i.:.:N::::::::;;;;:::;:::::;;;;:::;;;;:::;;;;::_:e4.~.=..=..=.!=l_:;_;;;_;:F:.:.=:.T;::::;;;;::::::::..1
Fg
Given that the wooden object is having a force of gravity {Fg) of 20 N and acceleration
due to gravity of 10 ms-2.
(a) Determine the normal force of the wooden object.
(1)
(b) Calculate the mass (kg) the object, given that the normal force is 20 N.
(2)
6.2 A student with a mass of 820 g stands at the top of a hill of height 0.4 km {Position A), as
shown in the diagram below. Note: Answers should be in SI units
0.4Km
._ _____________
Position B
:A ...,.i:llli,,__
6.2.1 What is the student's gravitational potential energy at the top of the hill?
{2)
Note: Gravitational acceleration (g) = 9.8 ms 2
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6.2.2 Assuming that energy is conserved and there is no friction, what will the student's
velocity be at the bottom of the hill (position B)?
(2)
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.
(3)
END
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PERIODIC TABLE OF THE ELEMENTS
18
1
2
H
1.00794 2
13
14
15
He
16
17 4.00260
34
56
7
8
9
IO
Li Be
B C N 0 F Ne
6.941 9.01218
10.81 12.01 I 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
"'O
QJ
(]Q
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
C..'D..
Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
.i::,,
0..........
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 13129
55 56 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
.i::,,
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 186207 1902 192.22 195.08 196.967 200.59 204383 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) 226.025 (260) (261) (262) (263} (264) (265) '268} (269) (272) (269)
Uuh
Uuo
Lanthanides: 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) 150.36 151.96 157.25 158.925 162.50 161.930 167.26 166.934 173.04
Actinides:
89 90 91 92 93 94 95 96 97 98 99 100 101 102
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}
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