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BSC410S - BASIC SCIENCE 2 - 1ST OPP - NOV 2022 |
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n Am I BI A u n IVER s I TY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: ALL PROGRAMMES
QUALIFICATION CODE:
LEVEL: 4
COURSE CODE: BSC410S
SESSION: NOVEMBER 2022
COURSE NAME: BASIC SCIENCE
PAPER: THEORY
DURATION: 3 HOURS
MARKS: 100
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER (FULLTIME)
EXAMINER(S) DR. VAINO INDONGO, MR. PERTUS PAULUS AND MR. TUWILIKA TOBIAS
MODERATOR: DR. EDOSA OMOREGIE
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.
A Periodic Table is attached at the back of this paper.
PERMISSIBLE MATERIALS
Non-programmable Scientific Calculator
THIS EXAMINATION QUESTION PAPER CONSISTS OF 11 PAGES
Page 1 of 11
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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 statement is not true about viruses?
(2)
A. They can reproduce independently without a host.
B. They are not included in the six kingdoms of living organism.
C. They cannot strictly be considers as living organism.
D. Each contain either DNA or DNA.
1.2 What is a characteristic of living things that sets them apart from the non-living?
(2)
A. They respond to a stimulus.
B. They grow and reproduce.
C. Adaptation to a way of life.
D. All of the above are characteristics of living things.
1.3 The main function of rennet in the manufacture of hard cheese is to __
(2)
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
1.4 An obligatory association between two different species that is beneficial to both
populations of organisms is __ _
(2)
A. symbiotic.
B. parasitic.
C. predatory.
D. mutualistic.
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1.5 Saturated fats;
(2)
A. have no double bonds in their fatty acid chains.
B. are more common in plants than in animals.
C. are associated with lesser health risks than are unsaturated fats.
D. are usually liquid at room temperature.
1.6 During intraspecific competition is between;
(2)
A. different species.
B. abiotic organisms.
C. populations.
D. the same organisms.
1.7 How does water act in most solutions?
(2)
A. It is a universal solute, dissolving mostly ionic or polar covalent substances.
B. It is a universal solvent, dissolving mostly ionic or polar covalent substances.
C. It is a universal solute, dissolving mostly non-polar covalent substances.
D. It is a universal solvent, dissolving mostly non-polar substances.
1.8 All of the following are true about fermentation except;
(2)
A. It improves the sensory characteristics of food.
B. It is undesirable process in the food industry as it spoils the food.
C. It extends the shelf life of food.
D. It changes the nutritional value of food for example converting milk into cheese.
1.9 A food web is ----
(2)
A. the same as a food chain
B. linear, involving one organism at a trophic level
C. the grouping of heterotrophs without producers
D. the interconnection of food chains involving more than one organism at a trophic
level
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1.10 A garden pea plant forms flowers that undergo self or cross pollination to produce
seeds. These seeds mature in two to three weeks. Which characteristics of living things
are being described here?
(2)
A. Cellular organization and use of energy
B. Reproduction and response to environment
C. Growth and reproduction
D. Use of energy and development
QUESTION 2:
(15)
Question type: Structured questions.
2.1 Discuss the importance of the following characteristics of living organisms.
i) Growth
{2)
ii) Reproduction
(2)
2.2 State any two types of shapes used in classifying prokaryotes such as bacteria
(2)
2.2 The cow medication, diclofenac, was banned in India because it poisoned and killed
as many as 90 percent of that country's vultures. Figure 1 below shows, a white-
rumped vulture (Gyps bengalensis), which is an Indian vulture, feeding on a cow
carcass. Discuss the critical roles that scavengers play to the stability of the ecosystem,
food web and environment at large?
(4)
Figure 1
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2.3 Discuss any three effects of a diet that is in deficiency of proteins?
(3)
2.4 For the production of cheese, the optimal temperature for the microorganisms involved
is about 30°C. However, after the addition of the starter culture, the temperature was
mistakenly set at 300°C for the incubation. Explain the effects of that mistake?
(2)
SECTION B: CHEMISTRY
[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 How many significant figures are in 700.400 m?
(2)
A. 3
B. 4
C. 5
D. 6
3.2 The fa ct or 10 9 corresponds to which prefix?
(2)
A. Giga
B. Micro
C. Milli
D. Nano
3.3 What is the SI unit for mass?
{2)
A. Newton
B. Kilogram
C. Milligram
D. Hectogram
3.4 Convert 150 000 Picometers to meters
{2)
A. 1.5x10-7 meters
B. 1.5x10 17 meters
C. 0.15 meters
D. 150 meters
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3.5 Convert 62.2 Fahrenheit to Kelvin.
(2)
A. 335.4 I<
B. 16.8 I<
C. 289.9 I<
D. 94.2 I<
3.6 What is the mass number of Boron?
(2)
A. 26.9815
B. 10.81
C. 12.011
D. 14.0067
3.7 What is common to elements in the same group?
(2)
A. Similar boiling point
B. Similar freezing point
C. Similar number of shells
D. Similar number of valence electron
3.8 Which metal is liquid at room temperature?
(2)
A. Mercury
B. Magnesium
C. Copper
D. Lead
3.9 Which ofthe following elements is unreactive?
(2)
A. Neon
B. Carbon
C. Zinc
D. Potassium
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3.10 Which element in Period 3 has both metallic and non-metallic properties?
(2)
A. Na
B. Mg
C. Si
D. Ar
QUESTION 4:
(15)
Question type: Structured questions.
4.1 Differentiate between Physical and chemical properties of matter and give an example
for each.
(4)
4.2 Explain the behavioral changes of the 3 states of matter under high temperature.
(6)
4.3 With an aid of a diagram (Fig. 2), illustrate the electron configuration of Sodium, and
indicate its number of electrons and mass number.
(3)
Figure 2
4.4 State any 2 features of alkaline earth metals.
(2)
SECTION C: PHYSICIS
[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 ....................... holds constituents of the nucleus together.
(2)
A. Gravity
B. Electromagnetic force
C. Strong nuclear force
D. Weak nuclear force
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5.2 A unit of force called Newton is equivalent to ______
_
(2)
A. g.m/s 2
B. kg.ms-1
C. c.ms-2
D. kg.ms-2
5.3 The force of an object due to gravitational acceleration acting on it is known as __ . {2)
A. mass
B. potential energy
C. action-reaction
D. weight
5.4 For a force to be observed, two bodies ________
necessarily.
(2)
A. must be in contact.
B. do not need to be contact
C. need to have equal forces
D. must have a uniform velocity.
5.5 The gravitational accelerations of the moon and the earth are ____
_
(2)
A. The same
B. Different
C. 6.78 m/s 2
D. 8.91 m/s 2
5.6 An electron and a proton are two _______
particles.
(2)
A. nucleons
B. positively charged
C. negatively charged
D. unlike charged
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5.7 If a coin is dropped towards a magnet, the magnet pulls on the coin just as hard as the
coin pulls on the magnet. Which law applies to this concept?
(2)
A. The law of gravity
B. Inertia
C. Action-Reaction
D. FNET = ma
5.8 Protons and neutrons are found in the following except on;
(2)
A. electronic shells
B. atom
C. nucleus
D. both B and C
5.9 The SI unit for electrical current is;
(2)
A. Amps
B. Coulomb
C. Ohms
D. Volts
5.10 The flow of electrical charges in a closed circuit is known as;
(2)
A. acceleration
B. voltage
C. resistance
D. electricity
QUESTION 6:
[10]
Question type: Structured questions.
6.1 Differentiate between a vector and scalar quantity
(2)
6.2 Suppose a force of 20 N is exerted on a brick and an acceleration of 2.5 m/s/s is
observed. What is the mass of the brick?
(2)
6.2 Briefly discuss how electricity is generated from nuclear energy, i.e. uranium.
(2)
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6.3 A student with a mass of 48 kg stands at the top of a hill of height 0.4 km (Position A),
as shown in the diagram (Figure 3) below. Note: Answer should be in SI units.
0.4Km
Position B
Figure 3.
What is the student's gravitational potential energy at the top of the hill?
(2)
Note: Gravitational acceleration (g) = 10 ms 2
6.4 Study the closed circuit below (Fig.4) with appropriate electrical components below:
6V
20
50
80
Figure 4.
Determine:
(i) the resistance in parallel only.
(2)
(ii) resistance in series only.
{2)
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
3
4
56
7
8 9 10
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
AI 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
-0
OJ
OrQo
I-"
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
I-"
0....,
I-"
85.4678 87.62 88.9059 91.22 92.9064 95.94 (98) 101.07 102.906 106.42 107.868 112.41 114.82 118.69 121.75 127.6 126.9 131.29
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
132.905 137.33 174.967 178.49 180.948 183.85 186.207 190.2 192.22 195.08 196.967 200.59 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) 226.02S (260) (261) (262) (263) (264) (265) '268) (269) (272) (269)
Uuh
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) 150.36 151.96 157.25 158.925 162.50 161.930 167.26 166.934 173.04
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)