r!HFIITIIBIFI Ul'llVERSITY
0F SCIEI'ICE FIFID TECHNOLOGY
FACULTY OF HEALTH AND APPLIED SCIENCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION:
QUALIFICATION CODE: LEVEL: 4
COURSE CODE: BSC410$ COURSE NAME: BASIC SCIENCE
SESSION: JULY 2017 PAPER: THEORY
DURATION: 3 HOURS MARKS: 100
SUPPLEMETARY/SECOND OPPORTUNITY EXAMINATION PAPER
EXAMINER(S) MR. VAINO INDONGO
DR. EUODIA HESS
DR. LAMECH MWAPAGHA
MODERATOR:PROF HABAUKA KWAAMBWA
INSTRUCTIONS
Write all your answers in the answer booklet provided, use black/blue ink pen only.
Read the whole question before answering.
Begin each question on a new page.PWN!‘ The Periodic Table is attached at the back of this question paper.
PERMISSIBLE MATERIALS
1. Examination script
2. Scientific Calculator
THIS EXAMINATION PAPER CONSISTS OF 10 PAGES
(INCLUDING THIS FRONT PAGE AND PERIODIC TABLE)
SECTION A: BIOLOGY [35]
QUESTION 1 [15]
Question Type: Multiple Choice Questions. Each question equals 1 mark.
1.1 In what way(s) do humans threaten the biosphere and damage ecosystems? (1)
.005”?human population size continues to increase rapidlyhumans clear forests for farmland
humans tend to alter ecosystems
All of these are ways humans threaten the biosphere and damage ecosystems.
1.2 What is a characteristic of living things that sets them apart from the nonliving? (1)
.009”?respond to a stimulus
grow and reproduce
adaptation to a way of life.
All of these are characteristics of living things
1.3 The harmed species in a parasitic relationship is called: (1)
POP“?The occupant
The parasite
The host
The Receptor
1.4 An obligatory association between two different species that is beneficial to both populationsof organisms is (1)
90¢?symbiotic.
parasitic.
predatory.mutualistic.
1.5 Which of the following is the least function of proteins? (1)
.0093?growth of new cells
repair of damaged cells
manufacture of antibodies
production of energy.
1.6 Which of the following statements is true? (1)
pop»Symbiosis refers to different organisms living together.Members of a symbiotic relationship cannot live without each other.
Symbiosis refers to different organisms living together and benefiting from each other.
A parasite is not in a symbiosis with its host.
1.7 Prokaryotic organisms make up the;
1.8
1.9
1.10
1.11
1.12
.0093?Archaebacteria, Protists and Eubacteria
Archaebacteria and Eubacteria
Protists and Eubacteria
Protists
As a practical definition of species, one can say that they are a group of organisms
characterised by all of the following except they;
.0090?do not normally interbreed with other species in nature
can be distinguished from other species
are incapable of hybridization with other species
All the above
In gymnosperms, pollination is exclusively by;
POP”?wind
animal
insects
all the above
True multicellularity occurs only in;
.0093?eukaryotes
plants, animals and fungi
plants and animals
plants, animals and protists
The conversion of nitrogen to ammonia or nitrogenous compounds is known as?
.0090?Nitrification
Nitrogen assimilation
Denitrification
Nitrogen fixation
The three macronutrients are
pops?lipids, carbohydrates, proteins
monosaccharide, polysaccharide, disaccharide
fibre, vitamins, proteins
carbohydrates, lipids, glycerol
(1)
(1)
(1)
(1)
(1)
(1)
1.13 Unsaturated fats (1)
have double bonds in their fatty acid chains
are more common in animals than in plants
are associated with greater health risks than are saturated fats.0090? are usually solid at room temperature
1.14 You might find methanogens: (1)
in marshes
in a cow's stomach
in swamps
all of the above.0090?1.15 Which of the following is NOT a fat-soluble vitamin? (1)
Vitamins A
Vitamins B
Vitamins D
Vitamins K.0090?QUESTION 2 [10]
Question Type: Structured Questions.
2.1 Define the term ’autotrophs’ and 'heterotrophs’ giving an example of each. (2)
2.2 State the FOUR economic importance of Conifers Plants (4)
2.3 The African elephant is one of the endangered animals in the whole. Describe the word
endangered and give at least THREE reasons why animals become endangered or extinct. (4)
QUESTION 3 [10]
Question Type: Structured Questions.
3.1 List FOUR general features that characterise protista. (2)
3.2 Complete Table 1. (4)
Table 1
Micronutrient Deficiency disease/signs Food source
Vitamin A (I) ............................. Milk, liver
Vitamin C Bleeding gums (ll) .................................
(III) ........................... Goiter Liver
Calcium (IV) .............................. Milk
3.3 Briefly discuss the primary and secondary stages of wastewater treatment.
SECTION B: CHEMISTRY
QUESTION 4
Multiple choice questions. Each question weighs 1 mark.
4.1 The amount of space taken up by an object is known as
A.Volume
B. Mass
C. LengthD.Area
4.2 Which of the following instruments is used to measure weight?A.Balance scale
B.Spring balance
C. Barometer
D.Opisometer
4.3 How many significant figures does the following measurement contain?
Temperature = 0.0023 °C
.0090? H-bUJN4.4 What is the result of the following calculation, reported to the correct number
of significant figures?
9.428/ 4.26 mL = ?
2.213 g/mL2.21 g/mL2.0 g/mL2.20 g/mLPOP“?
4.5 Solid carbon dioxide has a temperature of —78 °C. What is this temperature
on the Fahrenheit scale?
A. 25.5 °F
B. -108.4 °F
C. -61.11 °F
D. -109 °F
(4)
[35]
[6]
(1)
(1)
(1)
(1)
(1)
4.6 Solid Carbon dioxide has a temperature of -78 °C. What is this temperature
on the Kelvin scale? (1)
195 K
195.15 K
195.2 K
195.1 K.0090?QUESTION 5 [29]
5.1 Classify each of the following as intensive or extensive property. (4)
a. Densityb. Magnetic attraction
c. Boiling Point
d. Volume
5.2 State whether each of the following changes in the state of matter is a physical or chemical
change. (5)
a. Ironing a shirt
b. Decomposition of organic matter
c. Fermentation of sugar
d. Distillation of crude oil
e. making a cup of tea
5.3 Classify each ofthe following as an element, compound, homogeneous or heterogeneousmixture: (3)
a. air you breath
b.Table salt
c. a cup of coffee
5.4 Name the process when the following changes in the state of matter occur and
indicate whether the change in state is an endothermic or exothermic
process. (8)
a. Gas into Solid
b. Liquid into Solid
c. Solid into Gas
d. Gas into Liquid
5.5 Use your knowledge of the atom to complete the following table.
Element name Symbol #p+ #e‘ #n0 Charge
(atom or ion)
Argon 20
Potassium ion 39 19 18
K+1
19
sulphur ion 16 -2
SECTION C: PHYSICS
QUESTION 6
Question Type: Multiple Choices. Each answer equals 1 mark.
6.1 A police man sends out radar waves with a 3.4 cm wavelength from his police car with a
speed of 3 x 108 m/s. What is their frequency?
8.82 x 109 Hz
2.88 x 109 Hz
8.28 x 109 Hz
8.82 x 106 Hz.0090?6.2 Which of the following is NOT an example of a transverse waves?
water waves
5 earthquake waves
sound waves
rope waves.0091»6.3 The amplitude of a wave can be described as
the displacement of the size of the disturbance
the distance of a repeating unit
how fast the waves travels
the cycle of the waves.0092?6.4 A type of energy source formed from the fossilised remains of pre—historic
plant and animal material is called
A. fossil fuels
B. biomass
C. biofuels
D. geothermal
(9)
[30]
[10]
(1)
(1)
(1)
(1)
6.5 Energy produced by the oceans as a result of movements of water flowingback and forth is called
A. geothermal energy
B. heat energy
C. hydroelectric energy
D. tidal energy
6.6 A gas produced by burning fossil fuels and cause ’greenhouse effect’ is known
as
sulphur dioxide
natural gas
oxygen
carbon dioxidePOP”?6.7 An apple of mass 23 g falls from a tree at 5 m height. What is the potential energy of an
apple? Assume that the gravitational acceleration of the earth is 9.8 m.s'2.
3 Joules
2jou|es1.127 Joules
0.82 Joules.0090?6.8 The following nuclear equation shows a nuclide undergoing beta decay.
What is the new nuclide formed indicated by the letter X:
146C _) 147)( + °_1eCarbon
Nitrogen
Helium atom
Sulphur.0093?6.9 When a radionuclide undergo alpha decay, its mass number decreases by
and atomic decreases by
2and4
3and4
4and2
landO.0090?
(1)
(1)
(1)
(1)
(1)
6.10 A contact force acting in the opposite direction when an ink pen is slid on the surface of the
book is known as
Friction
Magnetic force
Applied force
Tension.005»?(1)
QUESTION 7
7.1 The equation for the alpha decay of Ra-226 is given by;
22
688Ra ”‘dx + 42He
[9]
Determine the values of m and cl and give the name of the new element X that is formed after
the decay?
7.2 Define radioactive isotope.
7.3 Complete the table.
(3)
(1)
(5)
Types of Penetrating power Magnetic Deflection What is it
Radiation with magnet
Gamma (i) .................. (ii) .................. Electromagneticwave.
Very short wave
length
Very high energy
(iii) ............... Goes through thin Large deflection High energy
paper electrons (negative
charged)
(iv) ................ Will not go thin (v) ............... Positively charged
paper. Can be helium nucleus 4zHe
stopped by few
mm of metal.
QUESTION 8 [11]
8.1 Define the following terms: (2)a. Newton’s first law
b. longitudinal wave
8.2 List three effects that a force when applied, can have on an object moving at a constant
velocity. (3)
8.3 The average percentage of six groups after their first semester examination is as follows:
Group 1 with 21%, Group 2 with 9%, Group 3 with 42%, Group 4 with 37%, Group 5 with 54%
Group 6 with 60%.
Use the data to draw a column graph of average percentage against group number. (6)
END OF EXAM!!!!!!!!
PERIODICTABLEOFTHEELEMENTS
1
18
1
2
H
He
1.00794
2
‘3
14
‘5
16
'7
4.00260
10
3
4
5
6
7
8
9
10
Li
Be
B
C
N
0
F
Ne
6.941
9.01218
10.81
12.011
14.0067
15999418998420.179
11
12
13
14
15
16
17
18
Na
Mg
Al
Si
P
S
Cl
Ar
22.989824.305
3
4
5
6
7
8
9
10
11
12
26.981528.085530.9738
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
50.941551.996
54.938055.847
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
13129
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
T1
Pb
Bi
Po
At
Rn
132.905
137.33
174.967178.49
180.948
183.85
186207
1902
19222
195.08
196.967200.59
204383
2072
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
H3
Mt
Uun
Uuu
Uub
Uuq
Uuh
Uuo
(223)
226.025
(260)
(261)
(262)
(263)
(264)
(265)
(268)
(269)
(272)
(269)
Lanthlflidwl
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
138.906140.12140.908144.24(145)
15036
151.96
157.25
158.925
162.5016193016726166.9314173.04
Actinides:
89
90
91
92
93
94
95
96
97
98
99
100
101
102
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
227.028232.038231.036238.029237.048
(244)
(243)
(247)
(247)
(251)
(252)
(257)
(258)
(259)