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BSC410S - BASIC SCIENCE - 2ND OPP - JULY 2023 |
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n Am I BI A u n IVER s I TY
OF SCIEnCE Ano TECHn OLOGY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
SCHOOL OF NATURAL AND APPLIED SCIENCES
DEPARTMENT OF BIOLOGY, CHEMISTRY AND PHYSICS
QUALIFICATION: ALL PROGRAMMES
QUALIFICATION CODE:
LEVEL: 4
COURSE CODE: BSC41 OS
COURSE NAME: BASIC SCIENCE
SESSION: JULY 2023
DURATION: 3 HOURS
PAPER:THEORY
MARKS: 100
SECOND OPPORTUNITY/SUPPLEMENTARY EXAMINATION PAPER
EXAMINER(S)
MODERATOR:
MRS MARTA ELVIN, MRS LEONORITHA NAOMAS, MR TUWILKA
TOBIAS, MR E. EJEMBI AND DR VAINO INDONGO
DRE. 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 PAPER CONSISTS OF 18 PAGES
(INCLUDING THIS FRONT PAGE)
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QUESTION 1:
-~"'--~-~_..,~....,._-....._._[.3.5_] .._=-~
(20)
Question type: Multiple choices. Read the questions carefully, choose and write the
correct letter. Each question carries 1 mark.
1.1 Which of the following is NOT a monosaccharide?
(1)
A. Glucose
B. Galactose
C. Fructose
D. Maltose
1.2 Sucrose is composed of;
(1)
A. Glucose + Fructose
B. 2 Fructose molecules
C. 2 glucose molecules
D. Fructose and a lot of other industrial chemicals
1.3 Most dietary fibers are made of;
(1)
A. cellulose
B. starch
C. chitin
D. glycogen
1.4 Which of the following defines a trans fatty acid?
(1)
A. Any fatty acid with a double bond in it.
B. Any fatty acid with no double bonds in it.
C. Any fatty acid with two carbon-chains on the same side of a double bond.
D. Any fatty acid with two carbon-chains on opposite sides of a double bond.
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1.5 A greater stability of the biosphere would most likely result from;
(1)
A. decreased finite resources
B. increased deforestation
C. increased biodiversity
D. decreased consumer populations
1.6 Which of the following is the correct sequence of levels of classification in an
increasing order?
(1)
A. genus, species, order, phylum, family, class, kingdom
B. genus, species, order, family, class, phylum, kingdom
C. species, genus, family, order, class, phylum, kingdom
D. kingdom, phylum, class, family, order, genus, species
1.7 A plant that is an angiosperm have the following characteristics;
(1)
A. Angiosperm means "covered seed"
B. Have flowers, fruits with seeds
C. Live everywhere - dominant plants in the world
D. Does not include herb plants
1.8 Which of the following options is NOT a feature of monocot plant?
(1)
A. One cotyledon
B. Flowers in multiples of three
C. parallel leaf venation
D. tap root system
1.9 The following are three kinds of globular protein EXCEPT;
(1)
A. keratin in hair and nails
B. haemoglobin in red blood cell
C. myosin in muscle tissues
D. enzymes in cells
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1.10 Anaerobic digestion of animal waste produce a substance known as;
(1)
A. Methane
B. Butane
C. Propane
D. Hexane
1.11 Which of the following is NOT an example of a fermentation process?
(1)
A. Biagas production
B. Wine and beer production
C. Cheese production
D. Glucose production
1.12 Which levels of classification are included in the binomial system?
(1)
A. Genus and species
B. Phylum and genus
C. Kingdom and class
D. Kingdom and phylum
1.13 The binomial system of classification was developed by;
(1)
A. Darwin
B. Linnaeus
C. Wallace
D. Malthus
1.14 The biological definition of a species __
(1)
A. recognizes that distinctive characteristics that are passed from parent to offspring
B. states that members of a species interbreed
C. says that members of a species share the same gene pool
D. all of the above
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1.15 Organisms that have the ability to use an atmospheric gas to produce an organic
nutrient are known as;
(1)
A. herbivores
B. decomposers
C. carnivores
D. autotrophs
1.16 Disaccharides are produced during the process of;
(1)
A. Hydrolysis
B. Condensation
C. Hydrogenation
D. Polarization
1.17 Which of these statements describes enzymes?
(1)
A. They control the transport of materials.
B. They provide energy for chemical reactions.
C. They affect the rate of chemical reactions.
D. They absorb oxygen from the environment.
1.18 Which of these phrases is an example of autotrophic nutrition?
(1)
A. a cow eating grass in a field
B. a mushroom digesting a dead log
C. an apple tree making its own food
D. a tapeworm feeding in the body of a dog
1.19 Using the traditional five kingdom system of classification, a prokaryotic organism
is classified as a --
(1)
A. Fungus
B. Monera
C. Protist
D. Animal
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1.20 The domain Eukarya contains ___ kingdoms.
(1)
A. One
B. Two
C. Three
D. Four
QUESTION 2
(15)
2.1 Explain the difference between glycogen and glycerol.
(2)
2.2 Explain the production of trans fats and why it is unhealthy.
(4)
2.3 Explain how energy is lost from one trophic level to the other.
(2)
2.5 List two ecological pyramids.
(2)
2.6 List the five steps used to make beer.
(5)
SECTION B: CHEMISTRY
[30]
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 How many significant figures are in 100.50 m?
( 1)
A. 3
B.4
C. 5
D. 1
3.2 How many significant figures are in 250 000 years?
(1)
A. 5
B. Exact
C.2
D. 6
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3.3 Which of these options is a heterogenous mixture?
( 1)
A. Air
B. Blood
C. Rain
D. Both A and B
3.4 Which of these options is a homogenous mixture?
(1)
A. Air
B. Rain
C. Blood
D. Both A and B
3.5 The following chemical reaction takes place to give a substance that is familiar to
almost everyone in the world i.e Sodium chloride or table salt:
2Na(s) + C'2(g) ---+ 2NaCl(s)
(i) Identify the reactant (s)
(1)
A. Na and Cl
B. Na
C. Cl
D. NaCl
(ii) Identify the product (s)
(1)
A. Na and Cl
B. Na
C. Cl
D. NaCl
3.6Which of the following options is a solvent?
(1)
A. Table salt
B. Hydrogen
C. Water
D. Oxygen
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3.7 A process which involves the output of energy or release of heat is called?
(1)
A. Exothermic
B. Dissolving
C. Endothermic
D. Thermodynamic
3.8 Hydrogen is an example of a sample of matter classified as;
(1)
A. Compound
B. Homogeneous mixture
C. Heterogeneous mixture
D.Element
3.9 In relations to composition, a saturated solution contains
(1)
A. A lot of solute in a given amount of solvent
B. More solvent in a given amount of solute
C. As much solute as the given amount of solvent
D. None of the above
3.10 The two phase changes involved in simple distillation are;
(1)
A. Evaporation and condensation
B. Evaporation and deposition
C. Evaporation and sublimation
D. Evaporation and melting
3.11 The weather forecast for Tuesday was estimated to be 28.4°C . What reading would
this temperature give in degree Fahrenheit?
(1)
A. 543.2 Of
B. 83.12°F
C. 83.1 °F
D. 543 °F
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o- 3.12 Convert this number to PROPER scientific notation: 0.000780 x 1 8
(1)
A. 7.80 X 10-12
B. 7.80 X 10-11
C. 7.80 X 10-4
D. 7.80 X 10-5
3.13 The answer to the calculation below should be reported to how many significant
figures? (97+19.5)/434.97= __
(1)
A. 2
B.3
C.4
D. 5
3.14 Which distance measurement below is the longest?
(1)
A. 795 µm
B. 0.003 km
C. 45,000 nm
D.1,100mm
3.15 SI unit for temperature is:
(1)
A. oc
B. °F
C. °K
D.K
3.16 Which of these statements is correct about the Alkali metals group on the Periodic
Table?
(1)
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.
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o- 3.17 If concentration of H+ is equal to 1 x 1 7, then solution is;
(1)
A. neutral
B. basic
C. acidic
D. aqueous
3.18 The identity of a particular element on the Periodic Table is determined by the; (1)
A. number of electrons in the shell
B. number of protons and neutrons in the nucleus
C. number of protons in the nucleus only
D. number of protons, neutrons and electrons
3.19 Sodium hydrogen carbonate is used in the following;
(1)
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.
QUESTION 4
(10)
Question Types: Brief statement responses.
4.1 Provide definitions for the following terms:
(4)
a. Atom
b. Significant figure
c. Element
d. Neutralization
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4.2 Use your knowledge of atomic calculations to complete the following table.
Note:
Symbol = massno.EJementnectharge
(3)
Symbol
Protons
Neutrons
Electrons
Mass
number
Net
Charge
(i) --
35
45
(ii)
(iv)
--
0
aosr -1
35
45
(iii)
80
(v)_
4.3Classify each of the following options as an element or compound:
(1)
a. water: ---
b. oxygen: __ _
4.4 Name the products obtained from the following reaction:
(1)
Acid + Metal ----
4.5 Perform out the following calculation and provide the answers to the correct number
of significant figures:
(1)
0.237 X 6.792 =
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SECTION C: PHYSICS
(35]
QUESTION 5:
(20)
Question type: Multiple choices. Read the questions carefully, choose and write the
correct letter. Each question weighs 1 mark.
5.1 Consider the following acronym T.A. I.LS. Which one of these options is NOT
correct?
( 1)
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.
5.2 Newton's third law of motion is also called:
(1)
A. Inertia
B. Acceleration
C. Action and reaction
D. Law of speed
5.3 When a bus starts suddenly, the passengers are pushed back. This is an example
of which of the following options?
(1)
A. Newton's first law of motion
B. Newton's second law of motion
C. Newton's third law of motion
D. None of the above-mentioned laws.
5.4 What is the mass of an object that requires a force of 90 N to accelerate at a rate of
2.6m/s 2?
(1)
A. 44.6 kg
B. 34.6 kg
C. 54.6 kg
D. 74.6 kg
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5.5 Upon catching a ball, a cricket fielder swings his hand backwards. The concept
behind this is explained by;
(1)
A. Newton's first law of motion
B. Newton's second law of motion
C. Newton's third law of motion
D. The law of inertia.
5.6 Rock climbers pulling their vertical rope downwards to push themselves upwards is
an example for which law of motion?
(1)
A. Newton's first law of motion
B. Newton's second law of motion
C. Newton's third law of motion
D. None of the above.
5.7 An airplane is flying horizontally at an altitude with a uniform velocity. Then the net
force acting on the airplanes is;
(1)
A. acting vertically upwards
B. acting vertically downward
C. in the forward direction
D. zero.
5.8 An object is released from rest and falls in the absence of air resistance. Which of
the following options is true about its motion?
(1)
A. Its acceleration is zero.
B. Its acceleration is constant.
C. Its velocity is constant.
D. Its acceleration is increasing.
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5.9 Which of these options is the formula for calculating acceleration?
(1)
A. Acceleration
mass
velocity
B. Acceleration
force
mass
C. Acceleration
mass
force
= D. Accelerat1.0n
mass
distance
5.10 A car of mass 2000 kg can produce a force of 8000N by the engine. Calculate the
acceleration of the car.
(1)
A. 8 m/s 2
B. 4 m/s 2
C. 10 m/s 2
D. 100 m/s 2
5.11 Energy possessed by a body virtue of its motion is called;
(1)
A. Physical energy
B. Potential energy
C. Kinetic energy
D. geothermal energy
5.12 Which of the following below is an example of non-renewable energy?
(1)
A. Wind energy
B. Geothermal
c. Nuclear energy
D. Biofuels
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5.13 In geothermal energy, ___ produced from underground rocks is used to drive
turbines, which drive electric generators to produce electricity.
(1)
A. water
B. steam
C. dust
D. fire
5.14 Energy involved in creating work gets __ _
(1)
A. used up
B. transferred
C. exhausted
D. lost
5.15 Which of the following instruments is used to measure an electric voltage?
(1)
A. Voltmeter
B. Galvanometer
C. Ammeter
D. Potentiometer
5.16 The electrical symbol in figure 5.1 below represent which of the following.
(1)
A. Rheostat
B. Lamp
C. Galvanometer
D. Millimeter
Fig. 5.1
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5.17 Which of the units given below is the SI unit of resistance?
(1)
A. Ampere
B. Volt
C. Ohm
D. Watt
5.18 The process by which the nuclei of a nuclide emit a, {Jory ray is known as;
(1)
A. Transmutation
B. Radioactive Decay
C. Isotopes.
D. Nucleons.
5.19 Both mass and atomic numbers are not changed by radioactive emission of; (1)
A. Beta
B. Gamma
C. Alpha
D. The atomic number is affected by all forms of radioactive decay.
5.20 Isotopes of an element have a different number of;
(1)
A. proton
B. neutron
C. electron
D. atom
QUESTION 6
(15)
6.1 What do you understand by the term non-renewable energy?
(2)
6.2 State two advantages and disadvantages each of using fossil fuels?
(4)
6.3 Define radioactive decay.
(2)
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6.4 A radioactive Polonium-218 decays to Radon-218 by beta emission as shown. (3)
6.5 A heating coil marked 1000 Wis used to heat water for 15 minutes. Calculate; (4)
energy given out in joules.
END
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PERIODIC TABLE OF THE ELEMENTS
18
l
2
H
1.00794
2
13
14
15
He
16
17 4.00260
3
4
5
6
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
Na Mg
22.9898 24.305 3
4
5
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
....
00
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
-0
Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
OJ
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 l 18.69 121.75 127.6 126.9 131.29
OU
(1)
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 t 83.85 186207 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) 226.025 (260) (261) (262) {263) {264) (265) 1(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)