QUALIFICATION:

POLYTECHNIC OF NAMIBIA

SCFfOOL OF HEALTH AND APPLIED SCIENCES

DEPARTMENT OF NATURAL AND APPLIED SCIENCES

QUALIFICATION CODE: LEVEL: 4

COURSE: BASIC SCIENCE COURSE CODE:

DATE: SESSION:

DURATION: 3 HOURS MARKS:

RECTOR'S EXAMINATION QUESTION PAPER

Examiners: Dr. Jeya Kennedy, Mr. Sylvanus Onjefu and Dr. Marius Mutorwa

Moderator: Dr. Habauka Kwaambwa

THIS QUESTION PAPER CONSISTS OF 8 PAGES

(EXCLUDING THIS FRONT COVER, PERIODIC TABLE)

READ THESE INSTRUCTIONS FIRST

1. Write in dark blue or black pen on the answer paper.

2. You may use a soft pencil for any diagrams or rough working.

3. Write neatly and clearly.

BSC410S

130

4. The number of marks is given in brackets() at the end of each question or part question.

5. No books, notes and other additional aids are allowed.

6. Only a scientific calculator is allowed.

7. The Periodic Table is provided (attached).

8. Answer All Questions.

9. Use 51 Units for answers.

SECTION A: BIOLOGY- TOTAL MARKS: SO

QUESTION 1: Multiple Choices (5]

1.1 After fertilization, t he _ ____ develops into a fruit and t he _____ _

develops into a seed. (1)

a) ovary; ovule

b) polar nuclei; ovule

c) ovary; endosperm

d) ovule ; ovary

e) ovule; polar nuclei

1.2 When ecologists study the abiot ic components of the environment, they are studying

(1)

a) all organisms

b) all predators

c) soi l, water, and weather

d) all organisms, soil, water, and weather

1.3 Sucrose is the most common example of _ ____ _ (1)

a) Monosaccharides

b) Disaccharides

c) Polysaccharides

d) Oligosaccharides

1.4 What mineral is essential for healthy teet h and bones? (1)

a) Calcium

b) Iron

c) Zinc

d) Potassium

1.5 What are the two important by-products of fermentation? (1)

a) Carbon dioxi de and alcohol

b) sugar and alcoho l

c) oxygen and carbon dioxide

d) sugar and oxygen

QUESTION 2 [5]

Fill in the blank spaces

2.11n incomplete metamorphosis, young anim als look like the ____ _ w hen they

hatch f rom eggs. (1)

2.2 The ____ is the smallest unit of life. (1)

1

2.3 A complex of interconnected food chains in an ecosystem is called a (an) ____ . (1)

2.4 Animals st ore carbohydrates in the form of ____ _ (1)

2.5 ______ is a physical process for sewage treatment. (1)

QUESTION 3 [16.5]

3.1 What did Linnaeus contribute to taxonomy? (1)

3.2 Why it is important to classify organism? (2)

3.3 In the tabular form, write the differences between Kingdom Fungi and Kingdom Plantae.

(2)

3.4 The diagram below shows a well-known gymnosperm found throughout the Namib

Desert.

State the scientific name of the plant. (1)

3.5 In the tabular form, compare the eggs of frogs, snakes and chickens. (3)

3.6 The diagram below shows a cross section through a flower.

Complete A -E (2.5)

2

a} Indicate whether the flower is an angiosperm or gymnosperm?

b) Give ONE reason to support your answer.

3. 7 State the Kingdom to which the following are assigned:

(1)

(1}

a} Euglena (1}

b) Bacteria {1}

c) Saccharomyces cerevisiae (1}

QUESTION 4 [7.5)

4.1 Distinguish between consumers, detritivores and saprotrophs. (3}

4.2 Name the two types of parasites. (2}

4.3 Define symbiosis and name the type of symbiosis. {2.5}

QUESTION 5 [9]

5.1 Li st any one general functions in the body for each of the macronutrients. (3)

5.2 Name 2 building blocks of any lipid. (1)

5.3 Write one reason why each of the following is important in t he diet: (5}

a) Vitamin C

b) Vitamin A c) Ca lcium d) Iron e) Iodine

QUESTION 6

6.1 Describe the process known as malting in beer production?

6.2 Name any three health benefits of yogurt.

[7]

(4)

(3)

3

SECTION B: CHEMISTRY- TOTAL MARKS 40

QUESTION 7

7.11n t erms of kinetic theory, discuss how the change in temperat ure influences t he

behaviour of atoms when a liquid vaporises into a gas.

[10]

(3)

7.2 A sample of matter can be classified as an element, compound, heterogeneous mixture

or homogeneous mixture. Briefly def ine the terms:

a. Compound

b. Heterogeneous mixture (2}

7.3 Name the process w hen t he fo llowing changes in t he state of matter occur and indicat e

whether the change in state is an endothermic or exothermic process.

a. Liquid into Solid

b. Solid into Gas (2}

7.4 Indicate which physical separat ion technique you would use to separat e t he following

mixtures.

Note: the component of interest is marked in bold.

a. Water from a Potassium ch loride solution

b. Water from a Calcium carbonate suspension

(2}

7.5 Arrange the different states of matter (solid, gas, liquid) fo r a given substance in terms

of increasing intermolecu lar spaces.

QUESTION 8

(1}

[11]

8.1 Provide definitions for the following terms used in measurements.

a. Unit

b. Precision

(2}

8.2 Perform the following mathematical operations and express each of the answers to the

correct number of significant figures or w here applicable, to t he correct number of

decimal places.

a. 8.86-0.345 + 22.4

4

b. 4270 X 1.005

c. {120.25 -110.75} I (6.025 -3.075}

8.3 How many signif icant figures does each of the following measurements have?

a. 0.000250 m

b. 1 200 000 ml

c. 3.025 em

d. 300 200 Kg

8.4 Using a Fahrenheit thermometer, the melting point of a sample of nickel metal was

experimentally determined to be 2650.8 °F.

a. Convert the melting point temperature, using the ap propriate formula, into

Degrees Celsius (0 C} and Kelvin (K)

Note: For question a, record your answer to four significant figures

{3)

(2)

(3)

b. Convert the answer in Kelvin temperature in (a) into standard scientific notation . {1)

QUESTION 9 [11]

9.1 What is the difference between a metalloid and an alloy? (2}

9.2 Use the clues (marked in bold) and the periodic Table provided, identify the element

being described and fill in the missing information (a- f).

The element has 1 valence electron and is found in period 4 on the Period Table. The

element has .@lelectrons. in its neutral state. The name of element is ihl_ and its symbol

is ifl_ . The element has @ protons and_ \e) _neutrons in the nucleus. The element is

classified as a .J)_.

{6}

9.3 Discuss the structure of the atom according to Bohr's theory and specify which of the

sub-atomic particles determine the overall mass and overall size for an atom.

QU ESTION 10

10.11n agriculture, it is important to monitor the pH of the soi l to ensure the growth of

crops. State how you would treat soil that is:

a. Too acidic

{3}

[8]

{1)

5

b. Too basic

10.2 Fill in the products formed in the follow ing reactions:

a. Ca(OHh + H2S04 __ __.. ___ + ----

b. K + HCI -----+ _ ___ + ____ _

10.3 List two physical properties of an alkali.

(1)

(1)

(1)

(2)

10.4 Complete the following table by providing the name and formula of the inorganic

compound.

Chemical name Formula

(a) Ca(OCih

Sodium hydrogen carbonate (b)

SECTION C: PHYSICS-TOTAL MARKS: 40

QUESTION 11

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 co lumn graph of average percentage against group.

QUESTION 12

(2)

[6]

[9]

a. What amount of energy is said to be expended by a young boy who was given a st one of

250 grams while he was standing upright? If he never took a step when given the stone, wil l

this young boy be said to have expended energy? Give a reason for you r answer. (2)

b. State the energy transformation which occurs when;

(i). A car is brought to rest by its brakes.

(ii). An orange falling from a tree.

(iii). A telephone.

(1)

(1)

(1)

c. List four practica l ways of saving energy so we use less of the earth's energy resources. (4)

6

QUESTION 13 [7]

a. Explain the term electromotive force. (1)

b. State the differences between conventional current and electron flow. (2)

c. Calculate the effective resistance shown in the figure. (4)

1ohm's

!Ohm's lohm's

l ohm's

QUESTION 14 [8]

a. Define radioactive isotope. (1)

b. Complete the table. (5)

Types of Radiation Penetrating power Magnetic Deflection What is it with magnet

Gamma (i) ........................... (ii) ...... ......................... . Electromagnetic wave.

Very short wave length

Very high energy

{til) ...................... Goes through thin Large deflection High energy electrons paper (negative charged)

(iv) .................. ... ... Will not go thin paper (v) ............... ..... .... ...... Positively charged helium nucleus 4

2He

Can be stopped by a few centimetres of air

c. Briefly explain how radiation is applied in the process of steri lization. (2)

7

QUESTION 15 [5)

a. Briefly explain what happens when t he elastic limit of an elastic body is exceeded. (2)

b. Determine the magnitude and direction of the resultant force. {2)

10N -.1- and 4N 1'

c. Explain the term inertia. {1}

QUESTION 16 [5)

a. Define the term Wave. (1)

b. Differentiate between a crest and trough. {2}

c. Determine the frequency of a wave of wavelength 300m, if the velocity of the wave is 3 x

108 m/s.

{Final answer should be in MHz}. {2}

8

- - - - - . - . . ·- . . . . . - .. .. . -h)Uogen helium

1 2

H He 1.0079 4.0026 llhh.m beryllum bOron C31X>n nilrOOjell OX)'!Iell IIWiine neon

3 4 5 6 7 8 9 10

Li Be 8 c N 0 F Ne 6.941 9.0122 10.811 12.011 14.007 15.999 18.998 20.100

sodll.m lllO!JlOSlJm <llumililfll slicoo phosphorus staur chlorine argon 11 12 13 14 15 16 17 18

Na Mg AI Si p s Cl Ar 22.990 24.305 26.982 28.086 30.974 32.065 ﾷｾＮＴＵＢｬ＠ >9.948

potasslt.m calclt.m scandlJm lllonlJm vanadlJm chromiLm nl:lllgancso Iron cobnll nickel copper zi1c galllJm oennanlJm arsenic selenium a-oolnc ｾｉｙｐｉｏｮ＠

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 "l9.098 40.078 44.956 47.867 50.942 51.996 54.938 55.845 56.933 56.693 6l.5<16 65.39 69.72l 72.61 74.922 78.96 79.904 83.80

rullldlJm slrontum y11rlJlll uconlum niobi.Jm rrolybdont.m technetltm ruthenium rhcdium p:lll:ldlum silver c.-.dmilln nctium lin ontlmony telurium iodine xenon 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 85.468 87.62 88.906 91.224 92.906 95.94 tOOl t01.07 102.91 106.42 107.87 112.4 1 114.82 118.71 121.76 127.60 12G.90 131.29

caesllln bM1111 lutetium halnl1111 tnnlolurn lungs ten rhenium osmium lrldium platinum QOkJ ln!lfCUI)' thallium toad bismuth polonltan IJS1:ltill0 rn<Jon 55 56 57-70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

Cs Ba * Lu Hf Ta w Re Os lr Pt Au Hg Tl Pb Bi Po At Rn 132.91 137.33 174.97 178.49 180.95 183.84 186.21 190.23 192.22 105.2£ 196.97 200.59 20438 207.2 208.98 (2091 m01 122?1

lronciJm rodlll11 lawrenCium ru therloo:Ji.Jn dubnlum senborglum bohrlJm has slum n1ellnerum urunnllium unuruntum IJlUrbiiJn ununqu3tlum 87 86 89-102 103 104 105 106 107 108 109 110 111 112 114

Fr Ra ** Lr Rf Db Sg Bh Hs Mt Uun Uuu Uub Uuq 12231 12261 )2621 12G1t 12621 12GGI 12641 12691 12661 12711 12721 12771 12891

* Lanthanide series lonlhar-um oorlJrn pr.,.eoayniun neodymlJm prorneUtlum ｳＺｭｮｾＱＱｮ＠ (!UfOj)Jutll gOdOIItiutll lefblutll dysprosium holmiUin CIIJIIJ11 thtMUin yltetllrum

57 58 59 GO 61 62 63 64 65 66 67 68 69 70

La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb 138.91 140.12 140.91 144.24 ＱＱＴ ｾ＠ 150.36 151.9G t57.25 15ll.9l 162.50 164.93 167.26 168.93 t73.0•t

XlhltJtt lhonum prOiodlnum tl"onllm neptunlJrll Piulonium ornericklm OJrlJtn b«kellJtll canomklm elnsleitltJn lermlum mendeloviJrn 1\0bellum 89 90 91 92 93 94 95 96 97 96 99 100 101 102 ** Actinide series

Ac Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No 12271 232.04 7.31.04 2311.03 12371 12441 1243l 12471 12471 12511 12521 12571 12(;81 12591