BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 1 of 12

POLYTECHNIC OF NAMIBIA SCHOOL OF HEALTH AND APPLIED SCIENCES

DEPARTMENT OF NATURAL AND APPLIED SCIENCES

NQF LEVEL: LEVEL 4

COURSE NAME: BASIC SCIENCE COURSE CODE: BSC410S

DATE: NOVEMBER 2015 DURATION: 3 HOURS MARKS: 100

EXAMINATION QUESTION PAPER 2 (Full-time and Part-time Mode)

EXAMINER(S): Dr. Martha Uumati, Dr. Euodia Hess and Mr. Vaino Indongo MODERATOR: Dr.Habauka Kwaambwa

INSTRUCTIONS:

1. Answer all the questions in the booklet provided

2. Show clearly all the steps used in the calculations

3. All written work MUST be done in blue or black ink and sketches must be

done in pencils.

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

5. Answers must be in SI units unless otherwise stated.

PERMISSIBLE MATERIALS

1. Non-Programmable Calculator

This paper consists of 12 pages including this cover and the Periodic Table

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 2 of 12

SECTION A: BIOLOGY QUESTION 1 [10]

Question Type: Multiple Choices. Each answer equals 1 mark. 1.1 Which is the correct order for increasing complexity? (1)

A. cells → tissues → organs → organ systems → organism

B. organs → organism → tissues → cells → organ systems C. tissues → cells → organ systems → organs → organism

D. cells → organs → tissues → organ systems → organism

1.2 Of the six kingdoms now recognized; (1)

A. two are plants and four are animals

B. four are macroscopic and two are microscopic

C. four are eukaryotes and two are prokaryotes

D. two are eukaryotes and four are prokaryotes

1.3 Nuts, avocados, sesame seeds and olive oil are highest in which type of fat? (1)

A. Monounsaturated

B. Saturated

C. Polyunsaturated

D. None of above

1.4 The cell theory states that cells are; (1)

A. Used to make tissues

B. Simplest units of living things

C. Produced by living things

D. Able to maintain homeostasis

1.5 All the following are main uses of fermentation EXCEPT: (1)

A. It can be used for preservation

B. It can used to breakdown proteins

C. It can be used to change the nutritional value of food products

D. It can be used to create or improve sensory characteristics of foods

1.6 What gives yoghurt a sour taste? (1)

A. Sour milk

B. Lactic acid

C. Fermented fruits

D. Complete fermentation

1.7 Which two parts does a virus contain? (1)

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 3 of 12

A. DNA and RNA

B. a nucleic acid and capsid

C. nucleus and cell membrane

D. capsid and enzyme 1.8 All of the following statements about ecology are correct except; (1)

A. Ecology is the study of the interactions between biotic and abiotic aspects of

the environment.

B. Ecologists may study populations and communities of organisms.

C. Ecology is a discipline that is independent from natural selection and

evolutionary history.

D. Ecology spans increasingly comprehensive levels of organization, from

individuals to ecosystems.

1.9 About 50-60% of the human body weight consists of water. One of the following

is NOT among the functions of water in the human body: (1)

A. Acts as a solvent for nutrients

B. Helps regulate the body temperature

C. Participates in chemical reactions

D. Clots the blood

1.10 You are working for the Environmental Protection Agency considering the

effect of a potentially toxic chemical in drinking water. There is as yet no documented scientific evidence against the chemical, but many suspect it to be a health hazard. Using the Precautionary Principle, what would be a reasonable environmental policy? (1)

A. Establish a contingency fund to handle insurance claims in the event that

the chemical turns out to produce negative health effects.

B. Caution individuals to use their own judgment in deciding whether to drink

water from a potentially contaminated area.

C. Set the acceptable levels conservatively low, and keep them there unless

future studies show that they can be safely raised.

D. Set the acceptable levels at the highest levels encountered, and keep them

there unless future studies demonstrate negative health effects.

E. Establish no regulations until there are conclusive scientific studies.

QUESTION 2 [10] Question Type: Fill in the blank spaces 2.1 The science of describing, naming and classifying organisms is __________. (1)

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 4 of 12

2.2 A substance needed by the body for growth, energy, repair and maintenance is called a _______________. (1)

2.3 The yeast in beer making converts sugars into carbon dioxide and alcohol during the __________ process. (1)

2.4 Complete Table 1 below. (4)

Table 1

Micronutrient Deficiency disease/signs Food source

Vitamin A (i) Milk, liver

Vitamin C Bleeding gums (ii)

(iii) Anaemia Liver

Calcium (iv) Milk

Use Figure 1 to answer Questions 2.5 – 2.7

Figure 1. Simple food web

2.5 The __________ is more likely to be located at the apex of the pyramid of the

biomass pyramid. (1) 2.6 The organic and inorganic materials in all the organisms in the diagram will eventually return to the environment by the action of ______________. (1) 2.7 Rabbits and grasshoppers are known as __________ consumers. (1)

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 5 of 12

QUESTION 3 Question Type: Brief statement responses [20]

3.1 List the seven features that characterise living organisms. (3.5) 3.2 Define the term ‘autotrophs’ and ‘heterotrophs’. And give an example of each. (2) 3.3 Differentiate between self-pollination and cross-pollination. (1) 3.4 The Black Rhino in Namibia is endangered. Give at least 3 reasons why

organisms become endangered or extinct? (1.5) 3.5 Carbohydrates are classified into simple and complex carbohydrates. What are

the three types of carbohydrates? Give an example of each. (3) 3.6 Define symbiosis. Using Table 2, give a short description of the relationship

that exists between the following organisms: (5)

a. Bee and flower b. Rhino and bird c. Child and tapeworm

Table 2

Type of relationship

Species benefits

Species neutral

Species harmed

Bee and flower

Rhino and bird

Child and tapeworm

3.7 How is sweet wine produced? (2) 3.8 What is the main source of dietary fibre? The human body cannot digest fibre;

what are the functions of fibre in a diet? (2)

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 6 of 12

SECTION B: CHEMISTRY

QUESTION 4 [10]

Question Type: Brief statement responses 4.1 A certain element is described in the following manner: The element is a silvery-white lustrous metal. It melts at 649 oC and the density is 1.738 g/cm3. The substance burns in air, producing an intense white light. It reacts with chlorine to give a brittle white solid. It is a good conductor of electricity. Which of these characteristics (represented in bold) are physical properties, and which are chemical properties? (6) 4.2 Classify each of the following samples of matter as a homogeneous mixture, heterogeneous mixture, element or compound. (2)

a. motor oil b. peanut butter

4.3 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. (2) a. Gas into Solid b. Liquid into Solid QUESTION 5 [8] 5.1 Provide definitions for the following terms used in measurements. (2)

a. Unit b. Precision 5.2 In each of the following list, identify the two units which are related and provide

an explanation as to why the remaining unit is not related. (2)

a. mole, gram and candela . b. litre, seconds and cubic metre

5.3 How many significant figures does each of the following measurements have? (2) a. 0.000250 m b. 1 200 000 mL 5.4 Using a Fahrenheit thermometer, the melting pint of a sample of nickel metal was experimentally determined to be 2650.8 oF. Convert the melting point temperature, using the appropriate formula, into Degrees Celsius (oC) and Kelvin (K). (2) Given: oF = (1.8 x oC) + 32 and K = 273.15 + oC

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 7 of 12

QUESTION 6 [6] 6.1 Fill in the gaps (a – h), in the table below. (4)

Note: Symbol = mass no.Element net charge

6.2 Determine whether each of the following statements is true or false. If false, correct it or state why the statement is false. (2)

a. Elements in the same group have the same number of valence electrons and have similar chemical properties.

b. The group number determines the number of electronic shells around a nucleus while the period number determines the number of valence electrons.

QUESTION 7 [6] 7.1 Define the following terms. (2)

a. amphoteric b. indicator

7.2 List two uses for nitric acid. (2) 7.3 Complete the following table by providing the name and formula of the inorganic compound. (2)

Symbol a b 32S2-

Protons 26 c 16

Neutrons 30 d 16

Electrons e 46 f

Mass number

g 119 32

Net Charge 2+ 4+ h

Chemical name Formula

Iron(II)sulphate

NH4NO3

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 8 of 12

SECTION C: PHYSICS

QUESTION 8 [15]

Question Type: Multiple Choices. Two cars run a race against each other as shown in Figure 2. Car A started from rest and attained a speed of 30 m/s in 8 seconds. A minute later, car B started from rest and accelerates uniformly to a speed of 24 m/s in the next 3 minutes and maintained the speed. It then accelerated uniformly to finish the race.

Use Figure 2 to answer Questions 8.1 – 8.3

8.1 Considering the distance travelled by car A, over what distance was the race run? (1) A. 240 m B. 280 m C. 300 m D. 120 m

8.2 Which car was faster in the first 4 seconds? (1)

A. car A B. car B C. both car A and B D. None of them.

8.3 What is happening to car B between time t= 4 seconds and time t= 7 seconds? (1)

A. it was stationary B. it was accelerating uniformly C. it was maintaining a constant speed D. it had broken down.

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 9 of 12

8.4 In the linear equation y = mx + C, the value of m represents and C is the (1) A. the y intercept and the gradient B. the gradient and x –axis intercept C. the gradient and the y axis intercept D. the y intercept and the gradient

8.5 Markus and Luc have decided to change the position of their stove. The two of

them pushed the stove along the floor to the wall. Each of them applied a force of 10 N as shown by the free body diagram below. What is the resultant force? (1)

A. 0 N B. 10 N C. 20 N D. None of the above.

8.6 If the stove in (1.5) is exerting a force of 2m/s/s. what is the mass of the stove? (1)

A. 10 kg B. 15 kg C. 5 kg D. 20 kg

8.7 A sound wave has a frequency of 0.05 KHz and velocity of 1230 km/h. what its

wavelength? (1) A. 683.89 m B. 68.39 m C. 0.6839 m D. 6.839 m

8.8 Which of the following is NOT an example of a transverse waves? (1)

A. sound waves B. water waves C. S earthquake waves D. rope waves

8.9 The amplitude of a wave can be described as _______________. (1)

A. the displacement of the size of the disturbance B. the distance of a repeating unit C. how fast the waves travels D. the cycle of the waves

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 10 of 12

8.10 A type of energy source formed from the fossilized remains of pre-historic plant and animal material (1) A. fossil fuels B. biomass C. biofuels D. geothermal

8.11 Energy produced by the oceans as a result of movements of water flowing back and forth. (1) A. geothermal energy B. heat energy C. hydroelectric energy D. tidal energy 8.12 A gas produced by burning fossil fuels and cause ‘greenhouse effect’ is known as ___________. (1)

A. sulphur dioxide B. natural gas C. oxygen D. carbon dioxide

8.13 When polonium 239 undergo alpha decay, it changes to uranium 235 in a

process known as _____________ . (1)

A. transformation B. fission C. radioactivity D. transmutation

8.14 A beta particle is well known as ___________________. (1)

A. gamma ray B. helium atom C. X rays D. an electron

8.15 The uncharged radiation particle (1)

A. beta particle B. alpha particle C. gamma particle D. cosmic particle

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 11 of 12

QUESTION 9 [8]

9.1 A cart at the top of a 300 m hill has a mass of 420 g, as shown in Figure 3.

Figure 3

a. Assuming that the acceleration due to gravity is 9.8 m/s/s. What is the cart’s gravitational potential energy? (4)

b. Assuming that energy is conserved and there is no friction, calculate the cart’s speed at the bottom of the hill. (4)

QUESTION 10 [7] 10.1 Study the circuit below and answer the following questions.

a. Calculate the resistance in the parallel resistors. (2) b. Calculate the equivalent resistance in the circuit. (2) c. Calculate the total current in the circuit. (3)

THE END

TOTAL: 100 MARKS

BSC410S – BASIC SCIENCE: EXAMINATION QUESTION PAPER 2 – NOVEMBER 2015

Page 12 of 12

hydrogen helium

1 2

H He 1.0079 4.0026 ithii.ITl berytliJm boron carbon rltrogen oxyoen lluorlne neon

3 4 5 6 7 8 9 10

Li Be 8 c N 0 F Ne 6.941 9.0122 10.611 12.011 14.007 15.999 16.998 20.190

sodii.ITl m:g1esklm aumnii.ITl slloon phosphorus siAfur Cl11011ne argon

11 12 13 14 15 16 17 18

Na Mg AI Si p s Cl Ar 22.990 24.305 26.982 2B.OB6 30.974 32.065 35.453 39.948

potassium calcium scanalum titanium vanadium chromium manganese Iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine <rypton

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 39.098 40.078 44.956 47.667 50.942 51.996 54.938 55.B45 5B.933 56.693 63.546 65.39 69.723 72.61 74.922 78.96 79.904 83.80

rubidium slronllum yllrlum zirconium niobium molybdenum lechnellum rulhenlum rhodium polladlum sliver codmlum Indium lin onllmony lellurlum 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 8B.906 91.224 92.906 ｾＵＮ ＹＴ＠ 1981 101.07 102.91 ' 06.42 107.87 112.41 114.82 118.71 121.76 127.60 126.90 131.29

caesium barium lulellum hafnium Janlalum lungs len rhenium osmium Iridium pallnum gold mercury thallium lead bismuth polonium aslallne radon

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 132.91 137.33 174.97 178.49 160.95 183.84 1B6.21 190.23 192.22 '95.08 196.97 200.59 204.38 207.2 208.98 [209t f210t 12221

francium radium lawrencium rutherfordium dubnium seaborgium bohrium hasslum meltnerlum unJnnlllum unununlum ununbium ｵｮｵｮｱｵｾ､ｩｵｭ＠

87 88 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 f2231 f2261 f2621 f2611 f2621 rM" f2641 f2691 f2681 f2711 f2721 r2111 f2891

*Lanthan ide se ri es lanthanum cerum pra seodyrriu rr neo:lymiJm promethiJm sarnarii.ITl el.Joplum oooolnl!m tefbl!m dysprosl!m holm lim efbii.ITl thiAII.ITl yttefbklm

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 138.91 140.12 140.91 H4.24 11451 150.36 151.96 157.25 158.93 162.50 164.93 167.26 168.93 173.04

ocllnlum thOrium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium 'ern11um menaelevlum nobelium

** Actinide series 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 12271 232.04 231.04 238.03 123l 1 12441 12431 12471 12471 12511 _[2521 12571 12561 12591