namibia UniVERSITY OF SCIEnCE AnD TECHnOLOGY

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1 ' I namibia UniVERSITY OF SCIEnCE AnD TECHnOLOGY FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES QUALIFICATION: QUALIFICATION CODE: LEVEL: 4 COURSE CODE: BSC410S COURSE NAME: BASIC SCIENCE SESSION: JUNE 2016 PAPER: THEORY DURATION: 3 HOURS MARKS: 100 FIRST OPPORTUNITY EXAMINATION QUESTION PAPER EXAMINER($) MR. VAINO INDOGO, MR. VICTOR UZOMA AND MRS SELMA IMENE-SCHUTI MODERATOR: PROF. HABAUKA M. KWAAMBWA INSTRUCTIONS 1. Write all your answers in the answer booklet provided, use black/blue ink pen only. 2. Read the whole question before answering 3. Begin each question on a new page PERMISSIBLE MATERIALS Scientific Calculator ATTACHMENT Periodic Table THIS QUESTION PAPER CONSISTS OF 13 PAGES (Including this front page and attachment)

2 SECTION A: BIOLOGY [35] QUESTION 1 (15) Question Type: Multiple Choice Questions. Each question equals 1 mark. 1.1 Of the six kingdoms now recognized, A. two are plants and four are animals B. four are eukaryotes and two are prokaryotes C. four are macroscopic and two are microscopic D. two are eukaryotes and four are prokaryotes 1.2 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? A. Growth and reproduction B. Cellular organization and use of energy C. Reproduction and response to environment D. Use of energy and development 1.3 Fungi that obtain their food directly from organic matter are called; A. Autotrophs B. Mutualists C. Heterotrophs D. Saprotrophs 1.4 An organism's scientific name consists of its A. Its class name and its family name B. Its kingdom name and its phylum name C. Its genus name and its species name D. Its phylum name and its species name 1.5 Dioecious plants have; A. Separate male and female flowers on the same plant B. Separate male and female flowers on different locations on the same plant C. Separate male flowers on one plant and female flowers on another plant. D. Same male and female flowers on different location on different plant. 1.6 A diet high in saturated fats can be linked to which of the following? A. kidney failure B. rickets C. anorexia D. cardiovascular or heart disease 2

3 1.7 A mineral that the body needs to work properly especially to absorb Vitamin Dis A. calcium B. iron C. magnesium D. lead 1.8 Fibre cannot actually be digested; however, it is an important part of our diet for various reasons. One of the following reasons is wrong, identify which. A. As it remains undigested it passes through the entire gut from mouth to anus and thus keeps food moving smoothly through our system. B. It causes constipation. C. The fibre absorbs poisonous waste from the digested food. D. High fibre diets are believed to reduce the risk of heart disease, bowel cancer and cholesterol in the body. 1.9 The three types of carbohydrates are A. glycerol, polysaccharide, monosaccharide B. disaccharide, monosaccharide, glycerol C. glycerol, monosaccharide, polysaccharide D. monosaccharide, polysaccharide, disaccharide 1.10 Glycogen, a polysaccharide, in your liver may be broken down to glucose by the process of A. hydrolysis B. dehydration synthesis C. condensation D. isomerization 1.11 The three macronutrients are A. monosaccharide, polysaccharide, disaccharide B. fibre, vitamins, proteins C. carbohydrates, lipids, glycerol D. lipids, carbohydrates, proteins 1.12 About 50-60% of the human body weight consists of water. One of the following is NOT a function of water in the human body: A. acts as a solvent for nutrients B. helps regulate the body temperature C. clots the blood D. participates in chemical reactions 1.13 All the following statements for the main uses of fermentation are true EXCEPT: 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 3

4 1.14 A diet lacking Vitamin D and calcium can be linked to which of the following? A. kidney failure B. scurvy C. osteoporosis D. cardiovascular disease 1.15 The organic and inorganic materials in all the organisms will eventually return to the environment by the action of: (1} A. primary consumers B. producers C. decomposers D. secondary consumers QUESTION 2. [20) Question Type: Structured Questions. 2.1 Provide the 3 economic importance of Conifers Plants (6} 2.2 What is the ecological importance ofthe Decomposers in an ecosystem? (2} 2.3 Give 2 reasons why animals or plants may become endangered of extinct. (4) 2.4 Explain the food types you would recommend for an individual with the following symptoms. Justify your answer. (a) Bleeding gums (2} (b) Low hemoglobin content (2} (c) Oesteroposis 2.5 Explain why taking antibiotics for a long period oftime may lead to vitamin K deficiency? (2} SECTION B: CHEMISTRY [35] QUESTION 1 {15) Question Type: Multiple Choice Questions. Each question equals 1 mark. 1.1 The two physical quantities that define any sample of matter are; A Weight and volume B. Mass and Weight C. Mass and Volume D. Volume and Area (1} 4

5 1.2 Sublimation is the transformation of a state of matter from a; A. Solid to a liquid B. Liquid to gas C. Solid to gas D. Gas to liquid 1.3 An appropriate physical method that can be used to separate two liquids with different boiling points is; A. Chromatography B. Simple distillation C. Separating funnel D. Fractional distillation 1.4 Which one of the following transformations is a suitable example of a chemical change? A. Melting steel B. A plant growing C. Chopping wood D. None of the above 1.5 is an example of an intensive physical property. A. Density B. Mass C. Volume D. All of the above 1.6 Which of the following samples of matter is NOT classified as a compound? A. Blood B. Water C. Salt D. Sugar 1.7 Which of the following is NOT a characteristic of a mixture? A. No definite composition B. Cannot be separated physical and chemically C. Retain the original properties D. None of the above 1.8 The process of condensation is classified as an process and involves the in energy of the particles which make up the sample of matter. A. Endothermic and increase B. Exothermic and increase C. Endothermic and decrease D. Exothermic and decrease 5

6 1.9 In terms of the Kinetic Theory of Atoms, the intermolecular force between atoms when a solid is transformed into a liquid. A. Increase B. Decrease C. Remain the same D. Equals zero 1.10 How does the presence of an impurity affect the freezing point and boiling point of water? A. Raises the freezing point and lowers the boiling point B. Lowers the freezing point and lowers the boiling point C. Lowers the freezing point and raises the boiling point D. Raises the freezing point and raises the boiling point 1.11 When salt dissolves in water, the water is the A. solute. B. solvent. C. solubility. D. solution If the solute particles in a solution are large enough to be seen and to be filtered, the mixture is a (an) A. colloid. B. true solution. C. electrolyte. D. suspension n a mixture of salt dissolved in water, the solute is A. the salt. B. the water. C. separated by filtering. D. the precipitate All of the following processes will increase the rate of dissolving a solid in a liquid EXCEPT for A. powdering the solid. B. cooling the solution. C. heating the solution D. stirring the solution 1.15 Which ofthe following describes the carbon dioxide component of a carbonated beverage? A. Solvent B. Precipitate c. Solution D. Solute 6

7 QUESTION 2 {20) Question Type: Structured Questions. 2.1 In each of the following lists, identify the two terms which are related and provide an explanation as to either why the two terms you have chosen are related or why the third is not related. (3) a. Kelvin, Decimetre and Kilometre b. Kilogram, Cubic centimetre and litre c. Time, Distance and seconds 2.2 Perform the following mathematical operations and express each of the answers in scientific notation. a. (2.74 X 10 3 )- (4.22 X 10 5 ) + (6.35 X 10 4 ) b. [6.48X105] X (1.8 X 108) 2.4X Differentiate between the terms accuracy and precision. 2.4 Using a Kelvin thermometer, the temperature in a freezer was recorded to be 169 K. Convert the temperature to Degree Celsius loq and Fahrenheit ( F) using the appropriate formulae. 2.6 Carry out the following calculations and record the answer to the correct number of significant figures or where applicable, to the correct number of decimal places. (3) a. {0.250 I 25.00) x b c. { ) 1 { ) 2.6 Apply the rules of rounding off numbers and round off the numbers below to the number of significant figures stated. {2) a. Round off nm to two significant figures b. Round off g to three significant figures 2.7 The diagram below shows the electron arrangements of magnesium and oxygen: 7

8 a) Draw a diagram showing how a bond is made between magnesium and oxygen. {2) b) What name is given to this type of chemical bond? {1) 2.8 a) What type of chemical bond would you expect in hydrogen fluoride/ HF? {1) b) Draw a diagram to show how this bond is formed. {2) SECTION C: PHYSICS [30] QUESTION 1 (15) Question Type: Multiple Choice Questions. Each question equals 1 mark. 1.1 Which one is a renewable source of energy? A. nuclear energy B. natural gas C. hydroelectric energy D. coal 1.2 The correct order for generation of electricity from nuclear energy is {1) A. supply electricity> heat water to make steam >steam turns turbines> electrical power sent around the country B. Fusion of uranium> heat water to make steam> steam turns turbines> electrical power sent around the country C. Fission of uranium >heat water to make steam> steam turns turbines> electrical power sent around the country D. Crushing of uranium Fission of uranium heat water to make steam >steam turns turbines> electrical power sent around the country 1.3 Which of the following is true for fossil fuels? {1) A. It is obtained from remains of plant and animal materials. B. It can also be generated from biomass C. It is a tidal source of energy D. It can kill flocks of birds. 8

9 1.4 Peter uses energy of 800 J to carry a suitcase upstairs, a distance of 4 m. Assuming the acceleration due to gravity is 9.81 m/s/s, Find the mass of the suitcase. A. 20g B kg c g D kg 1.5 A 2500 gram Ball is thrown into the air with an initial velocity of 30 em/sec. Which statement is true about the ball when it reaches the top of its ascent? A. Kinetic energy is at its highest B. The kinetic energy is equal to gravitational energy. C. The ball does not have energy at this position. D. Total energy is equal to potential energy of a ball. 1.6 During the ascent phase of a rep of the bench press, the lifter exerts an average vertical force of 200 N against a barbell while the barbell moves 0.8 m upward. How much work did the lifter do to the barbell? BEilCH-PRESS A. 0.8J B. 200 J c. 800 J D. 160 J 9

10 1.7 This graph shows a ball rolling from A to G. The ball starts at point A and rolls through to point G. Which letter shows when the ball has the highest potential energy? {1) A. A only B. D and G C. C and E D. D and A 1.8 A cart at the top of a 0.3 Km hill has a mass of 500 g? Assume that acceleration due to gravity is 10m/s/s. t 0.3km 1 What is the cart's gravitational potential energy? {1) A. 150 J B J c J D Nm (Use information from question 1.8) Assuming that energy is conserved and there is no friction, what is the speed at the bottom of the hill. {1) A.137 m/s B. 173 m/s C. 173 m/s/s D m/s 10

11 1.10 Law of Conservation of Energy states that; A. Energy can be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes. B. Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes. C. A. Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy changes. D. Energy can be created or destroyed; it may be transformed from one form into another, but the total amount of energy changes A disturbance that transfers energy through a medium from one location to the other is known as A. Gas B. Sound C. Potential energy D. Wave 1.12 Waves that are produced by means of charged particle accelerations are: A. Mechanical waves B. Ocean waves C. Electromagnetic waves B. S-Type earthquake waves 1.13 Which type of wave vibrates forming 90 to the direction of motion of the wave? A. Transverse wave B. Longitudinal wave C. Both transverse and longitudinal wave D. None of the above A distance between any two repeating points on a wave A. Amplitude B. Wavelength C. Velocity D. Frequency What is the wavelength of a sound wave with a frequency of 0.05 KHz? (Speed of sound is 900 km/h). A. 230m B. 50 Hz C. 250 m/s D. 5 m 11

12 QUESTION 2 (15) Question Type: Structured questions 1. An experiment carried out in the physics laboratory to determine the rate of change of velocity has the following results presented in graphical form below. Using the diagram answer the following question: a. State the two important pieces of information missing from the graph? Information 1 is (i) Information 2 is (ii) b. From the question above, identify the independent variable and the dependent variable. Independent variable is (i) Dependent variable is (ii) c. The equation of a straight line is given by; Y = MX + C (i) From the equation above, what does the letters "M" and "C" mean? M meaning: C meaning: (ii) What quantity of measurement does M represent? State the 51 units for this quantity of measurement. Quantity is (i) 51 units is (ii) (iii) From the graph above, what is the value of C? Value of Cis (iv) At what time is the velocity= 2? 12

13 2. An applied force (Fapp) of 75 N is used to accelerate an OBJECT A to the right across a frictional surface. The object encounters 10 N of friction (Ffrict)... Fnorm - Ffrict = 1 ON.. OBJECT ' A.. r Fapp = 75 N "' I" Fgrav Use the diagram above to determine the: (a) Normal force, Fnorm 80 N (b) Net force, Fnet 3. Define the term vector. END 13

14 M セ H Periodic Table H He Li Be B c N 0 F Ne Na Mg AI Si p 5 Cl Ar K Ca Sc Ti v Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe (98) Cs Ba La Hf Ta w Re Os lr Pt Au Hg Tl Pb Bi Po At Rn (209) (210) (222) Fr Ra Ac Rf Db Sg Bh Hs Mt (289) (223) (226) (227) (261) (262) (263) (262) (265) (266) (269) (272) (277) (287) (289)_ L_(25)3) Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu (145) Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No Lr (237) (244) (243) (247) (247) (251) (252) (257) (258) (259) (262)