FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES BSC PROGRAMME NAME.. ST. #:. QUALIFICATION(S): CENTRE:.

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FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES BSC PROGRAMME NAME.. ST. #:. QUALIFICATION(S): CENTRE:. MODE OF STUDY: FM PM DM CLASS VENUE: (FHAS Aud.

1 FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES BSC PROGRAMME NAME.. ST. #:. QUALIFICATION(S): CENTRE:. MODE OF STUDY: FM PM DM CLASS VENUE: (FHAS Aud., or Mining Aud.) COURSE NAME: BASIC SCIENCE COURSE CODE: BSC410S DATE: 12 MAY 2017 DURATION: 2 HOURS MARKS: 90 BASIC SCIENCE TEST 2, SEMESTER 1, MEMO EXAMINER(S): MR. V. INDONGO DR. E. HESS DR. L. MWAPAGHA INSTRUCTIONS: 1. Answer all the questions in this questions paper. 2. For Multiple Choice questions, CYCLE the correct answer with a blue/black INK pen. 3. No books, notes and other additional aids are allowed. 4. A Periodic Table is attached at the back of this question paper. PERMISSIBLE MATERIALS Only a scientific calculator is allowed This paper consists of 10 pages including this cover page and the Periodic Table 1

2 SECTION A: BIOLOGY [30 MARKS] 1. Amino acids that are not synthesized in the body and must be obtained from the diet are called. [2] Essential amino acids 2. A process that destroys pathogens through simple heat is. [2] Pasteurization 3. What gives yoghurt a sour taste? [2] Lactic acid 4. What is the best-known function of vitamin K? [2] Blood clotting 5. How is sweet wine produced? [2] Sweet wine is produced when the fermentation process stops before all of the sugar has been converted into alcohol. 6. Name two commonly used species of yeast in beer making. [2] I. Saccharomyces cerevisiae II. Saccharomyces uvarum / Saccharomyces carlsbergensis 7. The main function of rennet in the manufacture of hard cheese is to. [2] lower the ph of milk and form of curds 8. A starter culture in the food industry is. [2] bacteria that are used in the fermentation of food products 9. What determines whether a mineral is a macromineral or a micro- (trace) mineral? [2] Macrominerals are found in and used by the body in the largest amounts. Microminerals are found in and used by the body in smaller amounts. 10. Define undernutrition and overnutrition. [3] Undernutrition is poor health resulting from the depletion of nutrients due to inadequate nutrient intake over time. Overnutrition is due to the regular consumption of excess calories, fats, saturated fats, and cholesterol. 11. State the three (3) stages of wastewater treatment: [3] I. Primary II. Secondary III. Tertiary 2

3 12. What are the differences between a monosaccharide, disaccharide and polysaccharide? [3] A monosaccharide is a single sugar unit (e.g., glucose, fructose, and galactose). A disaccharide (e.g., maltose, sucrose, and lactose) is a molecule of two single sugar units. A polysaccharide (e.g., starch and fiber) is a long chain of sugar units. 13. State three (3) reasons why sulphites are added during the wine making process? [3] I. Arrest fermentation II. As preservatives to prevent spoilage and oxidation at several stages of the winemaking. III. Protects wine from bacteria. SECTION B: CHEMISTRY 30 MARKS 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 Decimetre and kilometre are related as they measure length/distance. Kelvin is the units for temperature b. Kilogram, Cubic centimetre and litre Cubic centrimetre and litre are related as they measure volume. Kilogram is the units for mass c. Time, Distance and seconds Seconds is the units for time. Distance is not related. 2. Differentiate between the terms accuracy and precision. [2] Accuracy how a series of measurements related to the true value Precision how a series of measurements related to each other 3. Using a Kelvin thermometer, the temperature in a freezer was recorded to be 169 K. Convert the temperature to Degree Celsius ( o C) and Fahrenheit ( o F) using the appropriate formulae. [3] o C = K 273 = = (1 mark) 3

4 o F = (1.8 x o C) + 32 (1 mark) = (1.8 x -104) + 32 = ( 1 mark) 4. Do the following calculations and record the answer to the correct number of significant figures or where applicable, to the correct number of decimal places. [2] a. (0.250 / 25.00) x = b = 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 = nm b. Round off g to three significant figures = How many significant figures does each of the following measurements have? [2] a m FOUR b Kg FOUR 7. Determine whether each of the following statements is true or false. If false, correct or state why the statement is false. [10] (a) Bases change litmus paper to blue. True (b) Ammonia is an acid. False it s a base (c) Properties of acids include being corrosive and having a sour taste. True (d) The chemical formula for sulfuric acid is H 2 SO 4. 4

5 True (e) Neutral solutions have a ph of 0. False has ph = 7 8. Complete the following reactions: [4] (a) Zn (s) + 2 HCl (aq) H 2 (g) + ZnCl 2 (2) (b) NaOH (aq) + HCl (aq) NaCl + H 2 O (2) 9. Complete the following sentences: [2] (a) An acid is a proton Donors (1) (b) Water soluble bases are called Alkalis (1) SECTION C: PHYSICS 30 MARKS hold quarks together. (1) A. Gravity B. Electromagnetic force C. Strong nuclear force D. Weak nuclear force 1.2 A unit of force called Newton is equivalent to. (1) A. g.m/s 2 B. kg.ms -1 C. c.ms -2 D. kg.ms Suppose an object of mass 8.9 kg falls from a height of 16 cm to the ground. This object has a weight of. (1) A. 8.9 kg B. 9.8 kg.n C N D J 1.4 The weight of an object is known as. (1) a. The mass of the object in space b. The force of an object due to gravity. c. The gravitational acceleration of the object. 5

6 d. Newton s laws of motion. 1.5 For a force to be observed, two bodies. (1) A. Must be in contact. B. Do not need to be contact. C. Need to have equal forces. D. Must have a uniform velocity. 1.6 The gravitational acceleration for the moon and the earth is. (1) A. The same B. Different C m/s 2 D. 9.8 m/s Suppose a force of 10 N is exerted on a brick and an acceleration of 2.5 m/s/s is observed. What is the mass of the brick? (1) A. 25 kg B. 4 kg C. 10 kg D. 2.5 kg 1.8 An electron and a proton are two particles. (1) A. Nucleons B. Positively charged C. Negatively charged D. Unlike charged 1.9 When an atom undergoes fission process, it is a result of. (1) A. Weak nuclear force B. Strong nuclear force C. Gravitational force D. Electromagnetic force 1.10 According to one Newton s law of motion, mass is. (1) A. A constant of proportionality. B. Directly proportional to acceleration. C. Directly proportional to force applied on a body. D. Changing as a constant force is applied on a body If a force applied on a body doubles, then acceleration. (1) A. Doubles 6

7 B. Triples C. Decreases by a half D. Remains the same 1.12 A contact force acting in the opposite direction when an ink pen is slid on the surface of the book is known as. (1) A. Friction B. Magnetic force C. Applied force D. Tension 1.13 The SI unit for frequency is. (1) A. Kg/s B. m C. m/s D. Hz 1.14 A is a disturbance that transfers energy through a medium from one location to another. (1) A. Force B. Wave C. Wavelength D. Friction 1.15 Type of wave with vibrations perpendicular to the direction of the motion of the wave is known as; (1) A. Longitudinal wave B. Transverse wave C. Both longitudinal and transverse waves D. None of the above 1.16 Which one is a renewable source of energy? (1) A. nuclear energy B. geothermal gas C. natural gas D. coal 1.17 Briefly discuss how electricity is generated from nuclear. (4) Fission of uranium heat water to make steam steam turns turbines electrical power sent around the country. [one mark for each step] A student with a mass of 8200 g stands at the top of a hill of height 0.4 Km (Position A), 7

8 as shown in the diagram below. Note: Answers should be in SI units a. What is the student s gravitational potential energy at the top of the hill? (2) Note: Gravitational acceleration (g) = 9.8 m.s -2 Gravitational potential energy (PE) = mgh (1 mark) 1000) m = (8200 /1000) Kg x 9.8m.s -2 x (0.4 x = Kg.m 2.s -2 = Joules (1 mark) b. Assuming that energy is conserved and there is no friction, what will the student s velocity be at the bottom of the hill (position B)? (3) PE at position A = KE at position B Therefore, KE at position B = J (1 mark) Thus, KE = ½ mv 2 (1 mark) J = ½ (82 Kg)v 2 v = m.s -1 (1 mark) 1.19 How do you understand the weight of an object? (1) 8

9 The weight of an object is force due to gravity State the difference between transverse and longitudinal waves (4) Transverse wave the vibration of particles is perpendicular (form 90 o ) to the direction of a wave. Longitudinal wave the vibrations of particles is parallel to the direction of a wave. 9

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POLYTECHNIC OF NAMIBIA SCHOOL OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES BASIC SCIENCE FULLTIME TEST 2

POLYTECHNIC OF NAMIBIA SCHOOL OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES BASIC SCIENCE FULLTIME TEST 2 INITIALS: SURNAME: STUDENT NUMBER: MODE OF STUDY: QUALIFICATION: LECTURE