POLYTECHNIC OF NAMIBIA SCHOOL OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES

Transcription

1 POLYTECHNIC OF NAMIBIA SCHOOL OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES NQF LEVEL: LEVEL 4 COURSE NAME: COURSE CODE: BASIC SCIENCE BSC410S DATE: JANUARY 2016 DURATION: 3 HOURS MARKS: ND OPPORTUNITY EXAMINATION QUESTION PAPER EXAMINER(S): MODERATOR: Dr. Martha Uumati, Dr. Marius Mutorwa and Mr. Vaino Indongo 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 13 pages including this cover and the Periodic Table Page 1 of 13

2 SECTION A: BIOLOGY QUESTION 1 [10] Question Type: Multiple Choices. Each answer equals 1 mark. 1.1 Who of the following scientists developed the 7 level classification scheme? (1) A. Aristotle B. Linnaeus C. Whittaker D. Darwin 1.2 Which of the following is a correct sequence of levels of classification? (1) A. Genus species family order class phylum kingdom B. Species genus family order class phylum kingdom C. Genus species order phylum family class kingdom D. Genus species order family class phylum kingdom 1.3 The science of describing, naming and classifying organisms is. (1) A. Hierarchal Naming System B. Classification C. Taxonomy D. Dewey Decimal 1.4 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? (1) A. Growth and reproduction B. Cellular organization and use of energy C. Reproduction and response to environment D. Use of energy and development 1.5 Pyramids of biomass show. (1) A. the relative amount of living organic matter at each trophic level B. the relative amount of energy available at each trophic level C. the relative number of individual organism at each trophic level in an ecosystem D. None of the above 1.6 Which of the following statements best describes the gymnosperms? (1) A. They are lower plants with seeds that are totally exposed and borne on the scales of cones. B. They are higher plants with seeds that are totally exposed and their seeds are enclosed in the ovary. C. They are basically vascular plants D. They can produce fruits from their flowers. Page 2 of 13

3 1.7 The three macronutrients are. (1) A. monosaccharide, polysaccharide, disaccharide B. fibre, vitamins, proteins C. lipids, carbohydrates, proteins D. carbohydrates, lipids, glycerol 1.8 What elements make up a lipid? (1) A. hydrogen, calcium, oxygen B. glycerol, fatty acids C. hydrogen, oxygen, carbon D. calcium, potassium, oxygen 1.9 Where is keratin proteins found in your body? (1) A. Insulin B. In blood plasma C. In connective tissue D. Hair 1.10 When sucrose is hydrolysed, it yields. (1) A. Glucose & glucose B. Glucose & fructose C. Glucose & galactose D. All of the above 1.11 What gives yoghurt a sour taste? (1) A. Sour milk B. Lactic acid C. Fermented fruits D. Complete fermentation 1.12 Viruses are exceptions to the cell theory, but they have some characteristics of living things. What is one of these characteristics? (1) A. They are made up of many specialized cells. B. They contain genetic material. C. They reproduce by mitosis. D. They contain chlorophyll Which of the following is the critical function of proteins? (1) A. repair of damaged cells B. manufacture of antibodies C. growth of new cells D. production of energy Page 3 of 13

4 1.14 Which of these food types is the main dietary cause of high cholesterol in the blood? (1) A. Protein B. Saturated fat C. Monounsaturated fat D. All of the above 1.15 A closely related family may be grouped together in a single. (1) A. Domain B. Phylum C. Species D. family 1.16 The proper term for "cold-blooded" animals is. (1) A. Mesotherms B. Exotherms C. Ectotherms D. Endotherms 1.17 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 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. Clots the blood C. Helps regulate the body temperature D. Participates in chemical reactions 1.19 Fibre cannot actually be digested. However, it is an important part of our diet for various reasons. One of the following reasons is false, identify which. (1) A. It causes constipation. B. As it remains undigested it passes through the entire gut from mouth to anus and thus keeps food moving smoothly through our system. C. High fibre diets are believed to reduce the risk of heart disease, bowel cancer and cholesterol in the body. D. The fibre absorbs poisonous waste from the digested food. Page 4 of 13

5 1.20 A starter culture in the food industry is. (1) A. fungi that are used to make food rot so that we can eat the food B. a microorganism that is used to control the growth of other organisms C. a microorganism that can withstand high temperatures and can be used in fermentation industries D. bacteria that are used in the fermentation of food products QUESTION 2 [20] Question Type: Brief statement responses 2.1 List the six kingdoms of organisms. (3) 2.2 What are biotic and abiotic factors? Give at least two examples of each. (3) 2.3 What are the processes that autotrophs use to produce organic material from inorganic substances? (2) 2.4 Distinguish between detritivores and saprotrophs, and provide a suitable example of each. (2) 2.5 Define the term competition and use examples to illustrate the two types of competition. (3) 2.6 Carbohydrates are classified into simple and complex carbohydrates. what are the three types of carbohydrates? Give an example of each. (3) 2.7 How is sweet wine produced? (2) 2.8 Give two reasons why as a parent you would encourage the school canteens to sell unsweetened cereals rather than sweets. (2) SECTION B: CHEMISTRY QUESTION 3 [20] Question Type: Multiple Choices. Each answer equals 1 mark. 3.1 Carbon dioxide is an example of a sample of matter classified as a/n; (1) A. compound B. homogeneous mixture C. heterogeneous mixture D. element 3.2 A process which involves the input of energy or absorption of heat is called; (1) A. exothermic B. dissolving Page 5 of 13

6 C. endothermic D. thermodynamic 3.3 Sublimation is the transformation of a; (1) A. gas into a solid B. solid into gas C. gas into liquid D. liquid into gas 3.4 An appropriate physical method that can be used to separate an insoluble solid from a liquid is; (1) A. Chromatography B. separating funnel C. fractional distillation D. filtration 3.5 Which of the following is a characteristic of a mixture; (1) A. no define composition B. consists of two or more substances C. retains original properties D. All of the above 3.6 How does the presence of an impurity affect the freezing point and boiling point of water? (1) 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 3.7 Which of the following samples of matter is NOT classified as a compound? (1) A. blood B. water C. salt D. glucose 3.8 The amount of space an object occupies is known as its. (1) A. density B. volume C. mass D. time 3.9 The ability of a measurement to be consistently reproduced is referred to as. (1) Page 6 of 13

7 A. accuracy B. qualitative C. quantitative D. precision 3.10 The amount of gravitational force on an object is known as its. (1) A. mass B. mole C. weight D. area 3.11 What is the density of a 61.8 g cube that is 2.3 cm wide, 4.0 cm tall, and 3.2 cm long? (1) A. 6.5 g/cm 3 B. 2.1 g/cm 3 C g/cm 3 D. None of the above 3.12 Which of the following measurements has the greatest number of significant figures? (1) A ml B ml C ml D x 10 9 ml 3.13 If the temperature of a freezer is equal to o F, what would the temperature of a freezer be in o C? (1) A o C B o C C o C D. None of the above 3.14 a cyclist travels a distance of 0.5 Km in a time of 0.5 hours. The speed of the cyclist in SI units is equal to. (1) A m/s B. 0.3 m/s 2 C. 1 Km/h D. None of the above 3.15 The identity of an 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 Page 7 of 13

8 3.16 In terms of the periodic trend, the size of an atom as you go down a particular group or column on the Periodic Table. (1) A. Decreases B. Increases C. Remains the same D. It depends on which group 3.17 Elements with the same number of protons but different number of neutrons are referred to as; (1) A. Ions B. Neutral C. Isotopes D. All of the above 3.18 In terms of bonding, elements found in group 5 tend to; (1) A. Lose five electrons B. Lose three electrons C. Gain three electrons D. Gain five electrons 3.19 are the most reactive metals on the Periodic Table. (1) A. Transition metals B. Alkali earth metals C. Lanthanide metals D. Alkali metals E. Actinide metals 3.20 The mixture of two or more metals is known as; (1) A. Ore B. Alloy C. Metalloid D. Mineral QUESTION 4 [10] Question Type: Brief statement responses 4.1 Define the following terms. (4) a. acid b. salt c. indicator d. base 4.2 List two physical properties of acids. (2) Page 8 of 13

9 4.3 In agriculture, it is important to monitor the ph of the soil to ensure the growth of crops. Discuss how you would treat soil that is: (2) a. Too acidic b. Too basic 4.4 Fill in the products formed in the following reactions: (2) a. Mg + 2HNO 3 b. H 2 SO 4 + CaCO 3 SECTION C: PHYSICS QUESTION 5 [6] Question Type: Multiple Choices. Each answer equals 1 mark. 5.1 A police man sends out radar waves with a 3.4 cm wavelength from his police car with a speed of 3 x 10 8 m/s. What is their frequency? (1) A x 10 9 Hz B x 10 9 Hz C x 10 9 Hz D x 10 6 Hz 5.2 An apple of mass 23 g fall from a tree at 5 m height. What is the potential energy of an apple? (1) A. 3 Joules B. 2 joules C Joules D Joules Use the following table and graph to answer questions The height (in cm) for 30 students in a Physics class was determined as follows: Height in cm Frequency Page 9 of 13

10 5.3 The graph drawn is known as (1) A. Pie chart B. Line graph C. Bar graph D. Histogram 5.4 How many students have heights between ? (1) A. 4 B. 5 C. 6 D How many students have heights more than 169.5? (1) A. 10 B. 8 C. 5 D What percentage of students have heights between ? (1) A. 17% B. 30% C. 22%12% 5.7 Nuclei having the same mass number but different atomic number are (1) A. isotopes B. isobars C. Isotones D. Isomers Page 10 of 13

11 5.8 The following nuclear equation shows a nuclide undergoing beta decay. What is the new nuclide formed indicated by the letter X: (1) A. Carbon B. Nitrogen C. helium atom D. Sulphur 14 6 C 14 7X + 0-1e 5.9 Which of the following statements is true? (1) A. the mass of a neutron and an beta particles are the same B. an electron is found in the nucleus of the atom C. a beta particle originate in the nucleus of the atom D. neutrons and x rays are basically the same in origin When a radionuclide undergo alpha decay, its mass number decreases by and atomic decreases by. (1) A. 2 and 4 B. 3 and 4 C. 4 and 2 D. 1 and 0 QUESTION 6 [8] Question Type: Brief statement responses. 6.1 If you were employed by the Directorate of Atomic Energy as a Radiation Scientist, list two advantages and one disadvantage you would offer with respect to the use of nuclear energy. (3) 6.2 Briefly explain how is produced from coal (4) 6.3 State the Law of Conservation of Energy state. (1) QUESTION 7 [4] Question Type: Brief statement responses 7.1 State Ohm s Law (2) 7.2 State the difference between conventional and direct current. (2) QUESTION 8 [5] Question Type: Brief statement responses. 8.1 Define the term inertia. (2) Page 11 of 13

12 8.2 List three effects that a force when applied can have on an object moving at a constant velocity. (3) QUESTION 9 [3] Question Type: Brief statement responses. 9.1 Define the following characteristics of a wave: (3) a. Wavelength b. Amplitude c. Trough THE END TOTAL: 100 MARKS Page 12 of 13

13 Page 13 of 13