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

Transcription

1 POLYTECHNIC OF NAMIBIA SCHOOL OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES BASIC SCIENCE PARTTIME TEST 2 INITIALS: SURNAME: STUDENT NUMBER: MODE OF STUDY: QUALIFICATION: LECTURE VENUE: COURSE NAME: COURSE CODE: BASIC SCIENCE BSC410S DATE: 1 OCTOBER 2015 DURATION: 1H15 MARKS: /60 THIS QUESTION PAPER CONSISTS OF 6 PAGES INCLUDING THIS FRONT COVER INSTRUCTIONS 1. Answer all questions on question paper. 2. Please write neatly and legibly 3. No books, notes and other additional aids are allowed. 4. Only a scientific calculator is allowed Page 1 of 6

2 SECTION A: BIOLOGY [20 MARKS] QUESTION 1 [10 MARKS] Question Type: Multiple Choices. Each answer equals 2 marks. 1. Micronutrients are dietary components, often referred to as. (2) A. monosaccharide and disaccharide B. carbohydrates and proteins C. carbohydrates and lipids D. vitamins and minerals 2. Which elements make up a protein? (2) A. hydrogen, calcium, oxygen and carbon B. carbon, hydrogen, oxygen and glycerol C. hydrogen, oxygen, carbon and potassium D. hydrogen, carbon, oxygen and nitrogen 3. Which of the following is the critical function of proteins? (2) A. repair of damaged cells B. manufacture of antibodies C. growth of new cells D. production of energy 4. 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: (2) A. acts as a solvent for nutrients B. helps regulate the body temperature C. clots the blood D. participates in chemical reactions 5. Malnutrition is a condition that results from taking an unbalanced diet in which certain nutrients are: (2) A. in excess B. lacking C. in wrong proportions D. all of the above Page 2 of 6

3 QUESTION 2 [10 MARKS] Question Type: Complete the Table (i iii) Nutrient Main Function Deficiency disease/signs (i) Keeps gums and muscles in good shape Scurvy / Bleeding gums / pain in joints Food source (ii) (iii) Carries oxygen round body Anaemia (iv) Vitamin K Clot master (v) Leafy green vegetables, diary products SECTION B: CHEMISTRY [20 MARKS] 1. The two physical quantities that define any sample of matter are; [2] (a) Weight and volume (b) Mass and Weight (c) Mass and Volume (d) Volume and Area 2. Sublimation is the transformation of a state of matter from a; [2] (a) Solid to a liquid (b) Liquid to gas (c) Solid to gas (d) Gas to solid 3. An appropriate physical method that can be used to separate two liquids with different boiling points is; [2] (a) Chromatography (b) Simple distillation (c) Separating funnel (d) Fractional distillation 4. Which of the following transformation is a suitable example of a chemical change? [2] (a) Melting steel (b) A plant growing (c) Chopping wood (d) None of the above Page 3 of 6

4 5. is an example of an intensive physical property. [2] (a) Density (b) Mass (c) Volume (d) All of the above 6. Which of the following samples of matter is NOT classified as a compound? [2] (a) Blood (b) Water (c) Salt (d) Sugar 7. Which of the following is NOT a characteristic of a mixture; [2] (a) No definite composition (b) Cannot be separated physical and chemically (c) Retain the original properties (d) None of the above 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. [2] (a) Endothermic and increase (b) Exothermic and increase (c) Endothermic and decrease (d) Exothermic and decrease 9. In terms of the Kinetic Theory of Atoms, the intermolecular force between atoms when a solid is transformed into a liquid. [2] (a) Increase (b) Decrease (c) Remain the same (d) Equals zero 10. How does the presence of an impurity affect the freezing point and boiling point of water? [2] (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 Page 4 of 6

5 SECTION B: PHYSICS [20 MARKS] 1. Ionising radiation is produced by the following particles or waves except. (2) A. Alpha radiation B. Beta radiation C. Gamma radiation D. X rays 2. Nuclei having the same number but different atomic number are (2) A. isotopes B. isobars C. Isotones D. Isomers 3. The following nuclear equation shows a nuclide undergoing beta decay. What is the new nuclide formed indicated by the letter X: (2) A. Carbon B. Nitrogen C. helium atom D. Sulphur 14 6 C 14 7X + 0-1e 4. Which of the following statements is true? (2) 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. 5. When a radionuclide undergo alpha decay, its mass number decreases by And atomic decreases by (2) A. 2 and 4 B. 3 and 4 C. 4 and 2 D. 1 and 0 6. Which of the following will be attracted towards the positive plate? (2) A. alpha particles B. beta particles C. gamma rays D. neutrons 7. A radionuclide has a half-life of 35 days. What is the fraction of radionuclide remaining after 105 days? (2) Page 5 of 6

6 A. 50% B. 25 % C. 12.5% D. 75% 8. undergoes alpha decay, What will be the products of this reaction? (2) A. and B. and C. and D. None of the above 9. Which of the following radionuclides can be used as a radiotracer in Agriculture. (2) A. Iodine 131 B. Sodium 22 C. Phosphorus 32 D. Krypton gas 10. Cobalt 60 is used as a sterilant in the food industries because it (2) A. kills all microorganism B. improves the taste of food C. cannot trans mutate to another nuclide D. has a short half-life and kills all the microbes without irradiating the food. END TOTAL: 60 MARKS Page 6 of 6