St. Joseph s Anglo-Chinese School First Term Examination F.2 Integrated Science

Transcription

1 St. Joseph s Anglo-Chinese School First Term Examination F.2 Integrated Science Name : Total Pages : 10 pages Class : Class No.: Total Marks : 100 marks Date : 9 th January, 2015 Time Allowed : 1 hr 15 mins INSTRUCTIONS: 1. After the announcement of the start of the examination, you should first write your Name, Class and Class No. in the spaces provided. 2. Write your answers in the spaces provided in the Answer Sheet. 3. This paper consists of FOUR sections. Sections A, B, C and D. Attempt ALL questions. 4. The diagrams in this paper are NOT necessarily drawn to scale. INSTRUCTIONS (MULTIPLE-CHOICE QUESTIONS): 1. All questions carry equal marks. 2. Answer ALL questions. You are advised to use an HB pencil to mark all the answers on the Answer Sheet, so that wrong marks can be completely erased with a clean rubber. You must mark the answers clearly; otherwise you will lose marks if the answers cannot be captured. 3. You should mark only ONE answer for each question. If you mark more than one answer, you will receive NO MARKS for that question. 4. No marks will be deducted for wrong answers First Term Examination/ F.2 Integrated Science / Question Paper / LAM 1 / 10

2 Section A : True and False Questions (10 marks, 1 mark each) 1. Cobalt chloride paper is pink when it is dry. 2. Carbon dioxide, water and chlorophyll are raw materials to make starch and oxygen in photosynthesis. 3. Humans depend directly or indirectly on plants for food. 4. Respiration of humans takes place in air sacs. 5. Green plants carry out respiration day and night. 6. The tar in cigarette smoke causes addiction to smoking. 7. Respiration is the process in which oxygen gets into the body and carbon dioxide is removed from the body. 8. Free electrons are the electrons moving around the nucleus in an atom. 9. The voltage of a cell is a measure of how much energy is supplied by the cell to the free electrons in a circuit. 10. All non-metals are electrical insulators. Section B : Fill in the blanks (25 marks, 1 mark each) 1. Carbon dioxide turns lime water (a). 2. Nitrogen is fairly (b) and there is no simple test for it. 3. (c) is often used to fill commercial lights. 4. Burning is a chemical reaction between a (d) and oxygen. 5. What safety guidelines have to be done to prevent fire accidents at home? * Do not (e) the sockets * Make sure all gas and (f) appliances are switched off before you leave the flat. 6. The light energy is absorbed by a green pigment called chlorophyll inside the (g) in green plant cells. 7. Animals exchange oxygen and carbon dioxide with the surroundings continuously is known as (h). 8. The word equation below summarizes the process of respiration : food + oxygen carbon dioxide + (i) + (j) 9. The human (k) system is used for gaseous exchange. 10. Air passes in the human body by the following order : Nostrils nasal cavity trachea (l) bronchioles (m) 11. The (n) are protected by the rib cage which consists of the ribs, the (o) and the chest bone. 12. When the air we breathe in reaches the air sacs, (p) in the air passes into the (q). It is then carried to all body cells by the flow of blood around the body First Term Examination/ F.2 Integrated Science / Question Paper / LAM 2 / 10

3 13. Non-smokers may also breathe in the smoke given out from other people s cigarettes which is known as (r) smoking. 14. The cell, the bulb and the wires are connected to form an electric (s). 15. A (t) circuit forms a complete path for current to flow. 16. Materials that do not conduct current are electrical (u). 17. An atom consists of a (v) and one or more electrons moving around it. 18. The net flow of free electrons forms the (w). 19. An (x) is a device for measuring the size of a current. 20. A (y) is a device for measuring the size of voltage. Section C : Multiple Choice Questions (20 marks, 1 mark each) 1. Which of the following objects can be used to test for nitrogen? (1) Glowing splints (2) Hydrogencarbonate indicator (3) Lime water A. (1) only B. (2) only C. (3) only D. None of them 2. When a burning splint is put into an unknown gas, it goes out. The gas may be (1) carbon dioxide. (2) nitrogen. (3) oxygen. A. (1) only B. (2) only C. (1) and (2) only D. (2) and (3) only 3. What happens when a piece of dry cobalt chloride paper is exposed to water? A. It changes from blue to yellow. B. It changes from blue to pink. C. It turns milky. D. No colour change is observed First Term Examination/ F.2 Integrated Science / Question Paper / LAM 3 / 10

4 4. Gas X cannot relight a glowing splint and cannot turn lime water milky. What is gas X? A. Oxygen B. Carbon dioxide C. Water vapour D. Cannot be determined 5. Which of the following comparisons between breathed air and fresh air is correct? Breathed air Fresh air A. Amount of carbon dioxide Less More B. Amount of oxygen More Less C. Temperature Higher Lower D. Amount of water vapour Less More 6. The pictures below show four identical burning candles. Each is covered by a glass container of a different size. Which candle flame will be the first to go out? A B C D Directions: Questions 7 and 8 refer to the experiment below. 7. What can be observed at the end of the experiment? (1) Some liquid is formed on the inner surface of the gas jar. (2) The hydrogencarbonate indicator turns yellow. (3) The gas jar becomes warm. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) First Term Examination/ F.2 Integrated Science / Question Paper / LAM 4 / 10

5 8. What can be concluded from the observations in Question 7? (1) Water is formed from burning food. (2) Carbon dioxide is formed from burning food. (3) Burning gives out heat energy. A. (1) only B. (1) and (2) only C. (2) and (3) only D. (1) and (3) only 9. We can make a fire burn more brightly by fanning during a barbecue because A. fanning increases the supply of the fuel to the fire. B. fanning lowers the temperature of the fire. C. fanning removes the ash from the charcoal. D. fanning increases the supply of oxygen to the fire. 10. Which of the following statements about burning are correct? (1) Burning is a chemical reaction between a fuel and oxygen. (2) Chemical energy stored in the fuel is changed to heat energy and light energy during burning. (3) Water is produced during burning. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) First Term Examination/ F.2 Integrated Science / Question Paper / LAM 5 / 10

6 11. A paper cup half-filled with water is heated over a candle flame. The paper cup does not catch fire. Which of the following best explains the phenomenon? A. The water brings the heat away so that the cup does not get hot enough to start burning. B. The water blocks the oxygen from the cup. C. The water does not support burning. D. There is not enough fuel. 12. Which food has the highest energy content per gram? A. Wheat bread B. Cheese C. Ham D. Lettuce 13. Consider the food chain below. grass cow lion Which of the following about the food chain above is INCORRECT? A. The grass is eaten by the cow. B. The Sun is the producer. C. The cow is the consumer. D. The lion is the consumer. 14. The diagram on the right shows a set-up used to study the product of photosynthesis of green water plants. What can be observed if the set-up is left under light for 24 hours? (1) Some air bubbles are formed on the leaves. (2) Some gas is collected in the test tube. (3) The leaves become pale yellow in colour. A. (1) only B. (1) and (2) only C. (2) and (3) only D. (1), (2) and (3) water water green water plant First Term Examination/ F.2 Integrated Science / Question Paper / LAM 6 / 10

7 15. Oxygen is a by-product of A. photosynthesis carried out by green plants. B. respiration carried out by green plants. C. respiration carried out by animals. D. photosynthesis carried out by animals. 16. Which of the following statements about respiration and photosynthesis is/are correct? (1) Both processes need oxygen. (2) Energy is changed from one form to another in both processes. (3) Water is formed in both processes. A. (2) only B. (3) only C. (1) and (3) only D. (2) and (3) only 17. If the Air Pollution Index goes up beyond 100, people with heart or respiratory diseases should A. avoid physical activities. B. wear oxygen mask. C. consult a doctor at once. D. go to the countryside. 18. Which of the following is an electrical conductor? A. Rubber B. Wool thread C. Iron nail D. Wooden board 19. In which of the following circuits will the bulb light up when the switch is closed? A. B. C. D First Term Examination/ F.2 Integrated Science / Question Paper / LAM 7 / 10

8 20. Which of the following statements about a cell in a closed circuit is correct? A. The cell causes a net flow of free electrons in the circuit. B. The cell supplies free electrons to the circuit. C. The cell supplies positive charges to the circuit. D. The cell drives the free electrons to flow in one direction in the circuit. Section D : Conventional Questions (45 marks) 1. The following experiment studies the conditions necessary for photosynthesis. The green plant below has been put in the dark for two days before the experiment. Leaf Y is covered with a piece of black paper and leaf Z is contained in a sealed flask with a small amount of soda lime. After leaving the plant under the sun for a few hours, leaves X, Y and Z are removed for starch test. leaf X leaf Z leaf Y covered with a black paper soda lime (a) The plant has been put in the dark for two days before the experiment. Why? (b) Using the letter listed above, which of the above leaf/leaves is/are used to study (i) light is necessary for photosynthesis? (ii) carbon dioxide is necessary for photosynthesis? (c) (i) Leaves X, Y and Z are heated in boiling water before they are tested for starch. What is the purpose of doing so? (ii) What else should be done to the leaves before they are tested for starch? Explain briefly. (d) Suggest ONE chemical that can be used to test for starch. (e) State the result of the test on leaves X, Y and Z. (3 marks) (f) What is present in leaves X, Y and Z? Explain briefly. (g) What conclusion(s) can you draw from the result in (f)? First Term Examination/ F.2 Integrated Science / Question Paper / LAM 8 / 10

9 Carbon dioxide concentration (arbitrary unit) 2 The set-up below is used to study gaseous exchange in a green leaf. Each tube contains 3 cm 3 of hydrogencarbonate indicator. Tubes C and D are wrapped with aluminium foil. The set-up is left under bright light for one hour. aluminium foil A B C D hydrogencarbonate indicator 2. (a) Complete the table to show the colour changes of the hydrogencarbonate indicator in the test tubes after one hour. Tube A B C D Colour change of the indicator No change No change (b) Explain the colour changes of the indicator in tube A and tube C. (3 marks) (c) State the purposes of setting up tube B and tube D. (d) Without adding or removing anything from the set-up, how can we shorten the time of the experiment? 3. The graph below shows the changes in the carbon dioxide concentration in the atmosphere from 1960 to Year First Term Examination/ F.2 Integrated Science / Question Paper / LAM 9 / 10

10 3. (a) Describe the changes in carbon dioxide concentration in the atmosphere shown by the graph. (b) State TWO human activities that may be responsible for the rise in the carbon dioxide concentration in the atmosphere. (c) What can we do to help reduce the concentration of carbon dioxide in the atmosphere in our daily life? Suggest TWO ways. (d) Besides carbon dioxide, (i) list TWO other air pollutants. (ii) states THREE possible sources of air pollutants. (3 marks) (iii) State the health effects of the air pollutants mentioned in (d)(i). 4. Consider the water flow model and the electric circuit below. water pump water current water pipe fan (a) What are the counterparts of different parts of the circuit in the water flow model? (4 marks) Parts in the water flow model pump water flow fan water pipe Parts in an electric circuit (b) State ONE similarity between the water flow model and the electric circuit. (c) State ONE limitation of the water flow model on explaining an electric circuit. (d) In the circuit above, what is the direction of the net flow of free electrons? (e) An ammeter can be used to measure the current passing through a circuit. If a device analogous to the ammeter is added to the water flow model, what does the device measure? END OF QUESTION PAPER First Term Examination/ F.2 Integrated Science / Question Paper / LAM 10 / 10

11 St. Joseph s Anglo-Chinese School First Term Examination F.2 Integrated Science Suggested Solution Section A 1. F 2. F 3. T 4. F 5. T 6. F 7. F 8. F 9. T 10. F True and False Questions (10 marks, 1 mark each) Section B Fill in the blanks (25 marks, 1 mark each) (a) milky (b) unreactive (c) Neon (d) fuel (e) overload (f) electrical (g) chloroplasts (h) gaseous (i) energy (j) water exchange (k) respiratory (l) bronchi (m) air sacs (n) lungs (o) backbone (p) oxygen (q) capillaries (r) passive (s) circuit (t) closed (u) insulators (v) nucleus (w) current (x) ammeter (y) voltmeter Section C. Multiple Choice Questions (20 marks, 1 mark each) 1. D 2. C 3. B 4. D 5. C 6. C 7. D 8. C 9. D 10. D 11. A 12. B 13. B 14. B 15. A 16. A 17. A 18. C 19. B 20. A Section D. Conventional Questions (45 marks) 1. (a) During this period, any starch stored in the leaves will be used and no starch will be present at the start of the experiment. (b) (i) X and Y (ii) X and Z (c) (i) To destroy the cell membranes of the leaf cells. (ii) The leaves should be soaked in hot alcohol to remove the chlorophyll (d) Iodine solution First Term Examination/ F.2 Integrated Science / Question Paper / LAM 11 / 10

12 (e) Iodine solution turns blue-black on leaf X while it remains brown on leaves Y and Z (f) Starch is present in leaf/leaves X and absent in leaf/leaves Y and Z. Only leaf/leaves X has/have carried out photosynthesis. (g) We can conclude that light and carbon dioxide is/are necessary for photosynthesis. 2. (a) Tube A: The indicator changes from red to purple. Tube C: The indicator changes from red to yellow. (b) In tube A, there is a net uptake of carbon dioxide by the leaf because the rate of photosynthesis is higher than that of respiration under bright light. In tube C, the leaf carries out respiration in the dark and gives out carbon dioxide. (c) Tube B: To make sure that the result in tube A is caused by the presence of the leaf. Tube D: To make sure that the result in tube C is caused by the presence of the leaf. (d) Increase the wattage of the lamp / shorten the distance between the lamp and the test tube 3. (a) The carbon dioxide concentration in the atmosphere is generally rising / rising with fluctuations from 1960 to (b) Burning fossil fuels. Removing forests. (Accept other reasonable answers.) (c) Use electrical appliances that save energy (e.g. those carrying grade 1 energy label). Take public transport instead of private cars. (d) (i) nitrogen oxides / sulphur dioxide / carbon monoxide / ozone / suspended particulates (Any two) (ii) burning fossil fuels in power stations, factories and motor cars (3 marks) (iii) Sulphur dioxide and nitrogen oxides are irritate our eyes and throat. carbon particles, sulphur dioxide and nitrogen oxides can irritate our lungs. (Any possible answer) 4. (a) (4 marks) Parts in the water flow model pump water flow fan water pipe Parts in an electric circuit battery current bulb wire (b) Energy is transferred from one device to another. (Accept other reasonable answers.) (c) In the electric circuit, electric energy is converted into light energy and heat energy but the water flow model involves kinetic energy only (Accept other reasonable answers.) (d) From the negative terminal to the positive terminal through the bulb. / Clockwise (e) The flow rate of water First Term Examination/ F.2 Integrated Science / Question Paper / LAM 12 / 10

13 F.2 Integrated Science 14/15 1st Term Examination Revision on vocabulary Section 7.1 oxygen noble gases unreactive water vapour glowing splint hydrogencarbonate indicator lime water cobalt chloride paper Section 7.2 fuel oxygen high temperature burning fire triangle uncontrolled fire safety precautions overload electrical appliances flammable Section 7.4 carbon dioxide water chemical energy chloroplasts starch oxygen control experiment consumer destarching photosynthesis gaseous exchange Section 7.5 respiration gaseous exchange nasal cavity trachea bronchus bronchiole air sac rib lung diaphragm nostrils rib cage backbone capillaries Section 7.6 power stations factories motor cars air pollutants sulphur dioxide, SO 2 nitrogen oxides, NO x carbon monoxide, CO ozone, O 3 suspended particulates Nicotine Hydrogen cyanide Tar passive smoking Section 8.1 & 8.2 electric current electric circuit closed circuit open circuit electrical energy light energy heat energy electrical conductors electrical insulators switch conduct Section 8.3 nucleus electrons free electrons current ammeter ampere (A) voltage voltmeter volt (V) First Term Examination/ F.2 Integrated Science / Question Paper / LAM 13 / 10