Gas W Gas X Gas Y Gas Z Breathed air Unbreathed air Carbon dioxide Oxygen

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1 KIANGSU-CHEKIANG COLLEGE (SHATIN) EASTER HOLIDAYS ASSIGNMENT F.2 INTEGRATED SCIENCE Write ALL the answer in the answer sheet. Section A Multiple Choice (20%) Directions: Questions 1 to 3 refer to the table below. There are 4 bottles each containing different gas: Gas W Gas X Gas Y Gas Z Breathed air Unbreathed air Carbon dioxide Oxygen 1. Which bottle of gas can relight a glowing splint in the shortest time? A. Gas W B. Gas X C. Gas Y D. Gas Z 2. Which bottle of gas should be used to put out a fire? A. Gas W B. Gas X C. Gas Y D. Gas Z 3. If a burning candle is put into each bottle, which bottle s candle will go off in the shortest time? A. Gas W B. Gas X C. Gas Y D. Gas Z 4. We can use to absorb carbon dioxide. A. hydrogencarbonate indicator B. Soda lime C. Alcohol D. Nitrogen 5. These shapes are all made from the same amount of material that conducts electricity. Which shape will have the largest resistance? 1

2 6. Study the following circuit: What happens to the ammeter reading when the switch is closed? A. The ammeter reading will increase. B. The ammeter reading will decrease, but will not become zero. C. The ammeter reading will remain unchanged. D. The ammeter reading will become zero. 7. Burning can produce: (1) light energy heat energy (3) food (4) carbon dioxide A. (1) and only B. and (4) only C. (1),, and (4) only D. (1),, (3) and (4) 8. When a glowing splint is put into a bottle of oxygen, it will: A. relight B. go off C. explode D. give out a black smoke 9. In which of the following circuits will the cell run down more quickly than the others when the switch is closed? 10. What is used to protect an electrical appliance from damage by an excessively high current? A. Rheostat B. Resistor C. Switch D. Fuse 2

3 11. When a goalkeeper catches a football, A. he uses force to stop the ball s motion. B. he uses force to start the ball s motion. C. he uses force to change the direction of the ball s motion. D. he uses force to change the shape of the ball. 12. Which of the following can help a racing car move faster? (1) Add good engine oil to the car s engine. Add some grease to all movable parts of the car. (3) Add ball-bearings to the axles. A. (1) only B. (1) and C. (1) and (3) D. (1), and (3) 13. Which of the following are the properties of hydrogen? (1) colourless odourless (3) can burn in air A. (1)and only B. (1)and (3) only C. and (3) only D. (1), and (3) 14. The surface of a spacesuit is shiny. It is because (1) a shiny surface can reflect heat radiation from space. a shiny surface can reflect ultraviolet radiation from space. (3) a shiny surface can reflect light so that the astronauts can be seen in space from the Earth. A. (1)only B. only C. (1)and only D. (1), and (3) 15. Rockets are usually made up of stages. This is because A. a rocket is too large. B. once the fuel inside a stage is used up, we can detach it so as to reduce the weight of the rocket. C. different stages carry different kinds of fuel. D. astronauts share different stages. 3

4 16. Which of the following diagrams correctly shows the forces acting on a space shuttle during lift off? 17. Which of the following groups contains: an insulator, a conductor, and a very good conductor? A. carbon, rubber band, water B. plastic ruler, ceramic pot, copper wire C. gold ring, carbon, rubber band D. lead, wool, wood 18. Which of these circuits contains a short circuit? 19. The unit of weight is A. newton B. gram C. kilogram D. pound 4

5 20. There is a junction in an electric circuit. If 1 A flows along AB and 5 A along CB, what is the size of the current that will flow along BD? A. 6 A B. 4 A C. 3 A D. 2 A Section B True or False (15%) 1. When we breathe in, the ribs move upwards and the diaphragm contracts. 2. In a parallel circuit, a larger current passes through the branch with a larger resistance. 3. Breathed air contains more oxygen than nitrogen. 4. Ultraviolet radiation is harmful to us. 5. We use the earth wire to prevent excessively large currents from flowing through an appliance. 6. One of the reasons of using hydrogen as rocket fuel is that it is clean. 7. Electrical appliances that make use of the heating effect of current must have a resistance wire inside. 8. We use a voltmeter to measure electric current. 9. A beam balance is used to measure mass 10. Electromagnets can be turned on and off. 11. Since there is no air in space, it is always cold in space. 12. Home appliances are usually connected in series. 13. A rocket can move around the Earth with its engine off. 14. An object has the same mass on the Earth and on the Moon. 15. The life support backpack at the back of the spacesuit only supplies oxygen to the astronaut. Section C Fill in the blanks (20%) 1. As a space shuttle returns to Earth, the air friction will produce a large amount of. 2. The Sun can transfer its heat to us by. 3. There are many free inside a metal. 4. We can control the current in a circuit by using a variable resistor or so called. 5. Greenhouse effect is caused by the increasing concentration of in atmosphere. 6. A variegated leaf has green and non-green parts. The green colour is due to the presence of. 7. We use solution to test for the presence of starch. 8. To measure the voltage across a cell, the red terminal of the voltmeter should be connected to the pole of the cell. 5

6 9. Force can be measured by a. 10. A force can change the of motion of an object. 11. A can help to reduce the speed of a person falling who jump from a high mountain. 12. The space between the Sun and the Earth is a. Therefore heat from the Sun cannot be transferred to us by conduction. 13. A circuit provides an easier route and may cause a dangerously high current. 14. We use an to measure current. It must be connected in series to the circuit under measurement. 15. A motor makes use of the effect of current. 16. Food chains start with. 17. When hydrogen burns in air, is formed. 18. When the space shuttle moves around the Earth, the astronauts inside are in a state of. 19. If too many appliances are connected to one mains socket, occurs. 20. Magnetic force and force of are examples of non-contact force. Section D Drawing (8%) PENCIL should be used to draw the symbol. Column A Circuit component Column B Symbol 1. filament bulb 2. ammeter 3. rheostat 4. cell 5. fix-valued resistor 6. open switch 7. voltmeter 8. fuse 6

7 Section E Matching (7%) Term 1. ultraviolet radiation 2. rocket booster 3. dehydratable food 4. reaction 5. Saturn V 6. lubricant 7. friction Meaning a) an example of force b) it can help reducing friction c) the biggest rocket ever built d) an example of spin-off products from space technology e) it can provide extra pushing force during lift off f) the opposite of action g) it can be used to kill bacteria Section F Extension Questions (30%) 1. The diagram below shows the structure of an electric bell. M a) Name M. (1%) b) Rewrite these sentences into the correct order to show what happens in an electric bell. (3%) M is magnetized the circuit breaks the hammer springs back a person presses the switch the hammer is attracted to the M the circuit is completed c) Suggest two methods to increase the strength of the electromagnet. (2%) 7

8 2. There is hot water inside a container Z. X Y Hot water a) Name the container Z. (1%) b) Label X and Y. (2%) c) How can X help to prevent heat loss of hot water? (2%) d) How can Y help to prevent heat loss of hot water? (2%) 3. a) What is the function of soda lime in the experiment? (2%) b) Does the position of the coloured liquid index change after one minute? Why? (3%) c) You are advised against holding the boiling tube with your hand. Why? (2%) d) Draw the control experiment in the space provided in the answer sheet. (2%) 4. Racing cars, e.g. the formula 1, are very stream-lined. (a) Why are racing cars designed to be stream-lined?(2%) (b) Give one more example which is with the same design. (1%) (c) Satellites orbit the Earth at a high speed (about 7500 m/s). Why are the satellites not stream-lined? (2%) 5. List three daily life examples in which friction is useful. (3%) The End of the papers 8

9 KIANGSU-CHEKIANG COLLEGE (SHATIN) EASTER HOLIDAYS ASSIGNMENT F.2 INTEGRATED SCIENCE INDEX NO.: TOTAL MARKS: 100 Answer sheet Section A Multiple Choice (20%) 1.D 2.C 3.C 4.B 5.A 6.A 7.C 8.A 9.B 10.D 11.A 12.D 13.D 14.C 15.B 16.A 17.B 18.D 19.A 20.A Section B True or False (15%) 1.F 2.F 3.F 4.T 5.T 6.T 7.T 8.F 9.T 10.T 11.F 12.F 13.T 14.T 15.F Section C Fill in the blanks (20%) 1.heat 2. radiation 3.electrons 4.rheostat 5.carbon dioxide 6. chlorophyll 7. iodine 8. positive 9. spring balance 10. direction 11. parachute 12. vacuum 13. short 14. ammeter 15. magnetic 16. plants 17. water 18. weightlessness 19. overloading 20. gravity Section D Drawing (8%) PENCIL should be used to draw the symbol. Column A Circuit component Column B Symbol 1. filament bulb 2. ammeter 3. rheostat 4. cell 5. fix-valued resistor 6. open switch 9

10 7. voltmeter 8. fuse Section E Matching (7%) 1. g 2. e 3. d 4. f 5. c 6. b 7. a Section F Extension Questions (30%) 1.a) M-electromagnet (1) b) A person presses the switch, the circuit is completed. M is magnetized, the hammer is attracted to the M, the circuit breaks, the hammer springs back. c) Increase the number of cells/increase the size of current, Round more turns of coil (3) 2.a) Z-vacuum flask b) X- vacuum Y- silvered-glass wall c) Prevent conduction (1) d) Prevent radiation 3.a) Absorb carbon dioxide b)yes, it is because grasshopper breathes in oxygen and gives out carbon dioxide. Carbon dioxide is then absorbed by soda lime and hence air pressure decreases inside the boiling tube. (3) c) It is because heat from the hand will cause the air inside the boiling tube expands and affects the result. d) 10

11 4.a) It can reduce air friction. b) ship c) There is no air in the space. (1) 5. Gloves of the goalkeeper. Nail on the wall. Grooves on the car tyres. (Any acceptable Answers) (3) The End of the Answer Sheet 11