DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION Department of Curriculum Management Educational Assessment Unit Track 2 Annual Examinations 2017 YEAR 10 PHYSICS TIME: 2 hours Name: Class: INFORMATION FOR CANDIDATES Where necessary take acceleration due to gravity g to be 10 m/s 2. The use of a calculator is allowed. The number of marks for each question is given in brackets at the end of each question. You may find these equations useful. Force F = m a W = m g Motion Electricity Waves total distance (u + v) t Average Speed = total time s = s = ut + 1 2 2 at2 v = u + at v 2 = u 2 + 2as Momentum = m v Q = I t V = I R E = Q V R L/A R TOTAL = R 1 + R 2 + R 3 real depth η = apparent depth v = f λ f = 1 T E = I V t 1 = 1 + 1 R TOTAL R 1 R 2 speed of light in air η = speed of light in medium magnification = h i image height = h o object height Others Area of triangle = 1 2 bh Area of Trapezium = 1 (a + b)h 2 INSTRUCTIONS TO CANDIDATES Use blue or black ink. Pencil should be used for diagrams only. Read each question carefully and make sure that you know what you have to do before starting your answer. Answer ALL questions. All working must be shown. This document consists of 12 printed pages. For Examiner s Use Only Question Max Mark 1 8 2 8 3 8 4 8 5 8 6 15 7 15 8 15 Written 85 Practical 15 Total 100 Physics Year 10 Track 2 2017 Page 1 of 12
SECTION A Each question carries 8 marks. This section carries 40 marks of the total marks for this paper. 1. Orcas and dolphins can hear and produce very high frequency sounds. They use such sounds in their navigational system to orient and capture prey. Orcas produce a wide variety of clicks, whistles and pulsed calls. These vary in frequency from 1 khz to 25 khz. Figure 1 a) 25 khz sounds are inaudible. What are these high frequency sounds called? [1] b) In the space provided, draw a sound wave and mark one wavelength. [2] c) A dolphin sends a sound signal and receives an echo from a shoal of fish in 1.5 seconds. If the speed of sound in seawater is 1550 m/s, calculate the distance travelled by these waves. d) Calculate the distance from the dolphin to the shoal of fish. [1] e) The wavelength of the sound waves is 0.07 m, calculate the frequency of the sounds emitted by these dolphins. Page 2 of 12 Physics Year 10 Track 2 2017
2. Steve is playing a football match. A glass window of a nearby building reflects sunlight into his eyes. Figure 2 a) On the diagram of Figure 2, draw rays of light to show how light rays from the sun get reflected by the glass window into his eyes. [2] b) Light is part of the electromagnetic spectrum. Name the part of the electromagnetic spectrum which is responsible for: i) skin tanning [1] ii) use in TV remote control [1] iii) treatment of cancer patients [1] iv) cooking food [1] c) Name TWO common properties of electromagnetic waves. 3. A charged polythene strip is held close to a suspended strip labelled A. a) What is the type of charge on the polythene strip? [1] b) Strip A moves away when the polythene strip B is brought close to it. Give a reason. polythene B string A Physics Year 10 Track 2 2017 Page 3 of 12
c) Use ideas about movement of charge to explain how a polythene strip acquires a charge when rubbed with a cloth. [1] d) A certain type of rechargeable battery is capable of delivering a current of 0.2 A for 4000 s, before it needs to be recharged. Calculate: i) the total charge the battery can deliver before it needs to be recharged; ii) the maximum time it could be used without being recharged, if the current through it were 0.5 A. 4. A number of students have designed and built an electricpowered go-kart. Figure 3 shows how the velocity of the go-kart changes during a 40 second test race. a) Along which part of the graph is the go-kart s acceleration greatest? [1] K L b) What is the value of the maximum velocity of the go-kart? J M [1] Figure 3 c) Use the graph or otherwise, to calculate the acceleration of the go-kart between Points K and L. Page 4 of 12 Physics Year 10 Track 2 2017
d) Use the graph or otherwise, to calculate the distance covered by the go-kart during its deceleration. e) Calculate the total distance covered by the go-kart if the average speed is 6.5 m/s. 5. A camera was used to take photographs of a toy yacht. The camera contains a converging lens. a) Complete the ray diagram to show how the converging lens produces an image of the object O. Figure 4 O F F b) If each square represents 5 cm, the height of the image is cm. [1] [2] c) State TWO properties of the image formed. d) Determine the magnification of the lens. e) State ONE property of the image that would be produced if the object is placed between the lens and the principal focus. [1] Physics Year 10 Track 2 2017 Page 5 of 12
SECTION B Each question carries 15 marks. This section carries 45 marks of the total marks for this paper. 6. Angelo and Doreen set up a single water wave by pushing the water once with a piece of wood. They want to investigate how its velocity depends on the depth of water. a) Name the apparatus required to: i) measure the distance AB covered by the single plastic tank piece of wood 0.75 m 1 m d water B 2 m A Figure 5 wave: [1] ii) find the time taken for the wave to travel distance AB: [1] b) By referring to the diagram: i) find the distance covered by the water wave as it travels along AB [1] ii) calculate the depth of d of the water in the tank [1] c) It takes 1.6 seconds for the water wave to travel from A to B. Calculate the velocity of the water wave. d) Tick ONE correct precaution that is needed to ensure that the readings obtained are reliable. the tank must be a plastic one the water in the tank must be boiled before the experiment the tank containing water must be placed on a flat levelled surface the flat piece of wood used to set up a single wave in the tank must be very thin [1] Page 6 of 12 Physics Year 10 Track 2 2017
e) Doreen suggests that the deeper the water level the greater is the water wave velocity. She investigates this statement by measuring the velocity while varying the depth. Depth / m 0.0 0.05 0.10 0.15 0.20 0.25 0.30 Velocity / m/s 0.0 0.70 0.90 1.00 1.10 1.10 1.10 i) Plot a graph of Velocity in m/s on the y-axis against Depth of water in m on the x-axis. Draw the best curve through the points. [5] ii) Use your graph to find the approximate velocity of the water wave when the depth of the water in the tank is 0.45 m. m/s [1] f) Doreen now placed a barrier in front of the waves. Complete the diagram in Figure 6 to show how the water waves behave when passing through this barrier. Figure 6 [2] Physics Year 10 Track 2 2017 Page 7 of 12
Page 8 of 12 Physics Year 10 Track 2 2017
7. a) Two resistors R1 and R2 are connected in parallel as shown in the circuit diagram of Figure 7. i) Mark on the diagram the positive (+) and the negative terminal (-) of the battery. [2] ii) The voltage across R 1 is V. [1] iii) The voltage across R 2 is V. [1] b) Calculate the: i) total resistance of the circuit in ohms (Ω); 12 V R 1 = 3 R 2 = 6 Figure 7 ii) the total current in amperes, (A), flowing through the circuit; iii) the total charge in coulombs, (C), flowing through the circuit given that the circuit is turned on for 60 seconds. Physics Year 10 Track 2 2017 Page 9 of 12
c) Steve and Lucy investigate how the resistance of a resistor and a thermistor changes with temperature. They presented their data in the form of a graph, as shown in Figure 8. Figure 8 i) The table below shows the symbols of three electronic components. K L M State which of the symbols below represents a thermistor. [1] ii) Use the graph to underline the correct word within brackets in the following statements: The resistance of the thermistor (increases / decreases) as its temperature increases. The resistance of the resistor (increases / decreases) as its temperature increases. [2] iii) Use the graph to find the: temperature at which both the thermistor and the resistor have the same resistance, C [1] resistance of the thermistor and the resistor at this temperature. Ω [1] Page 10 of 12 Physics Year 10 Track 2 2017
8. Sean is travelling on his bicycle along a level road when he brakes and stops suddenly to avoid a dog which crosses his path. Sean finds himself thrown forwards from his bike. a) Arrows X and Y represent two forces acting on Sean while travelling on his bicycle. Name the two forces X and Y. Force X is the [1] Force Y is the [1] Y X Figure 9 b) Tick ONE correct statement. Sean is thrown forwards because he is carrying a load on his back. Sean is thrown forwards because when he brakes, the bicycle comes to a stop while he continues to travel forwards due to his inertia. Sean is thrown forwards because when he brakes, he comes to a stop while the bicycle continues to travel forwards due to its inertia. [1] c) Use some of the words in the grid below to complete the statement about Newton s first law of motion. moving big force external rest internal constant An object at remains at rest, while a object continues to move at velocity unless an resultant acts on it. [5] Physics Year 10 Track 2 2017 Page 11 of 12
d) Sean is cycling at 5 m/s. The bicycle has a mass of 10 kg and his mass is 60 kg. Calculate: i) the total mass in kg of Sean and his bicycle; [1] ii) the total initial momentum of Sean and his bicycle. e) Assuming that Sean s bicycle stops as soon as Sean applies the brakes, find: i) the total final momentum kg m/s; [1] ii) Sean s momentum while being thrown forwards from his bicycle kg m/s; [1] iii) the velocity with which Sean is thrown forwards. Page 12 of 12 Physics Year 10 Track 2 2017