GCSE (9 1) Combined Science A (Physics) (Gateway Science) J250/11 Paper 11, P4 P6 and CS7 (PAGs P1 P6)

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1 Oxford Cambridge and RSA GCSE (9 1) Combined Science A (Physics) (Gateway Science) Paper 11, P4 P6 and CS7 (PAGs P1 P6) (Higher Tier) Year 11 Test Time allowed: 1 hour 10 minutes You must have: a ruler (cm/mm) the Data Sheet for GCSE Combined Science A (Physics) You may use: a scientific or graphical calculator an HB pencil H First name Last name Centre number Candidate number INSTRUCTIONS Use black ink. You may use an HB pencil for graphs and diagrams. Complete the boxes above with your name, centre number and candidate number. Answer all the questions. Write your answer to each question in the space provided. Additional paper may be used if necessary but you must clearly show your candidate number, centre number and question number(s). INFORMATION The total mark for this paper is 60. The marks for each question are shown in brackets [ ]. Quality of extended responses will be assessed in the question marked with an asterisk (*). This document consists of 24 pages. DC (LK/SG) /4 OCR is an exempt Charity Turn over

2 2 SECTION A You should spend a maximum of 20 minutes on this section. Answer all the questions. 1 This question is about work done and power in physics. Work done Power A Energy transferred between stores Measured in J B Energy transferred between stores Rate of energy transfer between stores C Rate of energy transfer between stores Energy transferred between stores D Rate of energy transfer between stores Measured in W Which row of the table is correct? Your answer [1] 2 A wooden block is placed on an electronic balance. Electronic balance 220 g Wooden block The electronic balance reads 220 g. What is the weight of the wooden block? A B C D 2.2 g 2.2 N 220 g 220 N Your answer [1]

3 3 3 A plastic rod is negatively charged. Which statement about the plastic rod is correct? A B C D It has gained electrons. It has gained protons. It has lost electrons. It has lost protons. Your answer [1] 4 This is a velocity-time graph. Velocity (m / s) 0 Time (s) What does the shaded area represent? A B C D Acceleration Deceleration Displacement Velocity Your answer [1] Turn over

4 5 Fleming s left hand rule is used to find the direction of magnetic force, magnetic field or current. thumb finger 1 4 finger 2 What do the thumb, finger 1 and finger 2 represent? Thumb Finger 1 Finger 2 A Force Current Magnetic field B Force Magnetic field Current C Magnetic field Current Force D Magnetic field Force Current Your answer [1] 6 The graph shows how the acceleration of an object depends on the resultant force acting on it. Acceleration (m / s 2 ) 2 Force (N) 5 What is the mass of the object? A B C D 0.4 kg 2.5 kg 5.0 kg 10 kg Your answer [1]

5 5 7 A skydiver jumps out of a plane. This is the speed-time graph for the skydiver. Speed (m / s) P Time (s) Which row is correct when the skydiver is at P? Forces Motion A Air resistance is zero Constant acceleration B Weight equals air resistance Constant speed C Weight is greater than air resistance Acceleration decreasing D Weight is less than air resistance Acceleration increasing Your answer [1] Turn over

6 6 8 A student investigates a diode. She wants to find how current through the diode changes as p.d. across it changes. She uses this circuit. X Z Y X Y Z A Changes p.d. Measures current Measures p.d. B Changes p.d. Measures p.d. Measures current C Measures p.d. Changes p.d. Measures current D Measures p.d. Measures current Changes p.d. Which row of the table is correct? Your answer [1]

7 9 A child makes a tower using two building blocks. 7 P Q Block P Floor The Earth produces a downward force on block P. Which statement describes the Newton s third law pair for this force? A Block P produces an upward force on the Earth. B Block Q produces a downward force on block P. C Block Q produces an upward force on the Earth. D The earth produces a downward force on block Q. Your answer [1] 10 A car travels at 12 m / s. The car then accelerates at 3 m / s 2 until it reaches a speed of 18 m / s. Use the formula: (final velocity) 2 (initial velocity) 2 = 2 acceleration distance Calculate the distance the car travels. A B C D 2 m 6 m 30 m 60 m Your answer [1] Turn over

8 8 SECTION B Answer all the questions. 11 A teacher decorates his classroom using a set of Christmas tree lights. (a) Each light bulb in the set is labelled A, 1.1 W. These are the normal working conditions for each light bulb. Springy metal Filament Connecting wires (i) Show that the resistance of one light bulb is about 130 when the light bulb works normally. State the unit for resistance. Answer =... unit:... [4] (ii) The set of lights is made up of 20 light bulbs connected in series. Calculate the total resistance of the 20 light bulbs in series. The resistance of one light bulb is 130. Answer =... [1]

9 (b) The teacher switches off the set of lights and removes a light bulb. He measures the resistance of the light bulb. 9 The reading is 30. Explain why the teacher s value is less than [2] (c) The filament in the light bulb is attached to two springy pieces of metal. If the filament breaks, the springy pieces of metal join together. Pieces of metal joined Springy metal (i) Suggest why this is a useful design [1] Turn over

10 10 (ii) The manufacturer gives a warning with the set of lights. Broken lamps should be changed as soon as possible. Suggest why [2] (d) The teacher shows his class an LDR. The graph shows how the resistance of the LDR changes Resistance (Ω) Brightness (arbitrary units) Describe the trend shown by the graph [2]

11 11 12 A student measures the spring constant of a spring. (a) Complete the table to show the equipment he uses to take the measurements. Measurement Apparatus needed Extension of spring Force on spring [1] (b) Describe two precautions the student uses to take accurate readings [2] (c) The student plans to write a risk assessment for the practical. (i) Suggest a possible hazard for this experiment [1]. (ii) What control measures should the student use to minimise the risk from the hazard in 12(c)(i)? [1] Turn over

12 12 13* Student F jogs across a field to get to school. Student R jogs along a footpath to get to school. This is a diagram of the routes they take. The diagram is not drawn to scale. Start Student F 300 m 500 m field Student R 400 m School Each student takes 200 s to get to school. Explain the distinction between vectors and scalars. Use examples from the diagram. You should include calculations of speed and velocity in your answer [6]

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14 14 14 The way scientists model atoms has changed over time. Some important events are shown below JJ Thomson suggested the plum pudding model of an atom 1909 Geiger and Marsden investigated atoms with experiments 1911 Rutherford suggested the atom contained a nucleus 1913 Geiger and Marsden s experiments supported the existence of the nucleus 1913 Bohr suggested electrons travel in orbits (a) Rutherford came up with a new model of the atom in He said the atom was: Made up of a nucleus Surrounded by electrons. Nucleus Electron (i) Suggest why Rutherford came up with a new model [1] (ii) State two properties of the nucleus in Rutherford s model [1] [1]

15 15 (b) There are problems with Rutherford s model. (i) The electrons cannot stay still. Explain why the electrons must move around the nucleus. Use ideas about electric charge in your answer [2] (ii) Bohr suggested the electrons travel in stable circular orbits. Nucleus Electron Orbit Explain why the electron is accelerating, even if its speed stays the same [2] Turn over

16 16 15 This question is about solids, liquids and gases. (a) A student pours 25 cm 3 of water into a measuring cylinder. She drops a piece of polystyrene into the water. The polystyrene floats on the water. Polystyrene Water Measuring cylinder The polystyrene is in equilibrium. Explain what this statement means. Draw a free-body force diagram to help explain your answer [3]

17 17 (b) The student starts the experiment again. She pours 25 cm 3 of water and 25 cm 3 of oil into an empty measuring cylinder. Oil Water She places the measuring cylinder, oil and water on an electronic balance. Here are her readings: mass of measuring cylinder = g mass of measuring cylinder + water + oil = g (i) The density of water is 1 g / cm 3. Use the formula: density = mass / volume Show that the mass of the oil is 22.5 g. Answer =...[3] (ii) The student adds a few drops of washing-up liquid to the oil and water. She shakes the measuring cylinder. The oil and water mix to form an emulsion. Emulsion Show that the average density of the emulsion is 0.95 g / cm 3. State any assumptions you make in your calculation. Answer =...[2] Turn over

18 18 (c) The student blows up a balloon. She takes the balloon outside. The temperature outside is less than the temperature inside. The balloon deflates. Explain why [2]

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20 20 16 A child is playing with toy cars and a race track. (a) The child rolls a car down the curved track from A to B. A 0.8 m B (i) The mass of the toy car is 0.03 kg. The height of the track is 0.8 m. Use the formula: gravitational energy = mass height gravitational field strength (g) Calculate the gravitational energy of the toy car at A. Use the constant: gravitational field strength (g) = 10 N / kg. (ii) State the kinetic energy when the car reaches point B. You may neglect any effects of friction. Answer =... J [2] (iii) Use the formula: kinetic energy = 0.5 mass (speed) 2 Show that the speed of the toy car at B is 4 m / s. Answer =... J [1] Answer =... m / s [3]

21 21 (b) (i) Define momentum [1] (ii) The child places a stationary toy car at point B. The child rolls the first car down the track again. The cars collide at B. First car mass = 30 g Stationary car 4 m / s mass = 20 g? m / s Before collision B After collision The cars stick together and move off with the same speed. The mass of the stationary car is 20 g. Calculate the speed of the two cars when they move off together. Answer =... m / s [3] END OF QUESTION PAPER

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