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1 Oxford Cambridge and RSA H Friday 17 June 2016 Morning GCSE TWENTY FIRST CENTURY SCIENCE PHYSICS A/ADDITIONAL SCIENCE A A182/02 Modules P4 P5 P6 (Higher Tier) * * Candidates answer on the Question Paper. A calculator may be used for this paper. OCR supplied materials: None Other materials required: Pencil Ruler (cm/mm) Duration: 1 hour * A * INSTRUCTIONS TO CANDIDATES Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters. Use black ink. HB pencil may be used for graphs and diagrams only. Answer all the questions. Read each question carefully. Make sure you know what you have to do before starting your answer. Write your answer to each question in the space provided. If additional space is required, you should use the lined page(s) at the end of this booklet. The question number(s) must be clearly shown. Do not write in the bar codes. INFORMATION FOR CANDIDATES The quality of written communication is assessed in questions marked with a pencil ( ). A list of useful relationships is printed on page 2. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 60. This document consists of 24 pages. Any blank pages are indicated. [Y/601/7514] DC (LEG/FD) /3 OCR is an exempt Charity Turn over
2 2 TWENTY FIRST CENTURY SCIENCE EQUATIONS Useful relationships The Earth in the Universe distance = wave speed time wave speed = frequency wavelength Sustainable energy energy transferred = power time power = voltage current efficiency = energy usefully transferred total energy supplied 100% Explaining motion speed = distance travelled time taken acceleration = change in velocity time taken momentum = mass velocity change of momentum = resultant force time for which it acts work done by a force = force distance moved in the direction of the force amount of energy transferred = work done change in gravitational potential energy = weight vertical height difference kinetic energy = 1 2 mass [velocity]2 Electric circuits power = voltage current resistance = voltage current voltage across primary coil voltage across secondary coil = number of turns in primary coil number of turns in secondary coil Radioactive materials energy = mass [speed of light in a vacuum] 2
3 3 BLANK PAGE Question 1 begins on page 4 PLEASE DO NOT WRITE ON THIS PAGE Turn over
4 4 Answer all the questions 1 Roy is stacking shelves at the supermarket. He lifts boxes of tins from the floor to the shelves. (a) Each tin weighs 5 N. An empty box weighs 2 N. (i) What is the smallest force that Roy has to pull on a box of 4 tins when lifting it? force =... N [1] (ii) Roy lifts a box of 4 tins from the floor to a shelf 0.5 m above the floor. box of 4 tins 0.5 m Calculate how much gravitational potential energy the box gains. Include the correct unit in your answer. gain in gravitational potential energy =... unit...[2]
5 (iii) Roy I get hot when lifting the tins. I must be using more energy than the tins gain. 5 State what is meant by conservation of energy and explain how it applies to Roy [2] (b) A box of tins of total mass 3.2 kg, weight 32 N, falls from a shelf. The shelf is 1.5 m above the ground. Calculate the speed of the box just before it hits the ground. Show your working. You may assume that the effect of air resistance is negligible. speed =... m/s [3] [Total: 8] Turn over
6 2 Lorries are fitted with tachometers that automatically record their speed and distance travelled. The data from the tachometer can be used to produce graphs. (a) Here is the distance-time graph for a journey lasting 20 s. 150 distance (m) time (s) Use the graph to determine: (i) The time when the lorry has the greatest instantaneous speed. time =... s [1] (ii) The average speed for this journey. average speed =... m/s [2] (iii) Here are some descriptions of the motion of the lorry during this 20 s journey. Put a tick ( ) in the box next to the correct description. Speed increases, then decreases until the lorry becomes stationary. Speed increases, then decreases until the lorry is moving at constant speed. Speed increases until the lorry moves at constant speed. Speed increases until the lorry becomes stationary. [1]
7 (b) The diagram shows the forces acting on a stationary lorry kn weight = 440 kn (i) The downward force on the lorry is called weight. What is the name of the upward force?... [1] (ii) The lorry driver says that these two forces must be an interaction pair of forces as they are equal and opposite. Explain why the driver is wrong [2] [Total: 7] Turn over
8 8 3 Cars are built with a number of safety features to reduce the chance of injury to the passengers during a collision. Seat belts and airbags are two of these features. seat belts airbags Use ideas about forces to explain why passengers are injured in a collision and how seat belts and airbags reduce the injury. The quality of written communication will be assessed in your answer.... [6] [Total: 6]
9 9 4 The electrical energy supplied to homes in the UK comes from power lines that carry the energy at very high voltage. Transformers are used to change the voltage between the power lines and homes. The diagram shows a transformer. primary coil secondary coil core Explain how the voltage across the secondary coil is produced.... [3] [Total: 3] Turn over
10 10 5 (a) Maria is investigating the generation of electricity. She pushes the north pole of a magnet into a coil of wire. The coil is connected to a sensitive voltmeter. coil S N V The voltmeter gives a reading when the magnet is moving. (i) What is the name of the process that produces the voltage?... [1] (ii) State one change that Maria can make to produce a voltage in the opposite direction.... [1] (b) Maria investigates an a.c. generator (dynamo) from a bicycle. rotation permanent magnet N S coils of wire electrical output A voltage is produced when the magnet rotates. (i) She connects a lamp to the output of the generator. The lamp glows more brightly when she rotates the magnet faster. State why the lamp glows more brightly.... [1]
11 (ii) 11 The magnet is rotated at a constant speed. Which graph shows how the voltage of this a.c. generator changes during one complete rotation of the magnet? Put a ring around the letter next to the correct answer. A B voltage voltage time time C D voltage voltage time time [1] (iii) In some generators the coil is wound on a solid core so that a lamp lights at slower speeds of rotation. State the name of the material used for the solid core.... [1] [Total: 5] Turn over
12 6 Tim is investigating whether the resistance of a piece of wire varies with the current through it. Here are his results. 12 (a) Tim s friends talk about his results. Current (A) Resistance (Ω) Abe Tim needs to make more readings. Chris A graph would help to interpret the results. Eve There is a positive correlation between the current and resistance. Dan Tim has kept the wire at the same temperature. Ben There are more collisions between the moving charges and ions in the wire as the current increases. (i) Who draws a valid conclusion from the data?... [1] (ii) Who suggests an explanation?... [1]
13 13 Tim also connects resistors in series and parallel. (b) He sets up this series circuit. 1.5 V V 1.0 V (i) Calculate the resistance of R 1. A 0.2 A R 1 R 2 resistance of R 1 =... Ω [1] (ii) What is the voltage across R 2? voltage across R 2 =...V [1] (c) He sets up this parallel circuit. 1.5 V X Y 1.5 V 0.4 A A (i) What is the voltage between points X and Y? Z voltage =...V [1] (ii) All the resistors have the same resistance. What is the current through point Z? current =...A [1] [Total: 6] Turn over
14 14 7 Sarah is investigating the resistance of wires connected in parallel. She uses three wires that are all the same as each other. She connects the three wires in parallel and uses a resistance meter to measure the resistance. resistance meter wires in parallel Sarah does this again for two wires in parallel. These are her results: Number of wires in parallel arrangement Resistance (Ω) Sarah thinks that there is a correlation between the number of wires and the resistance of the parallel arrangement. Explain the correlation in Sarah s results and describe ways she could improve this investigation. The quality of written communication will be assessed in your answer.... [6] [Total: 6]
15 8 Radioactive sources are used in hospitals. 15 Radioactive tracers allow the doctor to investigate organs in a patient s body without surgery. The patient has a radioactive tracer injected into a vein. The hospital has four radioactive sources, A, B, C and D. Radioactive source Radiation emitted Activity (counts per minute) At start After 1 hour After 2 hours A α B α C γ D γ The doctor wants to use a tracer with a half-life of about 1 hour. Which radioactive source should the doctor use as the tracer? Justify your choice using the data in the table.... [3] [Total: 3] Turn over
16 9 Pete lives near the site of a planned new nuclear power station. 16 He has read about how nuclear power stations produce energy. (a) In the new power station the maximum amount of uranium converted to energy every second will be kg. Calculate the maximum energy that will be released every second. The speed of light is m/s. Show your working. maximum energy every second =... J [2] (b) Pete is concerned about the high level waste produced by the nuclear power station. Describe how high level waste is disposed of [2]
17 (c) Pete expresses another concern to Ali. 17 Pete I m very concerned that it is highly likely a nuclear accident will occur at the power station. Ali Statistics show that the chance of a nuclear accident at a power station is far less than being involved in a road accident. Suggest reasons why Pete over-estimates the risks from a nuclear accident at a power station [3] Question 9 continues on page 18 Turn over
18 18 (d) People who work in nuclear power stations wear a badge to monitor the type of ionising radiation they are exposed to. One type of badge consists of a photographic film behind three windows made of different materials, aluminium, lead and card. card film lead aluminium The film becomes fogged (darkened) if radiation passes through the window. Fogged areas are shown as in the following diagrams. (i) Suggest why this badge cannot be used to detect α radiation [1]
19 (ii) Draw one straight line from each type of radiation to its correct film. 19 Film Type of radiation only only [2] [Total: 10] Turn over
20 20 10 In the UK some vegetables are sterilised by radiation during processing in order to extend their shelf-life. The radiation is from a radioactive source. A label on the pack states that the vegetables have been irradiated. Donna is shopping and reads the information on the pack. She expresses her concerns to her friend. I m worried that I will be contaminated if I eat these vegetables. Explain how irradiating vegetables extends their shelf-life and give reasons why Donna s concerns are unfounded. The quality of written communication will be assessed in your answer.... [6] [Total: 6] END OF QUESTION PAPER
21 21 ADDITIONAL ANSWER SPACE If additional space is required, you should use the following lined page(s). The question number(s) must be clearly shown in the margin(s).
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24 24 Oxford Cambridge and RSA Copyright Information OCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website ( after the live examination series. If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity. For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1GE. OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
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