Sri Lankan School Muscat Withdrawal Examination 2015/2016 Class : Subject : Paper : Duration: Year 11B/R Physics Name :... 1 2 Hours Q.No. Allocated 1 11 2 12 3 12 4 10 5 06 6 08 7 06 8 12 9 10 10 04 11 04 12 10 13 09 14 06 Total 120 Marks Obtained Percentage % Grade Admission No:. Instructions to Candidates: Write your name in your answer script. Answer ALL questions in the spaces provided in this booklet. Calculators may be usedshow all stages in any calculation and state the units if necessary. There are 14 questions and 31 pages in the paper. The Total marks for the paper is 120. Paper Set By: Mr. Dinesh Weerasinghe. 1 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
Answer all the Questions Q1. The diagram shows a water wave. (a) (i) The amplitude of the wave is A 1 cm B C D 2 cm 4 cm 8 cm (ii) The wavelength of the wave is A 2 cm B C D 4 cm 8 cm 20 cm (b) Describe one difference between transverse and longitudinal waves. Draw a labelled diagram to help your answer. (3) 2 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(c) State two properties that are the same for all electromagnetic waves. 1... 2... (d) Some types of wave are used in hospitals. (i) A scanner uses one type of wave to check for broken bones. The type of wave emitted by the scanner is A infrared B C D microwaves sound X rays (ii) An image of the bone is seen because the waves from the scanner are A absorbed by the bone B C D reflected by the bone refracted by the bone transmitted by the bone 3 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(iii) Name one type of wave that is used in cancer treatment and explain what it does during the treatment. Type of wave... Explanation of what it does... (Total for question 1 = 11 marks) 4 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
Q2. (a) A student uses this apparatus to investigate how the resistance of a thermistor changes with temperature. (i) Draw a circuit diagram for this investigation. 5 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) The student wants to measure the voltage across the thermistor. On your diagram, add a symbol to show how she should connect the voltmeter to the circuit. (iii) Explain how the student can use the apparatus to investigate how the resistance of the thermistor varies with temperature between 0 C and 100 C. (5) 6 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(b) The graph shows the student's results. Two students discuss the line of best fit for this graph. One student thinks it is the curved line A. The other student thinks that it is the straight line B. (i) Suggest which line is better, giving a reason for your choice. 7 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) Suggest why measuring the resistance of the thermistor at 10 C could help to decide which line is better. (c) These graphs show the voltage (V) changes with the current (I) for three components. The components are a metal wire at constant temperature, a diode and a filament lamp. Which letter represents the correct graph for each component? metal wire at constant temperature... diode... filament lamp... (Total for question 2 = 12 marks) 8 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
Q3. A train travels 9 km from station A to station B. It takes 15 minutes. (a) (i) State the equation linking average speed, distance moved and time taken. (ii) Calculate the average speed of the train and give its unit. (3) Average speed =... unit... (iii) The maximum speed of the train must be higher than the value you have calculated. Explain why. 9 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(b) The train continues along a straight track from station B to station C. The graph shows how the velocity of the train changes with time during this part of the journey. (i) Use the graph to calculate the acceleration of the train, in m/s 2, during the first 100 seconds after it leaves station B. (3) Acceleration =... m/s 2 (ii) Use the graph to calculate the distance, in m, between station B and station C. (3) Distance =... m 10 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015 (Total for question 3 = 12 marks)
Q4. Radon is a gas produced by some types of rocks. (a) Radon is a natural source of radioactivity. What is the name for this radioactivity? A background radiation B C D chain reaction radioactive dating radiotherapy (b) There are two sources of alpha radiation in some houses: radon gas in the air solid americium in a smoke alarm The alpha particles from radon are a greater risk to health than the alpha particles from americium. Explain why. (c) Radon-222 and radon-220 are both isotopes of radon. (i) A nucleus of radon-222 has 86 protons. How many protons are there in a nucleus of radon-220? A 86 B less than 86 C more than 86 D none 11 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) A nucleus of radon-222 has 136 neutrons. How many neutrons are there in a nucleus of radon-220? A 86 B 134 C 136 D 220 (d) The graph shows how the activity of a sample of radon-220 changes with time. (i) Complete the graph by adding the missing unit for activity. (ii) Explain what is meant by the term half-life. 12 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(iii) Use the graph to find a value for the half-life of radon-220. Half-life =... s (Total for question 4 = 10 marks) Q5. Echo sounding is used to detect fish in the sea. Sound waves are emitted from a fishing boat. Some of the sound waves are reflected by fish and detected back at the boat. (a) The shortest time between the sound waves being emitted and detected is 0.26 s. The speed of sound in water is 1.5 km/s. Calculate the distance between the boat and the nearest fish. (4) distance =... m (b) Each sound wave is emitted for a very short time. The reflected sound wave received at the boat lasts for a longer time. Suggest a reason for this difference in time. 13 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(Total for Question 5 = 6 marks) Q6. This question is about an electric kettle. (a) The Sankey diagram represents the energy transfers taking place when the kettle heats some water. 14 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
What is the efficiency of the kettle? A 0.1 B 0.9 C 200 D 1800 (b) Why does the heating element in the kettle get hot when its electrical supply is switched on? (c) The power of the heating element in the kettle is 2000 W when it is connected to a 230 V mains supply. (i) State the equation linking power, current and voltage. (ii) Show that the current in the heating element is approximately 9 A. (iii) The plug of the kettle has a fuse. Fuses are available in values of 1 A 3 A 7 A 13 A Current =... A Identify the fuse that is the most suitable for this kettle, and explain why. 15 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(Total for question 6 = 8 marks) Q7. Photograph E shows a rechargeable torch. (a) When a student shakes the torch, the magnet moves through the coil and back again. This induces a voltage across the ends of the coil. The voltage is used to provide current to recharge the battery. (i) Explain why a voltage is induced. 16 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) State one way to increase this voltage. (b) Photograph F shows the components inside the torch. The torch uses a light-emitting diode (LED) to provide light. (i) When the LED is on, it shows that A the current is alternating B C D the torch is switched off there is a current in the circuit there is a fault in the circuit (ii) The manufacturer of the torch states, "An LED is a more efficient source of light than a filament lamp." Explain this statement in terms of energy transfer. 17 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(Total for question 7 = 6 marks) Q8. This question is about three different methods used to cook potatoes. (a) On a traditional cooker, a potato is placed in water in a pan on top of a hot plate. Describe how energy is transferred from the hot plate to heat up all of the potato. (4) 18 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(b) A microwave cooker is often said to 'cook the food from the inside'. Explain whether this statement is true by describing how energy is transferred to heat up all of the potato. (3) (c) In an induction cooker, there is a coil under the surface of the cooker. A potato is placed in water in a metal pan. An alternating current is switched on in the coil under the pan. The coil does not heat the surface of the cooker. Describe how energy is transferred to heat up all of the potato. (5) 19 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(Total for question 8 = 12 marks) 20 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
Q9. A student investigates terminal velocity. She uses a tall glass tube filled with oil. She drops a metal ball into the tube. The ball falls through the oil. (a) Use ideas about forces to explain how a falling object can reach a terminal velocity. (5) 21 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(b) Describe how the student could find out if the ball reaches terminal velocity as it falls through the oil. In your answer, you should include the measuring instruments that the student will need the measurements that she should take how she could use her measurements to find out if the ball reached terminal velocity. You may include a labelled diagram in your answer. (5) 22 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(Total for question 9 = 10 marks) Q10. A student measures the length of a pencil. The photograph shows the arrangement she uses. The student says: The student may not be correct. (a) Use the photograph to estimate the length of the pencil and give its unit. Length =... unit... 23 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(b) Suggest two ways that the student could improve the accuracy of this measurement, using only the equipment shown in the photograph. 1.... 2... (Total for question 10 = 4 marks) Q11. (a) Some units can be written in different ways. (i) A power of 1 watt is the same as A 1 joule per coulomb (1 J/C) B 1 joule per second (1 J/s) C 1 newton per square metre (1 N/m 2 ) D 1 newton per kilogram (1 N/kg) (ii) A pressure of 1 pascal is the same as A 1 joule per coulomb (1 J/C) B 1 joule per second (1 J/s) C 1 newton per square metre (1 N/m 2 ) D 1 newton per kilogram (1 N/kg) (b) Magnetic fields can be indicated using lines. (i) The arrow on a magnetic field line shows A the direction of a magnetic field B C D the electrostatic attraction the presence of an electric current the strength of a magnetic field 24 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) Equal spaces between magnetic field lines show that the magnetic field A has uniform strength B C D goes from a S-pole to a N-pole must be caused by a current must be caused by a bar magnet (Total for question 11 = 4 marks) Q12. This question is about the Solar System. (a) The object at the centre of our Solar System is A a comet B C D the Earth the Moon the Sun (b) Earth and Mars are planets in our Solar System. The table shows some data for these planets. (i) Calculate the orbital speed of Mars in km / day. speed =... km / day 25 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) The distance between Earth and Mars varies between 100 million km and 400 million km. Explain why this distance is not constant. You may draw a diagram to help your answer. (c) Visible light from Mars reaches the Earth. The speed of light is 300 000 km/s. (i) Show that when the planets are 170 000 000 km apart, it takes about 600 s for light to travel this distance. (3) 26 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) Scientists land a remote-controlled vehicle on Mars. The vehicle sends images back to Earth showing its surroundings on Mars. Sometimes these images show rocks ahead that could damage the vehicle. A scientist on Earth sends radio signals that control this vehicle. The speed of the vehicle is limited to 0.04 m/s. Suggest why the speed is kept low. (Total for question 12 = 10 marks) 27 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
Q13. Builders work on a new house. A builder carries a concrete block from the ground up to the top of the scaffolding. (a) (i) State the equation linking gravitational potential energy, mass, g and height. 28 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(ii) The concrete block has a mass of 18 kg. Calculate the gravitational potential energy gained by the concrete block if the scaffolding is 5 m high. Gravitational potential energy =... J (iii) What is the link between the gravitational potential energy gained by the concrete block and the work done by the builder to lift it? (b) The builders fit a layer of insulating material in the roof of the house. The diagram shows a section through the insulating material. Explain how the insulating material reduces the amount of heat lost through the roof by conduction, convection and radiation. conduction (5) convection 29 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
radiation (Total for question 13 = 9 marks) Q14. (a) The diagram shows some electrical circuit symbols. (i) Which symbol represents a switch? A B C D (ii) Which symbol represents a diode? A B C D 30 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
(b) A hairdryer connected to the mains supply takes a current of 5.5 A. (i) Which of these fuses should be used with the hairdryer? A 3 A B C D 5 A 7 A 13 A (ii) Explain your answer. (iii) The hairdryer has a plastic case so there is no need for an earth wire connection in the plug. Explain why the hairdryer is still safe to use. (Total for question = 6 marks) ( Total marks for the paper 120 marks) 31 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015
32 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015