Semestral Assessment 1

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NERR SEONRY SHOOL Semestral ssessment 1 Secondary 3 Express SUJET: Science Physics ate: 8 th May 2009 Paper 1 & 2 uration: 1 hour 45 mins Name: ( ) lass: INSTRUTIONS TO NITES: 1 o not open this

3 Section nswer all questions in this section. hoose the one answer,,, or, you considered correct and record your choice in soft pencil on the OS. 4 Section nswer all questions in this section.

1 NERR SEONRY SHOOL Semestral ssessment 1 Secondary 3 Express SUJET: Science Physics ate: 8 th May 2009 Paper 1 & 2 uration: 1 hour 45 mins Name: ( ) lass: INSTRUTIONS TO NITES: 1 o not open this booklet until you are told to do so. 2 Write your name, class and index number in the spaces on this page and the Optical nswer Sheet (OS). Shade your index number on the OS. 3 Section nswer all questions in this section. hoose the one answer,,, or, you considered correct and record your choice in soft pencil on the OS. 4 Section nswer all questions in this section. You are to write your answers in the spaces provided. 5 Section nswer all questions in this section. You are to write your answers in the spaces provided. 6 You may use a calculator for this examination. 7 t the end of the examinations, hand in your question booklet and OS separately. FOR MRKER S USE Section Marks warded Max Marks Total 85 This question paper consists of 16 printed pages including the cover page. 1 Setter: Mr avid Oon

2 Section There are 20 questions in this section. nswer all the questions. For each question, there are four possible answers,,, and. hoose the one you consider correct and record your choice in soft pencil on the OS 1 Figure below shows a faulty vernier caliper that was used to measure the diameter of a coin. Given that its error is +0.3 mm with its jaws fully closed, what is the actual diameter of the coin? 6.5 mm 7.1 mm 7.5 mm 8.1 mm 2 The diagram shows the scale of a micrometer screw gauge used to measure a 400 pages book. 35 What is thickness of one piece of paper? mm mm 1.45 mm 5.81 mm 2

3 3 The diagram below shows a simple pendulum at the ends and centre of its swing. The period of this pendulum is 1.2 s. Which labeled arrow shows the distance moved by the pendulum in 0.9 s? 4 Two forces X and Y act on an object, causing a resultant force Z. Which diagram best represents the directions of vectors X and Y and their resultant Z? ns= 5 Which of the following correctly states the properties of a liquid? Hard to compress, has fixed shape and no fixed volume. Hard to compress, has no fixed shape but fixed volume. Easy to compress, has no fixed shape and no fixed volume. Easy to compress, has no fixed shape but fixed volume. 6 Some air is heated inside a sealed chamber of fixed volume. Which of the following does not increase? The average distance between air molecules The average kinetic energy of air molecules The number of collisions between air molecules and walls of container The force due to collisions between air molecules and walls of container 3

4 7 cube of ice is placed on a metal table. fter some time, the ice starts to melt. Which of the following is incorrect about the transfer of energy between the ice cube and its surroundings? onvection current occurs above the ice cube causing it to melt. Heat is conducted from the table into the ice. Heat from the surroundings is absorbed by the ice through radiation Heat is conducted from the surrounding air into the ice. 8 n experiment is carried out as shown in the diagram below. Why does it take a long time for ice to melt, even though water at the top of the test tube is boiling? Ice is a poor conductor of heat. Water is a poor conductor of heat. onvection current cannot be created in water. The gauze prevents energy from reaching the ice. 9 In the process of convection, energy is transferred because of density differences in a fluid. because of temperature differences in a solid. by the diffusion of molecules throughout a fluid. by the vibration of molecules about a mean position. 10 uring melting, molecules are absorbing the latent heat of fusion absorbing the latent heat of vaporization releasing the latent heat of fusion releasing the latent heat of vaporization 4

11 solid substance at room temperature is placed inside a beaker. thermocouple is used to measure its temperature. The beaker and its content are then heated steadily.

5 11 solid substance at room temperature is placed inside a beaker. thermocouple is used to measure its temperature. The beaker and its content are then heated steadily. The graph below shows the temperature of the substance during the experiment. Temp Y Z U V W X Time etween which two points on the graph does the beaker contain a mixture of solid and liquid? U W V W W - X X - Y 12 The rise in temperature of a substance causes the internal energy to increase. This is due to the increase in kinetic energy of the molecules potential energy of the molecules elastic energy of the molecules kinetic and potential energy of the molecules 13 The diagram below shows a wave on the sea. Which points represent half a wavelength apart? P and S Q and R Q and T S and T 5

6 14 The diagram below shows a cross-section of a water wave. Which distance is the amplitude of the wave? ns = 15 surf-board moves at a speed of 5 m/s on the crest of a wave. The distance between successive wave crests is 10 m. What is the frequency of the wave motion? 0.5 Hz 2 Hz 5 Hz 10 Hz 16 What is a property of all electromagnetic waves? They have the same frequency They travel at the speed of sound They have the same energy level They travel through a vacuum 17 Which of the application of components of the electromagnetic wave spectrum is incorrect? omponent of pplication e.m. wave Microwave Satellite communication Visible light Optical fibres for medical uses X-rays Fluorescence effect Gamma rays Treatment of cancer 18 Which of the following gives the closest estimated speed of sound in the 3 different objects? ir Water Steel 330 ms ms ms ms ms ms ms ms ms ms ms ms -1 6

7 19 stronauts are in a space-ship orbiting the Moon. Explain why they can see but cannot hear the explosion? Explosions cannot occur in space. Sound cannot travel through a vacuum. Sound is reflected from the space-ship. Sound travels too quickly through space to affect the ear drum. 20 loud speaker emits sound waves. In which direction does the air vibrate? QP only RS only QP and TU RS and TU nswers

8 Section nswer all the questions. Write your answers in the spaces provided on the question paper. 1 Eilfi is playing with a remote control (R) helicopter. The specifications from the manufacturer are shown below. Specifications: Maximum speed = 35 km/h Time from 0 to max speed = 5 s R transmitter frequency = 13.9 MHz uration of battery charging = 1 hour R range = 500 m (a) (c) (d) (d) How many physical quantities are given in the specifications? Five [1] How many physical quantities in the specifications have prefixes? Two. [1] Write in full the prefixes that are used in the specification above. k = kilo; M = Mega. [1] onvert into standard form, 1.39 x MHz =... Hz [1] Is the maximum speed given in the above specifications a scalar or vector quantity? Explain. The maximum speed given is a scalar. because it only has magnitude but does not have direction.. [2] 8

9 2 The diagram below shows a simple experiment that was conducted to determine the relationship between pressure and volume of a gas at constant temperature. syringe with a pressure gauge was filled with oxygen. The original setup is shown in diagram. When the piston is pushed downwards, the pressure inside the syringe increases as shown in. When the piston is pulled upwards, the pressure inside the syringe was observed to decrease as in. Min Max (a) (c) Min Max Min Max Setup Setup Setup With the help of the kinetic theory of matter, explain how the gas above exerts pressure inside the syringe. Particles are always in constant and random motion [1] These particles collide with walls, exerting pressure on them [1] (Force per unit area is pressure) [2] What can you conclude from the above experiment about the relationship of pressure and volume of a fixed mass of gas at constant temperature? When volume decreases, pressure increases. When volume increases, pressure decreases. OR pressure is inversely proportional to volume [1] gain with the help of the kinetic theory of matter, explain the change from setup to. When volume is reduced, the frequency of [1] collisions between particles with container surfaces increases. [1] Hence pressure increases. [2] 9

10 2 (d) State what happens to the average distance between molecules of oxygen (cont) gas and the average kinetic energy of the molecules when setup is changed to. Use the following choice of words: increases, remains unchanged; decreases increases (i) average distance.. [1] remains unchanged (ii) average kinetic energy... [1] 3 metal can has polished surfaces. similar can has its surfaces painted black. The figure below shows how the temperature of each can varies over a short period of time after they are moved into strong sunlight. (a) (c) What is the name given to the process by which energy reaches the can from the Sun? Radiation.. [1] Which component of the Sun s electromagnetic spectrum produces the greatest heating effect? Infra-red.. [1] Which can, or, is the one painted black? Give a reason for your answer. an is painted black. [1] lack surface is a better absorber of energy [1] than polished surfaces hence it can quickly absorb heat... [2] 10

11 4 One end of a copper bar and one end of an iron bar of the same size were placed side by side in a fire. (a) The heated end of the iron bar becomes red hot. The heated end of the copper bar did not become red hot. What can be deduced from these observations? opper is a better conductor compared to iron. [1] Hence thermal energy can be quickly transferred away from heated end to the other end of the copper rod. [1] [2] Which rod could be removed by hand with less risk of being burnt? iron [1] 5 The diagram below shows how the temperature of liquid substance Z in a beaker changed as it was heated continuously for some time. Temperature ( o ) Time (minutes) (a) What was the boiling point of the substance Z? 80 o. [1] Explain why does the temperature during boiling process remains constant despite continued heating. Thermal energy from heating is used to break the forces between particles. [1] Instead of changing into kinetic energy of particles. [1] [2] (c) From 4 minutes onwards, what is the state of substance Z? mixture of liquid and gas. [1] 11

12 6 (a) student had just completed a swimming lesson in strong sunlight. She climbed out from the swimming pool and immediately felt cold even though there was no wind. Explain. Water on her skin evaporates. [1] Evaporation causes a cooling effect. [1]. [2] Write down two differences between boiling and evaporation. ubbles are seen during boiling, not evaporation [1] oiling happens in all parts, while evaporation occurs only at the surface of the liquid [1] (ny other correct answers). [2] 7 The diagram shows a coil of spring along which a longitudinal wave is moving. (a) (c) (d) Explain longitudinal wave. wave where the particles move in a direction parallel to the direction of wave motion.. [1] efine wavelength. wavelength is the distance between two particles in phase OR istance between two successive compressions, rarefactions. [1] Mark on the diagram above a distance equal to the wavelength of the wave. [1] Label the diagram with a letter where the coils of the spring are compressed. [1] 12

13 8 The diagram below consists of two parts and. The upper part shows the undisturbed position of air particles at time t 1 while the lower part shows the positions of these air particles at an instant time t 2 when a sound wave passes from right to left. The distance between the air particles during time t 1 is 0.7 m as shown by the equal distance between the lines in the diagram below. 0.7 m (a) escribe what is meant by a compression region. compression region is a region of high air pressure compared to the surrounding air pressure.. [1] t the instant time t 2, which is part of the diagram, mark the centre of a compression with a point and the centre of a rarefaction with a point R in the diagram below. [1] R 0.7 m (c) alculate the wavelength of the sound wave. distance between and R = 6 x 0.7 = 4.2 m wavelength = 2 x 4.2 = 8.4 m [1] [M1] wavelength = m [2] (d) Given that the velocity of the sound wave is 340 m/s, calculate the frequency of the sound wave. Velocity = frequency x wavelength Frequency = velocity/wavelength f = 340/8.4 [M1] = 40 Hz [1] frequency = Hz [2] 13

14 9 The electromagnetic (e.m.) spectrum is normally split into 7 components. Radio Microwave Visible light X-rays Gamma rays (a) Write down the names given to the wave components labeled with and. Infrared ultra-violet : :.. [2] For both component and, write down one of its practical application. R communication; heating; intruder alarm; photography : [1] etection of forgery; sterilization; fluorescent effect; sunbed : [1] 3 x 10 8 m/s (c) Write down the speed of X-rays in m/s. [1] (d) (e) How does the speed of radio waves compare with that of the visible light? They are both the same. [1] escribe how the wavelength of the e.m. spectrum changes as we progress from radio to gamma waves. The wavelength decreases. [1] Section nswer all the questions. Write your answers in the spaces provided on the question paper. 1 Figure below shows an arrow indicating the direction of travel of a wave in a medium. J is a particle of the medium that is in the part of the wave. irection of wave J (a) In the diagrams below, draw arrows to show how the particle J vibrates when the wave is [2] (i) a transverse wave (ii) a longitudinal wave J J 14

15 1 The figures below show the displacement-distance and displacement-time (cont) graphs of a wave. The time axis has the unit of milli-seconds, ms. 0.1 Time/ ms From the figures above, (i) (ii) write down 0.6 amplitude. m [1] 0.05 wavelength of the wave.. m [1] 2.5 period of the wave.. ms [1] find the speed of the wave above in m/s. frequency = 1/T = 1 / (2.5 x 10-3 ) = 400 Hz [1] speed = wavelength x frequency [1] = 0.05 x 400 = 20 m/s [1] Speed = m/s [3] (c) Give one example of each type of transverse and longitudinal wave. Water, light, em waves, etc transverse [1] sound wave longitudinal [1] 15

16 2 n experiment was conducted to investigate the changes in temperature of a liquid as it heated. 50 cm 3 of liquid X was placed in a copper container and was heated steadily for 8 minutes. The outside surface of the copper container was painted dull black. The data are given in the table below. Time / min Temperature / o (a) Plot a graph of temperature against time in the graph paper on the next page and draw a best fit line. [5] From the graph, determine the gradient. Show your workings clearly Gradient = M1 = 5.18 (Range: ) 1 Gradient = [2] (c) (d) onclude from your graph the relationship between speed and time. Temperature has a positive linear relationship with time.. [1] The gradient of the graph is equals to the rate of temperature change for liquid X. If a lid is used to cover the container, compare the size of the gradient of the graph that you would expect with your answer in. Give a reason for your answer. Gradient would be greater than that obtained in [1]. Lid prevents heat loss to the surrounding by convection. [1]. Hence the rate of temperature change would be higher... [2] EN OF PPER 16

17 Labels (x, y axes and units) [1] X-scale [1] Y-scale [1] Plot [1] est Fit line [1] 17

Soft clean eraser Soft pencil (type B or HB is recommended)

*7054857815* ambridge International Examinations ambridge Ordinary Level PHYSIS 5054/12 Paper 1 Multiple hoice May/June 2018 dditional Materials: Multiple hoice nswer Sheet Soft clean eraser Soft pencil