Final Practice Exam Answer Key - Province Of Manitoba

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Grade 11 Physics (30s)Final Practice examanswer Key

Grade 11 Physics (30s)Final Practice ExamAnswer KeyInstructionsThe final exam will be weighted as follows:Modules 1–615–20%Modules 7–1080–85%The format of the examination will be as follows:Part a: Multiple choice40 x 1 40 marksPart B: short explanations5 x 3 15 marksPart c: diagrams15 marksPart d: Problems1 x 6 6 marksPart e: Problems4 x 6 24 marksThe following instructions are meant to assist you when you are writing your finalexamination.nshow your work for the problems.ninclude directions with all vector answers.nround off answers to the correct number of significant digits.Final Practice exam answer Key3 of 41

Part a: Multiple choice (40 x 1 40 Marks)Circle the letter of the choice that best completes each statement.1. Those two quantities that are vectors area) acceleration and electric chargeb) mass and gravitational fieldc) force and velocityd) speed and time intervalAnswer (c)Outcome S3P-3-01, S3P-4-19, S3P-4-01, S3P-4-03, S3P-4-04, S3P-3-032. An object moves to the right 10.0 m from the starting point in a time of 1.0 s, then to theleft 20.0 m in a time of 3.0 s, and then to the right 5.0 m in a time of 1.0 s. The diagrambelow represents this motion.reference pointlll20.0 m10.0 ml5.0 mThe average speed of the object over the whole time interval is best written asa) –1.2 m/sb) 0.8 m/sc) 1.2 m/sAnswer (d)d) 7.0 m/sOutcome S3P-3-014 of 41Grade 11 Physics

3. The graph below is a velocity-time graph for the motion of an object.Velocity-Time Graph20.0Velocity (m/s)10.00.0-10.0-20.00.02.04.06.0Time (s)8.010.012.0The acceleration of this object isa) –2.0 m/s2b) –1.0 m/s2c) 1.0 m/s2Answer (b)a) 2.0 m/s2Outcome S3P-3-044. If an object is already moving and the sum of all the vector forces on a mass is zero, thenthe object willa) move at a constant speed in a straight lineb) accelerate at a constant rate in a straight linec) come to restAnswer (a)d) increase its amount of inertiaOutcome S3P-3-115. Two forces are acting on a 5.00 kg mass. One of the forces is 10.0 N south and the other is15.0 N east. The magnitude of the acceleration of the mass isa) 3.60 m/s2b) 5.00 m/s2c) 18.0 m/s2d) 25.0m/s2Answer (a)Outcome S3P.3.11Final Practice exam answer Key5 of 41

6. The factors, both of which will increase the magnetic field strength of an electromagnet,area) increased electrical current and fewer coils of wireb) increased diameter of coil and an increase in the number of coilsc) an increase in the electrical current and using a strong ferromagnetic material likeirond) using an air core instead of iron and increasing the diameter of the coilAnswer (c)Outcome S3P-4-247. On Mars, the gravitational field strength is 3.7 N/kg. An object has a weight of 98 N onthe earth. The weight of this object on Mars isa) 1.0 x 101 Nb) 37 Nc) 98 NAnswer (b)d) 360 NOutcome S3P-4-048. A 5.0 kg mass is placed in an elevator that is accelerating upwards at 4.0 m/s2. Theapparent weight of this mass isa) 20. Nb) 29 Nc) 49 NAnswer (d)d) 69 NOutcome S3P-4-059. The diagram below shows a wave. The arrow is showing the distance from the top of thewave to the bottom of the wave.This arrow representsa) the amplitudeb) twice the amplitudec) the wavelengthAnswer (b)d) twice the wavelengthOutcome S3P-1-026 of 41Grade 11 Physics

10. A 50.0 kg crate rests on the floor of a warehouse. The coefficient of static friction is 0.750and the coefficient of kinetic friction is 0.450. We want to determine the horizontal force(to the right) required just to start the crate moving. The horizontal force (to the right)required to just get the crate moving along the floor isa) 22.5 Nb) 37.5 Nc) 221 NAnswer (d)d) 368 NOutcome S3P-4-11, S3P-4-1311. The magnetic field isa) strongest near a pole and the direction at any point in space is tangent to the fieldlineb) strongest far from a pole and the direction at any point in space is tangent to the fieldlinec) strongest near a pole and the direction at any point in space is perpendicular to thefield lined) strongest far from a pole and the direction at any point in space is perpendicular tothe field lineAnswer (a)Outcome S3P-4-1712. A standing wave is formed by waves of frequency 256 Hz. The speed of the waves is128 m/s. The distance between the nodes must bea) 2.00 mb) 1.00 mc) 0.500 mAnswer (d)d) 0.250 mOutcome S3P-1-0613. Consider the direction in which the magnetic field lines point for a bar magnet with anorth pole and a south pole. That situation that would give the same pattern of lines isthea) gravitational field line pattern for two neutral massesb) electric field line pattern for two positive chargesc) electric field line pattern for two negative chargesAnswer (d)d) electric field line pattern for two opposite chargesOutcome S3P-4-17Final Practice exam answer Key7 of 41

14. When a wave moves from shallow water to deep water, thea) frequency decreases, the wavelength increases, and the speed increasesb) frequency does not change, the wavelength increases, and the speed increasesc) frequency does not change, the wavelength decreases, and the speed decreasesd) frequency does not change, the wavelength increases, and the speed decreasesAnswer (b)Outcome S3P-1-1115. The definition of magnetic inclination is the angle betweena) magnetic north and geographic northb) magnetic north and geographic southc) the earth’s magnetic field at any point and the verticalAnswer (d)d) the earth’s magnetic field at any point and the horizontalOutcome S3P.4.2016. The following is a sound spectrum created by an instrument playing a certain note.RelativeAmplitude1.00.50.010002000Frequency (Hz)3000If another instrument were to play the same note, thena) the fundamental frequency would be the same, and the number and relative intensityof the harmonics would also be the sameb) the fundamental frequency would be the same, but the number and relative intensityof the harmonics would be differentc) the fundamental frequency would be different, but the number and relative intensityof the harmonics would also be the samed) the fundamental frequency would be different, and the number and relative intensityof the harmonics would also be differentAnswer (b)Outcome S3P-1-17, S3P-1-278 of 41Grade 11 Physics

17. The diagram below shows an electrical current flowing through a straight conductor.The dark arrow shows the electrical current moving to the right. The symbol (I) will beused to represent the electric current.conventional current (I)The symbol B will be used to represent the magnetic field. The diagram that shows thedirection of the magnetic field produced by the current-carrying wire isa)b)c)d)Answer (d)Outcome S3P-4-22Final Practice exam answer Key9 of 41

18. A 15,000 Hz sound wave and a 5,000 Hz sound wave approach a small hole in a wall.The degree of “bending” as the waves move through the holea) depends on the speed of the waveb) is the same for both wavesc) is greater for the 5,000 Hz waveAnswer (c)d) is greater for the 15,000 Hz waveOutcome S3P-1-1419. The frequency of middle C is 256 Hz. The frequency of a C note two octaves belowmiddle C isa) 64 Hzb) 128 Hzc) 252 HzAnswer (a)d) 254 HzOutcome S3P-1-2820. An air column that is solid at one end is used to determine the speed of sound. Thefrequency of an E note tuning fork is 329.6 Hz. The length of the shortest air columnproducing the resonance is 25.0 cm. The speed of the sound must bea) 20.6 m/sb) 82.4 m/sc) 3.30 x 102 m/sd) 3.30 x104m/sAnswer (c)Outcome S3P-1-2221. A pulse on a spring is moving from the right to the left. There is a circle on the rightedge of the pulse.direction of motion of pulseAs the pulse moves to the left, the circle on the right edge of the pulse will movea) to the leftb) to the rightc) upwardsAnswer (d)d) downwardsOutcome S3P-1-0110 of 41Grade 11 Physics

22. If the frequency of a “C” note in the musical scale is 262 Hz, then we can say that thea) period will be the inverse of the frequency and the speed of the wave will be changedb) period will be the inverse of the frequency and the speed of the wave will be constantc) period will be identical to the frequency and the speed of the wave will be changedd) period will be identical to the frequency and the speed of the wave will be constantAnswer (b)Outcome S3P-1-0323. The diagram below shows a longitudinal wave.The horizontal distance indicated with the double arrow showsa) one wavelengthb) twice one wavelengthc) one amplitudeAnswer (a)d) twice one amplitudeOutcome S3P-1-0224. The two pulses shown below are about to pass through each other.When the two pulses interfere with each other, the result isa) a standing wave patternb) destructive interferencec) constructive interferenceAnswer (c)d) a constant nodal pointOutcome S3P-1-06Final Practice exam answer Key11 of 41

25. A string is plucked producing four loops (antinodes). The length of the string is 12.00 m.The wavelength of the wave must bea) 48.0 mb) 24.0 mc) 6.00 mAnswer (c)d) 3.00 mOutcome S3P-1-0626. A ripple tank is shown below.light from sourceglass bottomscreenThe double arrow at the bottom of the diagram indicates the distance between twoa) dark spots and is equivalent to one-half a wavelengthb) dark spots and is equivalent to one full wavelengthc) bright spots and is equivalent to one-half a wavelengthd) bright spots and is equivalent to one full wavelengthAnswer (d)Outcome S3P-1-0812 of 41Grade 11 Physics

27. The diagram below shows an incident wavefront approaching a straight barrier.The diagram that shows the wave ray for the wavefront above isa)b)c)d)Answer (c)Outcome S3P-1-1028. A wave travels at a speed of 10.0 cm/s in shallow water. The wavelength of the wave inthe shallow water is 2.0 cm. The speed of the wave in the deep water is 12.0 cm/s. Thewavelength of the wave in deep water isa) 0.42 cmb) 0.60 cmc) 1.7 cmAnswer (d)d) 2.4 cmOutcome S3P-1-11, S3P-1-12, S3P-1-13Final Practice exam answer Key13 of 41

29. The diagram below shows waves moving from shallow water to deep water.BoundaryDeep WaterShallow WaterFor each of the diagrams below, the dashed line represents a normal and the arrowrepresents the incident wave ray. The diagram showing the correct incident wave rayand angle of incidence for the incident wave ray isa)BoundaryDeep WaterShallow Waterincident wavefronts moving upincident wave rayq1Boundaryb)Shallow Waterincident wavefronts moving upq1Boundaryc)q1Shallow Waterincident wavefronts moving upd)incident wave rayDeep Waterq1incident wave rayDeep WaterBoundaryShallow WaterDeep Waterincident wavefronts moving upAnswer (a)Outcome S3P-1-1114 of 41Grade 11 Physics

30. In the diagram below, the point P is found on the nodal line as shown below in thesquare. The distance PS1 is 10.0 cm and the distance PS2 is 13.0 cm. The distance betweenthe sources is 8.0 cm.PS1S2The wavelength of the waves producing the interference pattern must bea) 0.12 cmb) 2.0 cmc) 3.0 cmAnswer (b)d) 6.0 cmOutcome S3P-1-1631. In a sound wave that moves to the right, a vibrating tuning fork creates a rarefactionwhen the fork movesa) to the right, creating a momentary fall in air pressureb) to the left, creating a momentary fall in air pressurec) to the right, creating a momentary rise in air pressureAnswer (b)d) to the left, creating a momentary rise in air pressureOutcome S3P-1-1732. The sound level in a room may be 50 dB. A sound that is twice as loud as a 50 dB soundisa) 60 dBb) 100 dBc) 500 dBAnswer (a)d) 5000 dBOutcome S3P-1-25Final Practice exam answer Key15 of 41

33. If the frequency of one source of sound is 500 Hz and a second sound source is 504 Hz,then when the two waves interfere with each other, the beat frequency will bea) 2 Hzb) 4 Hzc) 8 HzAnswer (b)d) 16 HzOutcome S3P-1-2034. For a tube closed at one end, the length of the tube at a frequency of 256 Hz will bea) one-quarter the value for a tube open at both endsb) one-half the value for a tube open at both endsc) twice the value for a tube open at both endsAnswer (b)d) four times the value for a tube open at both endsOutcome S3P-1-2035. The frequency of a G note is 384 Hz. Using the table below, the frequency of the B notemust beC4D.E5F.4G6.4ABCD5.56.6.a) 192 Hzb) 307 Hzc) 480 HzAnswer (c)d) 768 HzOutcome S3P-1-2836. A good scientific theory is one which isa) simple (less complex), has a wide scope, and is accurate and consistentb) simple (less complex), narrow in scope, and is accurate and consistentc) more complex, has a wide scope, is accurate and consistentd) more complex, narrow in scope, consistent but not accurateAnswer (a)Outcome S3P-2-0516 of 41Grade 11 Physics

37. When we perform an experiment and form a mental picture without necessarily havinga mathematical relationship, this way of representing the experiment can be described asa) visualb) symbolicc) numericAnswer (a)d) graphicalOutcome S3P-2-0238. Those who proposed the idea that light has wave-like properties werea) Huygens and Newtonb) Huygens and Planckc) Maxwell and PlanckAnswer (d)d) Maxwell and HuygensOutcome S3P-2-0639. At the time of Newton, many scientists tried to produce wave interference effects, butwere not successful. The reason for this is thata) incandescent light sources are out of phase and the wavelength of light is very largeb) incandescent light sources are out of phase and the wavelength is very smallc) incandescent light sources are in phase and the wavelength of light is very larged) incandescent light sources are in phase and the wavelength of light is very smallAnswer (b)Outcome S3P-2-1440. If light moves from left to right along the x-axis, then the electric field line vibrates alonga) the x-axis and the magnetic field also vibrates along the x-axisb) the x-axis and the magnetic field vibrates along the y-axisc) the y-axis and the magnetic field vibrates along the x-axisd) the y-axis and the magnetic field line vibrates along the z-axisAnswer (d)Outcome S3P-2-15Final Practice exam answer Key17 of 41

Part B: short explanations (5 x 3 15 Marks)Answer any five (5) of the following questions. Be sure to indicate clearly which fivequestions are to be marked.Outcome S3P-1-011.Distinguish between transverse waves and longitudinal waves.Answer:Transverse waves are waves in which the direction of motion of the medium isperpendicular to the direction of motion of the disturbance. In longitudinal waves, thedirection of motion of the medium is parallel to the direction of motion of thedisturbance.Outcome S3P-4-232.Using the Domain Theory of Magnetism, explain the following.a) When placed in a strong magnetic field, a bar of iron becomes a bar magnet. Whenthe field is removed, the piece of iron is no longer a bar magnet.Answer:When the bar of iron is placed in a strong magnetic field, the magnetic domainswithin the piece of iron align themselves with the magnetic field. The bar of iron thenacts like a bar magnet. When the magnetic field is removed, the magnetic domainsreturn to their original random arrangement. The piece of iron is no longer a barmagnet.b) Over a period of years, the steel girders in a building become magnetized.Answer:Over a period of years, the magnetic domains within the steel girders alignthemselves with the Earth's magnetic field, thus becoming magnetized.18 of 41Grade 11 Physics

Outcome S3P-1-213.Distinguish among fundamental frequency, overtone, and harmonic for a string of aguitar.Answer:The fundamental frequency of the guitar string is the lowest frequency at which theguitar string can vibrate (for example, 100 Hz).An overtone is a frequency, which is a whole number multiple of the fundamentalfrequency. The first overtone has the frequency of twice the fundamental frequency(200 Hz).A harmonic is a frequency, which is also a whole number multiple of the fundamentalfrequency. The first harmonic has a frequency equal to the fundamental frequency(100 Hz).Outcome S3P-2-074.Using a diagram, explain how Newton’s Corpuscular Theory explained refraction.Answer:Newton used two level surfaces, one slightly higher than the other, with a ramp joiningthe higher surface to the lower surface. As a particle rolled across the upper surface, ittravelled in a straight-line path like light does in a uniform medium. When the particlereached the ramp or sloping surface, it received a pull from gravity, changing thedirection of its path. This change in direction corresponded to refraction. On the lowerlevel, the particle again travelled in a straight line.Upper surfaceSloping surfaceLower surfaceqiqrThe path of the ball bendstowards the normal.Final Practice exam answer Key19 of 41

Outcome S3P-1-275.Distinguish between the pitch, the intensity, and the quality of sound produced by amusical instrument.Answer:Pitch refers to the frequency of the sound. A sound with a high frequency has a highpitch.Intensity of sound refers to the energy carried by the sound and is most closely linked tothe amplitude of the sound waves.The quality of the sound refers to the complexity of the sound wave. The more complexthe sound wave, the better the quality of the sound.Outcome S3P-1-056.A wave crest is travelling along a heavy medium. The wave crest encounters a junctionbetween the heavy medium and a light medium. Using a sketch, describe the situationafter the wave crest has passed through the junction.Here is a diagram of the situation before the crest hits the junction.Slowermediumincident pulseFastermediumAnswer:The diagram below is how the medium would appear a short while after the incidentpulse has hit the boundary. The reflected pulse and the transmitted pulse are bothshown.transmitted pulseSlowermediumreflected pulseFastermediumAgain, there are several details to make note of:Reflected PulseTransmitted PulseReturns as a crest—reflected uprightfrom a free endTransmitted as a crestSmaller in amplitude—energy istransmittedLarger in amplitude—light to medium iseasier to moveSame length as original crest—speed isthe sameLonger in length than the original crest—speed is larger in the transmitted sectionCloser to the boundaryFarther from the boundary since the crestis moving more quickly20 of 41Grade 11 Physics

Outcome S3P-2-10, S3P-2-117.Describe two phenomena for the behaviour of light that are explained better using thewave model of light than the particle model of light.Answer:1. RefractionThe particle model predicts that particles of light will speed up as they pass throughthe boundary between air and water. The wave model correctly predicts that lightwill slow down as it passes through the boundary between air and water.2. Partial reflection and partial refractionThe particle model could not fully explain why some particles would reflect off theboundary between two media and some particles would be transmitted through theboundary. The wave model of light demonstrates that waves incident on to theboundary between two media can partially be reflected and partially be transmitted.Final Practice exam answer Key21 of 41

Part c: diagrams (15 Marks)Show your work in the space provided.Outcome S3P-1-061.Draw the resultant wave. (4 marks)Point12345678910Displacement toTop Wave (cm)00.40.91.31.61.92.01.91.81.5Displacement toBottom Wave .8–0.4–0.1Answer:1ll l l2 3 4 5l 6 7 8 9 10l l l l l l l l ll l22 of 41llGrade 11 PhysicsllTotal .11.41.4

Outcome S3P-1-102.A point source on a ripple tank is located 3.5 cm from a straight barrier. Draw in, using acompass, the circular wave after it has travelled 5.0 cm. Locate the source of the reflectedwavefront and draw in the reflected wavefront. Indicate the direction of travel of boththe incident and reflected wavefronts. (3 marks)BarrierAnswer:Original Wavefront3.5 cmSourceWave raysReflected WavefrontFinal Practice exam answer Key23 of 41

Outcome S3P-1-103.The diagram below shows a wavefront travelling towards a straight barrier. Draw inand label the di

Final Practice exam answer Key 3 of 41 Grade 11 P hysics (30s) Fi a P acˇice E a A ˆe Ke I c i The final exam will be weighted as follows: Modules 1 –6 15 –20%

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