Physical Sciences Grade 12 P1 Limpopo November 2017 QP

Downloaded from hlayiso.com NATIONAL Co ialaalalahedeahehataladialeladaiahlabsialalaleielelelaleldalsbstlelaidelatalattstala lt PHYSICAL SCIENCES: PHYSICS (P41) SEPTEMBER 2017 SRSSSS RTM ESR HERR ERee e MARKS: 150 TIME: 3 hours gmeee ee This question paper consists of 19 pages and 3 data sheets.

Downloaded from hlayiso.com Physical Science‘? 2 LimpopoDot/September 2017 INSTRUCTION AND INFORMATION 4. Write your NAME in the appropriate space on the ANSWER BOOK. 2. This question paper consists of TEN (10) questions. Answer ALL questions in the ANSWER BOOK. : 3. Start EACH question on a NEW page in the ANSWER BOOK, 4. Number the answers correctly according to the nurnbering system used in this quesiion paper. 5. Leave ONE line between two sub-questions, for example between QUESTION 2.1 and QUESTION 2.2. You may use a non-programmabie calculator. You may use appropriate mathematical instruments. ‘You ate advised to use the altached DATA SHEETS. Show ALL formulae and substitutions in ALL calculations. 16. Round off your final numerical answers to a minimum of TWO decimal places. 11. Give brief motivations, discussions, et cetera where raquited. 12. Write neatty and legibly. 2s Ss MN Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Science 3 LimpopeDoE/September 2017 NSC QUESTION 4: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Write down the question number (1.1-1.10), choose the answer and make a cross (%) over the letter (A-D) of your choice in the ANSWER BOOK, EXAMPLE: 414 A CesT ¢ Tay 1.4 According to Newton's law of universal gravitation, the gravitational force of attraction that two bodies exert on each other is directly proportional to the ... ‘A product of their masses and inversely proportional to the distance between their cantres, 6B square of the distance between their centres and inversely proportional to the product of their masses. © product of their masses and inversely proportional to the square of the distance between their centres. D total mass and inversely proportional to the square of the distance between their centres. {2} 1.2 Which ONE of the following expressions gives a physical quantity that is a measure of the INERTIA of a body? A wemg B p= rv c Fog At = mMAV BD m = fpet. @) Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Science/P1 4 LimpopoDoE/Septeniber 2017 NSC 1.3 Aball is thrown vertically upwards. Which ONE of the following graphs BEST represents the net force (Fro) exerted on the ball against time (f) while the ball is in the air? ignore the effects of air resistance. A 8 t t c D FY Frat Fret La ntnenaonncinininsiniacninainninnns t t ; : @) 14 in the equation Fre Ot = Ap, the product Fier At represants ... A force per unit time. B inertia of the body. Cs impuise of the force. DE tate of change in momentum. _ @ fre

Downloaded from hlayiso.com Physical Science/P 4 § LimpopoDobySeptember 2017 18 Lé 47 NSG For a body falling from a GREAT height in the absence of air resistance, which ONE of the following statements regarding kinetic energy (Ex) and gravitational potential eneray (E,) is TRUE at ALL points of the motion? A E,~ Ex = constant B £,+&, = constant C Exis equal to Ep D Eis less than Ey @) An astronomer observes certain spectral fines obtained from tight from a bright star. The spectral line of one particular colour is found to have shifted towards the blue end of the visible spectrum. This suggested that the star is ... A stationary relative to earth. B moving away from the earth. C moving towards the earth. Apoint charge Qh carrying a charge of -q is close to another point charge Q, carrying 4 charge of +2q. @E- «© If the magnitude of the electrostatic force that Q; exerts on Qy is F, then the electrostatic force that Q exerts on Q; is ... F directed towards Qo. F directed towards Q;. 2F directed towards Qo. (2) oOo © } 2F directed towards Q4. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical SciencalP'4 8 LimpopoDoE/September 2017 NSC 1.8 The three resistors R1, R2 and Ri, in the circuit diagram below are identical. They are connected in series to a cell of ernf ¥ and negligible intemal resistance. I Ry rn} I Vf the potential difference across R1 is %V, then the potential difference across R2 will be ... A ONY. BMW. Gc OY. D aM Q) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Science/P4 ? LimpopoDoE/September 2017 NSC 1.8 Asimple AC generator produces a voltage (V) which varies with time ({), as shown in the diagram below. ¥ Which ONE of the following graphs shows how the voltage varies with time when the speed of rotation is halved? A A 8 h Vv Bhennegennee © f \ Se er Ty 234 4 fi 12 3 4 t ¥ ¥ 6 D * ry A . ¥ @) Copyright reserved Piaase turn over

Downloaded from hlayiso.com Physical Science’ LimpopoDoE/September 2017 8 NSC 4.40 The energy level diagram for an elernent is shown In the diagram below. E, Ground State The electron tranaiton from Ez to Es corresponds f @ green tne in he The transition Ey to Ey corresponds fo the ... A absorption of red light. B sabsorption of green light. C emission of green light D emission of red light. @) Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Science/P1 a LimpopatioE/September 2017 NSC QUESTION 2 (Start on a new page.) A motor is used to pull a 56 kg block up the incline by means of a light (masstess), inextensible rope, as the diagram below illustrates. t i lem i i + am > : i ‘The coefficient of kinetic friction between the block and the incline Is 0,70. 24 Define the term kinetic frictional force in words. 2.2 Suggest a reasen as to why the coefficient of kinatic friction is dimensionless (has no units). The block moves up the incline at CONSTANT VELOCITY. 2.3. Whatis the numerical value of the RESULTANTNETFORCE, along the incline, on the block as it is being pulled? 2.4 State, in warde, Newton's First Law of Motion. 2.5 Draw a labeled free-body diagram showing ALL the forces acting on the block as it is being pulled up the incline. 2.6 Show, by means of an appropriate calculation, that the tension in the rope is 568,4 N. is) a (2) 4) () [18]

Downloaded from hlayiso.com Physical Science/P1 i] LumpopaDoE/September 2017 NEC QUESTION 3 (Start on a new page) A Physics professor sets up an experiment to determine the height of a building. * In his experiment he found that pufly ball, A, released from the top of a building, X, covers the last 2 m in the air in 0,125 s. tgnore the effects of air tesisiance. wig X(A) Putty Ball U Zz 3.1 State the vatue of the “change in velocity per second’ for the putty (1) ball. 3.2 Determine the: 3.2.1 Height, h, of the building (4) 3.2.2 Time it takes the ball to reach point Z 3 3.3 Sketch a position versus time graph to illustrate the motion of the putty ball from point X to point Z. Use the ground as zero reference. Clearly indicate the following values on the graph: » Height from which the ball was dropped » ‘Time at which the bail strikes the ground B} 3.4 The experiment is repeated using a putty bail B of TWICE the mass af putty bail A. Will the acceleration of ball 8 he GREATER THAN, EQUAL TO or LESS THAN the accaleration of ball A? Give a reason for the {2) answer. [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciente/P4 1 LimpopoDoE/September 2017 QUESTION 4 (Start on a now page) in a Physics laboratory, a trolley of unknown mass, m, moves along a track at a constant velocity of 0,4 ma, A wooden block, mass 500 g, is released directly above and it lands on top of the trolley. The trolley, along with the block, continues moving at 0,15 mre" in the same direction, a8 the diagram below illustrates. Block (| vi a | BEFORE | AFTER 41 Define, in words, the term momentum as used in Physics, @) 42 is the collision between the wooden block and the trolley ELASTIC or INELASTIC? Use a suitable calculation to justify the answer. & 43 Draw a velocity versus time sketch graph to illustrate the motion of the trolley BEFORE and AFTER the block fands on it.(aa values @) required). 110 Copyright reserved Please turn over

~ Downloaded from hlayiso.com Physical Sclence/P i 42 LimpopoioE/Septamber 2017 NSC QUESTION 6 (Start on a new page) Blocks A and B in the diagram below are connected by a light (massiess), inextensible string passing over a light, frictiontess pulley. Ground Block B is released from rest ata height of 4,0 m abave the ground. ignore the effects of air resistance. 5.1 Draw a labeled free-body diagram for block B indicating ALL the forces acting on it as it moves downwards. @) 5.2 State the NAME of the conservative force acting on block A while moving upwards. 7 53 State, in words, the work- energy ireorem. Q) 5.4 Using the work-energy theorem, show that block Ef hits the ground at a speed of 8, 797 mvs. rea) 5.5 Calculate the time it takes biock A to travel 4,0 m upwards. (3y 115) Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Sclencaf?+ ms LimpopoDoE/September 2017 QUESTION 6 {Start on a new page) Accar sounds its horn as ittravels at a steady speed of 18 ms” along 4 straight road between two stationary observers, X and Y. Observer X hears a frequency of 538 Hz whilst observer Y hears a lower frequency. - The phenomenon observed by X and Y is called the Doppler Effect. Take the speed of sound in air as 340 mvs. 61 State ONE condition necessary for the Doppler Effect wave phenomenon fo be observed. (ty 6.2 Is the car travelling TOWARDS X or TOWARDS Y? Explain the answer by referring to speed of sound, wavelength and frequency. (4) 63 Calculate the: 6.3.1 Frequency of the car's hom 4} 6.3.2 Frequency heard by ¥ as the car travels at 15 ms". 4) 64 State ONE application of the Doppler Effect in the medical field. (1) [4] Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Science/P1 44 LimpopoDob/September 2017 QUESTION 7 (Start on a new page) 7A The diagram below shows Q; with a charge of +1,0 x 10° C placed 40 om from a charge Q2 with a charge of +2,0 x 10°. x a _--3- ‘< 10. em 2 7.1.1 State Coulomb’s Law of electrostatics in words. (2) 7.1.2 The net electrostatic force exerted on an electron placed at point X is zero newton, Calculate the distance (in cm) between Q, and point 4. (8) 72 Mis 2 positive point charge. 7.2.1 Sketoh the electric field pattern caused by M. @) P and T are two points some distance to the right of M. The distance between P and T is 3 mim, as the sketch below illustrates. The magnitudes of the electric field at points P and T ie 4,0 x 10° N-C” 1 and 2, 8x 10° NG" respectively. @) 722 Define, in words, the term electric feld at a point. 7.2.3 Calculate the magnitude of the charge on M. ch Copyright reserved Piewse turn over

Downloaded from hlayiso.com Physical Science/P4 18 LimpopoDol/September 2017 NSC QUESTION 8 (Start on a new page) 8.4 A customer with a prepaid meter buys 180 KW.h for R 261 (including VAT) at the shop. Calculate the cost of electricity for the customer to run a 420 We television set for 4 hours a day for 30 days. @ &2 A holidaymaker sets up a circuit in her caravan. She uses two 12 volt car batteries of unknown intemal resistance and connects a hot plate (HP) of resistance 9,6. in parallel with two identical light buibs, A and B, as illustrated in the circuit diagram below. The resistance of the connecting wires is negligible. . HP 1960 A A B —_— The graph below shows the potential difference across the terminals of the battery BEFORE and AFTER awitch 3; is closed. Switch S; is closed after t seconds while switch S2 remains open. = 8 3 i Time (s} 8.2.1 Define the term enif of the battery 2) 822 Refer to the graph and write down the value of P. (1) Copyright raserved Pigase tum over

Downloaded from hlayiso.com Physiktal Science/P4 nee LinspopoDok/September 2017 WITH ONLY SWITCH S, CLOSED, calculate the: 82.3 Current through the hot plate Q) 82.4 — Internal resistance, r, of the batiery @) BOTH SWITCHES, S; and S;, ARE NOW CLOSED and the battery delivers a current of 8 A during this period. 8.2.5 Calculate the resistance of light bulb A. 4) 82.8 How will the voltmeter reading be affected if the hot plate burns out? Write dewn only INCREASES, DECREASES or REMAINS THE SAME. Provide a reason for the answer. 3) 20]

Downloaded from hlayiso.com Physical Science/P4 47 LimpopoloE/September 2017 NSC QUESTION 9 (Start on a new page) Grade 42 learners investigate a factor which affects the current induced in an altemator (AC generator). They use a hand-operated alternator consisting of a handle, which rotates an armature of conducting coils. The alternator is connected to a sensitive ammeter and a smaill light bulb, as shown in the simplified diagram below. Handle _# 9.1 Write down the following: 9.1.1 The NAME of component X 9.1.2 The function of component ¥ a) 8.2 As the handle is tumed the fight bulb flickers and the ammeter needle fluctuates from left to right, Suggest a reason for this () a3 State the energy conversion that takes place when the akernator is in operation. 0) The results obtained ara shown in the table below. TRIALS | SPEED OF ROTATION OF THE | MAXHAUM ARMATURE (Cycles per AMMETER second) READING (A) 4 6 021 2 8 6.28 3 10 alt. 4 Formulate a suitable INVESTIGATIVE QUESTION for this Q) 95 Wate down a suitable conclusion that can be drawn from the results obtained. 4) 96 Write down the fundamental principle on which altemators operate. (1)

Downloaded from hlayiso.com Physical Science/P1 cid LimpopaDoESeptember 2077 NSC 9.7 Refer to TRIAL 3 and calculate the root mean square value of the voltage which is induced across the fight bulb when the average power dissipated in the bulb is 1,5 W. QUESTION 10 (Start on a new page} Some Physics leamers conduct an investigation into the relationship between the maximum kinetic energy (Exmm) and the frequency of the incident light falling on the cathode of a photo-electric cell, The apparatus shown below is used in the investigation. Ke ()— The maximum kinetic energy of the ejected photoelectrons versus the frequency of the incident light is plotted, as shown in the graph below. Incident light ed mmo — ed * ‘ t + fo fy Frequency (Hz) 10.1 For this investigation, write down the INDEPENDENT variable. i) 10.2 Name the frequency, f,, shown on the graph. () The work function of the metal used as cathode is 6,08634 x 10° J. 10.3 Define, in words, the term work function of a metal. @) 10.4 Calculate the frequency, f;, shown on the graph. 3) Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Science/P1 19 LimpopaDob/September 2017 NSC 10.5 Draw a sketch graph of the maximum kinetic energy of the photoelectrons versus the intensity of the incident light (wo values = (2) nesded), 405 is It possible for a photoelectron ejected by the incident light to have the SAME energy as the photon of the incident light? State only YES or NO. Fully expiain the answer. (4) 113} TOTAL: 160 Copyright reserved Please tum over