Physical Sciences Grade 12 P1 Gauteng Mock 2015 QP

31-DEC-c@87 23:80 From: ~ GAUTENG PROVINCE CUA EPE IE UAT TASTE REPUBLIC, CaF SOUTH AFRICA GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION 2015 ” 10841 PHYSICAL SCIENCES: PHYSICS FIRST PAPER MARKS: 150 TIME: 3 hours 18 pages and 3 data sheets PHYSICAL SCIENCES: Papar NUN 41E X1@ TN P.ivet P70,

seers "Downloaded From hlayiSo°cont’ P.ered PHYSICAL SCIENCES: PHYSICS (First Paper) 10841/15 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION — 2015 PHYSICAL SCIENCES: PHYSICS (First Paper) TIME: 3 hours MARKS: 150 INSTRUCTIONS AND INFORMATION 1. 2. 10. 11. 12. Write your name on the ANSWER BOOK provided. The question paper consists of TWELVE questions. Answer ALL the questions in the ANSWER BOOK provided. Start EACH question on a NEW page. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line between subsections, for example between QUESTION 2.1 and QUESTION 2.2, You may use a non-programmable calculator. You may use appropriate mathematical instruments. You are advised to use the attached DATA SHEETS. Show the formulae and substitutions in ALL calculations. Round off your final numerical answers to TWO decimal places. Give brief motivations, discussions, et cetera where required, Write neatly and legibly. P,T.O.

P.3et wesc 2 "Downloaded from hlayiSo-cor? PHYSICAL SCIENCES: PHYSICS 3 (First Paper) 1084115 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided:as possible answers to the follewing questions, Each question has only ONE correct answer. Write Only.the letter (A—-D) next to the question number (1.1-1.10) in the ANSWER BOOK, for example 1.11 D. 1.1 An object is free failing towards the surface of the earth. Which ONE of the following best describes the direction of acceleration of the object? A . The acceleration. is 9,8 m-s® downward. B The acceleration is 98 m-s* upward, CG The accelération is less than 9,8 m-s® downward: D - The acceleration is tess than 9,8 m-s* upward. (2) 1.2 A1kgmass has‘a constant acceleration. Which ONE of the following sketch graphs correctly shows the retationship between the net force, Fre and acceleration, a? A B Fret a” Fret reso ee a a Cc D Fret F, net pe tn a a (2) P.T.Q.

31-DEC-20a7 23:08 "YY ownloaded*fForh hlayiSo°C6ri" P.4-ea1 PHYSICAL SCIENCES: PHYSICS 4 (First Paper) 10841/15 1.3 Two objects, each of mass m are placed a distance d apart as shown below. The gravitational foreé between: them is F . (") d (») The magnitude of the force increases to 4F when the ... A_ distance between the objects decreased to ia. B . distance between the objects decreased to 5d. C mass ofeach object decreased to : m. D mass of each object increased to 4m. (2) 14 A. car has an initial momentum of 5 000 kgs” easl. The vector below shows the initial momentum of the car, N pi = 6 000 kg-m:s™ | This caris involved in-a collision and the change in momentum of the car is represented below, N Ap = 2.000 kg-m-s” —_. The vector representing the final: momentum of the car after the collision Pi = 3.000 kg-ms A +> B pr = 3 000 kg-m-s™ — C Pr = 8 000 kg-m-s"! . D oo Pr = 8000 kg-m-s7 ° (2) P.T.O,

31-DEC-20a7 23:08 "Downloaded from hlayiS0:c6r"’ P.Svel PHYSICAL SCIENCES: PHYSICS (First Paper) 10841/15 1.5 The graph bélow shows the: relationship between the applied force (F) on an object and the displacement (x) of the object in the direction of the applied force. Force [N} 4x displacement (m) ‘ The average work in joules; done by the applied force for a displacement of 4x mis... A x B 2x CG 3x D 4x (2) P.T.O.

Si-DEC-2887 25:81 Fr ownloaded fram hlayi8o°cBrr 1.6 P.6-e21 PHYSICAL SCIENCES: PHYSICS 6 (First Paper) 10841/15 Study the following absorption spectra for three different.stars as observed from earth. : Red Star X Red Star Y fi tah | ; Blue Red Star Z Which ONE of thie follawing combinations correctly describes the speed of the stars relative.to earth? Star moving away fram earth | Star moving towards earth at . at the greatest speed the greatest speed A ¥Y. 4 B Y x Cc Z Y D Zz x (2) P.T.O.

P.?¢ed rere ==""Downloaded From hlayiSo-cSrr PHYSICAL SCIENCES: PHYSICS 7 (First Paper) 10841/15 1.7 Sphere A, with a charge of +Q, and sphere B, with a charge of +2Q, are suspended from the same insulated point.as shown’ in the diagram below. (The diagram is ‘not drawn to scale.) A B +0 +20 mo. The spheres‘are allowed to move freely until they come to rest on their own, How will the values of the angles « and compare to each other once the spheres come to rest? A a=8 B a<p C usp D a=B=0 (2) P.T.O.

soso 2"Downloaded from hlayiSo:cor* 1.8 1.9 1.10 P.8-ei PHYSICAL SCIENCES: PHYSICS 8 (First Paper) 10841/15 The diagram below shows part of-a circuit diagram. R, and Rp are identical ohmic resistors connected in parallel, With the switch open, the ammeter reads 1 A and the voltmeter across the parallel section reads 3 V: I fa) TE es () — (v) are Switch 8 is closed. The reading on the ammeter and voltmeter will now be ... Reading on ammeter Reading on voltmeter fA greater than 1A 7 greater than.3 V B less than 1A equal to 6 V CG greater than 1A , less than 3V D equal to 1A “equalto3 Vo | (2) Which ONE of the following phrases correctly explains how a generator works? It works ... A _ by converting electrical energy to mechanical energy. B by using the motor effect. C according to Lenz’s law. D using electromagnetic induction. (2) When an excited. electron moves from a higher energy level to a lower energy level a specific ... A emission line in-an emission spectrum is observed, B absorption line in.an emission spectrum is observed. CG emission line in an absorption spectrum is observed. D absorption line in an absorption spectrum is observed. (2) [20] P.T.Q.

31-DEC-2887 23:83 "DY ownloaded from hlayiSorconr P.oved PHYSICAL SCIENCES: PHYSICS 9 (First Paper) 10841/15 QUESTION 2 (Start on.anew page.) Block A of mass 5 kg is attached to block B Of unknown mass. The string Joining the blocks is INELASTIC and WEIGHTLESS. The string passes over a frictionless pulley as shown below, Rough horizontal surface (plane) An applied force F with magnitude 15'N acts at an angle of 30° relative to the horizontal plane on block A. Block A accelerates at 2,2 m-s* to the night across the rough horizontal plane. : The coefficient of kinetic friction.betweén the surface of block A and the plane is 0,35. 2.1 Define Newton's Second Law in words. (2) 2.2 Draw a labelled FREE BODY diagrarn of all the forces acting on block A. (5) 23 Calculate the magnitude of the frictional force experienced by block A. (3) 2.4 Calculate the mass of block B. ti P,T.O.

S1-DEC-2887 23:64 From: Downloaded from hlayiS6 COM P.ie-et PHYSICAL SCIENCES: PHYSICS 10 (First Paper) 10841/15 QUESTION 3 (Start on a new page.) The velocity~ time sketch graph for a ball of mass 160 g, thrown vertically upwards with a velocity of 6 m-s™ from a certain height above the ground, is shown below. On the way down the ball. crashes through a thin horizontal glass pane and then continues downward, eventually bouncing on the ground. Ignore all effects of air friction and assume none of the broken pieces of glass sticks to the ball. v (ms) 6 JA 8 ts) 3,2 ms) 3.44 Write down the magnitude and direction of the acceleration of the ball when it reaches position Bas indicated on the graph. (2) 3.2 How many times did the bail bounce on the ground? (1) 3.3 According to the graph, which direction, DOWNWARDS or UPWARDS is taken as the positive direction? (1) 3.4 Calculate the distance between the pane of glass and the initial position from which the ball was thrown. (4) 3.5 Draw a rough position-time graph’ far the motion of the ball. Show the points A to E on the graph. Do not show any displacement or time values on the graph. Take the. initial position of the ball as zero. (5) [13] P.T.O.

sree "Downloaded Frorn hlayiSo:cor? P.iivet PHYSICAL SCIENCES: PHYSICS "1 (First Paper) 10847/15 QUESTION 4 (Start on a new page.) Mars has an average radius of 3 390 ‘km and a mass of 6,39 x 1079 kg. Mars has two moons. 47 State Newton’s Law of Universal Gravitation in words, (2) 4.2 lf the gravitational force exerted by Mars on one of its moons with mass 1,08 x.10"* kg, is 5,71 10'° N, calculate the distance between the centre of thig moon and the surface of Mars. (6) [8] QUESTION 5 (Start on:a new page.) An ice-skater with a mass of 54 kg, is holding a box as part of her act. She skates with a velocity of 0,08 m-s? east. She throws the 1,5 kg box directly away from her with a velocity of 10,2 m-s” east. 5.1 State the principle of conservation of linear momentum. (2) 5.2 Calculate the ice-skater's velocity immediately after throwing the box away from her. (4) 5.3 Calculate the magnitude of the force exerted on the box by the ice-skater if she exerted this force for 1,2 s. (3) [9] P,T.O.

31-DEC-2887 23:85 "Downloaded from hlayiS0°cor? P.ievet PHYSICAL SCIENCES: PHYSICS 12 (First Paper) 10841/15 QUESTION 6 (Start on a new page.) A box of mass 86 kg is accelerating down a surface inclined at 25° to the horizontal. aa Aman applies a force F-upwards parallel to the plane in an attempt to prevent the box from sliding. down the inclined-plane. In spite of the man’s efforts the box is accelerating down the inclined plane. 6.1 6.2 6.3 6.4 6.5 What is a non-conservative:force? (2) The coefficient of kinetic friction (41) between the box and the surface of the plane is 0,22. Prove that the magnitude of the kinetic frictional force is 168,04 N. (2) State the work-energy theorem in words. (2) Draw a labelled FREE BODY diagram of all the forces acting on the box, (4) The box accelerates parallel down the inclined plane for a distance of 0,9 m at 1,54 m-s”, Use'the work-eneray theorem and calculate the work done by the man onthe box, (5) [15] P.T.O.

S1-DEC-2887 23:66 "Downloaded from hlayiSo:cor? P.iaeet PHYSICAL SCIENCES: PHYSICS (First Paper) 10841/15 13 QUESTION. (Start on anew page.) White standing still.near a railroad crossing, a girl hears a train horn in the distance. The horn emits a sound of frequency 430 Hz. The. speed of sound In air is taken as 335 m-s”. 7A State the Doppiar effect. 72 The train is moving-with a constant velocity of 25 m-s'' in a straight line towards the girl.who Is standing still at the crossing. Calculate the wavelength of the sound observed by the girl while the train is approaching her. 7.3 Will the frequency of the sound observed by the train driver be HIGHER, LOWER or THE SAME as that.emitted by the horn of the train? Give reasons for the answer. (2) (6) (3) {11] P.T.O.

31-DEC-2887 23:66 "Downloaded from hlayiS0°cor? P.i4-et PHYSICAL SCIENCES: PHYSICS 14 (First Paper) 1084/15 QUESTION 8 § (Start-on.a new page.): Two identical conducting spheres A.and B with charges of Q. and Q» respectively are placed in fixed positions along the same straight line as shown in the diagram below. Spheres A and B are placed 30cm from each other. Point P is positioned 30 cm to the right of sphere B on the same straight line. The charge on sphere B is positive. The net eléctric field Enet at point P as a result of the two charges Q, and Qp is. towards the right as shown in the diagram below. . [= Enet E, Es 8.1 What is the sign ‘of the charge-on sphere A? Give a reason for the answer. (3) 8.2 The net electric field at point P is 1 600 N-C" to the right and the charge on sphere B has a magnitude of +12 nc. Calculate the magnitude of the charge on sphere A. (7) A proten is placed at point P without changing the chatges and positions of spheres A and B. 8.3 Calculate the net electrostatic force experlenced by the proton. (4) [15] P.T.G.

S1-DEC-2887 23:66 "Downloaded from hlayiS6:cor? P.isvet PHYSICAL SCIENCES: PHYSICS 15 (First Paper) 10841/15 QUESTION 9. (Start. on'a new. page.) Learners investigate how ‘a’ CHANGE IN THE TOTAL CURRENT of the circuit affects the INTERNAL RESISTANCE OF A CELL. Two groups of learners were given the following apparatus: GROUP A GROUP B » Anew AAA cell * Anew AAA cell with a higher internal « Voltmeter resistance than for group A. « Ammeter + Voltmeter « Rheostat « Ammeter | He * Switch * Rheostat * Connecting wires « Switch « Connecting wires | 94 Write down the independent variable for the investigation. (1) 92 Refer to the apparatus provided to the learners and draw the appropriate circuit diagram required for the investigation. (3) Group. A use their réadings to draw the following graph. Vito 104: f P.T.0.

S1-DEC-2e8? 23:88 Fr" ownloaded from hlayi8a:cor? 9.3 9.4 P.ié-et PHYSICAL SCIENCES: PHYSICS 46 (First Paper) 1OB41/15 Use the graph and determing.the internal resistance of the AAA cell provided to group A. ; (3) The AAA cell provided to group B has a higher internal resistance. How will the gradient of the graph drawn by group B compare to that of group A? Write only GREATER THAN, SMALLER THAN or THE SAME AS. (1) [8] QUESTION 10 (Start on a new page.) The.diagram below shows the circuit for an electri¢ blanket. It has three different resistance settings A, B and C to regulate the amount of HEAT generated by the blanket. 3 A 3,79 77340 r—l || 8D Cc Ra The electric blanket is connected to a battery with an emf of 20 V and an internal resistance of 1.0. 10.1 With the switch connected to position A, calculate the: 10.1.1 Total resistance of the external circuit. (2) 10.1.2 Total current through the circuit. (3) 10.2 How does the total current change when the switch. is connected to position B? Write INCREASES, DECREASES or STAYS THE SAME. Explain the answer. : (3) 10.3 Calculate the power.output of the electric blanket when the switch is connected to C given that the total current at this setting is 2,31 A. (4) [12] P.T.O,

S1-DEC-2@87 23:89 "Downloaded from hlayiSo:cor P.lrvei PHYSICAL SCIENCES: PHYSICS 17 | (First Paper) 10841/15 QUESTION 11 (Start on a new page.) A learner built the foliowirig simple generator based on a dynamo used to power bicycle | headlights. He used the gerierator to demonstrate that he could use mechanical energy i to generate electrical energy. Wheel/Crank BV globe Soft iron. core Copper coil Rotating magnet. WA Is this a DC or an AG generator? Give a reason for the answer. (3) 11.2 How will the learmer know that electrical energy is produced? q) 11.3 Explain how this generatoris able to produce electrical current when there is no electrical Connection between the rotating magnet and the copper coil. (3) 41.4 List TWO changes that canbe made to the generator to INCREASE the BRIGHTNESS of the globe. (2) A generator (dynamo) used to power. a light on a bicycle needs an average power of 6 W and a potential difference of 12 Vins . 11.5 Calculate thé maximum current that can flow through the globe. (4) [13] P.T.O.

QUESTION 12 (Start ona new page:) S1-DEC-2e87 23:18 F°" ownloaded from hlayi8o:cor? P.ie-et PHYSICAL SCIENCES: PHYSICS 10841/15 18 (First Paper) During the investigation ofa specific type of cathode of a photoelectric cell, radiation with different wavelengths were used and the following results were obtained, The graph below was drawn using the results. Wavelength (nm) Maximum kinetic energy (J) 250 0,401x 10°” 215 1,73.% 10" 187 3,04%.10° 167 4,37«.107° 150 5,70x 107? A A (nm) 300-5 200- EK) 150-4 1004 > oO 9 4 6 12.1 Define the work function for a specific metal. 12.2 What is the relationship between the wavelength of the radiation and the maximum kinetic energy of the photoelectron? Explain the answer. 12.3 How does an increase in the intensity of the radiation affect the maximum kinetic energy of the photoelectrons? Write only INCREASES, DECREASES or STAYS THE SAME. 12.4 this cathode is 255:nm. The maximum wavelength for the radiation that is able to emit electrons from Calculate the maximum velocity of a photoelectron emitted if radiation with a wavelength of 160 nm is used. TOTAL: (x07) Ek max (J) (2) (5) [12] 150 P.T.O.

31-DEC-2007 23:18 "Downloaded from hlayiSo°corn P.19ve24 (First Paper) PHYSICAL SCIENCES: PHYSICS 1084415 19 DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VAAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES Radius van die aarde NAMEWNAAM SYMBOL/SIMBOOL VALUE/WAARDE Masse ven die aarde. M 5,98 x 10°" kg Radius of earth Ae 6,38 x 4 ofm P.T.O.

' S1-DEC-2887 23:11 "Downloaded from hlayi8o°cor? P.ceeet PHYSICAL SCIENCES: PHYSICS (First Paper) 10841/15 20 TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING Ax =v,At+aAt® or/of Ay = v,At+ daat® 2 v/s v7 -b2aax otlof v," =v" 2aay ax=(“%2*" Jat onot ay =[% "Jat FORGE/KRAG Fret = Pa p=mv foe se NN f, = 1, Fig At =Ap wom Ap= mv, ~mv, omg mm cy mM M M F=G e ovlof F-G—- ; g=G-5 orfof 9-65 WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W =FAxcosé U=mgh orfof E,=mgh 2 1 1 K= 3 im orfof .~ B, =5 mv? Woe, = AK oof W.,,, = AE, AK=K,-—K,; orfof AE, =E, -E, W,, = AK +AU or/of, W,, = AE, + AE, pa Al Pave ™ FV ave t Poem = Fy gem WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG vata t=! f Viv, Viiv c f= Let f, = f = =h— L viv, ° L viv,” E=hf orfof E ny E=WotEny Ofof. E=W,+K,,, where/waar E=hf and/en W, =hf, and/en Ey. = Vg orfof K =hmvg ata, max P.T.0.

S1-DEC-e087 23:12 "Downloaded fron hlayi8ocort P.eivet (First Paper) PHYSICAL SCIENCES: PHYSICS 10841/15 21 ELECTROSTATICS/ELEKTROSTATIKA F _kQ,Q, r? V= n= alOlots or/ot Q n= ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE emf (£) = I(R +f) Raw I emk (¢)=(R +1) R, =Ry+Re + tli, q= lat R, AR, R, W=vVq pW Bt W=VIAt w= Rat PeVi ; p=PR W- VFAt _vt i “R. Pave = Vine! ems / Poem = Voge Tan Pave = Tins / Pos = Trae R z ve Pave = Nive / Poem = =a R R END