Physical Sciences Grade 12 P1 Gauteng Mock 2019 QP (Eng)

Downloaded from hlayiso.com BEB SS, GAUTENG PROVINCE EDUCANGN REPUBLIC GF SOUTH AFRICA GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION 2019 | PHYSICAL SCIENCES: PHYSICS PAPER 1 TIME: 3 hours MARKS: 150 19 pages + 3 information sheets PHYSICAL SCIENCES: Paper 1 AI 10841E X10 LD P.T.O. .

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 2 (Paper 1) 10841 / 19 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION PHYSICAL SCIENCES: PHYSICS (Paper 1) TIME: 3 hours MARKS: 150 INSTRUCTIONS AND INFORMATION 1. 2. 10. 411. 12. Write your name in the appropriate space on the ANSWER BOOK. This question paper consists of 11 questions. Answer ALL the questions in the ANSWER BOOK. Start the answer to each question on a NEW page. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line open between sub-questions, 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 ALL formulae and substitutions in ALL calculations. Round-off your final numerical answers to a minimum of TWO decimai places. Give brief discussions, et cetera where required. Write neatly and legibly. P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 3 (Paper 1) 10841 /19 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are given as possible answers to the following 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. 1.1. Aleamer is sitting on a chair. According to Newton's Third Law of Motion, the reaction force to the leamer’s weight, w is the force of the ... A B Cc D learner on the chair. chair on the leamer. -” earth on the learner. learner on the earth. (2) 4.2 Two objects, A and B, are in contact with each other on an inclined plane. A horizontal force, F, is applied parallel to the incline, and pushes on the objects as shown in the diagram below. re The magnitude of kinetic frictional force acting on the objects cannot be ignored. Which ONE of the following is the correct free body diagram for block A? A Fx F By F Fr Fg Fa Fx F D Fn F Fors Fr Fy L Fr Fy Fg (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 4 (Paper 1) 10841 / 19 1.3 Trolley T, mass 3m, moving to the right with a speed v collides head-on with troliey R, mass m, moving to the left with speed v. Immediately after the collision, trolley R moves to the right with a speed 2v and trolley T is at rest. Refer to the diagram below. Ignore the effects of friction. BEFORE COLLISION AFTER COLLISION Vv v=0 Ve= 2v —_—— > ++ a al fe as ye va Which of the following combinations is CORRECT? MECHANICAL ENERGY MOMENTUM {A _.| Conserved ; Conserved B_[ Conserved Not conserved C_| Not conserved Not conserved D_| Not conserved Conserved (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 5 (Paper 1) 10841 / 19 1.4 Asmall stone is dropped from a height y above the ground as shown in the diagram below. It strikes the ground after time t. ground Take UPWARDS AS THE POSITIVE. Ignore the effects of air resistance. Which of the following diagrams shows the correct position-time graph for the motion of the stone? A 4 B + € E *(s) ~ > § t(s) § Cc a ¢ { c + D 4 = € —* £ 8 3S a = a 9 > a t(s) y ¥ M (2) P.T.O.

1.5 1.6 Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 6 (Paper 1) 10841 / 19 A pendulum bob is raised to position A at a height h above the lowest point of its swing, C. It is released from point A, and swings through points B with speed vg and C with speed ve. Ignore frictional effects. What is the relationship between the speed Vp and speed vc? , Ve A Vga =-= V2. B vg = J05v¢ c Vp = 0,5 ve V2 P= (2) An astronomer views the line spectrum from a star. Which of the following describes the effect of the Doppler shift on the line spectrum if the star is moving towards earth? The line spectrum ... appears dimmer. appears larger. is shifted towards the red end of the spectrum. is shifted towards the blue end of the spectrum. (2) GOW>Y P.T.O.

1.7 1.8 Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 7 (Paper 1) 10841 /19 Point charges Q,, Qz and Qs are arranged at the corners of a right-angled triangle, as shown in the diagram below. The charges on Q,, Q2 and Q3 are unknown. The distance between Q, and Qs is r. The distance between Q2 and Qs is also r. Charge Qs; experiences a resultant electrostatic force to the WEST. a ran N Pawan re st we wenn ween enw nel s Qa Q, Which of the following combinations of charges couid be possible for charges Qi, Q» and Q3? Q, Q Qs A NEGATIVE POSITIVE POSITIVE B POSITIVE POSITIVE POSITIVE [ej NEGATIVE NEGATIVE NEGATIVE D POSITIVE NEGATIVE POSITIVE (2) In the circuit diagram below three resistors, Ri, Re and a6 O are connected in series. R, = Rz and the internal resistance of the cell and connecting wires may be ignored. V; reads 18V and V2 reads 12V. | 18V , LR FH Re FL 62 | — () 12 Which of the following is the possible values for Ry and R2? A 4Q B 690 Cc 120 D 180 (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 8 (Paper 1) 10841 / 19 1.9 | The diagram below is a simplified version of an electric generator connected to a light bulb. Component X is either a split ring or slip rings. “) Which ‘of the following options for this generator is correct? Energy conversion Type of current taking place generated Component x A mechanical to electrical slip ring -_ J AC_ B mechanical to electrical split ring . AC Cc electrical to mechanical slip ring Dc : D electrical to mechanical split ring DG (2) 1.10 The diagram below shows some principle lines, P, Q, R and S in the line emission spectrum of helium with corresponding wavelengths in nm. : Q. R s ' i E 5 E E 3 8 8 8 Which ONE of the spectral lines represents the /owest energy change of an electron within a helium atom? DOU> a27OH 7 (2) [20] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (Paper 1) 10841 /19 QUESTION 2 (Start on a new page.) 2.1. A horizontal force Fa of magnitude 20 N is applied to block X, mass 3 kg ona table. Block Y, mass 2 kg, is resting on block X. The two blocks are joined by a thin inextensible string of negligible mass which runs over a frictionless pulley, fixed to the wall. Block X experiences a kinetic frictional force of 1,2 N with the surface of the table. There is no friction between block X and biock Y. The tension in the string is T when block X accelerates to the right. 2.1.1 State Newton’s Second Law of Motion in words. 2.1.2 Drawa labelled, free-body diagram showing ALL the forces acting on block X, , 2.1.3 Calculate the magnitude of the tension T in the string. 2.2 A leamer wants to calculate the distance between the Earth (mass Me = 5,97 x 10% kg) and the Moon (mass My =7,35 x 10”? kg) where the net gravitational force is Zero. To achieve this, the learner placed a third mass ‘m’ at point ‘P’ as shown in the diagram below. The distance between the centres of the Earth and the Moon is ‘r’. 2.2.1 State Newton’s Law of Universal Gravitation in words. 2.2.2 Use the law of gravitation to show that r and x are related by the following equation: r—2rx + 0,988x? = 0 (2) (6) (6) (2) (4) [20} P.T.Q.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (Paper 1) 10841 / 19 10 QUESTION 3 (Start on a new page.) A ball of mass 0,2 kg is dropped vertically from the top of a building to a concrete floor below. The ball bounces off the floor. The velocity versus time graph below shows the motion of the ball. Ignore the effects of air friction. . DOWNWARD MOTION IS TAKEN AS NEGATIVE. vimst) 10-- 75+ sAtcabbenenestsstsananesaceetersarseesoengyers 5-- > time (s) 3.1 Explain the term free fail. Use the graph to answer the following questions. 3.2 Write down the number of times the ball hits the floor. 3.3 Calculate the height: 3.3.1. From which the ball was dropped 3.3.2 Reached by the ball after the first bounce 3.4 Determine the magnitude of the displacement of the ball from the moment it was dropped until time t. (2) (1) (4) (3) (1) [11} P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 14 (Paper 1) 10841 / 19 QUESTION 4 (Start on a new page.) The table below shows how the momentum of a single train coach A changes with time just before and just after a head-on collision with another coach B. p(kg-m-s”') of coach A 30 000 30 000 14 000 14 000 time (s) 20 20,1 20,2 20,3 Coach B has a mass of 9 000 kg and was initially travelling at 1,5 m-s”' west. You may assume that the net external force acting on the system is zero. 4.1. Write down a word / term for the underlined words above. (1) Use the information in the table to answer the following questions. 4.2 Calculate the magnitude of the: 4.2.1 Net average force acting on engine coach A during the collision (4) 4.2.2 Velocity of coach B just after collision (4) 4.3 Redraw the net force vs time graph below in your answer book and complete the graph for coach A. The time values are on the graph. Fret 0 20,1 20,2 203° t(s) (3) {12] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 12 (Paper 1) 10841 / 19 QUESTION 5 (Start on a new page.) 5.1 In an experiment, a rough inclined plane QR has been constructed to stop a moving 5 kg block. The block reaches point Q with a speed 9,90 ms’. The block comes to a stop at point R which is 3 m above level QP. The frictional force between the surface QR and the block is 18N. 5kg 5.1.1 Define a non-conservative force. : (2) 5.1.2, Use energy Principles and calculate the angle @ of slope QR. (7): 4) 5.2 A motor is used to lift a container of water up a vertical shaft with a steel cable. The total mass of the container and the water is 987 kg. The container is lifted from rest from point X and passes point ¥ at a height 46 m. At point ¥ the container has a speed of 0,9 ms". ; You may ignore frictional effects and the mass of the steel cable. i motor Y 46m x container with water 5.2.1 State the work-energy theorem in words. (2) 5.2.2 Use the work-energy theorem to calculate the work done by the motor in lifting the container from paint X to Y. be P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 13 (Paper 1) 10841 / 19 QUESTION 6 (Start on a new page.) An ambulance is travelling at a constant speed along a straight horizontal road with its siren emitting a sound of frequency 800 Hz. A stationary observer standing at point P next to the road, hears the siren frequency of 910 Hz as the ambulance approaches. The ambulance passes point P and continues at the same speed. Take the speed of sound in air to be 340 m-s™. Observer & 6.1 State the Doppler effect. (2) 6.2 Calculate the speed of the ambulance. (5) 6.3 A detector at point P measures the siren’s frequency and the results are shown in the graph below. ER Pl 5 & Ss 2 ire time (5) 6.3.1. Write down frequency R. (1) 6.3.2 Calculate the value of S on the graph. (4) 6.4 What frequency will the observer hear when the ambulance is at point P? (1) [13] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 14 (Paper 1) 10841 / 19 QUESTION 7 (Start on a new page.) 7.1 Point charges - Qy, + Q2 and + Qs are arranged at the corners of a right-angled triangle, as shown in the diagram below. — 15mm —+, -Q)=-2nC } | #Q.=+4nC op 20mm | *#Q3=+5nC * 7.1.1 State Coulomb's law in words. (2) 7.1.2 Draw a force diagram to show the forces acting on charge + Q2 due to charge - Q; and + Q3. (2) 7.1.3 Calculate the magnitude of the net force acting on Q2 due to Q, and Qs if Qi =-2nC, Q2=+4nC and Q; = +5 nc. (5) 7.2 A-—2nC charge is 15 mm to the left of a + 4 nC charge as shown in the diagram below. Point P is 10 mm to the right of the + 4 nC charge. -2nc +40 td 15 mm 2 10mm oP Fal att Calculate the net electric field at point P. (5) [14] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 15 (Paper 1) 10841 / 19 QUESTION 8 (Start on a new page.) A group of learners conduct an experiment to determine the emf (c) and internal resistance (r) of a battery. The data obtained from the experiment is used to plot points on graph paper and draw a line of best fit. The graph of one of the learners is given below. The x and y axes have not been labelled. ry 8.0 ~ r . f ‘ f sees 6.0 r t a i f : 40 20 a 2 ag ci 8.1 Explain the term intemal resistance. (1) 8.2 Write down ONE factor which must be kept constant during this experiment. (1) Using the graph: 8.3 Provide a label for the y-axis. (1) 8.4 Write down the quantity represented by the gradient? (1) 8.5 Write down the emf of the battery. (1) 8.6 Calculate the internal resistance of the battery. (4) 8.7 Determine the value of Vint when the graph reaches 0,8 on the x-axis. (1) [10] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 16 (Paper 1) 10841 /19 QUESTION 9 (Start on a new page.) 9. A circuit is connected as shown below. The battery has an emf of 10 V and an unknown internal resistance r. A voltmeter V; is connected across the battery and another voltmeter V2 is connected across the switch S. The connecting wires have negligible internal resistance. emf=10V i-=— i) i @ 10Q 50 20 $ ae e Switch $S is initally open. 9.1 Write down the reading on voltmeter V2. (1) Switch S is now closed. The reading on voltmeter V; is 8 V. 9.2 What is the reading on V2? (1) 9.3. Calculate the total external resistance of the circuit. (3) 9.4 Calculate the internal resistance, r, of the battery. (5) 9.5 How will the reading on the voltmeter V, be affected if the 5 © resistor was removed? (Choose from: INCREASES, DECREASES or STAYS THE SAME.) (1) 9.6 Explain your answer to Question 9.5. (3) [14] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 17 (Paper 1) 10841 / 19 QUESTION 10 (Start on a new page.) The diagram below shows an AC generator. The main components are labelled A, B and C. in Axle 10.1 Write down the name of the components labelled: 10.1.1 A (1) (1) (1) 10.1.2 B 10.2 Write down the function of component C. P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (Paper 1) 10841 / 19 18 The graph below represents the output current vs time for an AC generator. Use the graph above to answer the following questions. 10.3 10.4 10.5 At what position was the coil relative to the magnetic field of the generator for the current output to be a maximum? (Choose from: PERPENDICULAR or PARALLEL.) Calculate the rms current (lms) for this generator. Calculate the average power dissipated by a 100 O resistor connected across the terminals of the generator. (1) (3) (3) [10] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 19 (Paper 1) 10841 / 19 QUESTION 11 (Start on a new page.) In an investigation, the metal plate of a photocell, shown below, is irradiated with green, blue and violet light. green light \ Som light source photocell metal plate The results of the investigation are shown in the table below. Reading on Colour Wavelength (nm) ammeter green 560 No blue 500 Yes violet 430 Yes 11.1. Define the work function of a metal. (2) 11.2 Explain why no current is registered when green light is used. (2) 11.3 What effect will increasing the intensity of light have on the reading of the ammeter when blue light is used? (Choose from INCREASES, DECREASES or STAYS THE SAME.) (1) 11.4 Explain your answer to Question 11.3. (2) 11.6 Calculate the energy of a photon of blue light. (4) [11] TOTAL: 150 P.T.Q.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 20 (Paper 1) 10841 / 19 DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity g 9,8 ms? Universal gravitational constant G 6,67 x 10" N-m?-kg? Speed of light in a vacuum c 3,0 x 10° m-s* Planck's constant h 6,63 x 10 J-s Coulomb's constant k 9,0 x 10°N-m*-C? Charge on electron e 1,6x10%C Electron mass Me 9,11 x 10°" kg Mass of the earth Me 5,98 x 1074 kg Radius of the earth Re 6,38 x 10° m P.T.O.

Downloaded from hlayiso.com TABLE 2: FORMULAE MOTION PHYSICAL SCIENCES: PHYSICS (Paper 1) 10841 / 19 21 Vp =Vjetaadt Ax = v,At+adt? or Ay =v,At+iaAv? VP =v)? +2adx or v,? =v? + 2aay Ax= (“4 At or Ay = (A) At FORCE Fi =ma p=mv tr" = BN i, = uy,.N F,.At =Ap Ap = mv, —mv; we=mg mm M M F-G™ or F=G g-G of g=GG .WORK, ENERGY AND POWER W=FAxXcose U=mgh or E,=mgh 1 : 1 K=> mv? or E,=>mv et = AK or Wie = AE, AK=K,-K, or AE, =E, -E, Wy, = AK +AU or W,, = AE, + AE, p= P, ove = FVave i Pyem = FV gem , WAVES, SOUND AND LIGHT v=fh qe! f viv viv, f,=——+4, f= t E=hf =h& ‘viv, ° ‘vey, ° or E=hy E=W, + Emax or E=W,+K,,,. where E=hf and w, =hf, and Ema) = FIV Or Kinex J mv P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (Paper 1) 10841 / 19 ELECTROSTATICS kQ,Q kQ Fae E=> vw eof q q n=2 or ne a e qe ELECTRIC CIRCUITS emf(e)=KR+r) Rov | emk (€) =K{R +r) R, =R,+Rg+ Jl1,1, q=lat R, R, Ry WeV q paw W=VIAt We PRAt P=vl — 12] Vat P=IR We R _v? ALTERNATING CURRENT I Pave = Vans lms / Poem = Vwok Tygk lms = i / Tye = 2 2 Pea 1 Pram = egg V, V, Vems == / Vuge == 2 2 V2 wok V2 P= Vie l Pan = “2 END