Physical Sciences Grade 12 P1 Gauteng Mock 2017 QP

Downloaded from hlayiso.com ‘, GAUTENG PROVINCE GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION 2017 10841 PHYSICAL SCIENCES: PHYSICS FIRST PAPER | TIME: 3 hours MARKS: 150 15 pages + 4 data sheets and 1 anewer sheet PHYSICAL SCIENCES: Paper 1 Min wat X1@ Tin P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 2 {First Paper) 4084/17 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION - 2017 PHYSICAL SCIENCES (First Paper} TIME: 3 hours MARKS: 150 INSTRUCTIONS AND INFORMATION 1. 10. a This question paper consists of 10 questions, Answer ALL the questions in the ANSWER BOOK. Start each question on a NEW page in the ANSWER BOOK. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line open between two sub-sections, 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 decimal places. Give brief discussions, et celera where required. Write neatly and iegibly. PTO.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 3 (First Paper) 10841/17 QUESTION 1: MULTIPLE-CHOICE, QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A ~ D) of your choice next to the question number (1.7 — 4.10) in the ANSWER BOOK, e.g. 1.11 D. | 14 12 1.3 Passengers on a moving bus lean over to the right when the bus makes a sharp left jurn. This is an example of .., A Newtorrs first law. : B Newton's second law. | € ~~ Newton's third law. : D The Law of Universal Gravitation. (2) Two point charges are a distance rapart and are positioned as shown in the diagram below. An electrostatic force pf magnitude F exists between the two charges. meaner ee Le “a +Q2 The distance between the twe charges is reduced to i _ The new force between the charges is ... A F B SF c OF 1 DB 3 F (2) A half-brick is thrown vertically upwards and caught by a builder at a height 4 above the ground, A full brick is also thrown vertically upwards and is caught by the same builder at the same height. Ignore all effects of friction. Which one of the following is TRUE concerning the bricks which were thrown? The haif-brick will take a shorter time to reach the builder. Both bricks have the same kinetic energy when they are thrown. Both bricks have the same velocity when they are thrown. Both bricks have the same momentum when they are thrown. Q) OO > P.T.O.

1.4 1.5 16 Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 4 (First Paper) 10841/17 The impulse on a ball bouncing off a wail is equal to the ... average force of the ball on the wail. change in momentum. rate of change in momentum. product af the mass and the acceleration of the ball. (2) gO Dy Two spring-loaded trolleys of equal mass are “exploded” by releasing their springs simultaneously, Immediately after the explosion the trolleys move in opposite directions with equal velocity. Which one of the following statements is correct regarding the moving apart of the trolleys? In an isolated system, the total momentum is conserved. The net force equals the product of mass and acceleration. Momentum equais the product of mass and velocity. Impulse equals the product of the nett force and collision time. (2) guO@> A bird flies directly towards a speeding bus. it crashes head-on with the windscreen of the bus. Which one of the following statements is CORRECT? A The foree exerted by the bird on the windscreen is less than that exerted by the windscreen on the bird. 5 The force exerted by the bird on the windscreen is greater than thal exeried by the windscreen on the bird. c The force exerted by the bird on the windscreen Is equal in magnitude to the force that the windscreen exeris on the bird. D The impulse acting on the bird is greater than the impulse acting on the windscreen. (2) PLT.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 5 (First Paper) 4084117 1.7 Which one of the following units is NOT equivalent to the Watt? A Js 8 Av" Cc AV D BO (2) 1.8 Amodel car has a motor with variable speed. Which ONE of the following modifications for the motor will NOT increase the speed of rotation of the motor? A increasing the number of turns in the colt of the motor B Winding the armature coil around a zinc core G Increasing the current flowing through the coil of the motor D increasing the strength of the magnet in the motor (2) 1.9 Tosee an absorption spectrum, dispersed light must ... come straight out of a white hot filament. have passed through a gas that is substantially cooler than the source of light. have passed through 4 gas that is substantially hotter than the source of light. have passed through 4 gas that is at the same temperature as the source of light. (2) 1.16 Which one of the following is TRUE concerning the photoelectric effect? oO > A Light of higher frequency emits electrons with lower kinetic energies. B If we shine low intensify light with low energy photons on a clean metal surface long enough, electrang will eventually be emitted, G if we shine high intensity lignt with low energy photons on a clean meial surface fong enough, électrons will eventually be emitted. dD Most metals will emit electrons when ultraviolet light shines on them. (2) [20] P.T.O.

Downloaded from hlayiso.com QUESTION 2 PHYSICAL SCIENCES: PHYSICS (First Paper) 1084117 (Start on a new page.) A 120 g tennis bail is dropped from the top of a building. It bounces off a baicany 12 m below and finally falls to the ground. The diagram below shows the flight of the ball. ignore all effects of friction as well as any horizontal motion of the ball. “4aooe jem -¥.-- DB Balcony 2.1 2.2 Galoulate: Caiculate the velocity with which the tennis. ball strikes the balcony. 2.2.1 The kinetic energy just before the bounce 2.2.2 How high the ball rises above the balcony after the bounce 23 balcony. 24 points on your sketch: et & ® & only.) Velocity with which the ball hits the balcony Time of flight of the bail to reach the baicony (Mark as t; only.) Velocity with which the ball leaves the balcony Time the ball reaches maximum height after bouncing olf the baleany (Mark as * Total time of flight of the ball (Mark as t; only.) The energy transformed to other forms when the ball strikes the balcony is 2 J. Sketch the velocity versus time graph of the ball’s entire flight. Show the following (2) The ball finally strikes the ground 3,16 s after the bounce. Calculate the height of the (3) (4) (7) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 7 (First Paper} 10841/17 QUESTION 3 (Start on a new page.) Most modem cars incorporate safety features thal are designed to protect the driver and passengers in the event of a head-én collision. In testing one of such safety features, a car is crashed into a rigid concrete walland its front crurmples as shown in the diagram below. Solid wall Solid wall Before collision After collision The results of one such test are shown below. Data: Carmass = 1000kg Speed of car at impact = 120 km-h” Original length of car = ds =2,4m Crushed length of car = d2 = 2,0m ignore the effects of friction. Assume that there is no loss in mass as a result of the collision. : 3.4. Draw a labelled, free-body dlagram of all the forces acting on the car during impact. (3) 3.2 Convert 120 km-h" to SI units. (i) 3.4 State ihe WORK-ENERGY theorem. (2) 3.4 Assume that the force acting on the car is constant throughout the collision. 3.4.1 Use the WORK-ENERGY theorem to calculate the nett force acting on the ear during the collision. (5) 3842 Calculate the time taken for the car to come to rest. (4) 3.43 Explain the purpose of a crumple zone in modern cars (3) {18} P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 8 (First Paper) 1084417 QUESTION 4 (Start on a new page.) A 100 kg box slides down a rough inclined plane. A man applies a constant force F on the box such that it slides down the inclined plane at constant velocity, 4.1 Draw a labelled, free-body diagrarn showing all the forces acting on the box as it slides down the inclined plane. (4) 4.2 Write down the magnitude of the nett force acting on the box as it slides down the inclined plane. Give a reason tor the answer. (2) The frictional force between the box and the inclined plane is 60 N. The vertical height is 12m. 4.3 Whatis a non-conservative force? (2) 44 Calculate the work done by the man on the box. (8) 4.5 Calculate the magnitude of force F exerted by the man on the box. 4 [18] P.T.O.

Downloaded from hlayiso.com i PHYSICAL SCIENCES: PHYSICS 9 (First Paper} 10841/17 QUESTION 5 (Start on a new page.) Two small identical metal spheres A and B carry charges of +9 uC and -3 uC respectively. They are placed 20 cm apart as shown in the diagram below. A ‘ 20em B ‘* > +8uc Bn 5.1 Whatis meant by the staternent. the charge is quantised? ) 5.2 The spheres are brought into contact with each other, separated and placed at the same positions as before. . i : 5.2.1 Calculate the new charge on each sphere. @) 5.2.2 Calculate the change in charge for each sphere and the nurnber of electrons that are transferred. - (3) 5.2.3 What is the direction of electron transfer between the spheres. Write only A to B or B to A. a ‘The charged spheres A and B with original charges are now arranged as shown below. X is a point 4 em to the right of sphere A. §.3 State Coulornb’s Law in words. (2) 5.4 Calculate the electrostatic force between the two spheres. {3} 5.5 Calculate the magnitude of the nett electric field at point X as a result of the charged spheres A and B. (4) [18} P.T.O.

Downloaded from hlayiso.com QUESTION 6 (Start on a new page.) Use the ANSWER SHEET at the end of the question paper to answer Question 6.2. 64 6.2 63 A fire truck has just stopped at an accident scene with its siren of frequency 380 Hz still on. The driver of an ambulance driving away from the accident scene hears the fire truck’s siren’ as 360 Hz. This is shown in the diagram below. Take the speed of sound in air as 340 ms. 6.1.1 Define the Doppler effect. 6.1.2 Calculate the speed of the ambulance in km-h*. The wave fronts 3,2,1 and others shown on the diagram above, originate frorn the sound source. On the ANSWER SHEET provided, draw the new relative positions of the wave fronts 2 and 1 as encountered by the car's driver, which would explain why the driver hears a lower frequency. Hand in the ANSWER SHEET with your ANSWER BOOK. Give TWO real-life examples where the Deppier effect is applied. PHYSICAL SCIENCES: PHYSICS 10 (First Paper) 1084117 (2) (5) (4) (2) [13] PLT...

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 11 (First Paper) 1084117 i QUESTION 7 (Startona new page.) Learners set up a circuit, as shown below, to investigate the relationship between the potential difference across a variable resistor, R, and the current through the resistor. 7.1 Inthis experiment, name the ws 7.1.1 independent variable. (t) 7.1.2 dependent variable. (t) 7.2 The learners obtain a set of corresponding readings of potential difference and current, Two of the readings are shown in the table below. Reading number | Current (A) | Potential difference (V) For external resistor 1 0,3 2,52 2 16 ; 5,71 By means of a calculation, determine the internal resistance of the baltery. (3) P.T.O.

7.3 7.4 Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS } 12 (First Paper) 40841417 The learners now used their results to draw the following graph. potential difference (v) LS Use information from the graph to ... 7.3.1 determine emf of the battery (no calculation is necessary). (2) 7.3.2 determine current () when the battery is short-circuited (no calculation is necessary). (2) 7.3.3 calculate the internal resistance of the battery. (2) Give a reason for the slight deviation in the answers from Questions 7.2 and 7.3. Q) [12] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 13 (First Paper) 1084117 QUESTIONS —(Start on a new page.) A batiery with an emf of 10 V and an internal resistance of 1 Q is connected to three external resistors as shown in the circuit below. rerio 1 i —<c | I | reap he ee ! ®) 62. 20 s = 40. initially, switch 8 is closed. 3.1 Calculate the current flowing in the circuit. (5) 8.2 Write down the reading of Vs. (2) 8.3. What happens to the reading of V; if switch Sis opened? Choose trom STAYS THE SAME, INCREASES or DECREASES. Explain the answer without any calculation. (3) : rio} P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS 4 (First Paper} 10844/17 QUESTION 9 {Start on a new page.) The diagram below shows the essential parts of a generator. coil rotates clookwise’= magnet north face ~-——7” a - t south face fd ; er extemal luad 9.1 Is this an AC or DC generator? Give a reason for the answer. 2) 9.2 The cail abed rotates clockwise within the magnetic field. Draw the shape of the voltage established across the external resistor for two cycles of the coll. Start with the coil in a horizontal position as shown. @ 9.3 With the coil starting in the horizontal position as shown, what would be the direction of the induced current? Choose from a te b or b to a. 1) 9.4 The generator shown above delivers a maximum voltage of 6 V, 9.4.1 Define the term rms current. (2) 9.4.2 Calculate the rms current of this generator. (4) 9.4.3 Calculate the average power dissipated at the external load. (3) [14] P.T.O.

Downloaded from hlayiso.com ; PHYSICAL SCIENCES: PHYSICS 15 (First Paper) 10841/17 QUESTION 10 (Start on a new page.) The diagram below shows electron transitions between energy levels of an atom. e. Cc 484x107 J Ey B “5.44 10" E, 2. - 5,44 x10 J Ey : -2,18x 10 yu 10.1 A photon of light is released when an electron moves from the Es state to the E, state. Calculate the frequency of this photon. 6) 10.2 How many different phoions can be produced when excited electrons move from the E, state to the E, state? Gy) 103 103.1 Define the work function of a metal. (2) 10.3.2 The photon in Question 10.1 is incident on a metal surface. The work function of the metal is 2 x 10 J, Calculate the maximum velocity of the ejected electron. ie TOTAL: 150 END

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (First Paper) 1084117 16 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 3,0x 10° ms" Planck’s constant h 6,63 x 10 Js Coulomb's constant k 9,0 x 10°Nm?2.C? Charge on electron e 1.6x10%c Electron mass Me 9,11 x 10" kg Mass of earth M 5,98 x 10" kg Radius of earth Re 6,38 x 10°m

Downloaded from hlayiso.com TABLE 2: FORMULAE PHYSICAL SCIENCES: PHYSICS (First Paper) 1084117 7 MOTION Vp=yjpradt Axa v,At+taal or Ay =v,dt+ paat® | 2.8 Vv, +V. Vy, a¥ v/ ev? +2adx ov, =v + 2ady | ax (45% Joe or ay=| S “at FORCE F = ma = mv a = nN f, =H,N fo Ats edt = Ap wemg Ap.= my, ~my, mm mm M M F=G a or F=G a g=Ge or g=G5 WORK, ENERGY AND POWER We=Faxcose __[Usmgh or. =mgh 1, 1 Wye = AK or | Wie = AE, Ke5 mv? or E,=3mv" ; AK=K,—K, or AE, =E,y ~E, W,, =AK+AU or W,, = AE, +46, od ave 7 Pose = Fv, Pov = FY gor

Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (First Paper) 1084147 18 WAVES, SOUND AND LIGHT - . . a vefa Tt Mean ove eff or Eah® Vay, La f, viv, E=hf or E=h> E= Wy + Bnmag or EsxW,+K,... where E=hf and W,=hi, and E zt Wim OF Knay = fmvin, ELECTROSTATICS f= KOs g-M val E af. q _. q n=o one

Downloaded from hlayiso.com ELECTRIC CIRCUITS PHYSICAL SCIENCES: PHYSICS (First Paper) 10841/17 19 Vv emf (e}= KR +r) R= | emk (e}= R40 R, =R, +Re + Jet y ly qe=lAt RR, R, WeVg Pe w We Viat | We PRat P=VI 23 Vat earn We Pp ave R 5 ; ALTERNATING CURRENT a 1 ' Pave = Vea bres i Panis = Vovatel vgs Ting 2 f leon ® ms weg v2 ve PR =yR / Py, = YR Vv, Vine Ving 2s / Vv, == 2 2 me 15 wok 2 Py = Mus / Porn = “ee

NAME: Downloaded from hlayiso.com PHYSICAL SCIENCES: PHYSICS (First Paper) 1084117 20 ANSWER SHEET QUESTION 6.2 GRADE 12: