Physical Sciences Grade 12 North West Mock 2016 QP

Downloaded from hlayiso.com Physical Sciences tke NWiSeptember 2016 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each ‘question has only ONE correct answer. Choose the answer and writ only the letter {A-D) next te the question number (1.1-1.10) in the ANSWER BOOK, for example THE. “A isamer drops a ball from the top of a building.” USE THIS INFORMATION TO ANSWER QUESTIONS 1.1 to 1.2 tt The graph for the motion is shown below, yn . L_____-> ima (=) Which ONE of the follewing physical quantities could be represented on the yrands of the graph below, indicaling the bait is in the alr? j @ Momentum ‘ @ Acceleration 12 After falling a certain distance d, the bal’s Kinetic energy 1s proportional to... @ a » OMGEC) aj. 4, Copyright rsemed Psnse tim aver

Downloaded from hlayiso.com Physical SclerceniPt a VSuplomber 2008 13 Which action stated below requires NO work to be done on tha specific object? ) Lifting an abject trom the ficor to thi ceting. @) —_ Moving an object along the flear against friction. © Decreasing the speed of an object until it comes to rest, © Holding an object stationary abave the ground. 14 A toy gun la fixed fo.a small cart and both move to the right with speedy along 4 straight track, as shown below. When the qun fires a bullet, the cart vith the gun is brought to rest, if M ls the mass of the cart and gun combined, and mn is the mass of the bullet, what is the speed of the bullet immediately after tis fred? ee Copyright reserved: Pisnea tum over

Downloaded from hlayiso.com : 4 q : Physical Scianoent nee NWiSeptember 2016 1s ‘The diagrams show the motions of a source of sound § relative to an observer 0. Which one of the options below correctly represents the effect of this motion on the frequency heard by the observer? Motion of Sand 6 ‘Frequency A stationary ) t——9S OL) increases stationary ——eg 00 Decmases @ stationary 8% Oe KG) stationary BS Ge np No a @ 1.6 Some of the energy levels of an excited hydrogen atom are shown below. = E & gE & ‘Which transition would be caused by the absorption of the lowest frequency of radiation? @® &w& @®@ & wo & © awe @ & 0 & @ WW Which ONE of the statements below about an AC motor is CORRECT? ) tthas sip rings and carbon brushes. ©) thas sfip rings, but no carbon brushes. © —thas.a spit ring commutator and carbon brushes. @® ithasa spit ring commutator, put ne carbon brushes. @ Copyright reserved Pioase ben over

Downloaded from hlayiso.com Physical SdencesP 1 tee ANUSaptenrber 2016 1.8 Ties charged spheres are placed horizontally along a straight fine, Spheres Xand ¥ have kientical changes of +G. What change on sphere Z wil result In 4a net force of 0 N on sphere ¥? ‘O...O.9 1a Which ONE of the diagrams below is NOT the correct elncitic fled pattem ‘dus fo an Isolated point charge? 1.10 The heat produced in 2 current canying wire Is X joules in 1 =. The same amount of current is passed through a second wine having the same thickness bul HALF the resistance. The heat produced in the second wire in 2.3 will be ... © @) x @ Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Science eo RWiSeptorber 2016 QUESTION 2 (Start on a new page.) Two wooden blocks of masses 2 lay and 9 kg respectively are placed on a rough horizontal surface. They are connectad by a string. A constant horizontal force of 10 Nis applied fo the Second string attached fo the 3 ky mass es shown In the diagram betew. Assume that both strings are light and inaxtensibie. 10N Pig 4 So LN ‘The system moves towards tha right with @ constant velocity. 21 Dieting the tern sdnetic tictonal force. 2} 22 Whatis the magnitude of the net farce acting on the system? a) 23 3 fy block sa moses Cae anoring ALL te foress acting onthe 3 ky block as t moves toward 6) 24 Gualculate the coefficient of Hinatic friction between the surtace of the table and the two wooden blocks, 4 ‘The 10 N force is incraased to 30 N so that the system now accelerates. 2.6 Calculate the acceleration of aystem. &}

Downloaded from hlayiso.com Physical Scianoeant 8 NWiGeptamber 2016 QUESTION 3 (Start on « new page.) A stone is dropped from the root of a tal building, Atter @ has fatien a distance of x metres, & passes a window which is 3,08 mn high in 0,1 &. Fister to the diagram below. t x t 3,05 99 3.1 Defing the tenn free ind, @ 3.2 in which direction is the stone accelerating as it passes the window? ‘White down only UPWARDS, DOWNWARDS. Ww 33 Prove that the distance of x metres, between the roof and the top of the window is 45,95 m. 8) 34 Sketch a velocity-time graph from the instant the stone ia dropped to the time it reaches the top of the window. Indicate the velocity when it reaches the top of the window. & Copyright reserved Pigase ten over

Downloaded from hlayiso.com Physical SciencesiPt g NW RSeprember 2016 QUESTION 4 (Start on a new pegs.) Truck A. of mass 2 000 kg moving eastwards collides with truck 8 of mass 1 500 kg. The graph (not drawn io seale) shows how the momentum of each of the trucks varies with time. 44 White down the principle of conservation of inear momentum. @ 42 Write down the intial momentum of truck A. ro) 4.3 Deternine the magnitude and diction of the velocity of truck B before the collision. cs 44 isthe collision between the trucks ELASTIC or INELASTIC? Show how you arrived at the answer hy means of calculations. e ‘Capyright reserved Pinese tum over

Downloaded from hlayiso.com Physical Sciences 40 NW /Sepiember 216 QUESTION 5 (Start on a new page.) A 20 kg box initially at rest, is pulled 5 m along a rough horizontal floor. A constant forse of 130 N is applied at an angle of @ to the horizontal, The coefficient of idnetic friction between the box and the floor is 0,3. 30.N 20 kg 120g 5.1 Calculate the value of angie 6 if the work done by the applied foren Is 325 J. {3} * 2 Calculate the work done by the kinatic frictional tarce. ) 5.3 Using the WORK-ENERGY principle and calculate the speed of the box after moving through Sm. i] After the firet_ 5 m, the same force is now applied horizontally and paraliel to the floor over a further 5 m. 5.4 Will the magnitude of the kinetic frictional fore INCREASES, DECREASES: ot REMAIN THE SAME? Give a reason for your answer. e 13] Copyright reserved Piousa ton over

Downloaded from hlayiso.com Physiogt Sciences t ly NW/Sepiernber 2018 QUESTION 6 (Start on a new page.) 5 sound snurme, moving af constant speed, approaches and then passes a stationary detector. ‘The minirarn and maximum frequencies detected am 749 Hz and 751 Hz. The spoad of sound In alr is 340 ms, 6.1 Wiite down the Doppler effect in words. (2) 62 Al what stage was the frequency of sound recorded equal 10.748 Hz? While AWAY FROM the datactor,) th 83 is the wave length detected at a frequency of 751 Hz, GREATER THAN, LESSER THAN or EQUAL TO the wave length of the sound produced by the source? a 64 Detennine the speed of the sound source. @ fay QUESTION 7 (Start on a new page.) ‘Two identical metal spheres each of mass 10 kg are placed on an insulated surface as shown, SN SARA AA QE SS] HOH 7.4 Write down Coulomb's law in words, 2 7.2 Galeulate how much charge of equal magnitude each sphare must have # the olectrostatic force must be exactly equal fo the gravitational farce exerted by one sphere on the other? ® 74 Two point charges q: and q are placed 50 cm apart. Charge q; cartes +20 nC and qs caries -80 nC. Point X, ¥ and Z along a straight line are positions in the eleciric fieki surrounding the charges. Refer fo the diagram below. . Se BO ere EO co ae a z w +. sy sean toner EMRE ce s 73.1 inwhich position (X, ¥ or Z) can the electric field be zero? a 732 Point 2 is 76 em from point charge q;. Calculate the net electric field at & ‘Copyright reaacved Pease tum over

Downloaded from hlayiso.com Physical Sclencan1 ws NWSeptember 2016. GUESTION 6 (Start on 2 new page.) Leamers perionn an experiment to detemnine the intemal resistance of a battery using the ciroult diagram below. 1 r-| Heh x ¢———(V +4" noone ‘The readings obtained from the experiment are shown: In the table below. Aim 9 2 4 8 8 tury 014 | 026 | O98 | O45 | O62 8.1 ‘The equation used by the leamers is: Reaper {Use the data from the table to draw a graph of F verses t ON THE GRAPH SHEET provided. ®@) 3.2 Whatis the physical quantity represented by tha slope of the graph? ay 8.3 Use infomation from the graph to déteming the value of the: B31 emfof the battery @ 5.3.2 intemal resistance of the battery @} 8.4 = The volemeter across XY is replaced by a connecting wire of negligible resistance. Detennine the current in the battery. ‘Copyright reared Pisase tam over

Downloaded from hlayiso.com Physical SciencsaiPt 3 NWSeptember 2046 QUESTION 9 (Start on anew page) In the circuit below, two resistors ars connected in paratiel, 1o a betiery with an intemal resistance rand a high resistance voitmeter. i r prmeenvenmeanes When $2 is open and &; closed, the volimeter reading is 12 V. ‘ When 3, is cloeed and S, open, the volimater readirig is 16°V. 9.4 ‘Write dewn Obm’s law In words. gi a2 Caloulate the voltmeter reading when toth switches: 924 8 and Sz are open . {5) 822 Sy and Sz are closed (6 fis] ‘Pinas tun over

Downloaded from hlayiso.com Physical Soiree 8 QUESTION 9 (Start on a new page) SON September 2016 in the: circuit below, two resistors are connected in pamiiel, to a battery with an intemal retistance T and a high resistance voltmeter, { H hos i] it ‘When S; Is open and 8, closed, the voltmeter reading Ie 12 ¥. When &; is closed and 8; open, the volemeter reading is 16°V. 9.1 White down Ohm's taw in wards. 92 — Caloulaie the volimeter reading when both awitches: 92.1 Sand S,are open : G22 &; and S, are closed Coppight raseeved ca ges 8 Pisase tun over

Downloaded from hlayiso.com Physical Sciences? ia NWw7Saptenber 20168 QUESTION 10 (Start on a new page.) Consider the following simplified diagram of a portion of ar AC generator. 10.4 What is the direction of the magnetic field if the direction of the current is as shown In the diagram? Write from LEFT TO RIGHT or RIGHT TO LEFT, a) 102 How will the magnitude of the Induced current in the coll change when ‘the speed of rotation of the col in the magnetic fled In incraasad’? ‘ Wete INCREASES, DECREASES or STAYS THE SAME. a 10.3 Whal type of energy conversion takes place in the electric ganerater? ti) The following figures (1, 2, 5, 4 and 5) represents one full clockwiee rotation of the colt Fig Fig: 2 Fig: 9 Fig: 4 Fig 5 b e CJ b aa = 2 > 10.4 Draw a sketch graph of current verses time for one complete rotation of the coll. Show the position of the col corresponding te the current ” o Os a values of 1, 2,9, 4 and 5. @ 5 A of average power 20 W is connected ta the oulput terminals of generator is 12 V. Calculate the peak current through the lamp, 6) ") Copyright reserved ‘Pleaser tam ony