Physical Sciences Grade 12 P1 Limpopo Mock 2023 Paper & Memo

Downloaded from Stanmorephysics.com NATIONAL SENIOR CERTIFICATE MARKS: 150 TIME: 3 hours This question paper consists of 19 pages and 3-paged data sheets.

Downloaded from Stanmorephysics.com QUESTION 4 (Start on a new _— Various options are Provided as possible answers to the following questions. Choose the answer and writ fe only the letter (A-D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer. 1 ONE of the following is the CORRECT term for the gravitational force arth exerts on any object on or near its surface? A Weight B Friction C Tension D Compression (2) 1.2 The attfuck places a suitcase on the level dashboard in front of him. He obser ;" € suitcase is sliding towards the windscreen. At this instant the truckiS probably moving ... A forward at constant velocity. B backward and slowing down. C forward and slowing down. D backward at constant velocity. (2) Copyright reserved Please turn over

4 Downloaded from Stanmorephysiggich one of the following combina, 1.3 1.4 sail , Astone is thrown vero acceleration and velocity one secong before correctly represents HN? reaching maximum height? _— Assume that air resistance IS '9 VELOCITY ACCELERATION 9,8 mos* upwards f 9,8 mis* upwards — B 9,8 mos” downwards 9,8 mUs” upwards Ds cpgedlalaenwmeenmenacs | Cc 9,8 mus“ upwards 9,8 mos downwards D 9,8 mus? downwards 9,8 mus* downwards . a lower speed limit and the driver slows down the A car approaches a road with car. The two vectors pi and respectively. pr below represent its initial and final momenta pr pi er ee Which ONE of the following vector diagrams CORRECTLY represents the change in momentum (Ap) of the car? + A 5 = c D _ () Copyright reserved

Physical Sciences/P4 5 Downloaded from Stanmoreph¥sics.com 1.5 Al ject i i 's dropped from a height h above ground level, Which ONE of th “ 9 graph BEST represents the relationship between its kinetic ' (Ex) and its height above ground level? li B ih Ex 0 LimpopoDoE/September 2023 h 0 h C D ° . eo 0 h " h (2) 1.6 How does the frequency and wavelength of a wave source change when it moves towards the observer? A The wavelength increases whilst the frequency decreases B The wavelength decreases whilst the frequency increases C The wavelength decreases whilst the frequency decreases D The wavelength increases whilst the frequency increases

6 Downloaded from Stanmorephyslés.com Qi and a negative point charge Qe of equal mn Pn int charge A . gn; PS pe on as shown in the diagram below. Tuga are ne! Qe Qe enna O@---+-+~_ ox ™ Y en, bboy halfway between Qx and Q2. Which ONE of the following combinations gives the correct direction of the m electric field due to the presence of the charges Qi and Q2 at positions x y and Z respectively? X ¥: ae A Right Left 3 _ Right ~~ B Right Right : Left Cc Left Right Right 2 Left Right Left Bern 0

Physical Sciencesip4 Downloaded from Stanmorephysies.com LimpopoDoE/September 2023 1.8 In the given Circuit di IDENTICAL. cuit diagram below, the three light bulbs Li, L2 and Ls are = PRE-€are readings on the ammeters in the circuit. 2) tf i) C a Which ONE of the following mathematical equations is CORRECT? A Y=X-Z B X=3Y Cc X=Y+Z D X=Y-Z (2)

8 Dawaleedat! from Stanmore}ifysics.com sents the output of an AC Generator. 7 ; re: me generator after a Change his below reP! 49 Thesolidline inthe graph output of the $4 dotted line represents been made to the gene rator. ——> Times (s) Which ONE of the following could be the change made to the generator? A The number of turns on the coil was halved. B The strength of the magnetic field was halved. C The speed of rotation of the coil was halved, D The surface area of the Coil was doubled. Q)

Physical Sciences/P4 Sei LimpopoDoE/September 2023 Downloaded from Stanmorephysics.com 10 The diagram below indicates an i energy level diagram that i the four energy levels in an atom. ° eae 4 | Es 8 - E2 fl ls | 2 Ei y | P Eo Which ONE of the four energy transitions has the SHORTEST wavelength? A P B Q Cc OR D 6S (2) [20] Copyright reserved Please turn over

tart on a new page) aussHge Ged from Stanmorgahssiieneduaiined at an angle of 30° to the S| k of mass 2 kg is i oot as shown in the diagram below ion px between the block and the plane is 0,20. The coefficient of kinetic fricti 231.1 Define the term kinetic frictional force. (2) 2.12 Draw a labelled free-body diagram for the block whilst in motion. (3) 2.1.3. Calculate the acceleration of the block. (5) 2.2 In two adjacent buildings of the same size, the two walls nearest one another are 7 m apart and the walls furthest from one another are 35 m apart, as the diagram below illustrates. Use an appropriate calculation to show thatthe gravitational fore thatthe vo inner walls exert on each other is 25 times bigger than that of the two outer walls on each other (i.e. Fatinner walls) = 25 x Fg(outer walls)) (14)

Physical Sciences/P1_ 5 1 Si ol QrsRrAechefcR'D nab daRGrePhySics.com A mountain climber throws two identical stones from a high cliff to a Pool of water which is 50 m below the cliff. The first stone A is thrown vertically downwards with an initial vertically downwards with a velocity of 2 mUs-'. After 1 s, the second stone is thrown an unknown velocity, Both stones A and B reach the water surface of the pool at the same time. LimpopoDoE/September 2023 50m Ve alew 7 S = zy Sg ba? Pl __Water surface Neglect the effects of air resistance. 3.1 Explain what is meant by a projectile. 3.2 Calculate, by using THE EQUATIONS OF MOTION, the: 3.2.1. Time taken by stone A to hit the water 3.2.2 Time taken by stone B to hit the water (1) (3) 3.2.3 Initial velocity of stone B

12 Cc. Downloaded from Stanmore fi SicS.com ,, ? y: ‘fion-versus-time graphs for the motions xes, Positions fr i ao oa ane sae! that they are thrown until they hit the water of the two stones \ P ERENCE. elisa SURFACE AS THE ZERO REF i Ss: show the values of the following on the graph e at which the stones hit the water. « Time at which stone B is thrown. . i ¢ Initial height of the stones above the water surface. [14] QUESTION 4 (Start on a new page) A 0,005 kg bullet is fired horizontally into a 3 kg wooden block resting on a horizontal . The bullet remains embedded in the block, which is observed to slide 0,25 m ie surface before stopping. lo the diagram below). i + W E | | | | \ . Before collision After collision The coefficient of kinetic friction between the block and surface is 0,20 Neglect the effects of air resistance. 41 Is frictional force an EXTERNAL FORCE or INTERNAL FORCE? (") 4.2 State the principle of conservation Of linear momentum j ords. 0 4.3 Calculate the: 4.3.1 Velocity of the block after the bullet has been embedded in it 0 4.3.2 Initial velocity of the bullet before Striking the block i {it

13 . LimpopoDoE/September 2023 Downloaded from Stanmorepfiysics.com QUESTION 5 (Start on a new page) A pulley system with a mass piece is operated by an electric motor. It is used to lift a load of 120 kg.vertically upwards at a constant speed, as shown in the diagram below. Light frictionless pulley 125 kg |Load {io kg |Mass piece The load covers a distance of 6,8 m in 0,01 seconds. Neglect all the effects of friction. 5.1 Define, in words, the term power as applied in Physics. (2) 5.2. Calculate the work done by the gravitational force on the load. (3) §3 Determine the average power output required by the electric motor to lift the load through 6,8 m in 0,01 seconds. (7) [12] Copyright reserved Please turn over

14 NSC Downloaded from Stanmorephysics.com QUESTION 6 (Start on anew page) 6.1 6.2 k radio awakens him/her with a steady and irritating Hz One morning, it malfunctions and cannot be turneg A physics learner's clo drops the clock radio out of his/her fourth-story sound of frequency 600 off. Inffrustration, the learner : the ground. Oo cron (a8 _ Ignore the effects of air resistance, do! . Assuréthe speed of sound is 343 mUs | L 6.1.1 State the Doppler effect in words. (2) 6.1.2 Calculate the frequency that the learner hears just before the clock radio strikes the ground. (6) 6.1.3 Explain the change in frequency observed by the learner with reference to the speed of the clock radio. (3) A helium line from the spectrum of the sun has a frequency of 6,20 x 10" Hz, The frequencies of the same helium line from the Earth, which are observed in the line emission spectrum of two stars, are: Star X : 6,24 x 1014 Hz Star Y : 6,04 x 1014 Hz 6.2.1. Which ONE of the stars (X or Y) has a red shift? (1) 6.2.2 In which direction Away from the Earth or Towards the Earth does star X move? a [13] EEE)

15 LimpopoDoE/September 2023 Downloaded from Stanmore}fysics.com QUESTION 7 (Start on a new page) 71 A:small sphere X having a mass of 8 x 10? kg and a charge of +6 x 107 C yangs vertically by a thin wire of negligible mass. When the charge Y of -9.x.107 Cis brought closer to the sphere, the wire makes an angle 6 to the vel hen brought to rest 0,15 m away from the charge Y, as shown in the di below. ir) | | | | | | X Y __--_045m__ “7AM +. State Coulomb’s Law in words. (2) 1 A .2° Draw a labelled free-body diagram for the sphere X when at rest. (3) ~ Calculate the:: 7.1.3: Electrostatic force exerted by sphere X on charge Y (3) 744 : “Angle 6 shown in the diagram (4) S7A.5° Tension in the wire (2) 7.2. Two.point'charges, Qs and Qe, with charges -16 X 107C and +4X 107C - respectively, are placed 3 m apart as shown in the diagram below. : | ‘ 7 | P sm gm | Ent =O NOC" The net electric field at point P due to the presence of theo point charges, is ZERO. . Determine the value of x, shown in the diagram. (5) [19]

Downloaded from Stanmorephysics.com QUESTION 8 (Start on a new page) re conducting an experiment to determine the emf (e) ang Grade 12 Physics learners a tery. They have access to an ammeter but do not haye 9 internal resistance (r) of a bat voltmeter. They setup. ircuit shown in the diagram below. (4) (K)o40 82 8.1 Define the term emf of a battery. (2) 8.2 State the purpose of placing the switch next to the 8 Q resistor. (2) The results of the experiment are shown in the table below. AMMETER READING Switch open 4A Switch closed 6A 8.3 i Use the results from the &xperiment to determine the: (use¢= I(R +r) 8.3.1 Internal resistance of the battery (5) 8.3.2 emfofthe battery (2)

Downloaded from Stanmorepitysics.com 8.4 8.5 LimpopoDoE/September 2023 Calculate the: 8.4.1 Power dissipated in the battery when the switch is closed (2) 8.4.2 ac? Energy dissipated in the bulb in 6 minutes when the switch is open (3) Ho © brightness of the bulb affected when the switch is opened? State onl HTER, DIMMER or NO CHANGE. Explain the answer. (3) [19] QUESTION 9 (Start on a new page) The following diagrams show two types of generators 9.1 9.2 Diagram X Diagram Y (1) Write down the energy conversion which takes place in a generator. Write down the type of generator represented by: 9.2.1 Diagram X (1) 9.2.2 Diagram Y

Physi 9.3 9.4 18 | Sciences/P1 ; ownloaded from Stanmoreiifysics.com State the difference between the two generators by referring to the components, shown in the diagrams, of which they consist. ( otential difference with root-mean- The generator in diagram Y produces a p square (' value of 220 V. 9.4.1 fine, in words, the term rms voltage. (2) 9.4.2 Calculate the peak (maximum) potential difference of the generator. (3) 9.4.3. Sketch a graph of potential difference-versus-time to indicate one full rotation of the coil. Clearly indicate the values of the following on the graph: ¢ The rms value * The peak potential difference (3) [13]

Downloaded from Stanmorajebysics.com QUESTION 10 (Start on a new Page) Ina mi aay effect experiment, the maximum kinetic energy of the photoelectrons ejected from a certain metal surface is 4,48 x 10-9 J. When the wavelength of the incident light_is, increased by 50%, the maximum kinetic energy decreases to 1.76 x 10° 10.1 Defi e term work function of a metal in words. (2) 10.2 Prove, by means of an appropriate calculation, that the work function of the cathode is 3,68 x 10° J. ®) 10.3 Hence find the initial wavelength of incident light. (2) 10.4 How does EACH of the following affect the maximum kinetic energy of the photoelectrons? (State only INCREASES, DECREASES or REMAINS THE SAME). 10.4.1 Using incident light of shorter wavelength (1) 10.4.2 Using a photocathode with a higher work function (1) 10.4.3 Using incident light of greater intensity (1) [13] GRAND TOTAL: [150]

Downloaded from Stanmorephysics.com NATIONAL SENIOR CERTIFICATE These Errata marking guidelines consist of 6 pages. Copyright reserved please turn over

Douslcasiedirfirom Stanmorephysics.com Limpopo DoE/September 2023 Errata Marking Guidelines QUESTION 1 1.10 Accept: letter S QUESTION 2 2:14 The force fl ppose the motion” of a moving object relative to the surface.” (2) 212: Marks allocation Fret = ma Any onev mgsin@ - [x mgcos@ = m (2)(9,8)(sin 30°)¥ — (0,20)(2)(9,8)(cos 30°) ¥= (2)-av <a = 3,20259 m:s* (3,20 m-s)downhill¥ (2) 2.2 OPTION 1: OPTION 2: : 35 Mark awarded for Factor tay= my Gm4m = PY m F g(inner walls) = ae 2 ~ ; _ Gmym2 y Fg(inner walls) = (2 Gm4m. Fg(inner walls) = 1 ev zt) Gm4m. Fog(inner walls) = = 2y Zr = 95 (Smim2 = 25 ( (nH? ) (4) Copyright reserved please turn over

Dowslsasiedrfirom Stanmorephysics.com Limpopo DoE/September 2023 Errata Marking Guidelines QUESTION 3 orl Accept: An object upon which the only force acting is the gravitational force. 3.2.1 OPTION cal OPTION 3: INO AT _ (Ve Marks allocation: Ay= 3 (ee + *) (50) = At -.At=2,997s or At = (3,00 s) st = 2,997 s¥(3,00 s) 3.2.2 | POSITIVE MARKING FROM 3.2.1 At = 2,997 — 1 = 1,997 sv At = 3,00 — 1 = 2,00 sv 3.2.3 POSITIVE MARKING FROM 3.2.2 FOR: At=2,00s Ay = viAt + 3a (At)? 50 = vi(2) + (9,8)(2)? “Vi = 15,20 mst Copyright reserved please turn over

Posusloadesd)rirom Stanmorephysics.com Limpopo DoE/September 2023 Errata Marking Guidelines QUESTION 4 4.3.1 Marks allocation: OPTION 1 OPTION 2: Fret = ma Any onev’ f= uKN | ny onev -fk = ma =yKmg -uxN = ma (0,2)(0,005 + 3)v (9,8) ~(0,20)(0,005 + 3)v (9,8) =(0,005+3)av “a =-1,96 m-s? ve = vi2 + 2aAx¥ (0)? = vi? + 2(-1,96)(0,25) Vv Vi = 0,98995 ms (0,99 m:s")¥ Fx = 5,8898 N, westwards Wnet = AEKY fkAxcos0 = ; m (v?-v?) (5,8898)(0,25) v'cos180°= = (3,00) (0?-v?)v Vi = 0,99 m:s"', eastwardsY 4.3.2 Marks allocation: POSITIVE MARKING FROM 4.3.1 Xp, ==Zp, MpVb,+MgVp,= (Mp - Mg) V1 ny oneY (0,005)v, +(3)(0) = (0,005+3)(0,98995)” Vp,= 594,96 m-s"' Eastwards. ¥ QUESTION 5 5.2 OPTION 1 and 2: Consider m = 120 kg: w = FAycos@ Any one¥ Ww = mgAycos@ = (120)(98)cos180°V = -7996,80 Jv Copyright reserved please turn over (6) (4)

Bowileadedpirom Stanmorephysics.com Limpopo DoE/September 2023 Errata Marking Guidelines §:3 POSITIVE — 5.2 OPTION 2: an? OPTION 3: OPTION 4: Consider mass = 120 kg: (m = 120 kg) Fnet = ma = 0 Fret = ma = 0 Wmotor+(120)(9,8)-(100)(9,8) = 0 Whet = AExY Wmotor + 6664 - (8330) =0 Wmotor + Fmp + (-Fioad) = 0 ¥ Womotor+(125)(9,8)”—-(100)(9,8)¥=0 Fmotor = 196 N Womotor = 1332,80 J Fmotor = 245 N Nae — A 6.8 pow _ ax ~ 0,01 At Vave = 77 = 680 m-s” _ 1332,80 - 68 / 0,01 0,01 Pave = FVave = 680 m-s? = (196)(680) = 1332 80 W = 1332 80 W Pave = FVave = (245)(680) = 166600 WY QUESTION 6 6.1.2 OPTION 2: OPTION 3: OPTION 4: For calculating vs: ve = vi + 2Zady FnetAt = Ap ' =(0)? + 2(9,8)(15,0 mg-At = m(Vj - VF) ay= (“*)at (OF * 2081.0) | 6'8y1,7496) = vi -0 2, vi= 14 m-s* vi= 14 m-s™ Vi 15,0= (78) 1,7496)0 vi = 14 m-s" 6.1.3 Bullet 3: Frequency heard by the listener decreases. Copyright reserved please turn over

Posusloadesd)rirom Stanmorephysics.com Limpopo DoE/September 2023 Errata Marking Guidelines QUESTION 7 7.1.3 k=9x10° 7.1.4 POSITIVEJMARKING FROM 7.1.3 OPTION 3: lan Fe w= mg = (8 x 102)(9,8) w= 0,764.N Copyright reserved please turn over