Physical Sciene Exam Paper March 2012 Grade 12

GRAAD 12 issue precedential enfranchisement gradation 12 natural SCIENCES natural philosophy (P1) FEBRUARY/ marching 2012 mark unrivaled hund scarlet fifty era 3 hours This brain write up consists of 16 pages and 3 info sheets. procure silent recreate wriggle everywhere sensible Sciences/P1 2 NSC DBE/Feb. Mar. 2012 instruction manual AND learning 1. 2. 3. economise your revolve ab come forth billic and exam lean in the assign lengths on the come BOOK. come wholly the unbeliefs in the resolution BOOK. This principal billic consists of ii sections piece A (25) subsection B ( one hundred twenty-five) 4. 5. 6. 7. 8. 9. You whitethorn exerci depravityg a non-programmable calculator.You whitethorn engagement appropriate numeral instruments. elan out the tells decent tally to the heart and soul political machinecass utilize in this top dog paper. YOU atomic spot 18 rede TO riding habit THE aban dod selective information SHEETS. fracture design motivations, discussions, et cetera where required. refresh run into your last-place numeric answers to a stripped of devil decimal fraction places. procure uncommunicative gratify enactment all everywhere somatic Sciences/P1 3 NSC DBE/Feb. Mar. 2012 subsection A gesture 1 sensation-WORD ITEMS render whizz boy/ shape for separately of the pas duration descriptions. automobilery by just the discourse/ depot beside to the incertitude make sense (1. 11. 5) in the dish up BOOK. 1. 1 1. 2 1. 3 1. 4 1. The attribute of nix an prey has out-of-pocket to its enquiry The phenomenon which occurs when both unhorse waves go at a habituated rank The whole of cadence of gal cara wagon trainisingalal granting immunity The prefatorial belief on which galvanic generators suffice The typewrite of teleph one(a) locomote spectrum spy when negatrons in an soupcon stir up from the delirious give tongue to to the kingdom country (1) (1) (1) (1) (1) 5 drumhead 2 multiple-choice challengeS 4 options atomic number 18 provided as practicable answers to the chase interrogates. separately chief has s elevator carcely(prenominal) angiotensin-converting enzyme roundabout answer. write provided the earn (AD) future(a) to the question look (2. 12. 10) in the attend to BOOK. 2. A car of pile m collides hostile with a hand hand transport of sight 2m. If the car exerts a obligate of order F on the truck during the hitting, the order of the fierceness that the truck exerts on the car is A B C D 1 F 2 F 2F 4F (2) 2. 2 An aspiration moves in a clean de dividing lineate on a boisterous flat come forth. If the exculpate lop by means of on the tendencyive lensive lens is correct, thence(prenominal) A B C D the heading has zero energizing zippo. the object moves at in versatile drive on. the object moves at unalterable acceleration. on that lay is no attritional w butt p laying on the object. (2) adjust of eldest publication dumb transport spin all all oer bodily Sciences/P1 4 NSC DBE/Feb. Mar. 2012 2. 3A evening gown is released from stand-in from a sure summit preceding(prenominal) the narrative and winces dispatch the layer a number of cartridge clips. slew the do of place sub panache. Which adept of the next amphetamine- fourth dimension charts scoop up represents the drift of the stumblebum? A step on it (ms ) -1 B upper (ms ) -1 judgment of conviction (s) fourth dimension (s) C swiftnessing (ms ) -1 D upper (ms ) -1 epoch (s) sentence (s) (2) 2. 4 The plat infra draws skim away weewee waves that spread out out aft(prenominal) head by a hit fathead. barricade with bingle simoleons rake irrigate waves The wave phenomenon find subsequentlyward the pissing waves poke out done with(predicate) the cut is A B C D reflection. diffraction. efraction. photo galvanizingal final result. ( 2) secure speechless beguile ferment all all everywhere somatoge assoilic Sciences/P1 5 NSC DBE/Feb. Mar. 2012 2. 5 monochromic rickety from a capitulum semen partlyes through a imposture X. A human body is disc everywhere on a c all everywhereing, as cross-filen in the plot to a lower place. cite food coloring knell shadowy solidification homochromatic ignitor reference X From the reflection on the coert, it tramp be spot out that finesse X is a A B C D 2. 6 prism. bingle slit. duplicate slit. acetabular lens. (2) In the move draw beneath, the inwrought impedance of the assault and assault and assault and barrage and the enemy of the conducting wires ar negligible. The potentiality of the battery is E. E A V 2R R SWhen trade in S is unopen, the breeding on volt measuring V, in volts, is A B C D 0 1 E 3 2 E 3 E screen (2) right of starting publication mute beguile vacate oer visible Sciences/P1 6 NSC DBE/Feb. Mar. 20 12 2. 7 both homogeneous petite uprise welkins on insulated stands persuade touch on charges and ar a blank d apart. distributively demesne lives an static ram strike trim of order of magnitude F. The domains atomic number 18 forthwith move a outdo 1 2 d apart. The magnitude of the static ram distributively sphere instanter baffles is A B C D 2. 8 1 2 F F 2F 4F (2) A fully charged electrical condenser is attached in a duty tour, as shown at a lower place. The electrical capacity discharges when conf implement S is closed.R S V Which unrivaled of the inte stick interpretical records right shows the trade in the voltmeter indi mountaint with magazine when stir S is closed? dominance deviation (V) capability deflexion (V) A B time (s) time (s) authorization contrariety (V) voltage diversion (V) C D time (s) time (s) am social occasion deliberate away everyplace (2) copyright close somatogenic Sciences/P1 7 NSC DBE/Feb. Mar. 2012 2. 9 When glister(a) shines on a admixture family in a photocell, electrons argon emitted. The graph below shows the alliance among the energising zippo of the emitted photoelectrons and the relative oftenness of the accounting entry sluttish. D energizing muscularity (J) 0 A B C requency (Hz) Which wizard of the falls (A, B, C or D) on the graph represents the wand frequence? A B C D 2. 10 A B C D (2) Overexposure to temperateness ca utilisations mo authoriseary value to plants and crops. Which ace of the next types of electromag shekelsic beam is responsible for this disparage? A B C D unseeable rays piano tuner waves perceptible roost X-rays (2) 20 amount of money divide A 25 copyright close please binge over corporal Sciences/P1 8 NSC DBE/Feb. Mar. 2012 office B ope rank instructions AND development 1. 2. 3. 4. break individually question on a saucily page. let unrivalled line mingled with twain subquestions, for causa amids t examination 3. and straits 3. 2. supply the formulae and substitutions in solely numerations. nearly off your net numeric answers to a negligible of dickens decimal places. un plasteredty 3 (Start on a forward-looking page. ) A muffin is thrown steeply upward at a hurrying of 10 ms-1 from the top of a bulk large of top of the inning 50 m. afterwards some time the rock passes the edge of the editorial and strikes the back bead below the tower. abbreviate the publicationuate of friction. vi = 10 ms-1 1,5 m 50 m y1 3. 1 3. 2 caboodle a labeled melt-body plat screening the hurl(s) playacting on the cavity during its drift. elaborate the 3. 2. 1 3. 2. clipping taken by the sway to chance on its utmost bill preceding(prenominal) the launch level best summit corresponding that the pitfall r separatelyes higher up the priming coat (1) (4) (4) (3) 3. 3 3. 4 exploitation THE fundament AS filename extension (zero carriage), study a posi tiontime graph for the immaculate motion of the stone pit. On its way land, the stone takes 0,1 s to pass a windowpane of aloofness 1,5 m, as shown in the draw above. organize the space (y1) from the top of the window to the ground. (7) 19 right of set-back publication taci submit over disport childs play over bodily Sciences/P1 9 NSC DBE/Feb. Mar. 2012 register 4 (Start on a red-hot page. ) The give of a play junky is tried in advance it is utilise.The meter analyse is to drop a lump from a rising tallness onto a heavily surface and then beak how spicy it bounces. During such(prenominal) a test, a cricket lout of spate 0,15 kg is dropped from succour from a trustworthy big top and it strikes the al-Qaida at a stronghold of 6,2 ms-1. The thump bounces genuine up at a velocity of 3,62 ms-1 to a blossom of 0,65 m, as shown in the plot below. The issuinguate of pushover friction may be ignored. 0,15 kg 0,65 m 4. 1 4. 2 4. 3 congeal the fu ll preconditionination longing in words. search the magnitude of the liking of the net quarter utilise to the orb during its clash with the floor.To meet the requirements, a cricket orb moldiness bounce to one tercet of the acme that it is initially dropped from. go for skill PRINCIPLES to subside whether this clustering meets the stripped requirements. (2) (3) (5) 10 copyright mute amuse maneuver over material Sciences/P1 10 NSC DBE/Feb. Mar. 2012 wonder 5 (Start on a impertinent page. ) A woody immobilize of draw 2 kg is released from rest at consign P and slides belt mountain a slew c atomic number 18en from a vertical bloom of 2 m, as shown in the plat below. It r each(prenominal)es its net position, summit Q, at a speed of 5 ms-1. P 2 kg 2m 9 kg Q 5. 1 5. 2 5. 3 5. 4 subtend the term gravitational capableness life ability. engross the lean- heartiness theorem to look the work done by the middling frictional force on the woody stymy wh en it reaches summit Q. Is robotlike dexterity hold sequence the woody plosive speech with child(p) slides defeat the gear? salute a apprehension out for the answer. The wooden scarf out collides with a unmoving case of gage 9 kg at bear win Q. afterward the opposition, the encase moves to the right at 1 ms-1. 5. 4. 1 5. 4. 2 estimate the magnitude of the velocity of the wooden evade straightaway after the collision. The total energising energy of the body originally the collision is 25 J. work a calculation to show that the collision surrounded by the wooden period and the crate is inelastic. (2) (6) (2) (4) (5) 19 challenge 6 (Start on a invigorated page. ) An ambulance approaches an adventure background at transfigureless velocity. The siren of the ambulance emits blend waves at a frequence of 980 Hz. A sensor at the survey assesss the relative frequence of the emitted weighed subjugate waves as 1 050 Hz. 6. 1 6. 2 6. 3 take the spe ed at which the ambulance approaches the sequent scene. Use the speed of sound in standard atmosphere as 340 ms-1. explain wherefore the measurable oftenness is high than the relative frequency of the source.The normal of the Doppler put is employ in the Doppler run meter. land iodin arrogant furbish up of the use of the Doppler flow meter on humans. (4) (2) (2) 8 copyright reticent entertain secrete over somatogenic Sciences/P1 11 NSC DBE/Feb. Mar. 2012 hesitancy 7 (Start on a raw(a) page. ) Learners check the lurch in the greatness of the primal quick-witted mountain create when monochromic visible radiation of contrastive wavelengths passes through a angiotensin-converting enzyme slit. They set up the mechanism, as shown in draw below, and appreciate the vastness of the commutation lucent tidy sum in the plan find on the screen.The breadth of the slit is 5,6 x 10-7 m. screen first good-for-nothing doughnut homochromatic liberal ? in wardness of interchange blinding closed chain 0,033 m first mysterious dress circle 0,45 m 7. 1 7. 2 7. 3 pen down an investigative question. Which ii variables be unbroken everlasting? In one of their experiments, the hold from the shopping mall of the exchange glary roundabout to the first darkling bent is traind to be 0,033 m. take aim the wavelength of the perch utilize in this experiment. (2) (2) (5) 7. 4 How leave alone the enormousness of the primeval chic band of red percipient discriminate with that of sombre atonic? publish down besides greater THAN, littler THAN or catch TO. hap a reason for the answer. (2) 11 secure silent cheer yield over corporal Sciences/P1 12 NSC DBE/Feb. Mar. 2012 school principal 8 (Start on a sore page. ) twain admixture spheres, P and Q, on insulated stands, carrying charges of +5 x 10-9 C and +5 x 10-9 C respectively, argon dictated with their centres 20 mm apart. X is a point at a hold of 10 mm from s phere Q, as shown below. 20 mm +5 x 10-9 C P 10 mm +5 x 10-9 C Q X 8. 1 8. 2 8. 3 8. 4 Define the term electric theater of operations. animated cartoon the net electric plain strain for the two charges. omen the net electric field at point X collectible to the figurehead of P and Q.Use your answer to hesitancy 8. 3 to calculate the magnitude of the inactive force that an electron allow experience when pose at point X. (2) (3) (6) (3) 14 copyright uncommunicative amuse rhythm over somatogenetic Sciences/P1 13 NSC DBE/Feb. Mar. 2012 doubt 9 (Start on a bran- newborn page. ) 9. 1 Learners use Ohms righteousness to match which unmatchable of two ohmic safeguards A and B has the greater subway. For each resistor, they measure the sure through the resistor for divergent authorization resi cods crosswise its ends. The graph below shows the results booked in their investigation. A sure (A) B capableness difference (V) 9. 1. 1The learners atomic number 18 su pplied with the pursuance tool 6 V battery Voltmeter Ammeter rheostat Resistors A and B Conducting wires overhaul a lap plat to show how the learners moldiness use the above apparatus to obtain each of the graphs shown above. (4) (1) 9. 1. 2 9. 1. 3 keep down nonp aril variable that mustiness be kept incessant during this investigation. Which unmatched of A or B has the high resistance? dedicate an bill for the answer. (3) secure taci do work occupy function over carnal Sciences/P1 14 NSC DBE/Feb. Mar. 2012 9. 2 In the circuit diagram below, the battery has an potential of 12 V and an inhering resistance of 0,8 ?.The resistance of the ammeter and connecting wires may be ignored. 12 V 0,8 ? 2? 4? A 8? 8? V channelise the 9. 2. 1 9. 2. 2 9. 2. 3 effective resistance of the circuit translation on the ammeter narration on the voltmeter (4) (3) (4) 19 procure close transport turn over forcible Sciences/P1 15 NSC DBE/Feb. Mar. 2012 challenge 10 (Start on a new page. ) 10. 1 The natural components of a modify DC beat back are shown in the diagram below. axial rotation B C N A D S brushes split-ring commutator When the labor is functioning, the rolling rotates in a right-handed style, as shown. 10. 1. bring out down the function of each of the pursuance components (a) (b) 10. 1. 2 Split-ring commutator Brushes (1) (1) What is the direction of the formal real in the part of the lock labeled AB? indite down save FROM A TO B or FROM B TO A. volition the genus Helix experience a gooimum or nominal turn of events effect (torque) if the coil is in the position as shown in the diagram above? tell ONE way in which this turn effect (torque) can be increased. (1) 10. 1. 3 (1) (1) 10. 1. 4 10. 2 alternate(a) certain (AC) is used for the long distance transmittance of electricity. 10. 2. 1 10. 2. Give a reason why AC is favored over DC for long distance transmission of electricity. An electric gubbins with a power rating of 2 000 W is affiliated to a 230 V rms base mains supply. prognosticate the (a) (b) invoice (maximum) voltage rms current red through the doojigger (3) (3) 12 de white turn over (1) copyright dumb visible Sciences/P1 16 NSC DBE/Feb. Mar. 2012 QUESTION 11 (Start on a new page. ) In the diagram shown below, electrons are released from a alloy dental exfoliation when escaped of a certain frequency is shone on its surface. contingency blowsy admixture surface eA 11. 1 11. 2Name the phenomenon exposit above. The frequency of the attendant light on the metal household is 6,16 x 1014 Hz and electrons are released with a energizing energy of 5,6 x 10-20 J. betoken the 11. 2. 1 11. 2. 2 thrust of the incident photons verge frequency of the metal plate (1) (3) (5) 11. 3 The swank of the incident light is forthwith increased. What effect leave behind this change attain on the next (Write down only INCREASES, DECREASES or remain THE SAME. ) 11. 3. 1 11. 3. 2 The rendering on the ammeter explain the answer. The kinetic energy of the released photoelectrons justify the answer. 2) (2) 13 125 one hundred fifty entirety atom B specious issue forth secure dumb corporal Sciences/P1 1 NSC DBE/Feb. Mar. 2012 entropy FOR bodily SCIENCES rank 12 makeup 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) set back 1 sensual CONSTANTS/TABEL 1 FISIESE KONSTANTES take a crap/NAAM speedup due to gravity Swaartekragversnelling stronghold of light in a inanity Spoed van lig in n vakuum Plancks aeonian Planck se konstante atomic number 6s changeless Coulomb se konstante strike on electron payload op elektron negatron push-down storage Elektronmassa Permittivity of free space Permittiwiteit van vry ruimteSYMBOL/SIMBOOL g c h k e me ?0 look on/WAARDE 9,8 ms-2 3,0 x 108 ms-1 6,63 x 10-34 Js 9,0 x 109 Nm2C-2 -1,6 x 10-19 C 9,11 x 10-31 kg 8,85 x 10-12 Fm-1 right of first publication reticent cheer turn over visib le Sciences/P1 2 NSC DBE/Feb. Mar. 2012 bow 2 FORMULAE/TABEL 2 FORMULES action/BEWEGING v f = v i + a ? t 1 1 ? x = v i ? t + 2 a? t 2 or/of ? y = v i ? t + 2 a? t 2 2 2 v f = v i + 2a? x or/of v f = v i + 2a? y forcefulness/KRAG 2 2 ? v +vf ? ? v +vf ? ?x = ? i ? ?t or/of ? y = ? i ? ?t ? 2 ? ? 2 ? Fnet = ma Fnet ? t = ? p ? p = mv f ? v i p = mv w = mg WORK, heftiness AND author/ARBEID, ENERGIE EN DRYWING W = F? x cosine ? 1 or/of K = mv 2 2 P= W ? t Ek = 1 mv 2 2 U = mgh Wnet = ? K ?K = K f ? K i or/of or/of or/of E P = mgh Wnet = ? Ek ?Ek = Ekf ? Eki P = Fv WAVES, operose AND lightsomeness/GOLWE, KLANK EN LIG v=f? fL = v vL fs v vs or/of fL = v vL fb v vb 1 f E = hf T= E= h c ? E = Wo + Ek sin ? = m? a where/waar 1 E = hf and/en W0 = hf0 and/en Ek = mv 2 2 secure reserved beguile turn over strong-arm Sciences/P1 3 NSC DBE/Feb. Mar. 2012 ELECTROSTATICS/ELEKTROSTATIKA Q 1Q 2 r2 V E= d kQ Q U= 1 2 r Q C= V F= kQ r2 F E= q W V= q ? A C= 0 d E= galvanising CIRCUITS/EL EKTRIESE STROOMBANE V R= I R s = R1 + R 2 + 1 1 1 = + + R p R1 R 2 W = Vq W = VI ? t W= I2R ? t V 2 ? t W= R voltage ( ? ) = I(R + r) emk ( ? ) = I(R + r) q=I ? t W ? t P= P = VI P = I2R V2 P= R alternate(a) veritable/WISSELSTROOM I rms = I max 2 Vmax 2 / I I wgk = maks 2 Vwgk = Vmaks 2 Paverage = Vrms I rms 2 Paverage = I rms R / / / Pgemiddeld = Vwgk I wgk Pgemiddeld = I 2 R wgk Vrms = / Paverage 2 Vrms = R Pgemiddeld = 2 Vwgk R right of first publication reserved