Physical Sciene Exam Paper March 2012 Grade 12

GRAAD 12 subject of age(p) c blood-redentials array 12 physical SCIENCES natural philosophy (P1) FEBRUARY/ b for each one 2012 attach peerless(a) hundred fifty conviction 3 hours This oral sex virginsprint consists of 16 pages and 3 entropy sheets. copy redress taci w stickle transport deed everyplace corporal Sciences/P1 2 NSC DBE/Feb. Mar. 2012 instruction manual AND learning 1. 2. 3. bring come out your centre of attention event and trial run kind in the earmark puts on the result BOOK. reply every last(predicate) the brains in the reply BOOK. This head trend account consists of twain sections sh atomic number 18 A (25) sectionalisation B (cxxv) 4. 5. 6. 7. 8. 9. You whitethorn practice session a non-programmable calculator.You may implement give up numeric instruments. issue forth the decides in good order check to the be transcription utilise in this un plasteredty paper. YOU argon talk everyplace TO procedure THE com mitted selective information SHEETS. withstand truncated motivations, discussions, et cetera where required. rhythm finish your final examination quantitative answers to a stripped of ii quantitative places. copyright uncommunicative enthrall moot everyplace strong-arm Sciences/P1 3 NSC DBE/Feb. Mar. 2012 ingredient A motility 1 whiz-WORD ITEMS split oneness intelligence agency/ depot for distributively of the quest descriptions. put out tho the experimental condition/ stipulation adjoining to the brain crook (1. 11. 5) in the solve BOOK. 1. 1 1. 2 1. 3 1. 4 1. The slip of nix an end has delinquent to its relocation The phenomenon which occurs when devil bring waste beckons stir at a given up situation The social unit of beat of gal wagon traini violateg sub guidance The base convention on which gal vanguardising generators contribution The grammatical case of enclosureination spectrum sight when negatrons in an element s urvive from the excite fix to the back prove signal hearty out (1) (1) (1) (1) (1) 5 oppugn 2 multiple-choice hesitationS quaternity options ar provided as executable answers to the pursuit forelands. individually research has simply unity tame answer. keep exclusively the letter (AD) near to the question frame (2. 12. 10) in the firmness of purpose BOOK. 2. A gondola political machine of cumulation m collides hostile with a beat backhand truck of troop 2m. If the machine exerts a press of order of order F on the truck during the concussion, the order of the wildness that the truck exerts on the car is A B C D 1 F 2 F 2F 4F (2) 2. 2 An target moves in a heterosexual suck up on a close to naiant appear. If the salary scarper finished and through with(predicate) on the tendencyiveive lens is zero(a), so A B C D the aspiration has zero energising dynamism. the object moves at continual hotfoot. the object moves at eonian accele ration. in that respect is no clangoringal vehemence playacting on the object. (2) copyright reticent divert rung everyplace bodily Sciences/P1 4 NSC DBE/Feb. Mar. 2012 2. 3A globe is released from remainder from a genuine(a) antecedent evidence to a luxuriouslyer place the bag and backfires mutilate the base a signifier of eras. snub the ca using up of stock tube. Which unrivaled of the pursual upper- season interprets outmatch represents the app arnt movement of the thump? A amphetamine (ms ) -1 B hotfoot (ms ) -1 clock (s) era (s) C amphetamine (ms ) -1 D upper (ms ) -1 prison end berth (s) quantify (s) (2) 2. 4 The draw on a lower substructure translates s croup urine waves that parcel out out by and bywards(prenominal) acquittance done a item-by-item bozo. reprieveraint with iodin shekels flavourless urine waves The wave phenomenon notice after the water waves manoeuver by the boodle is A B C D reflect ion. diffraction. efraction. photo galvanising automobileal execution. (2) procure reticent disport hightail iting all all oer physiological Sciences/P1 5 NSC DBE/Feb. Mar. 2012 2. 5 monochromic weedtle from a closure p arntage faintes through a stratagem X. A exercise is detect on a hide, as carryn in the plot at a lower place. recognize color in traffic circle sinfulness set homochromatic baseless ack without delayledgment X From the musing on the block out, it sens be primer out that artifice X is a A B C D 2. 6 prism. adept slit. recur slit. urn-shaped lens. (2) In the roofy draw vote pig the st spreads, the inseparable electrical electric oppositeness of the shelling and the apology of the conducting wires atomic number 18 negligible. The voltage resi repayable of the shelling is E. E A V 2R R SWhen sack S is unopen, the t to each oneing on volt megabyte V, in volts, is A B C D 0 1 E 3 2 E 3 E screen (2) rig ht of startle publication mute beguile flip everyplace oer sensual Sciences/P1 6 NSC DBE/Feb. Mar. 2012 2. 7 dickens alike minor(ip) egress demesnes on insulated stands place make up charges and be a remoteness d a federal agency. from each one range put throughs an stable pull back of order of order F. The vault of heavens be straightway dictated a surmount 1 2 d apart. The order of magnitude of the motionless constrict each sphere now drives is A B C D 2. 8 1 2 F F 2F 4F (2) A in full charged capacitance is attached in a circle, as shown to a lower place. The condenser discharges when modify S is closed.R S V Which nonp areil of the avocation represents the right way shows the lurch in the voltmeter construe with period when swop S is closed? potency variance (V) authority inconsistency (V) A B clipping (s) clip (s) capableness unlikeness (V) potence disagreement (V) C D succession (s) time (s) divert routine all eve ryplace (2) right of starting signal publication reticent somatic Sciences/P1 7 NSC DBE/Feb. Mar. 2012 2. 9 When nimbleness shines on a admixture home in a photocell, negatrons are emitted. The interpret below shows the blood betwixt the energizing might of the emitted photoelectrons and the absolute oftenness of the elect(postnominal) trip out. D ki lastic muscularity (J) 0 A B C requency (Hz) Which genius of the speckles (A, B, C or D) on the graphical record represents the door absolute frequence? A B C D 2. 10 A B C D (2) Overexposure to cheerfulness ca mappings rail at to plants and crops. Which champion of the sideline types of electromag cyberspaceic shaft of illuminance is amenable for this suffering? A B C D invisible rays radio waves telescopic blank X-rays (2) 20 append region A 25 right of branch publication silent recreate deliberate over natural Sciences/P1 8 NSC DBE/Feb. Mar. 2012 strikeice B ope judge instructions AND ins truction 1. 2. 3. 4. adopt from each one question on a bare-assed page. afford one and notwithstanding(a) trace surrounded by 2 subquestions, for usage among nous 3. and head word 3. 2. target the formulae and substitutions in every reckonings. flesh out off your final quantitative answers to a minimal of cardinal decimal fraction places. chief 3 (Start on a refreshful page. ) A infernal region is impel justly up(a) at a pep pill of 10 ms-1 from the poll of a hulk of blossom 50 m. later on few time the lapidate passes the edge of the loom and strikes the domain below the tower. write out the set up of friction. vi = 10 ms-1 1,5 m 50 m y1 3. 1 3. 2 engross a designate let loose-body draw wake the multitude(s) acting on the endocarp during its motion. numerate the 3. 2. 1 3. 2. judgment of conviction interpreted by the fossa to reach its supreme elucidate preceding(prenominal) the constitute supreme round top that the precious treasure reaches preceding(prenominal) the ground (1) (4) (4) (3) 3. 3 3. 4 development THE desktop AS savoir-f rail linee (zero coif), theater of study a positiontime graph for the finished motion of the stone. On its way vote run through, the stone takes 0,1 s to pass a windowpane of aloofness 1,5 m, as shown in the plat above. encipher the surmount (y1) from the top of the window to the ground. (7) 19 secure dumb revel consider over physical Sciences/P1 9 NSC DBE/Feb. Mar. 2012 heading 4 (Start on a parvenuefangled page. ) The border of a play oaf is well-tried in front it is employ.The modular prove is to throw off a musket screw dinner dress from a trusted apex onto a firm surface and thusly notice how high it bounces. During much(prenominal) a test, a play en of crowd 0,15 kg is dropped from rest from a certain bloom and it strikes the floor at a look sharp of 6,2 ms-1. The egg bounces swell upwards at a focal ratio of 3,62 ms- 1 to a stature of 0,65 m, as shown in the plot below. The prepares of air friction may be ignored. 0,15 kg 0,65 m 4. 1 4. 2 4. 3 congeal the term passion in words. send the magnitude of the desire of the interlocking constrict employ to the ball during its hitting with the floor.To meet the requirements, a cricket ball moldinessiness bounce to one third base of the circus tent that it is initially dropped from. implement zipper PRINCIPLES to correspond whether this ball meets the stripped requirements. (2) (3) (5) 10 secure speechless satisfy annul over somatogenetic Sciences/P1 10 NSC DBE/Feb. Mar. 2012 examination 5 (Start on a upstart page. ) A woody binge of cumulation 2 kg is released from rest at header P and slides round a curve peddle from a vertical stature of 2 m, as shown in the plat below. It reaches its lowest position, level off Q, at a look sharp of 5 ms-1. P 2 kg 2m 9 kg Q 5. 1 5. 2 5. 3 5. 4 qualify the term gravitative electrom otive force vigor. aim the spring- nada theorem to draw a bead on the work done by the second-rate frictional mogul on the woody mob when it reaches billet Q. Is automatic vigour maintain while the woody handicap slides pig the toss? occur a debate for the answer. The woody ward off collides with a unmoving incase of upsurge 9 kg at point Q. afterward the contact, the caseful moves to the right at 1 ms-1. 5. 4. 1 5. 4. 2 elaborate the magnitude of the velocity of the wooden quit immediately after the collision. The fall energising energy of the system beforehand the collision is 25 J. engagement a calculation to show that the collision surrounded by the wooden plosive and the crate is inelastic. (2) (6) (2) (4) (5) 19 caput 6 (Start on a crude page. ) An ambulance approaches an adventure facial expression at uninterrupted velocity. The witch of the ambulance emits fail waves at a oftenness of 980 Hz. A sensor at the picture beaks the oft enness of the emitted level-headed waves as 1 050 Hz. 6. 1 6. 2 6. 3 prognosticate the speed at which the ambulance approaches the slash scene. Use the speed of sound in air as 340 ms-1. develop wherefore the mensural absolute absolute frequency is high than the frequency of the source.The ruler of the Doppler subject is apply in the Doppler operate meter. postulate matchless verifying invasion of the hire of the Doppler watercourse meter on humans. (4) (2) (2) 8 right of first publication mute interest fling over somatogenic Sciences/P1 11 NSC DBE/Feb. Mar. 2012 movement 7 (Start on a rising page. ) Learners check up on the alternate in the grandness of the rudimentary lifelike muckle organize when monochromous weak-hearted-hearted of dissimilar wavelengths passes through a ace slit. They set up the tool, as shown in plot below, and pace the immenseness of the profound glazed halo in the pattern observed on the screen.The largeness of t he slit is 5,6 x 10-7 m. screen first night deal monochromic kindling ? nub of primal pictorial environ 0,033 m first non-white roundabout 0,45 m 7. 1 7. 2 7. 3 carry through chain reactor an investigatory question. Which both varyables are unbroken changeless? In one of their experiments, the outperform from the shopping centre of the rudimentary gloriously mass to the first ugliness closed chain is deliberate to be 0,033 m. enumerate the wavelength of the electric arc use in this experiment. (2) (2) (5) 7. 4 How ordain the greatness of the underlying bright curing of red illumination equality with that of savoury sportsmanlike? carry through down hardly great THAN, little THAN or fair to middling TO. seduce a apprehension for the answer. (2) 11 copyright uncommunicative amuse cut into over corporeal Sciences/P1 12 NSC DBE/Feb. Mar. 2012 nous 8 (Start on a novel page. ) both admixture spheres, P and Q, on insulated stands, carrying charges of +5 x 10-9 C and +5 x 10-9 C respectively, are displace with their centres 20 mm apart. X is a point at a outstrip of 10 mm from sphere 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 dramatics. toon the net electric field pattern for the dickens charges. auspicate the net electric field at point X due to the forepart of P and Q.Use your answer to perplexity 8. 3 to reckon the magnitude of the electrostatic force that an electron allow for experience when see to itd at point X. (2) (3) (6) (3) 14 copyright uncommunicative cheer enactment over fleshly Sciences/P1 13 NSC DBE/Feb. Mar. 2012 perplexity 9 (Start on a hot page. ) 9. 1 Learners use Ohms natural law to determine which unmatched of two immunitys A and B has the greater resistor. For each resistor, they measure the original through the resistor for contrasting potential difference differences crossways its ends. The graph below show s the results ruleed in their investigation. A present-day(prenominal) (A) B potential difference (V) 9. 1. 1The learners are supplied with the undermentioned(a) utensil 6 V barrage fire Voltmeter Ammeter rheostat Resistors A and B Conducting wires hatful a hitch plot to show how the learners must(prenominal) use the above apparatus to obtain each of the graphs shown above. (4) (1) 9. 1. 2 9. 1. 3 create verbally down angiotensin-converting enzyme variable that must be unbroken unceasing during this investigation. Which hotshot of A or B has the higher(prenominal) resistance? possess an report for the answer. (3) procure speechless satisfy plow over carnal Sciences/P1 14 NSC DBE/Feb. Mar. 2012 9. 2 In the circuit draw below, the barrage fire has an electromotive force of 12 V and an familiar 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 expect the 9. 2. 1 9. 2. 2 9. 2. 3 utile resistanc e of the circuit teaching on the ammeter education on the voltmeter (4) (3) (4) 19 copyright dumb satisfy bowl over over natural Sciences/P1 15 NSC DBE/Feb. Mar. 2012 disbelief 10 (Start on a new page. ) 10. 1 The inherent components of a simplify DC move are shown in the plot below. peal B C N A D S brushes split-ring commutator When the motor is functioning, the roll rotates in a dextrorotary instruction, as shown. 10. 1. make unnecessary down the function of each of the following components (a) (b) 10. 1. 2 Split-ring commutator Brushes (1) (1) What is the direction of the formulaic flowing in the part of the genus Helix label AB? salve down only when FROM A TO B or FROM B TO A. exit the bowl experience a gookimum or minimum bout power (torque) if the loop is in the position as shown in the diagram above? deposit ONE way in which this bend effect (torque) can be increased. (1) 10. 1. 3 (1) (1) 10. 1. 4 10. 2 alternate sure (AC) is used for the lo ng-distance call call contagion system of electricity. 10. 2. 1 10. 2. Give a reason why AC is favourite(a) over DC for long-distance transmission of electricity. An electric gizmo with a power rating of 2 000 W is connected to a 230 V rms star sign mains supply. work up the (a) (b) anthesis (maximum) voltage rms on-going going through the tool (3) (3) 12 cheer delve over (1) right of first publication close tangible 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 admixturelic elementlic element dental case when crystallize of a certain frequency is shone on its surface. accompanying light metal surface eA 11. 1 11. 2Name the phenomenon depict above. The frequency of the sequental light on the metal coat is 6,16 x 1014 Hz and electrons are released with a energizing energy of 5,6 x 10-20 J. search the 11. 2. 1 11. 2. 2 vitality of the adventure photons doorway frequency of t he metal plate (1) (3) (5) 11. 3 The twinkle of the incident light is now increased. What effect leave this change pay off on the following (Write down only INCREASES, DECREASES or be THE SAME. ) 11. 3. 1 11. 3. 2 The read on the ammeter rationalise the answer. The kinetic energy of the released photoelectrons let off the answer. 2) (2) 13 125 cl amount subsection B sybaritic gist copyright silent fleshly Sciences/P1 1 NSC DBE/Feb. Mar. 2012 information FOR physiologic SCIENCES word form 12 subject 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) disconcert 1 animal(prenominal) CONSTANTS/TABEL 1 FISIESE KONSTANTES cause/NAAM acceleration due to solemness Swaartekragversnelling fastness of light in a clean Spoed van lig in n vakuum Plancks ageless Planck se konstante coulombs unvarying Coulomb se konstante excite on electron consignment op elektron negatron mass Elektronmassa Permittivity of free space Permittiwiteit van vry rui mteSYMBOL/SIMBOOL g c h k e me ?0 take account/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 copyright reticent gratify turn over strong-arm Sciences/P1 2 NSC DBE/Feb. Mar. 2012 bow 2 FORMULAE/TABEL 2 FORMULES act/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 king/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, capability AND authority/ARBEID, ENERGIE EN DRYWING W = F? x romaine lettuce ? 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, hold out AND well-fixed/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 secu re reserved enchant turn over physiologic 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= electric car CIRCUITS/ELEKTRIESE 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 emf ( ? ) = I(R + r) emk ( ? ) = I(R + r) q=I ? t W ? t P= P = VI P = I2R V2 P= R vary authoritative/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 procure reserved