Physical Sciences Grade 12 P1 KZN Mock 2023 Paper & Memo

Downloaded from Stanmorephysics.com * KWAZULU-NATAL PROVINCE EDUCATION REPUBLIC OF SOUTH AFRICA GRADE 12 NATIONAI SENIOR CERTIFICATE SSS SRS SESE R RKTT ETE E, SSSSESSEEEEES, a ry a : . ry / be . 1 . . a # : A o ° Hi be * af SSeeeeeessesess® MARKS : 150 TIME : 3Hours This question paper consists of 16 pages and 3 data sheets. Copyright reserved Please turn over

Physica eunlogded from Stanmorephysic 2 's.com ? September 2023 Preparatory Examination NSC INSTRUCTIONS AND INFORMATION 1. = 10. 11. 12. Write your NAME in the appropriate spaces on the ANSWER BOOK. This que; tion paper consists 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 between two subquestions, for example between QUESTION 2.1 and QUESTION 2.2. You may use a non-programmable calculator. You may use appropriate mathematical instruments. Show ALL formulae and substitutions in ALL calculations. Round off your final numerical answers to a minimum of TWO decimal places. Give brief motivations, discussions et cetera where required. You are advised to use the attached DATA SHEETS. Write neatly and legibly. Copyright Reserved Please turn over

Downloaded from Stanmorephysics. com Physical Sciences P1 September 2023 Preparatory Examination NSC 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) next to the question number (1.1-1.10) in the ANSWER BOOK, for example 1.11 D. 1.1 Whichio One of the following quantities is a measure of the inertia of a body? — ] A Mass B Net force c Velocity D Impulse (2) 1.2 A spaceship has weight X on Earth. It is sent into space and lands on a planet which has a mass twice that of Earth and a radius % that of Earth. The weight of the spaceship on the planet is... A 8X Mx c x D Mx (2) 1.3 A ball is dropped vertically downwards from rest and reaches a velocity v after it has travelled a distance y. What will be the magnitude of the velocity of the ball after it has travelled a distance 4y? (Ignore all effects of friction.) A My B v2v Cc 2v D 4v (2) Copyright reserved

Physical ByisnprdBaded from Stanmofephysivesteroereo23 Preparatory Examination 1.4 Two trolleys, X and Y, of masses 2m and m respectively, move to the right across a horizontal frictionless surface with a speed v. They are joined by means of a compressed spring. The trolleys are pushed apart when the spring is released and falls to the ground. The magnitude of the change in momentum of trolley X is p. What is the magnitudé ofthe change in momentum of trolley Y? Tn m Lo AZ + SO ae Compressed spring A <p B ; p Cc 2p D p (2) 1.5 A CONSERVATIVE FORCE is a force... A for which the work done in moving an object between two points is dependent on the path taken. B for which no work is done in moving an object between two points. c for which the work done in moving an object between two points is independent of the path taken. D that always does negative work when an object moves between two points. (2) Copyright reserved

Piyeioerfkiendet? from Stanmorephysics . CSeiptember 2023 Preparatory Examination 1.6 Astronomers obtained the following spectral lines of an element: Spectrum of the element in a laboratory on Earth: Blue Red dann] Spectrum of the element from a distant star: Blue Red zee E From this it can be concluded that the ... star is moving closer towards Earth. Earth is moving towards the stationary star. temperature of Earth is increasing. 0 oOo DBD > star is moving away from Earth. (2) 17 The magnitude of an electric field at a distance r from a point charge is E. The magnitude of the electric field at a distance 2r from the same point charge will be ... A x : E B 4 ZF c 2E D 4E (2) Copyright reserved

Downloaded from Stanmorephysics.com Physical Sciences P14 September 2023 Preparatory Examination NSC 1.8 Three circuits with identical resistors and cells are shown in the diagram below. The cells have negligible internal resistance. V1 to Vs gives the magnitude of the potential difference across each resistor Va Vs Which ONE of the following statements is TRUE for the magnitude of the potential difference across the resistors? A Vi>V2=V3>Vs=Vs V2>V3>Vi > V4>V5 V2=V3>Vi > V4 =V5 Vi = V2 = V3 > Va = V5 (2) 1.8 A-simplified diagram of a generator is shown below. The arrows indicate the direction of the current in the coil. When viewed from where the rings are positioned, the coil ABCD is being rotated... A clockwise. B anticlockwise. c clockwise, reaches the vertical position and then reve! Ss direction. D anticlockwise, reaches the vertical position and then reverses its direction. (2) Copyright reserved

prreweloeded from Stanmorephysics.. Geptamber 2023 Preparatory Examination NSC 1.10 The photo-electric effect provides evidence that... A metals contain electrons. B light has a particle nature. Cc light has a wave nature. metals conduct electricity. (2) [20] QUESTION 2 Two blocks of mass M kg and 6 kg respectively are connected by a light, inextensible string. The string runs over a light, frictionless pulley. Initially, both blocks are held stationary, at the same height above the ground. When the blocks are released, the 6kg block accelerates downwards. M 6 kg GROUND The vertical distance between the blocks, ONE SECOND after they are released, is 1,96 m. 2.1. State Newton's Second Law of Motion in words. (2) 2.2 Drawa labelled free-body diagram showling all forces acting on the 6 kg block. (2) 2.3. Calculate the acceleration of the 6 kg block. (5) 2.4 lue of M by applying Newton's Second La ach of the j (5) 2.5 ing the blocks is now cut. What will be gnitude of the je M kg block? the answer (2) [16] Copyright reserved

wnloaded from Stan ore i Physical Sey Cue fi S we ae physi ‘ane 2023 Preparatory Examination QUESTION 3 A helicopter is moving vertically upwards at a constant speed of 8 m-s', When the helicopter is at height h metres above the ground a stone is dropped from the helicopter. The stone been je age height of 150 m above the ground. Zreauiie the motion of the stone from the instant it was dropped til it struck the ground. Ignore the effects of air resistance. Hi onapewan ; | Helicopter _ Stone | | ! | | 150m | h | | | | | | ‘ Ground 3.1 Give a reason why the stone is in free fai! after it was dropped from the helicopter. 3.2 What is the direction of the acceleration of the stone: 3.2.1 When the stone is at its maximum height 3.2.2 Immediately after the stone is dropped from the helicopter 3.3 Calculate: 3.3.1. The maximum height reached by the stone above the point from which it was dropped. 3.3.2 Height h. 3.4 Determine the time taken for the stone to reach the ground. laa? 3.5 Onthe same system of axes, draw a velocity vs time graph for the) ei and the helicopter from the instant the stone is dropped until it struck the pee Clearly show the following on your graph: Initial velocity for both the stone and the helicopter. e The time taken for the stone to reach the ground. Copyright reserved (2) (1) (1) (3) (1) (4) (4) [16]

Physonweateaged from Stanmorephysics - QsEmber 2023 Preparatory Examination NSC QUESTION 8. A battery with an unknown emf (e) and internal resistance (r) is connected in a circuit, as shown below. The ammeter and connecting wires have negligible resistance. V1 and V2 are high-resistance voltmeters @ fil Aor A Se fo} Pe 4Q 20 © When switch S; is closed and switch S2 is open, the ammeter reads 2,48 A. 8.1 Define the term emf of a battery. (2) 8.2 Calculate the: 8.2.1 reading on voltmeter V2 (4) 8.2.2 energy transferred to the 3Q resistor in 1,5 minutes (3) With BOTH switches S: and S2 closed, the ammeter reads 3,43 A. 8.3 How will the reading on the voltmeter, V:, be affected? Choose from INCREASES, DECREASES or REMAINS THE SAME? Explain the answer. (3) 8.4 Determine the emf of the battery. (5) = 8.5 The battery is now replaced with another battery that has thé ME emf but a GREATER internal resistance. How will the reading on V; lected when both switches are closed? Choose from INCREASES, DECREASES or REMAINS T! ME Explain the answer. (3) [20] Copyright reserved

Physica eed from StanmorgphysicseGeper 2023 Preparatory Examination NSC QUESTION 9. 9.1 The diagram below represents a simplified sketch of a DC electric motor. Split ring commutator 9.1.1 The coil rotates in a clockwise direction as indicated in the diagram above. What is the polarity of the pole of the battery labelled X? Choose from POSITIVE or NEGATIVE (2) 9.1.2 State the energy conversion that takes place in the electric motor. (2) 9.1.3. Name the component that ensures that the coil rotates continuously in ONE DIRECTION. (1) 9.1.4 Name the fundamental principle on which the motor work. (1) 9.2 Anelectrical device is marked 200 W ; 220 V. The 220 V refers to the rms voltage. 9.2.1 Define rms voltage. (2) 9.2.2 Calculate the resistance of the device. (3) [11] soar | Copyright reserved

Pipisevtderded from Stanmorephysics. Gemenber 2023 Preparatory Examination QUESTION 4 A 10 kg block travelling at 2 m:s*' to the right collides with a 2 kg block travelling at 4 m-s"' to the left as shown in the diagram below. The collision is ELASTIC. After the colli the 10 kg block has a velocity x m:s! and the 2 kg block has a velocity of y R Ignore the ef of friction. fore collision After collision 2m:s1 4 xm-st ——- 4m-s y ms" 10 kg 2kg 4.1 Explain what is mea an elastic collision. (2) 4.2 Determine the velocity of each block after the collision. (7) 19] Copyright reserved 2

Physical 2QWHlgaded from Stanmorephysics.com eptember 2023 Preparatory Examination NSC QUESTION 5 A 3 kg block slides at a constant velocity of 10 m-s* from point A to point B along a smooth horizontal surface. It then moves a distance of 4 m from point B to point C along a rough horizontal surface. The blockithen moves up a frictionless incline which makes an angle of 20° with the horizontal, as showin the diagram below. 10 m-s1 4 A B m The block moves a distance d up the incline before coming to rest at point D. 5.1. State the work-energy theorem in words. (2) The block passes point C with a speed of 3,5 m:s*. 5.2 Use ENERGY PRINCIPLES only to calculate the work done by the frictional force (4) 5.3 Draw a vector diagram to show all the forces acting on the block that are parallel to the incline, while the block is sliding from point C to point D. (1) 5.4 Using ENERGY PRINCIPLES only, calculate the distance d. (5) 5.5 Howwill the answer to QUESTION 5.4 be affected if the angle of the incline is now increased? Choose from INCREASES, DECREASES or REMAINS THE SAME (1) [13] Copyright reserved

Phypical SSE ed from Stanmorephysics. Bonn" 2023 Preparatory Examination QUESTION 6 An ambulance, with its siren on, is moving at a constant speed alon road towards a stationary detector. The detector registers sound wav of 450 Hz as the ambulance approaches it. As the ambulance mov: detector, the detector registers sound waves with a frequency of 385 HZ. a scsall enn l Assume that the‘Speed of sound in air is 340 ms. 6.1 State ie effect in words. (2) 6.2 Calculate: 6.2.1 The speed of the ambulance. (6) 6.2.2 The frequency of the sound waves emitted by the siren . (2) 6.3 Whatwill be the frequency of the sound waves heard by the driver of the ambulance? (1) [11] QUESTION 7 Three small identical metal spheres, X, Y and Z are mounted on insulated stands as shown. X carries a charge of +20nC, Y carries a charge of -8nC and Z is neutral. Xx Y z neutral 7.1 Give a reason why the metal spheres are mounted on insulated stands. (1) 7.2 Sphere X is first brought into contact with sphere Y. Sphere X; igmoved and then brought into contact with sphere Z, and then separated. 7.2.1. Calculate the net charge on each sphere after they are separated. (3) 7.2.2 Which of the three spheres undergoes a small net increase in mass? Give a reason for the answer. (2) Copyright reserved

Prysiceimtbaded from StanmorgphysicS Cort 2°25 Preparatory Examination 7.3 Three point charges, X, Y and Z of magnitudes +20 yC, -45 uC and +30 uC respectively are placed so that they form a right angle as shown below. X and Y are 600 mm apart, whilst Y and Z are 800 mm apart. __X +#20uC 7.3.1. State Coulomb's /aw in words. (2) 7.3.2 Calculate the magnitude of the net electrostatic force exerted on Y by X and Z. (5) Point charge Y is now removed. 7.3.3 Define electric field at a point. (2) 7.3.4 Calculate the magnitude of the net electric field at the original position of Y. (3) [18] Copyright reserved

pryauuueaded from Stanmorephysics.gom .., 2023 Preparatory Examination NSC QUESTION 8. A battery with an unknown emf (€) and internal resistance (r) is connected in a circuit, as shown below. The ammeter and connecting wires have negligible resistance. V1 and Vz are high-resistance voltmeters @ Si E HH or 5 Sz a Ss 40 20 foi nC) When switch S; is closed and switch Se is open, the ammeter reads 2,48 A. 8.1 Define the term emf of a battery. (2) 8.2 Calculate the: 8.2.1 reading on voltmeter V2 (4) 8.2.2 energy transferred to the 30 resistor in 1,5 minutes (3) With BOTH switches S: and S2 closed, the ammeter reads 3,43 A. 8.3 How will the reading on the voltmeter, V1, be affected? Choose from INCREASES, DECREASES or REMAINS THE SAME? Explain the answer. (3) 8.4 Determine the emf of the battery. (5) 8.5 The battery is now replaced with another battery that has the-SA GREATER internal resistance. How will the reading on V1 bé both switches are closed? Lamy Choose from INCREASES, DECREASES or REMAINS THE-SAME Explain the answer. (3) [20] Copyright reserved

PavsaiSeamttdaded from Stanmopéphysic$*eantt 2023 Preparatory Examination QUESTION 9. 9.1 The diagram below represents a simplified sketch of a DC electric motor. Split ring commutator 9.1.1 The coil rotates in a clockwise direction as indicated in the diagram above. What is the polarity of the pole of the battery labelled X? Choose from POSITIVE or NEGATIVE (2) 9.1.2 State the energy conversion that takes place in the electric motor. (2) 9.1.3 Name the component that ensures that the coil rotates continuously in ONE DIRECTION. (1) 9.1.4 Name the fundamental principle on which the motor work. (1) 9.2 Anelectrical device is marked 200 W ; 220 V. The 220 V refers to the rms voltage. 9.2.1 Define rms voltage. (2) 9.2.2 Calculate the resistance of the device. (3) [11] Copyright reserved

SOWNEAGed from Stanmorefipysics. SAT 223 Preparatory Examination QUESTION 10 The simplified diagram of a photocell below shows a metal plate that emits electrons when a certain frequency of electromagnetic radiation is incident on it. The metal plate has a work function of 7,57 x 10°19 J. Electromagnetic radiation Window Metal plate CL / S Evacuated tube NS _ | — Z| LJ 10.1 Define threshold frequency (2) 10.2 Light of wavelength 200 nm is incident on the metal plate. Determine the maximum speed of the released photo-electron. (6) 10.3 Electromagnetic radiation with a shorter wavelength but the same intensity is now used, What effect will this have on each of the following? (Choose from INCREASES, DECREASES or REMAINS THE SAME.) 10.3.1 The reading on the ammeter. Explain the answer (3) 10.3.2 The kinetic energy of the released photo-electrons. Give a reason for the answer (2) Copyright reserved

Physicarennalesded from Stanmorephysicssd@Mber 2023 Preparatory Examination NSC 10.4 Four emission lines P, Q, R and S in the hydrogen spectrum are shown in the diagram below. violete red P @Q R Ss The wavelengths of these four emission lines are given in the table below. EMISSION LINE WAVELENGTH (nm) P 410 Q 434 R 486 s 658 Which emission line is produced by the transition from the highest energy level to the ground state energy level? Explain the answer. (3) [16] TOTAL: 150 Copyright reserved

pryRawuraded from Stanmorephysics. GAKInver 2023 Preparatory Examination NSC DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) TABLE 1; PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES T NAMERAAM SYMBOL/SIMBOOL | VALUE/WAARDE teigude aden G 6,67 x 10" Nem*-kg? foal oll h 6,63x 10% Js poe igh rete k 90x 10°N-m?-C? a € 46x 10% at aoicn sen m, 9,11 x 10% kg posta Ml M 5,98 x 10" kg a hey Re 6,38 x 10° m Copyright reserved

PrysicpSoepmedded from StanmorgphysicSeC OH 2°29 Preparatory Examination TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING Vp =Vj +aat Ax =v, At+dadt? or/of Ay =v,At+jaat? ap Vi+Ve Vv, +V, XOnof v,? =v, +2ady | Ax= “(a tat oxtr ay = |aee aa Ve =vi+ FORCE/KRAG Fie =Mma = p=mv 1,°™ =p.N f, =U,N eee yt w-mg Fou oof F=G™ TE |g “Gu oof g -c4 WORK, ENERGY AND POWERIJARBEID, ENERGIE EN DRYWING W-=Faxcos6 U=mgh ofof Ep=mgh W,,=4K oof W,, = AE, AK=K,-K, ofof AE, =E, -E, Ww W,, = AK+4U of/of W,, =AE, +AE, a xe Wes =—mv orlof =—mv 2 6 2 Pay = Fav 1 Poyemia = FVgemia WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG 1 v=fr ae vv, vty c in f. f, =—_+ E=hf or/of E=h- f viv, * . vey, * a E=W, +E Of E=W, +K,, Where/waar 4 E=hf and/en W, =hf, and/en E, nsx) = 5 ax orlof K Copyright reserved

Phygival Soiphseated from Stanmorephysics.. cetsember 2023 Preparatory Examination ELECTROSTATICS/ELEKTROSTATIKA ee E=— ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE rv. emf (€)=1(R + r) emk (€ )=I(R +r) Ry =R, +R2 +... 1 1 1 q=rat BS "5b tp t+: R, R, R, W=Vq pow At W=VIat P=VI W=PRat suit P =FR w= v? = Pie ALTERNATING CURRENT/WISSELSTROOM , Pae=Vmelme 7 Pyenatas = Vics ug I, 2 ! lg 2 2 | Pre=BaR Prenat = gh V V, V_ == / Ve. 2 2 mts oe Pee iP — Copyright reserved

Downloaded from Stanmorephysics.com | KWAZULU-NATAL PROVINCE TION LIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE This Marking Guideline consists of 13 pag Copyright reserved Please turn over

Phybraventaacad from Stanmorephysics . G@ilamber 2023 Preparatory Examination NSC — Marking Guideline QUESTION 1: MULTIPLE-CHOICE QUESTIONS 1.1 AvY 1.2 AVY 1.3 Cv 1.4 Dvv 1.5 Cv 1.6 Dvv 1.7 Byy 1.8 Dvv 1.9 AVY 1.10 BYv [20] Copyright reserved

Phydpameoascke d from Stanmorephysics . G@slmber 2023 Preparatory Examination NSC — Marking Guideline QUESTION 2 2.1 Marking criteria If any of the underlined key words/phrases, in the correct context is omitted, deduct 1_mark. Phrases must be in the correct context. fésultant/net force acts on an object, the object will accelerate in the direction- ithe force. The acceleration is directly proportional to the resultant/net force veand inversely proportional to the mass of the object. “ 2.2 Tv Accepted Labels w Fo/ Fw/ weight/ mg/ gravitational force T Fr/ tension wy 2.3 Ay = viAt +% adt? ¥ 0.98 Vv = 0(1)+ %a(1)?v a = 1.96 m:s* downwards v” RKING FROM QUESTION 2.3 6(9.8) — T = 6(1.96) ¥ T=47.07N 4 kg block Fret = ma T-W=ma 47.07 — 9.8M V= 1.96 MY M = 4 (kg) ¥ 25 98m.s?v The block is in freefall. W OR The only force acting on the block is the force of gravity. Copyright reserved (2) (2) (5) (5) [16]

Phyo meeteascake cl from Stanmorephysics. Gé@#amber 2023 Preparatory Examination NSC — Marking Guideline QUESTION 3 3.1. Only the force of gravity acts on the object.v ¥ 3.2 3.2.1. Downwards.v 3.2.2. Downwards.v 3.3 3.3.1 OPTION 1: DOWNWARDS AS NEGATIVE: 2 2 Vv, =V, + 2ady O° = (8) + 2(-9,8)(Ay) V Ay = 3,27 mY DOWNWARDS AS POSITIVE: vy = vy, + 2aAy ¥ O° = (-8) + 2(+9,8)(Ay) ¥ Ay = -3,27 Ay = 3,27 mY OPTION 2: DOWNWARD AS NEGATIVE: ve = vy, + 2ahy ¥ (-8) = (0)" + 2(-9,8)(Ay) ¥ Ay = -3,27 Ay = 3,27 mY DOWNWARD AS POSITIVE: Ve = v, + 2ahy ¥ (8) = (0)° + 2(+9,8)(Ay) ¥ Ay = 3,27 Ay = 3,27 mv 3.3.2 h=150-3,27 =146,73 mv Copyright reserved (1) (1) (3) (1)

Prypowntoaded from Stanmorephy: ISICS. Gé@samber 2023 Preparatory Examination NSC — Marking Guideline 3.4 POSITIVE MARKING FROM QUESTION 3.3.2 DOWNWARDS AS NEGATIVE: Ay = v,Ate% abt v -146,73.W=|(8)At + % (-9,8)At =6,35sv DOWNWARDS AS POSITIVE: Ay =vAt+ alt ¥ 146,73 V= (-8)At + % (9,8)Ar ¥ =6.53sv 3.5 POSITIVE MARKING FROM 3.4 DOWNWARDS AS NEGATIVE: ums") Helicopter e (4) DOWNWARDS AS POSITIVE: v(m.s") Object rif ae a rs 6.83 Janrtts) Helicopter Copyright reserved (4)

Phydpamectocsate cl from Stanmorephysics. Gé#amber 2023 Preparatory Examination NSC — Marking Guideline Initial velocity for both graphs is 8 m.s” Both graphs stop at 6,53s For helicopter: Straight line parallel to the X-axis For object: Straight line above and below the X -axis <A < [16] QUESTION 4 4.1 | Marking criteria If any of the underlined key words/phrases, in the correct context is omitted, deduct 1 mark. Phrases must be in the correct context. Collision where the total kinetic energy Vand total momentum are conserved” (2) 4.2 Zp= 2p, my; +M,V; =M,V; +M,V, ¥ (10)(2) + (2)(-4) = (10)(x)+ (2)(y) ” y=6-5x... ...Equation 1. ZEx (before) ~ Eater) 1 1 1 1 =m? +=m,v? ==m,v, +=m,v; ¥ 2 2 2 2 S(ION2Y + (2)4)? v= 3 (40)x)? +S (2V(y)?v 36 =5x? Hy? Equation 2. Sub Equation 1 into Equation 2: 36 = 5x? +(6-5x)* 0 =30x? - 60x xX =Oor x#2 y=6-5(0) =6 X=Oms v¥ y=6m.s" to the right¥ (7) [9] Copyright reserved

Phydpameoascke d from Stanmorepnysics. Gé@#amber 2023 Preparatory Examination NSC — Marking Guideline QUESTION 5 5.1 Marking criteria If any of-the underlined key words/phrases, in the correct context is omitted, deduct /tmark. Phrases must be in the correct context. The NETwork done on an object is equal to the change in the object's_kinetic energy. vv7 5.2 OPTION 1: (2) Wret = AE, v W,+W, +, = 5m(v,?-v2) 0+0+W, = (8)(3.5" 102) vv Wr = -131,63 JY OPTION 2: W,, = AE, + AE, ¥ W, = Amiv?-v2}+mgth,-h) w, -5(3)3.5" 10?) vv +0 Wr =-131,63 Jv (4) 5.3 Fou v 5.4 OPTION 1 (Ey +E, drop = (Ey +E, )sottom) v 0+(3)(9,8)h+0¥= 0+ 4(3)(3,5/¥ 0+(3)(9,8) dsin20 v= 44 (3)(3,5)° d= 1,83 mv (5) Copyright reserved

Phydpameoascke d from Stanmorephysics . G@smber 2023 Preparatory Examination NSC — Marking Guideline OPTION 2 W,., = AE, ¥ W, +W, = m(V,? -V2) 0v+(3)(9; d= 1,83 cos110°= (0,5)(3)(0? - 3,57)” O= 5 my,’ -v/’)+mg(h, -h) ov = 4 (30? ~3,52) ¥+ (3)(9,8)(dsin20° —0) v d= 1,83 mv 5.5 Decreases (1) [13] QUESTION 6 6.1 | Marking criteria If any of the underlined key words/phrases, in the correct context is omitted, deduct 1 mark. Phrases must be in the correct context. The (apparent) change in frequency (or pitch) (of sound) detected by a listener, because the source and the listener have different velocities relative to the medium of sound propagation.vv OR An (apparent) change in observed/detected frequency/pitch as a result of the relative motion between a source and an observer/listener. (2) 6.2.1. Ambulance approaching: + f= vtv, viv, fv 450 =1, 340% y 340-v, ©. 450(340-v,)=340f, ccc. (i) Ambulance moving away: Ia? = NNN) 385 =f. awe v the sound waves i s Copyright reserved

Phydpamectocsate cl from Stanmorephysics. Gé#amber 2023 Preparatory Examination NSC — Marking Guideline 6.2.2 POSITIVE MARKING FROM 6.2.1 450(340-v,)=340f, ¥ or + 385(340+v,) = 340f, ¥ ’. 450(340-26,46)=340f, or 385(340+26,46)=340f, fs 414,98 Hz ¥ 6.3 4414}98 Hzv (Positive Marking from Question 6.2.2) QUESTION 7 7.1. To prevent charges from leaking/escaping to the ground/spheres are not earthed. 7.2.1 X touches Y: = Q+Q, Quay = Q.,,, = 20*10° *(-8%10") Qhoy = +6*10°C new Qx = +6%10°C Qy = +6x10°CV X touches Z: Q,+Q Q. =i new 2 _ 6x10°+0 Quew =a Qhew =+3*10°C new Qx = +3x10°CY Qz = +3x10°CVY 7.2.2 X. Gained electronsY 7.3.1 Marking criteria If any of the underlined key words/phrases, in the correct context is omitted, deduct 1 mark. Phrases must be in the correct context. The magnitude of the electrostatic force exerted by one point/charge on another point charge is directly proportional to the product ofjthe magnitudes of the charges and inversely proportional to the square of the/distance between them.vv¥ Copyright reserved (2) (1) [11] (1) (3) (2) (2)

Phypowmneaded from Stanmore 7.3.2 Xony: Zony: 7.3.3 Marking criteria If any of the underlined key words/phrases, in the correct context is omitted, NSC — Marking Guideline kKQiQ, v F= —= p= (2X 10°)(20 x 1079)(45 x 10%) v 7 (6 x 10-1)2 F=22,5N Fe- make pa OX 10°)(30 x 10-°)(45 x 107%) % ~ (8 x 10-1)2 F = 18,98N Fnet? = 22,52 + 18,982 Fnet =29,44N v deduct 1 mark. Phrases must be in the correct context. The electric field at a point is the electrostatic force experienced per_unit positive charge placed at that point. “~v 7.3.4 POSITIVE MARKING FROM QUESTION 7.3.2 E =Fiqv Copyright reserved 29,44/(45 x 10%) v 6,54 x 10° N-C1Y ptysics. G6pember 2023 Preparatory Examination (5) (2) (3) [18]

Prypownteaded from Stanmorephy: SICS. G6S¥ember 2023 Preparatory Examination NSC — Marking Guideline QUESTION 8 8.1 The maximum energy provided by a battery per unit charge passing through (2) itv 8.2 8.2.4 OPTION 1 OPTION 2 1 j1,1 l4q = % (2,48) ¥ V=IRV tL 14 =0,83x4v Rp 4 2 v = 3,32V Vv Rp = 1,33 O OPTION 3 V=IRV lea = % (2,48) ¥ = 2,48 x 1,33 Vv =1,65A =3,3V v¥ V=IRY =1,65x2Vv =3,3V ¥ (4) 8.2.2 | OPTION 1 W = PRAt ¥ = (2,48)? x 3x 90 Vv = 1660,61J v OPTION 2 OPTION 3 V=IR V=IR =2,48x3 = 2,48 x3 =7,44V =7,44V W=VIAt ¥ ve = 7,44 x 2,48 x90 v Wegat ¥ = 1660,61 J ¥ w= ras’ x90 Vv = 1660.61 Jv (3) 8.3 Decrease. Vv The lost volts will increase V (since the current increased). An increase in lost volts (at a constant emf), will reduce the terminal potential difference. v (3) Copyright reserved

Phydpameoascke d from Stanmorephysics . GOp¥ember 2023 Preparatory Examination NSC — Marking Guideline 8.4 e=\(R+r)v With Sz open: € = 248/433 Vv +r)v....1 With S2 closed €=3 +tnv 2 2a + = 3,43(3 +r) r= € = 3,43(3 +r) = 3,43( 3 + 0,47) = 11,90Vv (5) 8.5 Decreases. v Current will decrease. ¥ The lost volts will increase v (3) [20] QUESTION 9. 9.1 9.1.1 Negative.vv (2) 9.1.2 Electrical energy is converted to mechanical energy.v (2) 9.1.3 Split ring. Vv (1) 9.1.4 Motor effect. v (1) 9.2 9.2.1. Marking criteria If any of the underlined key words/phrase rrect context is omitted, deduct 1 mark. Phrases must be in {he ; xt. The AC potential difference which dissibe an equivalent DC potential difference. (2) 9.2.2 Vins” a 20 a R=2420 v ry (3) [11] Copyright reserved

Phydpamectocsate cl from Stanmorephysics. G6pember 2023 Preparatory Examination NSC — Marking Guideline QUESTION 10 10.1 Minimum frequency of light needed to emit electrons from the surface a certain metal.v v (2) 10.2 OPTION-4: c=fxX 3 x 108/=(200 x 10°) Vv f= 1,5.x-10"5 Hz E=hf=Wo + Ekmax ¥ (6,63 x 10°4)(1,5 x 10") V= 7,57 x 1079 J v+ % (9,11 x 10°3")v2 v Vv =7,23 x 105 m-stv OPTION 2: c F=h- =Wo + Ekmax ¥ 34 8 Fano = (66310 73x10) = 7 57 x 1049 J v4 4 (9,11 x 10-2 V Xu (200x10°) ¥ V = 7,23 x 10° m-s'¥ (6) 10.3 10.3.1 REMAINS THE SAME.¥ Same number of photons will strike the cathode per unit time. Vv Same number of electrons will be emitted per unit timew (3) 10.3.2 INCREASES.v Energy of the photon will increasev (2) 10.4 E=no Xr Wavelength inversely proportional to energy released.v Highest E therefore smallest wavelength.” - Line P v (3) [16] TOTAL: 150 Copyright reserved