Physical Sciences Grade 12 Limpopo Prelim 2024 QP

Downloaded from hlayiso.com Confidential Information - Ihisis foL officalconsumotion LIMPOPO PROVINCIAL GOVERNMENT REPUBLIC OF SOUTH AFRICA DEPARTMENT OF EDUCATION NATIONAL SENIOR CERTIFICATE GRADE 12 PHYSICAL SCIENCES:PHYSICS (P1) SEPTEMBER 2024 MARKS: 150 TIME: 3 hours EPHSCP1 This question paper consists of 17 pages and 3-paged data sheets. Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for official consumption Physical Sciences/P1 2 LimpopoDoE/September 2024 NSC INSTRUCTIONS AND INFORMATION 1. Write your NAME in the appropriate space on the ANSWER BOOK. 2. This question paper consists of TEN questions. Answer ALL the questions in the ANSWER BOOK. 3. Start EACH question on a NEW page in the ANSWER BOOK. 4 Number the answers correctly according to the numbering system used in this question paper. 5. Leave ONE line between two sub questions, for example between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. 7. Youmay use appropriate mathematical instruments. 8 You are advised to use the attached DATA SHEETS. Show ALL formulae and substitutions in ALL calculations. 10. Round off your FINAL numerical answers to a minimum of TWO decimal places. 11. Give brief motivations, discussions, et cetera where required. 12. Write neatly and legibly. Copyright reserved Please turn over

Downloaded Confidential from hlayiso.com Information -This is for official consumption Physical Sciences/P1 3 LimpopoDoE/Septermtber 2024 NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A-D) next to the question numbers (1.1-1.10) in the ANSWER B0OK, e.g. 1.11 E. 1.1 When two surfaces touch each other, the component of the contact force parallel (tangential) to the surfaces is called the A applied force. B normal force. C gravitational force. D frictional force. (2) 1.2 A person is transported to the mythical planet Mango, which is EIGHT times as massive as Earth and has TWICE the diameter. The person's weight on the planet Mango compared to his/her weight on Earth would be ... A 2 times larger. B 2times smaller. 4 times larger. D 4 times smaller. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for official consumption Physical Sciences/P1 4 NSC LimpopoDoE/September 2024 1.3 Ihe acceleration of free fall is determined by measuring the times t, and t taken for a steel ball to fall from rest and pass points Xand Y. The distance between X and Y is h as shown in the diagram below. Rest position --t=0 X -t h --t2 Ground Which ONE of the following is the CORRECT expression used to calculate the acceleration due to gravity? A h (ty-t)2 B 2h (t2-t|) C 2(t,-t,)? D 2h (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information - This is for official consumption Physical Sciences/P1 5 LimpopoDoE/September 2024 NSC 1.4 The sketch graph below represents the the time (t), for a body traveling in a relationship between momentum (P) and straight line. P t Which ONE of the following conclusions based on the graph is TRUE about the net force acting on the body? The net force A is exactly zero. B uniformly increases. uniformly decreases. D remains constant. (2) 1.5 Ablock X of mass 3 kg is accelerated from rest by a force of 5 N for 2 s. An identical block Y (of mass 3 kg) is accelerated from rest by a force of 5 Nfor 4 s. Which ONE of the following ratios, EK, (X) :Ek, (Y), is correct? A 1:2 B 2:1 C 1:4 D 4:1 (2) Copyright reserved Please turn over

Downloaded from hlayiso.com consumption official Confidential Information - This is for Physical Sciences/P1 6 LimpopoDoE/September 2024 NSC relationship between the ratio of #. Tne sketch graph below represents the 1.6 the speed of the listener obsenved frequency to the source frequency (Jand (V) for a stationary source. P fs 0 VL Which of the following combinations correctly represents the value ofP andthe direction in which the listener moves? VALUE OF P DIRECTION A 1 Away from the source B 1 Towards the source C 2 Towards the source D 2 Away from the source (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for official consumption Physical Sciences/P1 7 LimpopoDoE/September 2024 NSC 1.7 Two point charges, X, with a charge of +a., and Y, with a charge of -24, are separated by a distance r. X exerts an electrostatic force, F, on Y. The charges on X and Y are EACH increased by +3q. Which ONE of the following CORRECTLY represents the new force exerted by charge Xon charge Y? A B F 2F D 4F (2) 1.8 In the circuit represented by the diagram below, V; is connected across a rheostat (variable resistor). S R Which ONE of the following sketch graphs represents the relationship between the readings on V and V2 as the resistance of the rheostat is increased? A B V. V2 V2 D V V2 V2 (2) Please turn over Copyright reserved

Downloaded from hlayiso.com Confidential Information - This is for official consumption Physical Sciences/P1 7 LimpopoDoE/September 2024 NSC 1.7 Two point charges, X, with a charge of +g, and Y, with a charge of -24, are separated by adistancer. Xexerts an electrostatic force, F, on Y. The charges on X and Y are EACH increased by +3q. Which ONE of the following CORRECTLY represents the new force exerted by charge X on charge Y? A B F C 2F D 4F (2) 1.8 In the cicuit represented by the diagram below, V is connected across a rheostat (variable resistor). S R Which ONE of the following sketch graphs represents the relationship between increased? the readings on Vand V2 as the resistance of the rheostat is B A V4 VA 0 V2 V2 D V2 V2 (2) Please turn over Copyright reserved

Downloaded from hlayiso.com official consumption Confidential Information -This is for Physical Sciences/P1 8 LimpopoDoE/September 2024 NSC 1.9 The diagram below represents an electrical machine. N Battery Which ONE of the following represents the CORRECT type of the machine? A DC generator B DC motor ACgenerator D AC motor (2) 1.10 An atom in its ground state absorbs energy E and is exited to a higher energy state. When the atom returns to the ground state, a photon with energy ... A Eis absorbed. B Eis released. C 2E is absorbed. 2E is released. (2) D (20] Please turn over Copyright reserved

Downloaded from hlayiso.com Confidential Information This is for official consumption Physical Sciences/P1 9 LimpopoDoE/September 2024 NSC oUESTION 2(Start on a new page) 2.1 A physics learner pushes a 34 kg crate up the plane with a horizontal force of magnitude F (parallel to the horizontal),as shown in the diagram below. Crate 34kg F 25° The coefficient of kinetic friction between the crate and the surface is 0,25. friction is 2.1.1 Suggest a reason as to why the coefficient of kinetic dimensionless (i.e. has no units). (1) VELOCITY. The crate moves up the plane at a CONSTANT (2) 2.1.2 State, in words, Newton's First Law of Motion. crate whilst in motion. (4) 2.1.3 Draw a labelled free-body diagram for the that the kinetic frictional force 2.1.4 Using an appropriate calculation, show (3) 0,106F. acting on the crate is 75,495 + magnitude of the force F. (3) 2.1.5 Hence or otherwise, calculate the 6.38 x 108 the Earth is 5,98 x 102 kg and the radius of the Earth is 2.2 The mass of above the surface of the Earth is satellite that is 1000 km m. A small on the satellite is the accelerating towards the Earth. The only force acting the Earth. If the weight of the satellite is 3 660 N at 1000 gravitational force of of the surface of the Earth, calculate its weight on the surface (4) km above the Earth. [17] Please turn over Copyright reserved

Downloaded from hlayiso.com Information - This is for official consumption Confidential Physical Sciences/P1 10 NSC LimpopoDoE/September 2024 QUESTION 3 (Start on a new page) A ball is dropped from a height of 20 m and rebounds with avelocity which is three. quarter of the velocity with which it hits the ground. The ball bounces two times. 28 shown in the position-versus-time sketch graph below. 20 A P R Q Time (s) The effects of air resistance and the time lapse with the ground are neglected. 3.1 Define the term free fall. (2) 3.2 State the acceleration of the ball the instant it reaches the maximum height after the FIRST bounce. (2) 3.3 Calculate the time interval between the FIRST and SECOND bounces (AtaB), by using the equations of motion. (6) 3.4 Sketch a velocity-versus-time graph for the motion of the bal from the instant it is dropped until it reaches the maximum height after the first bounce. Clearly indicate the values of the following on the graph: "The times A and P "The velocity with which it hits the ground "The velocity with which it rebounds (3) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for official consumption Physical Sciences/P1 11 LimpopoDoE/September 2024 NSC QUESTION 4 (Start on anew page) A ballis falling freely. When its downwards speed reaches 9,2 ms, it explodes into two equal parts. Part I goes straight up to a height of 13,7 mabove the point of explosion. Ball BEFORE EXPLOSION AFTER EXPLOSION 4.1 Define,in words,the term momentum as applied in physics. (2) 4.2 Calculate the initialvelocity of part I just after the explosion (3) 4.3 State the principle of conservation of linear momentum in words. (2) 4.4 Calculate the magnitude of the velocity of part I just after the explosion. (4) [11] 4 Copyright reserved Please turn over

Downloaded from hlayiso.com consumption Confidential Information -This is for official Physical Sciences/P1 12 LimpopoDoE/September 2024 NSC QUESTION 5 (Start on a new page) Atruck of mass 6 000 ka accelerates from REST at the top of a slope to 11 ms' at the bottom. The slope is 480 m long and the truck starts 55 m above level ground, as shown in the diagram below 480 m |55 m -20 m Arrestor bed The average frictional force on the truck during the journey down the slope is 3,84 x 10 N. 5.1 Classify frictional force as a CONSERVATIVE FORCE or NON-CONSERVATIVE FORCE (1) 5.2 Define, in words, the term pOwer as applied in physics. (2 5.3 Calculate the power produced by the engine if the truck takes 88 s to reach the bottom of the slope. (6 At the bottom of the slope the truCk cannot stop and enters a gravel arrestor bed, The bed is 20 m long and provides a resistive force of 0,35 times the weight of the truck. 5.4 Use acalculation to determine if the bed is long enough tostop the (4) truck. (13) Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for officialconsumption Physical Sciences/P1 13 LimpopoDoE/September 2024 NSC QUESTION 6 (Start on a new page) 6.1 ACommuter train passes a passenger platform at a constant speed of 40,0 ms ". The train horn is sounded at its characteristic frequency of 320 Hz. Take the speed of sound in air to be 340 ms. 6.1.1 State Doppler effect in words. (2) Calculate the: 6.1.2 Frequency heard by a person on the platform as the train approaches the platform. (4) 6.1.3 Wavelength detected by a person on the platform as the train approaches. (3) 6.2 Amotorcycle starts from rest and accelerates along a straight line at 2,81 ms². The speed of sound in air is 343 ms1. A siren at the starting point remains stationary. Use a suitable calculation to prove that the distance that the motorcycle has travelled when the driver hears the frequency of the siren at 90% of the value it has when the motorcycle is stationary, is 209,34 m. (5) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com (onfidential Infornmation This Is for official consumption Physical Sciences/P1 14 NSC LimpopoDoE/September 2024 QUESTION 7 (Start on a new page) 71 Two unequal positive point charges, Q, and Q2. are 0,02 mapart, as shown in the diagram below 0,02 m The charge of Q is TWICE that of Q and the electrostatic force that EACH charge experiences is 9 x 10:3 N. Point P is 0,02 m away from Q, as the diagram below illustrates. A We 0.02 m 0,02 m 7.1.1 Define, in words, the term electric field at a point in space. (2) 7.1.2 Calculate the net electric field at point P due to charges Q1 and Q. (7) 7.2 Two small spheres, A and B, are fixed in place and separated by 2,0 x 10 m in a vacuum. Sphere A has a charge of +1,0 x 10* C, and sphere B has a charge of -1,0x 10 C, as shown in the diagram below. +1,0 x 105C -1,0 x 10-6C B 0,02 m 7.2.1 State Coulomb's Law in words. (2) Calculate the: 7.2.2 Number of excess electrons on sphere B (2 7.2.3 Using a suitable calculation, show that the number of electrons that must be removed from A and put onto B to make the electrostatic force that acts on EACH sphere an attractive force whose is 45,0 N, equals 2,59 x 1012 magnitude (6) (19) Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for official consumption Physical Sciences/P1 15 LimpopoDoE/September 2024 NSC QUESTION 8 (Start on a new page) In the circuit shown in the diagram below, the reading on an ammeter Ais double that on ammeter Az and the reading on voltmeter V, is three times that on voltmeter Vi. ¿= 20,4 V A1 10 2 R1 92 R2 V2) The battery has an emf of 20,4 Vand an unknown internal resistancer. 8.1 Define the term emf of a battery. (2) 8.2 Calculate the resistance of: 8.2.1 Resistor R1 (3) 8.2.2 Resister R2 (3) The readingon V2 is 9v. 8.3 Calculate the: 8.3.1 Potential difference across the 10 Q resistor (3) 8.3.2 Reading on ammeter A (3) 8.3.3 Internal resistance r (3) [17] Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for officialconsumption Physical Sciences/P1 16 LimpopoDoE/September 2024 NSC QUESTION 9 (Start on a new page) The diagram represents a simple generator. The coil is rotated in an anti-clockwise direction. B Output 9.1 Does the diagram represent an AC or a DCgenerator? Suggest a reason for the answer. (2) 9.2 State the energy conversion that takes place in this generator. (1) 9.3 For the parts labelled A and B in the diagram, write down: 9.3.1 Their name (1) 9.3.2 Their function (1) 9.4 The part XY of the coil is about to move upwards. As soon as it moves upwards, willthe induced current flow from Xto Yor from Yto X? (1) 9.5 The peak voltage supplied by this generator is 120 V. 9.5.1 In the position that the coil is shown, is the output voltage 0V, 85 Vor 120V? (1) The rms value of the current supplied to the external circuit is 1,2 A. 9.5.2 Define the term rms for an alternating current. (2) 9.5.3 Calculate the average power output of the generator. (4) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Confidential Information -This is for official consumption Physical Sciences/P1 17 Limpopo DoE/September 2024 QUESTION 10 (Start on a new page) The diagram below shows a photoelectric cell which is connected to an adjustable emf. group of learners use the device to study the photoelectric effect. A - The learners irradiate the cell with blue light of wavelength 470 nm. They record the readings on the ammeter as the cell is irradiated with blue light of different grades of intensity. 10.1 Describe the photoelectric effect in words. (2) 10.2 For this experiment, write down the following: 10.2.1 Independent variable (1) 10.2.2 ONE factor that must be kept constant (with respect to light) (1) 10.2.3 An investigative question (2) 10.3 The learner observes that the ammeter readings increase when the intensity of the blue light increases. Explain this observation. (2) 10.4 The metal of the photoelectric cell has awork function of 2,35 x1019 J. calculate the maximum kinetic energy with which the photoelectrons are emitted from the metal. (3) 10.5 Briefly explain why metals shine even when the frequency of the radiation falling on the surface is below the threshold frequency. (2) [13] GRAND TOTAL: [150] Copyright reserved