Physical Sciences Grade 12 P1 Mpumalanga Prelim 2024 QP

Downloaded from hlayiso.com education MPUMALANGA PROVINCE REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE GRADE 12 PHYSICAL SCIENCES: PHYSICS (P1) SEPTEMBER 2024 MARKS: 150 TIME: 3 HOURS This question paper consists of 19 pages including data sheets. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 2 MDE/September 2024 NSC INSTRUCTIONS AND INFORMATION 1. Write your name on the FOLIO PAPERS. 2. This question paper consists of TEN questions. Answer ALL the questions on the FOLIO PAPERS. 3 Start EACH question on a NEW page on the FOLIO PAPERS. 4 Number the answers correctly according to the numbering system used in this question paper. 5 Leave ONE line between two subquestions, e.g. between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. 7 You may use appropriate mathematical instruments. 8 Show ALL formulae and substitutions in ALL calculations. decimal 9. Round off your FINAL numerical answers to a minimum of TWO places. 10. Give brief motivations, discussions, etc. where required. 11. You are advised to use the attached DATA SHEETS. 12. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 3 MDE/September 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 number (1.1 to 1.10) on the FOLIO PAPERS, e.g. 1.11 D. 1.1 Consider the following vector diagrams. Which one of these vector diagrams represents a zero resultant? A B D C (2) an object, mass m be, if the weight is Howfar above the earth'ssurface willsurface? 1.2 (r represents the radius of the nine times smaller than on the earth's earth) A B 2r r 3r (2) D different heights. When they 1.3 Two objects with equal masses are dropped from are both 1 m above the ground, they have A the same kineticenergy. B the same acceleration and velocity. different velocities and the same potential energy. D the same velocity and different acceleration. (2) Please turn over Copyright reserved

Downloaded from hlayiso.com Physical Sciences/P1 4 MDE/September 2024 NSC 1.4 Which one of the following momentum versus time graphs best represents the motion of an object moving from rest in a straight line under the influence of a Constant net force? A B (2) t(s) t(s) C D p t(s) t(s) 1.5 Which one of the following is a conservative force? A Gravitational force B Frictional force C Applied force Tension in a rope (2) D Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 5 MDE/September 2024 NSC 1.6 Astationary person listens to the siren of an approaching anmbulance. Which ONE of the following characteristics associated with the sound of the siren, as heard by the person, islare CORRECT? () The pitch increases (i) The wavelength increases (ii) The frequency increases (iv) The wavelength decreases A (ii) and (iv) only B ()and (ii) only C (ü) and (ii) only D (). (i) and (iv) only (2) is shown below. 1.7 The electric field pattern between two charged spheres Q1 and Q2 Q2) charge on sphere Q1 and Which ONE of the following statements regarding the Q2 is CORRECT? Charge on sphere Q1 Charge on sphere Q2 A Negative Negative Positive Negative Positive Negative Positive (2) D Positive Please turn over Copyright reserved

Downloaded from hlayiso.com Physical Sciences/P1 6 MDE/September 2024 NSC 1.8 Two identical resistors P and R are connected in the circuit as shown below. The cell has an emfe and negligible internal resistance. The switch is initially CLOSED. Switch S is now OPENED. Which ONE of the following combinations of changes will occur in P, R and V? S P R CURRENT IN P CURRENT IN R VOLTMETER V Decreases Increases Increases A Decreases Remains the same Remains the same B Decreases Decreases Remains the same D Increases Remains the same Decreases (2) 1.9 The component of an AC generator that maintains electrical contact between the rotating part/parts and the external circuit islare the.. A carbon brushes. B battery. C split rings. D slip rings. (2) 1.10 YELLOW light shines on the cathode of a photo-electric cell. A milli-ammeter in the circuit registers a reading. Incident light mA Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 7 MDE/September 2024 NSC How does the velocity of the photo-electrons and the number of photo electrons released per second change when the yellow light is replaced by a GREEN light of HIGHER intensity? VELOGITY OF PHOTO NUMBER OF PHOTO ELECTRONS ELECTRONS PER SECOND A Increases Increases B Stays the same Decreases C Decreases Stays the same Increases Decreases (2) D [20] Please turn over Copyright reserved

Downloaded from hlayiso.com Physical Sciences/P1 8 MDE/September 2024 NSC QUESTION 2(Start on a new page.) Block P, of mass 5 kg. is placed on a rough surface that is inclined at an angle of 30° to the horizontal. It is connected to a second block Q, of mass 2 kg, by a light inextensible string passing over a light frictionless pulley. An average constant frictional force of 2,5 Nacts on block Pas it moves on the incline, as shown in the diagram below. Ignore the effects of air resistance P 5 kg 2 kg Q 300 2.1 State Newton's second law of motion in words. (2) 2.2 In which direction will the system move? Cho0se from DOWN THE INCLINE or (1) UP THE INCLINE. 2.3 Draw a labelled free-body diagram for block P as it is moving on the incline. (4) 2.4 Apply Newton's second law to each of the blocks and calculate the magnitude of the acceleration of block Pwhile moving on the incline. (5) 2.5 If the string between block P and Q now breaks, how will block P's acceleration compare to that calculated in QUESTION 2.4? Choose from GREATER THAN, SMALLER THAN or EQUAL TO. Give a reason for the answer. (2) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 MDE/September 2024 NSC QUESTION 3(Start on a new page.) BallAis projected vertically upwards from the ground, near atall building, with a speed of 30 m-s.Ignorethe effects of air friction. OB 50 m 30 ms1 Explain what is meant by a projectile. (2) 3.1 3.2 Calculate the: (4) 3.2.1 total time that ballA will be in the air. 3.2.2 magnitude of the displacement of ballA during the last second before reaching maximum height. (4) ball B is projected vertically upwards Two seconds after ball A is projected upwards, building is 50 m above the ground. the from the roof of the same building. The roof ofsame time. Refer to the diagram above. Both balls A and B reach the ground at the lgnore the effects of air friction. projected upwards from the roof. (4) 3.3 Calculate the velocity at which ball B was of both balls A and B on the same 3.4 Sketch velocity-time graphs for the motion balls A and B respectively. set of axes. Clearly label the graphs for Indicate the following on the graphs: to reach the ground (a) Time taken by both balls Aand Bmaximum height (4) (b) Time taken by ball A to reach its [18]) Please turn over Copyright reserved

Downloaded from hlayiso.com Physical Sciences/P1 10 MDE/September 2024 NSC QUESTION 4 (Start on a new page.) Aflower pot falls from an apartment balcony. The height of the balcony above the mud is 15 m and the mass of the flower pot is 1.5 kg. lgnore air resistance and frictional force of the mud. Mud 4.1 Calculate the velocity with which the flower pot hits the mud. (3) The flower pot falls into the mud and comes to rest within 0.5 s. Mud 4.2 Define the term impulse in words. (2) 4.3 Calculate the magnitude of the: 4.3.1 Net force on the flower pot as it falls into the mud (3) 4.3.2 Force of the mud on the flower pot (3) 4.4 How will the force be influenced if the time taken for the flower pot to come to rest is longer? Choose from INCREASE, DECREASE or STAY THE SAME. Explain the answer. (3) (14] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 11 MDE/September 2024 NSC QUESTION 5 (Start on a new page.) A 5 kg block is released from rest at point T, from a height of 5 m and slides down a frictionless incline to P t then moves along a frictionless horizontal surface PQ and finally moves up a rough inclined plane QR. It comes to rest 3mabove the horizontal at point R. The frictional force between the surface QR and the block is 18 N. as shown in the diagram below. 5kg R 5m I3 m 5.1 Define the term non-conservative force. (2) 5.2 Using conservation of mechanical energy only to calculate the speed of the (4) block at point P. 5.3 Draw afree-body diagram for the block as it is sliding between TP. (2) 5.4 Explain why the kinetic energy at point P is the same as that at point Q. (1) 5.5 State the work-energy theorem in words. (2) 5.6 Calculate the angle (0) of the slope QR. (6) (17) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 12 MDE/September 2024 NSC QUESTION6 (Start on a new page.) Scientists studying the social interaction of dolphins in captivity connected an underwater sound recorder to an oscilloscope and immersed it in the dolphin tank at an aquarium. They recorded the sound waves emitted by a dolphin as it approached the microphone. The waves recorded on the oscilloscope are represented in the diagram below. (Pa) P t(s) 5 x 105 /1x 10 4 6.1 State the Doppler effect in words. (2) 6.2 The average frequency of the social vocalisations of dolphins is 39 kHz. (2) Proof by means of calculation that the frequency recorded is 1 kHz higher than the actual frequency. 6.3 Explain why the recorded frequency is higher than the actual frequency. (2) 6.4 Calculate the speed at which the dolphin is approaching the recorder. (5) The speed of sound in sea water is 1500 ms1. [11] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 13 MDE/September 2024 NSC QUESTION 7 (Start on a new page.) Two point charges Q1en Qz are placed 20 cm apart as shown in the diagram below. Point P is 10 cm to the right of charge Q2. -4 uC +3 pC Q1 20 cm 10cm P Q2 7.1 Define the term electric field at a point. (2) 7.2 Calculate the magnitude and direction of the net electric field at point P. (6) The two charges are brought into contact with each other and placed back at their original positions. 7.3 Calculate the charge on each of the point charges after contact. (2) After Q1 and Qz were brought into contact and placed at their original positions, a charge Q3 is placed 25 cm south of Q1. Charge Q1 experiences a net force of 5,4 x10:1 N due to the other two charges as shown in the diagram below. Fnet =5,4x101N Q1 20 cm 25 cm Q3 (6) 7.4 Calculate the magnitude and nature of the charge on Qs. [16] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 14 MDE/September 2024 NSC QUESTION 8 (Start on a new page.) The circuit diagram below shows a cell with an internal resistance 2 Q, connected to three resistors, a light bulb, aswitch, an ammeter and connecting wires. The resistance of the three resistors are R, 2R and 6R respectively and the resistance of the bulb is 60 Q. When switch S is CLOSED, the voltmeter and ammeter have readings as shown in the diagram below. 29 60 Q 6R/R3 RIR1 V)av 0,1A( A) 2R|R2 8.1 Write down the value of the: 8.1.1 Potential difference across resistor R2 (1) 8.1.2 Current through R2 (1) 8.2 Calculate the: 8.2.1 Resistarnce of resistor R1 (3) 8.2.2 Emf of the cell (5) 8.2.3 Power dissipated in the light bulb (3) Switch S is now OPENED. 8.3 Write down the reading on voltmeter V. (1) 8.4 What willhappen to the 'lost volts? Choose from INCREASES, DECREASES, REMAINS THE SAME. Explain the answer with reference to total resistance and current. (3) [17] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 15 MDE/September 2024 NSC QUESTION 9 (Start on a new page.) 9.1 The simplified diagram of a DC motor is shown below. The current in the coil is in the direction XY. Y N 9.1.1 In which direction willthe above coil rotate? Choose from CLOCKWISE or ANTI-CLOCKWISE. (1) 9.1.2 Write down the energy conversion that takes place in a motor. (1) 9.1.3 Sketch an emf versus time graph for two complete rotations of the coil, starting from the position of the coil as shown in the simplified diagram above. (2) 9.2 The specifications of an electric drillare as follows: 2100 W:; 230 V 9.2.1 Define the term root mean square potential difference (2) 9.2.2 Calculate the maximum value of the current that can flow through the drill. (4) [10) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 16 MDE/September 2024 NSC QUESTION 10(Start on a new page.) When light of different frequencies shines on the metal cathode of a photo-cell, photo electrons are released from the surface of the cathode. The graph below shows the relationship between the maximum kinetic energy (Ek(man) of a released photo-electron and the wavelength of the incident light. GRAPH of Ek(max) Versus WAVELENGTH 16,0 14,0 12,0 10-19)(J) 10,0 8,0 (x (max) 6,0 Ek 4,0 2,0 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 0,5 Wavelength (x 10-7) (m) energy of the released 10.1 Determine, by using the graph, the maximum kinetic (1) photo-electron if the wavelength of the incident light is 3 x 10 m. the wavelength of 10.2 What is the relationship, deducted from the graph, betweenthe released photo energyof the incident light and the maximum kinetic kinetic (2) electron? (2) 10.3 Define the term work function. the metal that is used as a 10.4 Use the graph and calculate the work function of (3) cathode for this photo-cell. 10.5 The velocity of the released photo-electron is 2,6 x 10° ms. (5) Calculate the wavelength of the incident light. [13] TOTAL: 150 Please turn over Copyright reserved