Technical Sciences P1 Nov 2022 Eng hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 12 TECHNICAL SCIENCES P1 NOVEMBER 2022 MARKS: 150 TIME: 3 hours This question paper consists of 14 pages and 3 data sheets. Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 2 DBE/November 2022 NSC INSTRUCTIONS AND INFORMATION 1. Write your centre number and examination number in the appropriate spaces 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 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. You are advised to use the attached DATA SHEETS. 9. 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, etc. where required. 12. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 3 DBE/November 2022 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 numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 D. 1.1 A block with a mass of 20 kg moves towards the east at a constant velocity across a rough horizontal surface, as shown in the diagram below. Fapplied Ff θ 20 kg The velocity is constant because … A Ff = Fapplied and a = 9,8 m∙s-2. B Fapplied < Ff and a = 0 m∙s-2. C Fapplied sinθ = Ff and a = 9,8 m∙s-2. D Fapplied cosθ = Ff and a = 0 m∙s-2. (2) 1.2 Newton's Third Law of Motion refers to action-reaction pairs of forces. Which ONE of the following statements is INCORRECT for the action-reaction pairs in the picture? A They act along the same line. B Both forces act on the hammer simultaneously. C These forces act on the hammer and the nail simultaneously. D These forces act in opposite directions. (2) 1.3 Impulse is equal to the … A change in momentum. B rate of change in momentum. C product of mass and velocity. D work done by an object. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 4 DBE/November 2022 NSC 1.4 The work done to move an object over a distance by a force F, which is applied at 30° to the horizontal, is W. The work done to move the object through the same distance by the force F acting HORIZONTALLY to the surface is … A 2W B ½W C 3 W 2 D 2 W 3 (2) 1.5 Which ONE of the following statements defines strain in a material? Strain is the ratio between the … A change in diameter and the original length. B total length and the original length. C change in length and the original length. D change in stress and the original stress. (2) 1.6 Force F1 is applied to a piston, with area A1, in a hydraulic system. Another piston in the same system has area A2 and this piston can exert a force, F2. Which ONE of the following equations is INCORRECT according to Pascal's law? A F 2 A 2 = F1A1 B F1A 2 = F 2 A1 C F1 A 1 = F2 A 2 (2) (2) D A 2 A1 = F2 F1 (2) (2) (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 5 DBE/November 2022 NSC 1.7 When a light ray moves from a less optically dense medium to a more optically dense medium, the speed of the light will … A increase. B decrease. C stay the same. D None of the above-mentioned (2) 1.8 The point where the light rays meet is known as the … A focal length. B focal point. C optic axis. D principal axis. (2) 1.9 Which ONE of the following combinations indicates the relationship between capacitance and electric charge? CAPACITANCE ELECTRICAL CHARGE A increases decreases B decreases remains the same C increases increases D remains the same increases (2) 1.10 The function of a step-up transformer is to … A increase voltage. B decrease voltage. C increase magnetic flux. D decrease magnetic flux. (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 6 DBE/November 2022 NSC QUESTION 2 (Start on a new page.) 2.1 A 360 kg crate rests on the back of a truck with a rough surface. The mass of the truck is 4 550 kg and it is travelling at a speed of 105 km∙h-1 to the right. The driver applies brakes and the truck slows down to a speed of 62 km∙h -1 in 7 s. 2.1.1 If the crate is not secured with ropes, explain what will happen to it when the driver applies the brakes. (2) 2.1.2 NAME and STATE in words Newton's law of motion used to answer QUESTION 2.1.1. (3) 2.1.3 Draw a labelled free-body diagram of ALL the forces acting on the crate as the driver applies the brakes. (3) 2.1.4 Calculate the acceleration of the truck as the driver applies the brakes. (4) 2.1.5 Calculate the force applied by the brakes on the truck. (4) 2.2 Two toy cars with frictionless rollers are tied together and pulled, as shown in the diagram below. The mass of each car is as follows: m1 = 0,75 kg and m2 = 0,8 kg The cars are pulled to the right with a horizontal force of 6,5 N. m2 m1 2.2.1 State Newton's Second Law of Motion in words. (2) 2.2.2 Calculate the acceleration of the system. (4) 2.2.3 Calculate the force exerted by car m1 on car m2. (3) [25] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 7 DBE/November 2022 NSC QUESTION 3 (Start on a new page.) 3.1 A 160 g ball, bowled with a velocity of 40 m∙s-1, is struck by a cricket bat. The ball leaves the cricket bat with a velocity of 65 m∙s-1 in the opposite direction in a straight line, as shown in the diagram below. The contact time between the cricket bat and the cricket ball is 4 x 10 -3 s. 40 m∙s-1 65 m∙s-1 3.1.1 Define the term impulse. (2) 3.1.2 Calculate the impulse of the cricket bat on the ball. (4) 3.1.3 Calculate the magnitude of the net force exerted on the ball. (3) 3.2 Two blocks are sliding on a frictionless ice surface, as shown in the diagram below. 5 m∙s-1 2,5 m∙s-1 1 kg 1,8 kg Before collision v 3 m∙s-1 1 kg 1,8 kg After collision 3.2.1 State the principle of conservation of linear momentum in words. (2) 3.2.2 Calculate the velocity of the 1 kg block after the collision. (4) 3.2.3 Determine, by means of calculations, if the above collision is elastic or inelastic. (5) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 8 DBE/November 2022 NSC QUESTION 4 (Start on a new page.) An object of mass 2 kg slides down a frictionless track ABC. The object starts from rest at point A. It then passes point B, which is 1,2 m above the ground, with a speed of 0,88 m∙s-1. The object reaches point C, on the ground, with an unknown speed v, as shown in the diagram below. A 0,88 m∙s-1 B 1,2 m v ground C 4.1 State the principle of conservation of mechanical energy in words. (2) 4.2 Determine the gravitational potential energy of the object at point B. (3) 4.3 Calculate the mechanical energy of the object at point B. (4) 4.4 Calculate the speed, v, with which the object reaches point C. (4) Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 9 DBE/November 2022 NSC The diagram below shows an elevator that is moving upwards with a person. A motor delivers 43 kW to lift the elevator with the person at a constant speed of 2 m∙s-1. Ignore air friction. 2 m∙s-1 T 4.5 Define the term power. (2) 4.6 Calculate the magnitude of the tension, T, in the cable. (4) [19] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 10 DBE/November 2022 NSC QUESTION 5 (Start on a new page.) 5.1 A load causes a stress of 5,5 x 106 Pa in a round concrete bar, which has a diameter of 50 cm. The concrete bar has an original length of 3,5 m. Young's modulus for concrete is 85 x 109 Pa. 5.1.1 Define a deforming force. (2) Calculate the: 5.1.2 Force on the bar (5) 5.1.3 Strain in the bar (3) 5.1.4 Change in length of the bar (3) 5.2 The diagram below shows a man lifting the side of a car with a hydraulic jack. The input and output pistons have areas of 4,8 x 10-4 m2 and 6,2 x 10-2 m2, respectively. 5.2.1 State Pascal's law in words. (2) 5.2.2 If the man applies a force of 40 N to lift the side of the car, calculate the weight of the car experienced by the jack at that point. (4) [19] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 11 DBE/November 2022 NSC QUESTION 6 (Start on a new page.) The diagram below shows light ray AO moving from a glass slab into air. This phenomenon is known as refraction. C Glass slab A 1 O Air 2 B D 6.1 Define the term refraction. (2) 6.2 Write down the names of the following: 6.2.1 Light ray AO (1) 6.2.2 Light ray OB (1) 6.2.3 Angle 1 (1) 6.2.4 Angle 2 (1) 6.2.5 Line CD (1) [7] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 12 DBE/November 2022 NSC QUESTION 7 (Start on a new page.) The table with pictures below represents the electromagnetic spectrum arranged from the lowest frequency to the highest frequency, numbered 1 to 7. 1 2 3 4 5 6 7 Radio Visible Ultraviolet wave light 7.1 Name the radiation numbered: 7.1.1 2 (1) 7.1.2 3 (1) 7.1.3 7 (1) 7.2 State TWO uses of ultraviolet rays. (2) 7.3 Define a photon of light. (2) 7.4 A radio station broadcasts at a frequency of 102,5 MHz. Calculate the energy of the radio waves. (3) 7.5 Name any THREE colours in visible light. (3) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 13 DBE/November 2022 NSC QUESTION 8 (Start on a new page.) Two plates of the parallel plate capacitor shown below are 6 mm apart and have an area of 5 x 10-2 m2. A potential difference of 100 V is applied across the plates of the capacitor. + A - B 8.1 Calculate the charge on EACH plate. (5) 8.2 The distance between the plates is now doubled. 8.2.1 How will this change affect the magnitude of the capacitance? Refer to the RATIO in the answer. (2) 8.2.2 Explain the answer to QUESTION 8.2.1. (2) [9] Copyright reserved Please turn over

Downloaded from hlayiso.com Technical Sciences/P1 14 DBE/November 2022 NSC QUESTION 9 (Start on a new page.) An electric kettle with resistance 22 Ω and a microwave oven with resistance 44 Ω are connected in parallel and the combination is connected across a source of voltage 230 V as shown in the diagram. 230 V 22 Ω 44 Ω Calculate the: 9.1 Total resistance of the circuit (3) 9.2 Power dissipated by the electric kettle (3) 9.3 Heat produced in the electric kettle in 2 minutes (3) [9] QUESTION 10 (Start on a new page.) Learners conducted an experiment to demonstrate electromagnetic induction using a magnet and a galvanometer. Study the diagram below and answer the questions that follow. S G 10.1 What is observed on the galvanometer when the magnet is moved into the coil? (1) 10.2 Explain the observation in QUESTION 10.1. (2) 10.3 NAME and STATE in words the law used to explain this observation. (3) 10.4 State THREE ways in which the deflection on the galvanometer can be increased. (3) [9] TOTAL: 150 Copyright reserved

Downloaded from hlayiso.com Technical Sciences/P1 DBE/November 2022 NSC DATA FOR TECHNICAL SCIENCES GRADE 12 PAPER 1 GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Acceleration due to gravity g 9,8 m·s-2 Swaartekragversnelling Speed of light in a vacuum c 3,0 x 108 m·s-1 Spoed van lig in 'n vakuum Planck's constant h 6,63 x 10-34 J·s Planck se konstante Electron mass me 9,11 x 10-31 kg Elektronmassa Permittivity of free space ԑo 8,85 x 10-12 F.m-1 Permatiwiteit van vrye spasie TABLE 2: FORMULAE/TABEL 2: FORMULES FORCE/KRAG Fnet  ma p  mv fs max = μsN fk = μk N Fnet Δt = Δp Fg  mg Δp = mv f - mvi Δv L e a MA = E  I Δt WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W  Fx cos  U  mgh or/of EP  mgh 1 1 W K mv2 or/of Ek  mv2 P 2 2 t Pave = Fvave / Pgemid = Fvgemid ME = Ek + Ep Copyright reserved

Downloaded from hlayiso.com Technical Sciences/P1 DBE/November 2022 NSC ELASTICITY, VISCOSITY AND HYDRAULICS/ELASTISITEIT, VISKOSITEIT EN HIDROULIKA F  Δ A ε L σ F1 F K  2 ε A1 A 2 F P= P = ρgh A ELECTROSTATICS/ELEKTROSTATIKA Q V C E V d εο Α κεο Α C or/of C d d CURRENT ELECTRICITY/STROOMELEKTRISITEIT V R= I R s  R1  R 2  ... 1 1 1 q =I t    ... R p R1 R 2 W = VQ W P Δt W = VI  t P = VI W = I2R  t P = I2R V Δt2 W= V2 R P R Copyright reserved

Downloaded from hlayiso.com Technical Sciences/P1 DBE/November 2022 NSC ELECTROMAGNETISM/ELEKTROMAGNETISME   BA Δ ɛ =N Δt Vs Ns  Vp Np WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG 1 vf T f c E  hf or/of Eh  Copyright reserved