Technical Sciences Grade 12 P1 Eastern Cape Mock 2023 QP

NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2023 TECHNICAL SCIENCES P1 MARKS: 150 TIME: 3 hours This question paper consists of 17 pages, including 3 data sheets.

2 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) INSTRUCTIONS AND INFORMATION 1. Answer ALL the questions in the ANSWER BOOK. 2. Start EACH question on a NEW page in the ANSWER BOOK. 3. Number the answers correctly according to the numbering system used in this question paper. 4. You may use a non-programmable calculator. 5. LEAVE ONE line between subsections, e.g. between QUESTION 2.1 and QUESTION 2.2. 6. You are advised to use the attached DATA SHEETS. 7. Show ALL formulae and substitutions in ALL calculations. 8. Round off your final numerical answers to a minimum of TWO decimal places. 9. Give brief motivations, discussions, etc. where required. 10. Write neatly and legibly. Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as answers to the following questions. Choose the answer and write only the correct letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, for example 1.11 D. 1.1 An object continues in a state of uniform velocity or rest until … A it is influenced by inertia. B it is acted upon by tension. C it is acted upon by a net force. D it is influenced by gravity. (2) 1.2 A girl catches a cricket ball. Consider the action force to be the contact of the ball against the girl’s hand. What is the reaction to this force? A The impact felt in the girl’s shoulder. B The force her hand exerts on the ball. C The friction caused by the ground on the girl’s shoes. D None of the above. (2) 1.3 The SI-unit of impulse is … A N•s-1. B N•s. C J•s-1. D J•s. (2) Copyright reserved Please turn over

4 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) 1.4 Power is defined as the … A rate at which work is done. B product of mass and velocity. C rate at which velocity changes. D product of mass and acceleration. (2) 1.5 Steel balls are dropped at the same time, into four different liquids and take different times to drop to the bottom of each test tube. Which substance has the highest viscosity? A B C D (2) 1.6 In the diagram below, an object is placed in front of a converging lens at a distance less than F. The image produced by the lens is … 2F F Object F 2F A real, inverted and smaller. B real, inverted and larger. C virtual, upright and larger. D virtual, upright and smaller. (2) Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 5 1.7 Fibre optics cable used in communication works on the principle of … A regular reflection of light. B diffuse reflection of light. C refraction of light. D total internal reflection of light. (2) 1.8 Which of the following is the correct order of electromagnetic waves in ORDER OF DECREASING WAVELENGTH? A Gamma rays → X-rays → Infrared wave → Radio wave B Radio wave → Infrared wave → X-rays → Gamma rays C X-rays → Radio wave → Gamma rays → Infrared wave D Infrared wave → Radio wave → X-rays → Gamma rays (2) 1.9 A graph of power versus current is shown below. The gradient of this graph represents the … A potential difference. B EMF. C work done. D resistance. (2) Copyright reserved Please turn over

6 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) 1.10 Which ONE of the following statements does the value of the voltage or current generated by an AC generator NOT depend on? A Speed at which the coil or magnetic field rotates. B The poles of the permanent magnet. C Strength of the magnetic field. D Number of turns in the coil. (2) [20] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 7 QUESTION 2 (Start on a new page.) A block of mass 3 kg is pulled across a rough horizontal surface with a force of 25 N at 30° to the horizontal, and a 1 kg block is connected to it by a light inextensible string. The frictional force between the surface and the 1 kg block is 0,8 N. 25 N 30° 1 kg 3 kg 2.1 Define Newton’s Second Law of Motion in words. (2) 2.2 Draw a labelled free body diagram of the 3 kg block. (5) 2.3 Calculate the normal force on the 3 kg block. (4) 2.4 What type of frictional force is working in on the system? (1) 2.5 If the frictional force on the 3 kg block is 3,38 N, calculate the acceleration of the system as result of the net force. (5) 2.6 Which force is present in the string? (1) 2.7 If the angle that the 30 N force makes with the horizontal is decreased to 20°, what would happen to the frictional force? Write only INCREASE, DECREASE or REMAINS THE SAME. Explain your answer. (3) [21] Copyright reserved Please turn over

8 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 3 (Start on a new page.) A truck with mass 12 000 kg, travels at a velocity of 20 m•s-1 east, and collides with a stationary motor vehicle with a mass of 2 000 kg. After the collision, the truck and the car get stuck together and move as a single isolated system, as shown in the diagram below. N 20 m•s-1 v At rest W E 12 000 kg 2 000 kg 12 000 kg S Before collision After collision 3.1 State the principle of conservation of linear momentum in words. (2) 3.2 Calculate the final velocity of the system after the collision. (5) 3.3 Is the collision ELASTIC or INELASTIC? Use a calculation to justify your answer. (5) 3.4 It is an industrial requirement for modern cars to have crumple zones. Explain how this safety feature protects passengers in a vehicle in the event of a collision. (3) 3.5 A soccer ball, with a mass of 450 g, moves across a horizontal floor in a straight line at a speed of 6 m∙s-1. It hits a wall and then it moves in the opposite direction at 4,5 m∙s-1 directly after the collision. The ball is in contact with the wall for 0,16 s. 3.5.1 Calculate the magnitude of force that the wall exerts on the ball. (4) 3.5.2 If the ball is in contact with the wall for 0,2 s, will the net force be GREATER THAN, SMALLER THAN or EQUAL TO the answer in QUESTION 3.5.1. Explain your answer. (2) [21] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 9 QUESTION 4 (Start on a new page.) A learner moves a crate across a rough horizontal surface with a pulling force of 45 N at 25° to the horizontal across a 5 m path from P to Q. The frictional force from P to Q is 1,6 N. 45 N 25° P 5m Q 4.1 Define the term work done in words. (2) 4.2 Calculate the: 4.2.1 Net work done in moving the crate from P to Q (4) 4.2.2 Power the learner uses in moving the block from P to Q if it takes 7s (3) 4.3 If the crate is moved over a longer distance, how will this affect the magnitude of the net work done? Write only INCREASE, DECREASE or REMAINS THE SAME. Explain your answer. (3) 4.4 A 15 kg pendulum attached to the roof by inextensible string, swings from REST at point A, which is at a height of h above the ground. At point B the pendulum is half the distance above the ground than it is at point A and moves at a velocity of 14 m•s-1. Ignore the effects of air friction. 15 kg A 15 kg h B 4.4.1 State the principle of conservation of mechanical energy in words. (2) 4.4.2 Calculate h the height of the pendulum at point A. (4) [18] Copyright reserved Please turn over

10 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 5 (Start on a new page.) A metal wire with diameter 1,8 mm is stretched when a 12 N force is applied. The wire X is initially 2 m long and stretches by Y until it is 2,006 m long. X 2m Ø = 1,8 mm Y 0,006 m 12 N 5.1 Define the term strain. (2) 5.2 Calculate the: 5.2.1 Stress in the wire (4) 5.2.2 Strain in the wire (3) 5.2.3 Wire’s modulus of elasticity (3) 5.3 A hydraulic jack is used to lift a small truck with a mass 3 500 kg. The piston at A2 is used to lift the truck and has a cross-sectional area of 7,49 m2. The cross-sectional area of the input piston at A1 is given as 0,54 m2. 3 500 kg F1 A1 = 0,54 m2 A2 = 7,49 m2 5.3.1 State Pascal’s law in words. (2) 5.3.2 Calculate the pressure in the fluid of this hydraulic system. (3) 5.3.3 Calculate the force that needs to be applied at A1 to lift the truck. (3) [20] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 11 QUESTION 6 (Start on a new page.) 6.1 Use the diagram of light reflecting off a flat mirror to answer the following questions. A θ1 Mirror B θ2 C 6.1.1 State the law of the reflection of light. (2) 6.1.2 Identify B and C in the diagram. (2) 6.2 Study the diagram of refraction of light in different media and answer the following questions. Medium 1 Medium 2 6.2.1 Define the term refraction of light. (2) 6.2.2 Which optical medium in the diagram has the highest optical density? Write only MEDIUM 1 or MEDIUM 2 and explain your answer. (2) 6.2.3 Name TWO conditions of total internal reflection. (2) [10] Copyright reserved Please turn over

12 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 7 (Start on a new page.) Electromagnetic waves can be transmitted through a vacuum. 7.1 Define electromagnetic waves. (2) 7.2 Briefly explain how the police make use of ultraviolet radiation in forensic science to investigate crime scenes. (3) 7.3 Calculate the wavelength of a photon of light rays that has 2,49 × 10-19 J of energy. (5) [10] QUESTION 8 (Start on a new page.) A capacitor has a potential difference of 240 V applied across its two parallel plates. The plates have an area of 3,5 m2 and are 4 mm apart. Conductive plates A = 3,5 m2 d = 4 mm Dielectric 8.1 Define the term capacitance. (2) 8.2 Calculate the capacitance of the capacitor. (4) 8.3 Calculate the charge on each plate. (3) [9] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 13 QUESTION 9 (Start on a new page.) In the circuit diagram below the battery has an emf of 12 V. Ignore the internal resistance of the battery. A S 4Ω 6Ω 7Ω V The switch is now closed. 9.1 Define Ohm’s law in words. (2) 9.2 Calculate the: 9.2.1 Total resistance in the circuit (4) 9.2.2 Reading on ammeter A (3) 9.2.3 Power of the 6 Ω resistor (3) [12] Copyright reserved Please turn over

14 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 10 (Start on a new page.) 10.1 The sketch below illustrates Faraday’s law of electromagnetic induction. 10.1.1 State Faraday’s law of electromagnetic induction in words. (2) 10.1.2 State TWO ways in which the deflection of the galvanometer needle could be increased. (2) 10.2 700 turns Iron core 70 turns Primary Secondary coil coil Input voltage 200 V 10.2.1 Define a step-down transformer. (2) 10.2.2 A transformer has input voltage of 200 V. The number of turns on the primary coil is 700 and on the secondary coil is 70. Calculate the output voltage of this transformer. (3) [9] TOTAL: 150 Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 15 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 ʼn 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 ɛ˳ 8,85 x 10-12 F.m-1 Permittiwiteit van vrye ruimte TABLE 2: FORMULAE/TABEL 2: FORMULES FORCE/KRAG Fnet = ma p = mv fs max = μsN fk = μkN Fnet Δt = Δp Fg = mg Δp = mv f - mv i L e MA = = E l Copyright reserved Please turn over

16 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2023) WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W = FΔxcosθ U= mgh or/of EP = mgh 1 1 K= mv 2 Ek = mv 2 Wnet = FnetΔxcosθ 2 or/of 2 W Pave = Fvave / Pgemid = Fvgemid P= t ME = Ek + Ep ELASTICITY, VISCOSITY AND HYDRAULICS/ELASTISITEIT, VISKOSITEIT EN HIDROULIKA Δ F ε= = L A σ F1 F =K = 2 ε A1 A 2 F P = ρgh P= A ELECTROSTATICS / ELEKTROSTATIKA Q εο Α C= C= V d Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P1 17 CURRENT ELECTRICITY/STROOMELEKTRISITEIT V R= emf/emk ( ε )= I(R + r) I R s = R1 + R 2 + ... 1 1 1 = + + ... R p R1 R 2 W W = VQ P= Δt W = VI  t P = VI W = I2R  t P = I 2R V 2 Δt V2 W= R P= R ELECTROMAGNETISM/ELEKTROMAGNETISME Δϕ = BA Δϕ ɛ = - N Δt Vs N s = Vp Np WAVES, SOUND AND LIGHT / GOLWE, KLANK EN LIG v = fλ T= 1 f c E = hf or E = h. λ Copyright reserved Please turn over