Technical Sciences Grade 12 P1 Gauteng Mock 2019 QP (Eng)

Downloaded from hlayiso.com GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION 2019 11101 TECHNICAL SCIENCES PAPER 1 TIME: 3 hours MARKS: 150 16 pages + 2 data sheets P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 2 (Paper 1) 11101/19 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION TECHNICAL SCIENCES (Paper 1) TIME: 3 hours MARKS: 150 INSTRUCTIONS AND INFORMATION 1. This question paper consists of TEN questions. 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. Leave ONE line between two sub-questions, e.g. between Question 2.1 and Question 2.2. 5. You may use a non-programmable calculator. 6. You are advised to use the attached DATA SHEETS. 7. Round-off your FINAL numerical answers to a minimum of TWO decimal places. 8. Give brief motivations, discussions, etc. where required. 9. Write neatly and legibly. P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 3 (Paper 1) 11101/19 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Every question has only ONE correct answer. Choose the answer and write only the letter (A – D) next to the question number (1.1 – 1.10) in the ANSWER BOOK, e.g. 1.11 D. 1.1 A swimmer pushes herself against the wall of the swimming pool as shown in the diagram below. Which law best describes why the swimmer moves forward after pushing off from the wall? A The law of inertia B Newton’s First Law C Newton’s Second Law D Newton’s Third Law (2) 1.2 Impulse is … A the same as momentum. B the same as force. C determined by the change in momentum. D independent from force. (2) P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 4 (Paper 1) 11101/19 1.3 A tennis ball with mass of 0,1 kg, moving to the East at a velocity of 10 m·s-1, strikes a brick wall and rebounds to the West at a velocity of 5 m·s-1. What is the change in momentum of the tennis ball after its collision with the wall? vi = 10 m.s–1 0.1 kg vf = 5 m.s–1 brick wall A 1,5 kg· m·s-1 East B 1,5 kg·m·s-1 West C 0,5 kg·m·s-1 East D 0,5 kg·m·s-1 West (2) 1.4 The graph below represents the relationship between the work done on an object and the time taken for this work to be done. Work (J) Time (s) The gradient of the graph represents the … A momentum. B kinetic energy. C potential energy. D power. (2) P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 5 (Paper 1) 11101/19 1.5 A mass piece attached to a spring in Diagram A below is pulled downward. When released the spring returns to its position of rest as shown in Diagram B. The reason for the spring returning to its original position of rest is because … A its restoring force is greater than its deforming force. B its restoring force is less than its deforming force. C its restoring force is equal to its deforming force. D its restoring force is inversely proportional to its deforming force. (2) 1.6 Hooke's Law gives a relationship between stress and strain. Which ONE of the following is the CORRECT relationship between stress and strain, according to Hooke's Law? A Stress is directly proportional to strain within the limit of elasticity. B Stress is inversely proportional to strain within the limit of elasticity. C Strain is inversely proportional to the stress that causes it, if elasticity is not exceeded. D Strain is directly proportional to the stress that causes it, even if the limit of elasticity is exceeded. (2) P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 6 (Paper 1) 11101/19 1.7 In the picture provided below, which test tube consists of air that has a high viscosity? A 1 B 2 C 3 D 4 (2) 1.8 The pressure in a liquid at a specific point is dependent on … A the density of the liquid and the amount of liquid. B the density of the liquid and the depth under the surface. C the color of the liquid and the amount of liquid. D the density of the liquid and the temperature of the liquid. (2) 1.9 Which of the following should be added to Silicon to form N-type doping? A Germanium B Phosphorus C Boron D Gallium (2) 1.10 The capacitance of a parallel plate capacitor is C. If the distance between the plates is doubled, what will be the new capacitance of the capacitor? A 4C B 2C C C D ½C (2) [20] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 7 (Paper 1) 11101/19 QUESTION 2 (Start on a new page.) Two learners, A and B, are using a block of mass 0,12 kg as a toy car. Learner A is pushing the toy car with a force of 8 N at an angle of 60º to the right and Learner B is pushing the same block with a force of 5 N to the left. The block experiences a frictional force of 0,3 N horizontally to the surface as shown in the diagram below. 2.1 Define the term acceleration. (2) 2.2 Use the diagram above to answer the questions that follow: 2.2.1 Calculate the magnitude and the direction of the net force. (5) 2.2.2 Calculate the magnitude of the acceleration of the block. (3) 2.2.3 Write down the NAME of the law that can be used to explain the movement of the block. (1) 2.2.4 State the law identified in Question 2.2.3 in words. (2) 2.2.5 Draw a free-body diagram of all the forces acting on the block. (5) 2.3 A boy is standing on his skateboard next to a solid wall. As soon as he pushes against the wall, he moves in the opposite direction. 2.3.1 What will happen to the boy after pushing against the wall? (1) 2.3.2 Give a reason for your answer to Question 2.3.1. (2) [21] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 8 (Paper 1) 11101/19 QUESTION 3 (Start on a new page.) Two train coaches, A and B, with masses of 1 000 kg and 2 000 kg respectively are attached to each other with a compressed spring. They move to the right at 4 m·s-1 along a frictionless, horizontal railway track. When the spring is released, and it has expanded completely, the 2 000 kg coach moves to the right at a velocity of 5,6 m·s-1 as shown in the diagram below. 3.1 State the principle of Conservation of Linear Momentum in words. (2) 3.2 Calculate the magnitude and direction of the velocity of the 1 000 kg coach immediately after the spring has expanded completely. (4) 3.3 If it takes 0,2 s for the spring to expand completely, ... 3.3.1 calculate the Impulse of Coach A on Coach B. (3) 3.3.2 calculate the average force exerted by Coach A on Coach B. (4) 3.4 3.4.1 How will the average force exerted by A on B be affected if the time taken for the spring to expand is increased to 0,5 seconds. Write down only INCREASE, DECREASE or REMAINS THE SAME. (1) 3.4.2 Explain your answer to Question 3.4.1. (2) [16] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 9 (Paper 1) 11101/19 QUESTION 4 (Start on a new page.) A hiker drops a parcel of mass 2,5 kg, from a 10 m high cliff as shown in the picture below. 4.1 State the principle of Conservation of Mechanical Energy in words. (2) 4.2 Calculate the total mechanical energy of the parcel at the top of the cliff. (4) 4.3 Another hiker at the bottom of the cliff picks up the parcel and walks 0,5 m horizontally with it. 4.3.1 Is there work done on the parcel after the second hiker has walked 0,5 m with it? Answer YES or NO. (1) 4.3.2 Explain your answer to Question 4.3.1 (2) [9] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 10 (Paper 1) 11101/19 QUESTION 5 (Start on a new page.) Two elastic cylindrical rods (X and Y) made from the same TYPE of metal have a length of 1,6 m and are attached to a beam. Two 5 kg mass pieces are attached to each rod. The diameter of rod Y IS DOUBLE the diameter of rod X. 5.1 Define the term stress. (2) 5.2 Use the diagram above to answer questions that follow. 5.2.1 If the stress on rod X is 1,6 Pa, calculate the cross-section area of rod X. (3) 5.2.2 Calculate the stress on rod Y. (2) 5.2.3 The equilibrium length of rod Y was 15 cm. If rod Y is extended by 20%, use relevant formula to calculate the strain of elasticity of rod Y. (4) 5.2.4 Calculate Young’s modulus for rod Y when extended. (2) 5.3 Define the term strain. (2) P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 11 (Paper 1) 11101/19 5.4 The graph below represents the ratio of stress versus strain. 5.4.1 What does point B represent on the graph? (1) 5.4.2 In which region will an object return to its original size and shape? (CHOOSE between, E and B, B and C, or C and D.) (1) 5.4.3 State Hooke’s Law in words. (2) 5.4.4 Between which TWO points, indicated on the graph, represents the region where Hooke’s Law is obeyed? (1) [20] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 12 (Paper 1) 11101/19 QUESTION 6 (Start on a new page.) The table below shows different types of motor oils and their gradings, used in different temperature regions, in different seasons. Motor Oil Type of oil Grading A Low viscosity 5W-30 B High viscosity 5W-40 6.1 Define the term viscosity. (2) 6.2 What does 5W-30 represent on the label of a motor oil container? (2) 6.3 Use the information given in the table above to choose which motor oil (A or B) will be suitable for use in summer as compared to winter. (1) 6.4 Explain your answer to Question 6.3 above in terms of viscosity and temperature. (2) 6.5 Distinguish between single/mono-grade and multi-grade motor oils. (2) [9] QUESTION 7 (Start on a new page.) 7.1 Explain the term hydraulics. (2) 7.2 Write down TWO applications of a hydraulic system. (2) 7.3 In the diagram below, a diver is seen swimming under water. The pressure acting on the diver’s forehead is 1,2 x 105 Pa and the surface area at the back of his head is 8,4 x 10-3 m2. 7.3.1 State Pascal’s Law. (2) 7.3.2 Calculate the magnitude of the force that acts on the diver’s head. (3) 7.3.3 State the direction of the force of the water acting on the diver. (1) P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 13 (Paper 1) 11101/19 7.4 The diagram below represents a dam wall which is 20 m high. The water density at 4˚C is 1 000 kg.m-3 Calculate the pressure that the water exerts one meter from the bottom of the dam. (4) 7.5 The diagram below represents a simple hydraulic system that is used to lift cars. The force applied by Fs is 130 N downwards. The surface area of As is 0.002 m2. The surface area of Al is 0,025 m2. Calculate the force Fl due to pressure exerted by force Fs. (3) [17] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 14 (Paper 1) 11101/19 QUESTION 8 (Start on a new page.) To determine the unknown resistance of a resistor X, learners connected the apparatus according to the circuit diagram shown below. They start with one cell and then keep on increasing the number of cells in series up to four cell. 8.1 State Ohm’s Law in words. (2) 8.2 Which variable must be kept constant to ensure the reliability of the results. (1) 8.3 The table below represents the ammeter and the voltmeter reading obtained by learners. Voltmeter reading Ammeter reading 1,5 V 0,5 A 3,0 V 1,0 A 4,5 V 1,5 A 6,0 V 2,0 A 8.3.1 Use the information from the table to draw a graph of potential difference versus current. (4) 8.3.2 What does the gradient of the graph represent? (1) 8.3.3 Calculate the resistance of the resistor X. (3) 8.4 The learners kept the circuit closed for 25 s. 8.4.1 Calculate the amount of heat generated in the resistor during this time. (3) 8.4.2 How will the current of the circuit be affected if the resistance of X increases? (1) [15] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 15 (Paper 1) 11101/19 QUESTION 9 (Start on a new page.) A group of learners set up an experiment to determine the characteristics of a p-n junction diode. They connected a variable power source, a milli-ammeter, a p-n junction diode, a 1 000 Ω resistor and a voltmeter as shown below. 9.1 What does doping mean? (2) 9.2 The results in the table below were obtained by the learners during the forward bias of the diode. V(diode) I(diode) 0V 0A 0.4 V 1 mA 0.43 V 2 mA 0.46 V 3 mA 0.47 V 4 mA 0.48 V 5.5 mA 0.49 V 7 mA 0.53 V 15 mA 0.55 V 21 mA 0.55 V 28 mA 0.55 V 34 mA 9.2.1 Sketch a graph representing the data collected from the table above. (3) 9.2.2 Draw a conclusion based on the readings in the table above. (2) 9.3 A parallel plate capacitor consists of two plates with a total surface area of 100 cm2. 9.3.1 Define the term capacitance. (2) 9.3.2 Give ONE function of a smoothing capacitor. (1) 9.3.3 Give TWO factors which affect the capacitance of a capacitor. (2) 9.3.4 Calculate the capacitance (in farads) of the capacitor if the plate separation ‘d’ is 0,25 cm and the dielectric medium used is air. (The dielectric constant for air is 8,84x10-12 F.m-1.) (4) [16] P.T.O.

Downloaded from hlayiso.com TECHNICAL SCIENCES 16 (Paper 1) 11101/19 QUESTION 10 (Start on a new page.) Transformers play an important role in the transmission of electrical energy between electricity-generating plants and the communities they serve. See the diagram below. 10.1 Define the term transformer. (2) 10.2 Which of the two transformers is a … 10.2.1 step-up transformer? (Choose between transformer A or B.) (1) 10.2.2 step-down transformer? (Choose between transformer A or B.) (1) 10.3 A step-down transformer in a radio has 330 turns in the primary coil and 25 turns in the secondary coil. The plug connects the primary coil to a 240 V socket while the radio is turned on. A transistor circuit of the receiver is connected to the secondary coil. Calculate the voltage across the secondary coil. (3) [7] TOTAL: 150 END

Downloaded from hlayiso.com TECHNICAL SCIENCES 17 (Paper 1) 11101/19 DATA FOR TECHNICAL SCIENCES GRADE 12 – PAPER 1 INFORMATION SHEET TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity g 9,8 m·s-2 Permittivity of free space εo 8,85 x 10-12 F⋅m-1 TABLE 2: FORMULAE FORCE Fnet = ma p = mv = m sN fk = max fs µ k N Fnet Δt = Δp Fg = mg Δp = mv f - mv i WORK, ENERGY AND POWER W = F∆x cos θ U = mgh or E P = mgh 1 1 K= mv 2 or Ek = mv 2 ∆K = K f − K i or ∆Ek = Ekf − Eki 2 2 W Pave = Fvave P= ∆t ME = Ek + Ep ELASTICITY, VISCOSITY AND HYDRAULICS F Δ σ = / Stress = ε= / Strain = Change in length A L Originallength F1 F P = ρgh = 2 A1 A 2 σ =K / ε Pressure (P) = modulus of elasticity =

Downloaded from hlayiso.com TECHNICAL SCIENCES 18 (Paper 1) 11101/19 ELECTROSTATICS κ εο Α εο Α V C= C= E= d and d d Q C= V CURRENT ELECTRICITY V R= q=I ∆t I W W = VQ P= Δt W = VI ∆ t P = VI W = I2R ∆ t P = I 2R V Δt2 W= V2 R P= R R s = R1 + R 2 + ... 1 1 1 = + + ... R p R1 R 2 ELECTROMAGNETISM φ = BA ɛ = − N Δφ Δt Vs Ns = Vp Np