Technology Grade 8 Paper 2 Sept 2018 Question Paper

an Downloaded from hlayiso.com basic education Department: Basic Education ‘eaygey” REPUBLIC OF SOUTH AFRICA, SASTRI COLLEGE DEPARTMENT OF TECHNOLOGY SEPTEMBER CONTROL TEST 2018 EXAMINER: E MUZA MODERATOR: R RAJKUMAR :LRAMKLOWN DATE: 18/09/18 MARKS; 100 Instructions ~ Answer all the questions using the given number sequence - Use a sharp pencil for all drawings - This paper consists of 4 Pages with 3 questions. QUESTION 1 @ = Answer the foilowing questions by selecting the correct the answer from the given responses @ Write down only the letter of your chosen response. 1.1 Density refers to... A. How much a material resists movement B. How solid a material is? C. How easily a material can resist scratching D. How resistant a material is to change in shape? 1.2 What term is given to a measure of how easy it is to dent a material? A. Rehound hardness 8... aring force C. Scratch hardness D. Indentation hardness 1.3 A compressor is a good example-of a ... A. Hydraulic System B. Pulley system C. Gear System D. Pneumatic System 1.4 The first rule of hydraulics states that ... A. Agas can quickly transfer force B. Pressure exerted on an enclosed fluid is transferred without loss throughout the liquid C. Spur Gears have mechanical advantage D. A hydraulic system uses gas to transfer a la rge force

Downloaded from hlayiso.com 2 1.5 Torque is defined as.. A. The force that acts to lift up a load B. Gear ratio of a gear train C. The turning force of the Driver gear D. The turning direction of the output gear. 1.6 In which direction does conventional! flow A. Left to right B. Negative terminal to Positive Terminal C. Positive terminal to Negative terminal D. Battery to light bulb 1.7 Alamp and LED are examples of what type of devices in a circuit? A. Output device B. Control device C. Input device D. Processing Device 4.8 The abbreviation L E D can be written as follows in full A. Lightning Environment Defence B. Leading Energy Diode C. Light Entry Diode D. Light Emitting Diode 4.9 A POLAR device is a device that... A. Can be inserted into a circuit in any manner B. Is a sensor in an electrical circuit? C. Can only be inserted with the positive connecting to the positive terminal of a battery D. Gives out light energy 4.10 Name the type of pulley system shown in the diagram below A. Fixed pulley 60 N B. Ratchet and Pawl : Cc. Compound Pulley D. Wheel pulleys {10 marks]

Downloaded from hlayiso.com 3 QUESTION TWO 2.1 Explain how you would connect switches to form an AND logic gate. (4) 2.2 Explain how you would connect switches to form an OR logic gate. {4) 2.4 Write a sentence in which you explain Ohin’s Law. (4) 2.5 Give the formula for Ohm’s Law. (4) 2.6 Draw the symbol and name the unit in which the following electrical quantities are measured: a. potential difference (2) b. current (2) C. resistance (2) bage c) Copy the symbol and write in the two missing labels, (2) as State two functions of the device shown in question [2.7b} (4) 2.8 Name a component thai: a. Conducts electrical current in One direction only and lights up when it does so b. Changes resistance when the light intensity on it changes c. Amplifies electrical current (6) ; 2.9 a) What is a diode? (3) b) Explain how to connect a diode correctly in a circutt. (3) c) What is an LED? (3) d) Explain how to connect an LED correctly in a circuit. (3) [50 marks]

Downloaded from hlayiso.com QUEST! 1ON 3 3.1 Draw the symbols for the following electrical devices: a. Light emitting Diode - b. ADiode c. ATransistor d. Light Dependent Resistor (10) 3.2 Draw a circuit diagram with the following devices in the circuit: a. A12N battery b. 2 bulbs/ lamps in series c. An ammeter measuring current in the circuit d. Avoltmeter measuring voltage across the battery {10) e. 2 switches 3.3 Draw.a circuit diagram with the following components: a. 2 cells b. 2 LEDs c. an SPDT switch d. wire to connect the circuit (8) 3.4 Study the circuit diagram below and answer the questions that follow 40K. LED 1 3,4a) Which LED will be brighter? Co _ (2) 3.4b) Explain the difference in brightness between the two LEDS. (4) 3.4c) Explain the two functions of the transistor ina circuit. (4) 3.4d) What is a light dependent resistor (LDR) ? (2) [4omarks]