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Science Focus 2 TEST Chapter 7: Electricity Name: _______________________ Class: __________ Instructions: Write answers in the right-hand column. Date: _______ Score: ___________ / 58 marks Section A Multiple choice (15 marks) 1 2 3 4 5 A neutral object is one that contains: A no charges. B an equal number of positive and negative charges. C only neutrons. D an excess of one type of charge. Which of the following will attract each other? A Two positive charges. B Two negative charges. C A neutral charge and a positive charge. D None of the above. A large device used to demonstrate the effects of static electricity is the: A Electrostatic precipitator. B Vandenburg ioniser. C Van de Graaff generator. D Steffi Graf imitator. A dangerous static charge may build up on an aircraft due to: A charges in the atmosphere being attracted to the aircraft’s metallic body. B chemical reactions involving aircraft exhaust gases. C movement of air against the outside of the aircraft. D electrical discharges from the instrument panel. Lightning occurs when: A charge flows between clouds. B charge flows between a cloud and the ground. C charge flows from one part of a cloud to another part of the same cloud. D all of the above. Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7 1 1 1 1 1 Science Focus 2 TEST Chapter 7: Electricity 6 7 8 Lines representing electric fields are: A always evenly spaced. B always curved. C closer together near charges. D drawn with arrows showing the direction a negative charge would move if free to do so. Voltage is the: A number of charges passing a point in a circuit every second. B measure of the energy given to or lost by moving charges. C number of charges in a cell. D time taken for a charge to move around a circuit once. 1 1 Which circuit below shows how to measure voltage and current for a single globe in a circuit? 1 9 10 Which of the following is a good conductor? A Plastic. B Copper. C Water. D Air. In an electric circuit, resistance is: A a connection terminal that is difficult to unscrew or tighten. B something which does not allow any charge to flow. C a component connected the wrong way around. D something that restricts the flow of charge, transferring energy in the process. Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7 1 1 Science Focus 2 TEST Chapter 7: Electricity 11 12 A photovoltaic cell is a: A solar cell. B technical term for a light bulb. C high voltage source. D circuit symbol used to denote a voltage source such as a battery or cell. 1 The circuit below contains: 1 A B C D 13 3 globes in parallel. 3 globes in series. 1 globe in series with 2 globes in parallel. 2 globes in parallel with one globe in series. When a globe is removed from the circuit below: 1 A B C D 14 the other two will continue to glow just as brightly as before. the other two will glow more brightly than before. the other two will glow less brightly than before. all globes will go out. Identify what the unit ‘ampere’ is used to measure. A Current B Voltage C Resistance D Electricity Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7 1 Science Focus 2 TEST Chapter 7: Electricity 15 What would happen if all the power points in part of your home were wired in series? A The voltage would be too great and damage anything plugged into one of them. B If more than one power point was being used, the voltage would be too small for devices to operate normally. C They would work normally as long as used sensibly (i.e. not overloaded) power points are frequently wired in parallel with each other. D All power points would have to be ‘on’ in order for any to work. 1 Section B Written answers (43 marks) 1 Explain the science behind a situation in which a person experiences a static electricity effect. 3 2 Predict where you think the word ‘photostat’ comes from. 2 3 An electric charge produces an electric field. Explain what happens to the size of an electric field when: a you move closer to the charge. b the size of the charge is increased. Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7 2 Science Focus 2 TEST Chapter 7: Electricity 4 Identify several electric field lines by drawing them on the diagram below. 3 5 Explain why the metal foil strips at the lower end of the electroscope below repel each other, despite the rod not touching the device. 2 6 Describe the direction of conventional current in the conductor below. 2 7 Complete these sentences. a ________ is a measure of the rate at which charge flows, and is measured in ________. 4 b ________ is a measure of the energy given to or lost by charges, and is measured in ________. 8 Identify the basic ‘ingredients’ in a cell or battery. 2 Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7 Science Focus 2 TEST Chapter 7: Electricity 9 a Define a conductor. b Define an insulator. c Identify two examples of a conductor. 4 d Identify two examples of an insulator. 10 Identify two examples of a resistance in a circuit. 2 11 State the reading on each meter below. Each meter is either a voltmeter or ammeter and is connected correctly. Assume globes in the same circuit are identical. a 10 b Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7 Science Focus 2 TEST Chapter 7: Electricity 12 Consider the circuit below. Identify which other globes would go out if 4 a globe B blows. b globe D blows. c globe A blows. d a copper wire is used to create a short circuit from X to Y (assume no globes blow). 13 Consider the party light circuit below. 3 a What would be the effect on the other globes in the circuit if one globe blew? b How could the circuit be redesigned so that if a globe blows, none of the others do? Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7