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Electricity and Magnetism Quiz 6. Which of these circuits are parallel circuits? 1. What do these symbols show? A a cell and a bulb B a cell and a switch C a bulb and a switch B X and Z only D a switch and a motor C Y and Z only 2. Which instrument would you use to measure current? A an ammeter B a cell C a motor D a voltmeter A X and Y only D all of them 7. Which switches must be pressed to make the bulb X come on? 3. How big would the current be at X, Y and Z? A 1 and 2 only A It would be biggest at X and smallest at Z B 1 and 3 only B It would be biggest at Z and C 2 and 3 only smallest at X D all of them C There would be no current at Y D It would be the same in all three places 8. Which of these statements is NOT true? 4. Resistance is a way of saying: A how much electricity is flowing B how hard it is for the electricity to flow C how many cells are in a circuit D how many switches are in a circuit 5. Parallel circuits are used for house lighting: A so they can all be switched on and off together B so you know when one breaks, because all the others go off C so they use a bigger current D so they can all be switched on and off separately A the currents at Q and R add up to give the current at S B the current is the same at P and S C the current is the same at Q and R D the current is the same at P and Q 9. Which statement below is the best definition of voltage? A the number of electrons flowing through a circuit 13. A magnetic field is: A a piece of ground with lots of iron in it B the area around a magnet where it can attract magnetic materials B the amount of energy in a circuit C the current flowing through a circuit D the length of time a battery will last C the area around a magnet where it can attract all materials D the area around a magnet where it repels magnetic materials 10. If the battery in this circuit is providing 6V, what will be the reading on voltmeters 2 and 3? 14. Which diagram shows the shape of a magnet field around a bar magnet? A B C D A both 6V B V2 = 6V and V3 = 3V C V2 = 3V and V3 = 6V 15. The direction of a magnetic field is from: D both 3V A south to north 11. Which of the following materials are magnetic? (Circle all that apply) B west to east A iron B wood D east to west C brass D nickel E steel F cobalt 12. Which of the following statements is NOT true? C north to south 16. Which statement about electromagnets is NOT true? A they can be switched on and off A a north pole attracts a south pole B they need electricity to make them magnetic B a south pole repels a south pole C they are made from coils of wire C a south pole repels a north pole D they are always magnetic D a north pole repels a north pole 17. Which of these changes will make an electromagnet stronger? 20. The shape of the magnetic field around an electromagnet is: A use more coils of wire A like the shape of the field around a bar magnet B use a smaller current C use a wooden core D use fewer coils of wire B like the shape of a tree C straight D square 18. This diagram shows part of the circuit for an electric bell. 21. The magnetic field around a straight piece of wire is: A parallel to the wire B square C circular D a spiral When the switch is pressed, which statement is true? A the electromagnet will repel the armature B there is no current flowing through the circuit C the electromagnet will attract the armature D the electromagnet will light up 22. An iron core will make an electromagnet stronger because: A iron is a strong metal B iron is a magnetic material C the coils of wire can be closer together if there is a core D the core keeps the coils lined up 19. A magnetic field around a wire is caused by: A the plastic coating of the wire B the coils of wire C an iron core inside the wire D an electric current flowing through the wire Answers 1. B 2. A 3. D 4. B 5. D 6. A 7. A 8. D 9. B 10.A 11.A, D, E and F 12.C 13.B 14.C 15.C 16.D 17.A 18.C 19.D 20.A 21.C 22.B 23.