1) Which of these statements is true? a) Plastic is a conductor because it lets electricity flow through it. b) Plastic is an insulator because it lets electricity flow through it. c) Metals are conductors because they let electricity flow through them. d) Metals are insulators because they let electricity 2) Which of these is not a good rule for using electricity safely? a) Never use electrical appliances with wet hands b) Turn off the power pack before you make any changes to your circuit. c) Plug as many things as you can into each socket.Plug as many things as you can into each socket. d) Do not poke things into sockets 3) Which instrument would you use to measure current? a) an ammeter b) a cell c) a motor d) a voltmeter 4) Resistance is a way of saying: a) how much electricity is flowing b) how hard it is for electricity to flow c) how many cells are in a circuit d) how many switches are in a circuit 5) When electricity flows through wires: a) they melt. b) they get cold. c) they can get hot d) nothing changes 6) An electric current is a) a source of energy b) a kind of liquid inside the wires c) tiny particles called electrons flowing through the wires d) tiny particles called atoms flowing through the 7) We need to use models to help us to think about electricity because a) it makes electricity more fun b) electrons are too small to see c) electrons are imaginary d) electricity is not real 8) Which of these circuits are parallel circuits? a) X and Y only b) X and Z only c) Y and Z only d) all of them 9) Which switches must be pressed to make bulb X come on? a) 1 and 2 only b) 1 and 3 only c) 2 and 3 only d) all three of them 10) Parallel circuits are used for house lights: 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 11) Which of these statements is not true? 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 12) Messages are carried in our bodies by: a) blood. b) bones c) nerves d) skin 13) If you touch electrical equipment with wet hands a) you might damage the equipment b) you could get an electric shock c) you might get your hands dirty. d) you might make the equipment dirty 14) What happens if a large electric current flows through your body? a) Your heart could stop working b) Your eyeballs could explode c) Nothing at all d) It will improve your circulation 15) When talking about electrical circuits, what is a pacemaker? a) An electrical device that keeps the heart beating regularly. b) Someone who helps you run at the right speed in a race. c) A machine to measure the length of your stride. d) A computer game.

Circuits DH

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