<p> KS3 Physics revision questions 1 - Electricity, Magnetism, Electromagnetism</p><p>Level 4 Questions</p><p>1. The diagram below shows a pen.</p><p>The pen is held up by two magnets, one in the stand and the other in the pen.</p><p> magnet in stand N</p><p>S</p><p> magnet in pen</p><p> pen</p><p> stand</p><p>(a) On the dotted lines above, label the North pole and the South pole of the magnet in the pen.</p><p>Use the letters N and S. 1 mark</p><p>Ballard School 1 (b) John put a block of metal between the two magnets as shown below.</p><p> magnet in stand N</p><p>S</p><p> block of metal</p><p> magnet in pen</p><p> stand</p><p>The block of metal became a magnet.</p><p>(i) On the dotted lines above, label the North poles and the South poles of both the block of metal and the magnet.</p><p>Use the letters N and S. 1 mark</p><p>(ii) What metal could the block be made of?</p><p>...... 1 mark</p><p>Ballard School 2 (c) John repeated the experiment using a piece of wood instead of a block of metal. The pen did not stay up. Give the reason for this.</p><p>...... 1 mark maximum 4 marks</p><p>2. (a) The diagram below shows a circuit with a two-way switch, S.</p><p>Rosie puts the switch in the position shown below.</p><p>S</p><p>R</p><p>P Q</p><p>Complete the table below to show if the bulbs are on or off. Write on or off for each bulb.</p><p> bulb on or off</p><p>P</p><p>Q</p><p>R</p><p>1 mark</p><p>(b) Give the name of the part that provides energy for the circuit.</p><p>...... 1 mark</p><p>Ballard School 3 (c) The diagrams below show a light-bulb over a staircase of a model house.</p><p>There is a two-way switch at the bottom of the stairs and another two-way switch at the top.</p><p>Under each diagram, tick one box to show if the bulb is on or off. The first one has been done for you.</p><p> on on</p><p> off off</p><p> on on</p><p> off off</p><p>2 marks maximum 4 marks</p><p>Ballard School 4 3. A compass needle is a small magnet with a North pole, N, and a South pole, S.</p><p>Ruth placed two compasses onto a piece of card. Both compass needles pointed in the direction shown below.</p><p> card</p><p> compass</p><p>N N</p><p>S S</p><p> compass needle</p><p>Ballard School 5 (a) Ruth placed a bar magnet with its South pole between the two compasses. The compass needles moved as shown below.</p><p>On the diagram below, label the North pole and South pole of each compass needle. Use the letters N and S.</p><p> bar magnet</p><p>1 mark</p><p>Ballard School 6 (b) Ruth turned the bar magnet round so that the North pole was between the two compasses.</p><p>On the diagram below, label the North pole and South pole of each compass needle now. Use the letters N and S.</p><p> bar magnet</p><p>1 mark</p><p>(c) Ruth repeated her experiment with an aluminium bar instead of a bar magnet.</p><p>What happened to the compass needles?</p><p>...... 1 mark maximum 3 marks</p><p>Ballard School 7 4. Daniel connected up the following circuit, using a battery, three bulbs and a switch.</p><p>A B</p><p>L</p><p>J K</p><p>(a) The switch is shown in position A. Which bulb is lit up?</p><p>...... … 1 mark</p><p>(b) Daniel moves the switch from position A to position B.</p><p>What, if anything, happens to bulbs J, K and L?</p><p> bulb J: ...... </p><p> bulb K: ...... </p><p> bulb L: ...... 2 marks</p><p>(c) Daniel uses a piece of copper wire to connect points P and Q.</p><p> copper wire A B P Q</p><p>L</p><p>J K</p><p>Ballard School 8 Which of the bulbs, if any, are lit up?</p><p>...... 1 mark Maximum 4 marks</p><p>5. Alice connects four light bulbs for her model house, as shown. She puts the bulbs into the holes in the back wall.</p><p>(a) When Alice turns the switch on, the bulbs do not light up. The batteries are not flat. None of the bulbs is broken. Why do the bulbs not light up?</p><p>...... 1 mark</p><p>(b) Alice makes the circuit work. When she turns the switch on, the bulbs are not very bright. What must Alice add to the circuit to make the bulbs brighter?</p><p>...... 1 mark</p><p>Ballard School 9 (c) The four bulbs in the circuit are the same. Which statement is correct? Tick the correct box.</p><p>Each bulb is the Each bulb is a same brightness. different brightness.</p><p>The bulbs at the The bulbs at the top are brighter. bottom are brighter.</p><p>1 mark</p><p>The diagrams show two ways to write the model house.</p><p> bulb A</p><p> bulb B bulb C bulb B</p><p> bulb C bulb A bulb D</p><p> bulb D</p><p> circuit 1 circuit 2</p><p>(d) (i) In circuit 1, bulb B breaks and goes out. What happens to the other bulbs in this circuit?</p><p>...... </p><p>...... 1 mark</p><p>(ii) In circuit 2, bulb C breaks and goes out. What happens to the other bulbs in this circuit?</p><p>...... </p><p>...... 1 mark</p><p>Ballard School 10 (e) In circuit 2, Alice adds another switch so that she can turn bulb A off while the other bulbs stay on. Write the letter S on circuit 2 to show where Alice should add the switch. 1 mark Maximum 6 marks</p><p>Ballard School 11</p>