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Name___________________________________ February 15, 2013 Electricity and Magnetism Unit Test 1. Which of the following materials will a magnet attract? a) copper b) rubber c) iron d) plastic 2. 3. 4. Which statement is TRUE? a) All magnets have the same shape and size. b) All magnets have a north and a south pole. c) All magnets can attract large objects. d) Magnets cannot pull through solids. The south pole of a bar magnet will repel a) a copper nail b) the north end of another magnet c) the south end of another magnet d) an iron nail Look at the drawing below. S N N Which of these is a way to make an electromagnet stronger? a) increasing the electric current flowing through the wire b) replacing the iron core with a copper core c) replacing the copper wire with plastic wire d) wrapping the wire around the iron core a few more times 7. Which material DOES NOT allow electric current to flow through it? a) an insulator b) a magnet c) a conductor d) a metal 8. Electric current DOES NOT flow in a) an open circuit. b) a closed circuit. c) an electromagnet. d) a complete circuit. S If you tried to move these two magnets closer together, what would you feel? a) b) c) d) 6. a push a pull no force a shock 5. Which material is a conductor? a) wood b) glass c) rubber d) aluminum 9. Which part of a circuit starts and stops the flow of electric current? a) battery b) lightbulb c) wire d) switch 10. Which of these is NOT a permanent magnet? a) electromagnet b) refrigerator magnet c) bar magnet d) horseshoe magnet Name___________________________________ February 15, 2013 Electricity and Magnetism Unit Test 11. In order to work, an electromagnet must be part of a) an electric crane. b) an electric circuit. c) an open circuit. d) a battery. 15. Which of these can supply current to an electrical circuit? a) wire b) a battery c) a switch d) a lightbulb 12. A student has four items – an iron bar, a lightbulb, a battery, and a wire. Which three items will the student use to make an electromagnet? a) iron bar, lightbulb, battery b) battery, lightbulb, wire c) battery, iron bar, wire d) iron bar, lightbulb, wire 16. In which part of a circuit is electrical energy change into other forms of energy? a) in the battery b) in the switch c) in the wire d) in the load 13. Which of these materials is an insulator? a) glass b) aluminum c) copper d) steel 14. Look at the diagram below. Which object could replace the switch and still allow the bulb to light up? a) a rubber band b) a strip of cloth c) a steel paper clip d) a wooden toothpick 17. A girl rubs a balloon against her hair. The balloon then has a negative charge. The girl’s hair a) was uncharged before but now has a positive charge. b) was uncharged before but now has a negative charge. c) had a positive charge before but now is uncharged. d) had a negative charge before but now is uncharged. 18. Which of these is caused by static electricity? a) A magnet attracts a paper clip. b) Glue holds two pieces of paper together. c) Socks taken from the clothes dryer stick together. d) Ice sticks to a car’s windshield on a cold winter day. Name___________________________________ February 15, 2013 Electricity and Magnetism Unit Test 19. One of the advantages of an electromagnet over a bar magnet is that an electromagnet a) can easily be turned on and off. b) can be moved from place to place. c) has no magnetic field. d) has a north pole and a south pole. 20. Why is wire covered with plastic when making an electrical circuit? a) Both the wire and plastic are insulators. b) Both the wire and plastic are conductors. c) The wire is an insulator, and the plastic is a conductor. d) The wire is a conductor, and the plastic is an insulator. 21. What part of an electric circuit changes chemical energy into electric energy? a) battery b) lightbulb c) magnet d) wire 22. Why does a rubber balloon stick to a wall after you rub it with wool? a) Unlike charges repel. b) Unlike charges attract. c) Negative charges repel. d) Positive charges attract. 23. A simple circuit has a battery and a wire. Which safety hazard if you leave the battery attached for more than a short period of time? a) The bulb burns out. b) The charge stops flowing. c) The wires get very hot. d) The battery stops working. 24. Julian is writing instructions of how to demonstrate static electricity. Which statement tells how to produce a static charge on a rubber balloon? a) Stick the balloon to a wall. b) Touch the balloon to a magnet. c) Blow up the balloon. d) Rub the balloon with a wool cloth. 25. Both balloons in the picture below have more positive charges that negative charges. What will happen if the balloons are brought near each other? a) The balloons will pull closer to each other. b) The balloons will push away from each other. c) The balloons will not attract or push away from each other. d) One balloon will become positively charged and the other negatively charged.