McGraw-Hill Science 2000, Texas Edition TAKS Practice Test. Grade 4, Chapter 9 Paths for Electricity. Name. Date

Transcription

1 McGraw-Hill Science 2000, Texas Edition TKS Practice Test Grade 4, hapter 9 Paths for Electricity Name ate

2 Use the illustrations and your knowledge of science to answer Questions 1 to 4. ircuit ircuit ircuit 1 In which of the circuits, if any, will at least one bulb light? ircuits and only ircuits and only ircuit only None of the circuits 3 In ircuit, what happens if a wire is added to connect the top terminal of the -cell and one of the bulbs? Only one bulb lights. oth bulbs light. Neither bulb lights. Static electricity is created. 2 How does the wood react to electricity in ircuit? The wood is a conductor. Electricity passes through it. The wood is an insulator. Electricity does not pass through it. The wood builds up static electricity. The wood builds up current electricity. 4 Which of these safety rules would be best to follow when using wires, light bulbs, and -cells (batteries)? Wear safety goggles. Wear a laboratory apron. Never touch the terminals of a -cell. Never open a -cell. Macmillan/McGraw-Hill TKS Science Grade 4, hapter 9 1

3 Use the illustrations below and your knowledge of science to answer Questions 5 and 6. 5 What question could this set of materials be used to answer? If the power of a circuit is increased, will a bulb shine brighter? In which direction does current flow in an electrical circuit? Which of the objects (spoon, straw, can, and toy car) conduct electricity? Which of the objects (spoon, straw, can, and toy car) are made only of metal? 6 What property of the spoon would change the way it acts in an electrical circuit? Size Shape Mass omposition (metal, plastic, or wood) Macmillan/McGraw-Hill TKS Science Grade 4, hapter 9 2

4 Use the illustrations and your knowledge of science to answer Questions 7 to 9. Series ircuit Parallel ircuit 7 What if one bulb in the series circuit is removed from its socket? What happens to the other bulb? The bulb stays lit. The bulb goes out. The bulb brightens, then burns out quickly. The bulb dims very slowly. 8 What if one bulb in the parallel circuit is removed from its socket? What happens to the other bulb? The bulb stays lit. The bulb goes out. The bulb brightens, then burns out quickly. The bulb dims very slowly. Macmillan/McGraw-Hill TKS Science Grade 4, hapter 9 3

5 9 What do the arrows represent in the drawings? The flow of particles with a negative electrical charge. The flow of light through the electrical circuit. The flow of heat through the electrical circuit. The flow of magnetism through the electrical circuit. 10 How could you show that electricity can be used to make sound? Listen to a -cell as you shake it. Listen to a -cell as you connect it into a circuit. onnect an electric buzzer or doorbell into a circuit. onnect an electric buzzer or doorbell to a block of wood. 11 Why is an electrical wire coated in plastic? Plastic conducts electricity. Plastic insulates electricity, keeping it inside the wire. Plastic helps the wire bend around corners. Plastic conducts heat and light. 12 bolt of lightning is an example of. an electrical circuit. kinetic energy solar energy. a discharge of static electricity. Macmillan/McGraw-Hill TKS Science Grade 4, hapter 9 4

6 Use the following passage and your knowledge of science to answer Questions 13 to 14. fuse contains a thin strip of metal. Electricity runs through the metal strip. When dangerously high current flows through the fuse, the strip melts. urrent stops flowing. ircuit breakers work differently than fuses. In a circuit breaker, a metal strip expands with the current. When the current becomes dangerously high, the metal strip opens a switch that stops current. Once the metal strip melts in a fuse, the fuse cannot be used again. circuit breaker, however, can be reset over and over again. 13 Why are fuses and circuit breakers used in people s homes? Each stops electrical current when someone turns off a switch. Each stops electrical current when an oven becomes too hot. Each stops electrical current when a circuit becomes dangerously hot. Each acts like a -cell in a flashlight battery. 14 Most fuses cost less money than circuit breakers. Why might a home builder choose to use circuit breakers instead of fuses? ircuit breakers work better than fuses in homes that use lots of electricity. ircuit breakers work better than fuses in homes that use only a little electricity. Unlike fuses, circuit breakers stop short circuits. Unlike fuses, circuit breakers can be used many times. Macmillan/McGraw-Hill TKS Science Grade 4, hapter 9 5

7 NSWER KEY and ORRELTIONS: Question nswer TKS McGraw-Hill Science Grade 4 textbook 1 5.8, 5.7 p p p p , 5.7 p p , 5.5 p , 5.5 p pp. 292, p pp. 295, p p p. 322 Macmillan/McGraw-Hill TKS Science Grade 4, hapter 9 6