Chapter 21 Multiple Choice Test
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1 Name: Class: Date: Chapter 21 Multiple Choice Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Suppose you connect more and more light bulbs in series to a battery. What happens to the brightness of each bulb as you add more bulbs? a. The bulbs grow brighter with each new bulb added. b. The bulbs grow dimmer with each new bulb added. c. There is no change in brightness. d. The brightness may increase or decrease depending on the type of light bulb. Study the circuit diagrams shown below (all bulbs are identical): Figure 21-1A 2. Which of the circuit diagrams shown in Figure 21-1A is a series circuit? a. I only b. II only c. III only d. I and II only 3. Which of the circuit diagrams shown in Figure 21-1A is a parallel circuit? a. I only b. II only c. III only d. I and II only 1
2 Name: The diagram below pictures three identical light bulbs, each with a resistance of 1 ohm, which are connected by resistance-free wires. A 9-volt battery supplies energy to the circuit. Figure 21-2A 4. The total resistance for the circuit shown in Figure 21-2A is: ohm. b. 1 volt. c. 3 ohms. d. 3 volts. 5. The current for the circuit shown in Figure 21-2A is: a. 3 amps. b. 3 ohms. c amps. d. 1 ohm. 6. The voltage drop across each light bulb in Figure 21-2A is volt(s). a. 3 b. 1 c d What is the voltage drop across each resistor in the circuit below? volt b. 3 volts c. 4.5 volts d. 9 volts 2
3 Name: 8. The current in a DC series circuit: a. decreases to zero as it travels through the circuit. b. is the same at all points in a circuit. c. is greatest in the resistor with the highest resistance. d. is greatest in the resistor with the lowest resistance. 9. What is the current in each resistor in the circuit below? / 3 ampere b. 1 ampere c. 3 amperes d. 9 amperes 10. The voltage drop across each resistor in the circuit below is volts..5 b. 3 c. 2 d. 9 3
4 Name: 11. The current in each resistor in the circuit below is ampere(s). / 3 b. 1 c. 3 d Which of the following is TRUE about voltage in a series circuit? The total of all voltage drops must: a. equal the total current. b. add up to zero. c. add up to the total voltage supplied by the battery. d. never exceed the total circuit resistance. 13. The voltage drop across each resistor in the circuit below is volt(s). a. 0.2 b. 5 c. 6 d. 12 4
5 Name: 14. The current in each resistor in the circuit is ampere(s). / 3 b. 1 c. 3 d The voltage across the 1-ohm resistor pictured below is volt(s). / 3 b. 2 / 3 c. 1 d What is the current in each resistor in the circuit? / 3 ampere b. 1 ampere c. 3 amperes d. 9 amperes 5
6 Name: 17. What is the voltage drop across each resistor in the circuit below? a. 2 volts b. 4 volts c. 6 volts d. 12 volts 18. Which of the following statements best describes the difference between series and parallel circuits? a. Series circuits are battery circuits and parallel circuits are generator circuits. b. Series circuits have a single path and parallel circuits have two or more paths. c. Series circuits are used in computers and parallel circuits are used in homes. d. Series circuits have one switch in them and parallel circuits have two switches in them. 19. Kirchoff's current law applies to a parallel circuit because it states that: a. current is the same everywhere throughout one entire circuit. b. current is the same everywhere throughout branching circuit paths. c. current stays the same as more branches are added to a parallel circuit. d. all the current flowing into a branch point must flow out again. 20. A student connects three 1-ohm light bulbs to a 9-volt battery in parallel. The total circuit current is ampere(s). b. 3 c. 9 d. 27 6
7 Name: In the circuit shown below, three identical flashlight bulbs are screwed into sockets and are lighted when the circuit is closed: Figure 21-3A 21. Which bulb draws the least amount of current in Figure 21-3A? a. Bulb A b. Bulb B c. Bulb C d. Bulbs B and C draw an equal amount of current but draw less than bulb A. 22. If you unscrewed bulb A in Figure 21-3A: a. only bulb B would go out. b. only bulb C would go out. c. bulbs B and C would go out. d. bulbs B and C would remain lit. 23. The electrical outlets in your home are wired in: a. parallel circuits. b. series circuits. c. two-way circuits. d. three-way circuits. 24. Direct current (DC) and alternating current (AC) differ in: a. the kind of charge flow. b. the amount of charge flow. c. the direction of charge flow. d. the amount of energy per unit of charge. 25. Power is calculated in a circuit by multiplying voltage times_. a. resistance. b. resistance. c. current. d. current. 26. Which of the following is TRUE about alternating current? a. Alternating current flows in one direction only. b. Batteries run on alternating current. c. The electricity in your house uses alternating current. d. Alternating current is easy to recharge. 7
8 Name: 27. What does a power company sell to its customers? a. Power b. Voltage c. Current d. Energy 28. A device that protects a circuit from too much current by creating a break in the circuit is a: a. switch. b. short. c. fuse. d. resistor. 29. The power used by a circuit can be found by: a. using Ohm s law. b. dividing voltage by current. c. adding all resistance. d. multiplying voltage and current. 30. How much would it cost to operate a 100-watt light bulb for 10 hours if the cost of electric energy is 10 cents per kilowatt-hour? dollar b. 10 dollars c. 10 cents d. 1 cent 8
9 Chapter 21 Multiple Choice Test Answer Section MULTIPLE CHOICE 1. ANS: B DIF: basic REF: section ANS: C DIF: basic REF: section 21.1 section ANS: D DIF: basic REF: section 21.1 section ANS: C DIF: intermediate REF: section ANS: A DIF: intermediate REF: section ANS: A DIF: intermediate REF: section ANS: B DIF: intermediate REF: section ANS: B DIF: intermediate REF: section ANS: C DIF: intermediate REF: section ANS: B DIF: intermediate REF: section ANS: B DIF: intermediate REF: section ANS: C DIF: intermediate REF: section ANS: C DIF: intermediate REF: section ANS: C DIF: intermediate REF: section ANS: D DIF: intermediate REF: section ANS: C DIF: intermediate REF: section ANS: C DIF: intermediate REF: section ANS: B DIF: intermediate REF: section 21.1 section ANS: D DIF: advanced REF: section ANS: D DIF: advanced REF: section ANS: D DIF: advanced REF: section ANS: D DIF: advanced REF: section ANS: A DIF: basic REF: section ANS: C DIF: basic REF: section ANS: D DIF: basic REF: section ANS: C DIF: basic REF: section ANS: D DIF: basic REF: section ANS: C DIF: intermediate REF: section ANS: D DIF: intermediate REF: section ANS: C DIF: intermediate REF: section
10 Chapter 21 Multiple Choice Test [Answer Strip] _ B 8. _ B 11. _ C 14. _ B 1. _ C 9. _ C 4. _ C 12. _ D 15. _ A 5. _ B 10. _ C 13. _ C 2. _ A 6. _ D 3. _ B 7. _ C 16.
11 Chapter 21 Multiple Choice Test [Answer Strip] _ C 17. _ D 27. _ C 28. _ D 29. _ B 18. _ D 21. _ C 30. _ D 19. _ D 22. _ D 20. _ A 23. _ C 24. _ D 25. _ C 26.
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Basic voltmeter use. Resources and methods for learning about these subjects (list a few here, in preparation for your research):
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OMPOUN IUITS LOGGING ON Go to www.explorelearning.com and log in using your Username and Password. Select rowse Gizmos icon at the upper left. Select Grades 9 2 Physics Select Electricity and Magnetism
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