Shock Value Regional 2010 Division B

Multiple Choice

Identify the choice that best completes the statement or answers the question.

____1.As in the case of unlike magnetic poles, unlike electric charges

a. / attract each other.
b. / repel each other.
c. / exist in pairs.
d. / do not interact.

____2.What causes charges to move in a circuit?

a. / voltage
b. / energy
c. / electricity
d. / magnetism

____3.An electric current will always follow

a. / the path of least resistance.
b. / a path toward the north pole.
c. / a path toward the south pole.
d. / the path that leads through insulators.

____4.According to Ohm’s law, what is the resistance of a light if the voltage is 9.0 volts and the current is 0.30 amps?

a. / 0.033 ohms
b. / 2.7 ohms
c. / 30 ohms
d. / 8.7 ohms

____5.In a series circuit with three bulbs,

a. / there are many paths for the current to take.
b. / the remaining two bulbs are not affected if one bulb burns out.
c. / all of the bulbs become dimmer as more bulbs are added.
d. / a switch is never used.

____6.In a parallel circuit with three bulbs,

a. / the bulbs must all be located on the same branch.
b. / there is only one path for the current to take.
c. / current from each bulb has its own path.
d. / the overall resistance increases if a new branch is added.

____7.A connection that allows current to take the path of least resistance is called a

a. / short circuit.
b. / series circuit.
c. / parallel circuit.
d. / grounded circuit.

____8.A complete, unbroken path through which electric charges can flow is a(n)

a. / electric circuit.
b. / electrical resistance.
c. / magnetic field line.
d. / magnetic pole.

____9.An example of an insulator is

a. / rubber.
b. / copper.
c. / silver.
d. / iron.

____10.A device used to open and close an electric circuit is a(n)

a. / light bulb.
b. / energy source.
c. / switch.
d. / resistor.

____11.A device that transforms stored chemical energy into electrical energy is a(n)

a. / electrolyte.
b. / electrode.
c. / electrochemical cell.
d. / terminal.

____12.The number of electromagnetic waves passing a given point each second is the

a. / frequency.
b. / amplitude.
c. / crest.
d. / trough.

____13.Magnetic poles that are alike

a. / attract each other.
b. / repel each other.
c. / do not interact.
d. / have the same shape.

____14.The region around a magnet where the magnetic force is exerted is known as its

a. / magnetic pole.
b. / lodestone.
c. / magnetic field.
d. / magnetic domain.

____15.A cluster of billions of atoms that all have magnetic fields lined up in the same way is known as a

a. / magnetic field line.
b. / magnetic pole.
c. / magnetic domain.
d. / permanent magnet.

____16.An example of a common ferromagnetic material is

a. / plastic.
b. / hydrogen.
c. / nickel.
d. / copper.

____17.Magnetic field lines around a bar magnet

a. / are only perpendicular to the magnet.
b. / spread out from one pole and curve around to the other.
c. / cross back and forth over one another.
d. / are perfectly straight.

____18.Where is the magnetic pole in the Northern Hemisphere?

a. / at the geographic north pole
b. / at the geographic south pole
c. / along the coast of Antarctica
d. / in northern Canada

____19.Streams of electrically charged particles flowing at high speeds from the sun make up the

a. / magnetosphere.
b. / solar wind.
c. / magnetic domain.
d. / magnetic field.

____20.If you are in the Northern Hemisphere and see the Northern Lights, you are seeing

a. / an aurora.
b. / a magnetic field.
c. / the magnetosphere.
d. / magnetic field lines.

____21.Earth’s magnetic field can make a magnet out of an iron bar by causing the magnetic domainsto

a. / move back and forth between the north and south poles.
b. / create magnetic field lines.
c. / change the magnetic declination.
d. / line up in the same direction.

____22.Magnetism can be considered a

a. / nuclear property.
b. / physical property.
c. / chemical property.
d. / nonmetallic property.

____23.A spinning electron produces a(n)

a. / element.
b. / magnetic field.
c. / proton.
d. / piece of iron.

____24.What is an electron?

a. / a particle that carries a negative charge
b. / a particle that carries a positive charge
c. / a particle that does not carry an electric charge
d. / the smallest particle of an element that has the element’s properties

____25.Every magnet, regardless of its shape, has two

a. / magnetic poles.
b. / magnetic charges.
c. / magnetic fields.
d. / magnetic domains.

____26.What is one way you can destroy a magnet’s magnetism?

a. / by putting it in water
b. / by cooling it
c. / by heating it
d. / by breaking it into pieces

____27.A temporary magnet

a. / keeps its magnetism for a long time.
b. / cannot be destroyed.
c. / easily loses its magnetism.
d. / has two north poles.

____28.What causes a compass to behave as it does?

a. / Earth’s gravity
b. / Earth’s shape
c. / Earth’s geographic north pole
d. / Earth’s magnetic field

____29.Which type of energy is associated with electric currents?

a. / mechanical energy
b. / electrical energy
c. / magnetic energy
d. / geothermal energy

____30.When a wire with a current is placed in a magnetic field,

a. / electrical energy is transformed into mechanical energy.
b. / mechanical energy is transformed into electrical energy.
c. / the wire becomes a permanent magnet.
d. / the current stops.

____31.The process of generating an electric current from the motion of a conductor in a magnetic field is

a. / conduction.
b. / induction.
c. / motion.
d. / magnetism.

____32.The type of current produced by a battery is

a. / direct current.
b. / alternating current.
c. / magnetic current.
d. / induced current.

____33.What is produced when there is a current in the primary coil of a transformer?

a. / magnetic field
b. / nuclear field
c. / electric field
d. / solar field

____34.An alternating current consists of charges that

a. / turn on and off repeatedly.
b. / move back and forth in a circuit.
c. / flow in one direction only.
d. / flow in one direction in some devices and change direction in others.

____35.The relationship between electricity and magnetism is called

a. / current.
b. / electromagnetism.
c. / a solenoid.
d. / voltage.

____36.Which is NOT a characteristic of a magnetic field produced by a current?

a. / It can be turned on and off.
b. / Its direction can be reversed.
c. / Its strength can be changed.
d. / Its speed can be slowed.

____37.The ability to move an object over a distance is called

a. / electromagnetism.
b. / electricity.
c. / energy.
d. / magnetism.

____38.What device transforms electrical energy into mechanical energy?

a. / an electromagnet
b. / an electric motor
c. / a generator
d. / a solenoid

____39.Which is NOT a part of an electric motor?

a. / armature
b. / brushes
c. / commutator
d. / slip ring

____40.What device increases voltage?

a. / generator
b. / motor
c. / step-down transformer
d. / step-up transformer

Short Answer

Use the diagram to answer each question.

41.Which circuit—A or B—represents a series circuit? ______

42.Which circuit—A or B—is a parallel circuit? ______

43.Which circuit diagram represents circuit B? ______

Use the diagram to answer each question.

44.What is each end of magnet A called?

a. magnetic field

b. magnetic pole

c. magnetic line

d. electromagnetic declination

45.What is each curved line around magnet A called?

a. magnetic field

b. magnetic pole

c. magnetic sphere

d. electromagnetic declination

Use the diagram to answer each question.

46.According to diagram A, in which direction will the upper loop of the wire move?

______

47.What common electrical device is shown in diagram C? ______

Use the diagram to answer each question.

48.What is induced in the secondary coils of the two transformers shown in the diagram?

______

Problem

49.If a circuit has a resistance of 30.5 ohms and a current of 0.05 amps, what is its voltage.

50.A lightbulb with a resistance of 160 ohms is plugged into a 120-volt outlet. What is the current flowing through the bulb?

Shock Value Regional 2010 Division B

Answer Section

MULTIPLE CHOICE

1.ANS:APTS:1DIF:L2REF:p. N-35

OBJ:N.2.1.1 Explain how electric charges interact.BLM:comprehension

2.ANS:APTS:1DIF:L2REF:p. N-49

OBJ:N.2.2.3 Describe what causes electric charges to flow in a circuit.

BLM:comprehension

3.ANS:APTS:1DIF:L2REF:p. N-51

OBJ:N.2.2.4 Explain how resistance affects current.BLM:comprehension

4.ANS:CPTS:1DIF:L2REF:p. N-61

OBJ:N.2.4.1 Explain what Ohm’s law is.BLM:analysis

5.ANS:CPTS:1DIF:L2REF:p. N-64

OBJ:N.2.4.3 Identify how many paths currents can take in series and parallel circuits.

BLM:comprehension

6.ANS:CPTS:1DIF:L2REF:p. N-65

OBJ:N.2.4.3 Identify how many paths currents can take in series and parallel circuits.

BLM:comprehension

7.ANS:APTS:1DIF:L1REF:p. N-71

OBJ:N.2.6.1 Describe measures that help protect people from electrical shocks and short circuits.

BLM:knowledge

8.ANS:APTS:1DIF:L1REF:p. N-46

OBJ:N.2.2.1 Explain how an electric current is produced.BLM:knowledge

9.ANS:APTS:1DIF:L2REF:p. N-47

OBJ:N.2.2.2 Explain how conductors are different from insulators.

BLM:application

10.ANS:CPTS:1DIF:L2REF:p. N-63

OBJ:N.2.4.2 Describe the basic features of an electric circuit.BLM:comprehension

11.ANS:CPTS:1DIF:L1REF:p. N-56

OBJ:N.2.3.2 Explain how an electrochemical cell works.BLM:knowledge

12.ANS:APTS:1DIF:L1REF:p. N-119

OBJ:N.4.2.3 Explain how electromagnetic waves are involved in the transmission of radio and television signals. BLM: knowledge

13.ANS:BPTS:1DIF:L1REF:p. N-8

OBJ:N.1.1.2 Explain how magnetic poles interact.BLM:knowledge

14.ANS:CPTS:1DIF:L2REF:p. N-9

OBJ:N.1.1.3 Describe the shape of a magnetic field.BLM:comprehension

15.ANS:CPTS:1DIF:L1REF:p. N-16

OBJ:N.1.2.2 Describe how magnetic domains are arranged in a magnetic material.

BLM:knowledge

16.ANS:CPTS:1DIF:L2REF:p. N-17

OBJ:N.1.2.2 Describe how magnetic domains are arranged in a magnetic material.

BLM:comprehension

17.ANS:BPTS:1DIF:L2REF:p. N-9

OBJ:N.1.1.3 Describe the shape of a magnetic field.BLM:comprehension

18.ANS:DPTS:1DIF:L2REF:p. N-23

OBJ:N.1.3.1 Explain how Earth is like a bar magnet.BLM:comprehension

19.ANS:BPTS:1DIF:L1REF:p. N-26

OBJ:N.1.3.2 Describe the effects of Earth’s magnetic field.BLM:knowledge

20.ANS:APTS:1DIF:L2REF:p. N-27

OBJ:N.1.3.2 Describe the effects of Earth’s magnetic field.BLM:comprehension

21.ANS:DPTS:1DIF:L2REF:p. N-25

OBJ:N.1.3.2 Describe the effects of Earth’s magnetic field.BLM:application

22.ANS:BPTS:1DIF:L2REF:p. N-7

OBJ:N.1.1.1 Explain what the properties of a magnet are.BLM:application

23.ANS:BPTS:1DIF:L1REF:p. N-15

OBJ:N.1.2.1 Explain how an atom can behave like a magnet.BLM:knowledge

24.ANS:APTS:1DIF:L1REF:p. N-15

OBJ:N.1.2.1 Explain how an atom can behave like a magnet.BLM:knowledge

25.ANS:APTS:1DIF:L1REF:p. N-8

OBJ:N.1.1.2 Explain how magnetic poles interact.BLM:knowledge

26.ANS:CPTS:1DIF:L2REF:p. N-18

OBJ:N.1.2.3 Explain how magnets can be changed.BLM:comprehension

27.ANS:CPTS:1DIF:L1REF:p. N-18

OBJ:N.1.2.3 Explain how magnets can be changed.BLM:knowledge

28.ANS:DPTS:1DIF:L2REF:p. N-23

OBJ:N.1.3.1 Explain how Earth is like a bar magnet.BLM:comprehension

29.ANS:BPTS:1DIF:L1REF:p. N-86

OBJ:N.3.2.1 Explain how electrical energy can be transformed into mechanical energy.

BLM:knowledge

30.ANS:APTS:1DIF:L1REF:p. N-86

OBJ:N.3.2.1 Explain how electrical energy can be transformed into mechanical energy.

BLM:knowledge

31.ANS:BPTS:1DIF:L2REF:p. N-94

OBJ:N.3.3.1 Explain how an electric current can be produced in a conductor.

BLM:comprehension

32.ANS:APTS:1DIF:L2REF:p. N-96

OBJ:N.3.3.1 Explain how an electric current can be produced in a conductor.

BLM:comprehension

33.ANS:APTS:1DIF:L2REF:p. N-100

OBJ:N.3.3.3 Describe the function of a transformer.BLM:comprehension

34.ANS:BPTS:1DIF:L2REF:p. N-97

OBJ:N.3.3.1 Explain how an electric current can be produced in a conductor.

BLM:comprehension

35.ANS:BPTS:1DIF:L1REF:p. N-81

OBJ:N.3.1.1 Explain how an electric current is related to a magnetic field.

BLM:knowledge

36.ANS:DPTS:1DIF:L2REF:p. N-82

OBJ:N.3.1.2 Identify some characteristics of a magnetic field produced by a current.

BLM:comprehension

37.ANS:CPTS:1DIF:L1REF:p. N-86

OBJ:N.3.2.1 Explain how electrical energy can be transformed into mechanical energy.

BLM:knowledge

38.ANS:BPTS:1DIF:L1REF:p. N-88

OBJ:N.3.2.3 Describe what an electric motor does.BLM:knowledge

39.ANS:DPTS:1DIF:L2REF:p. N-89

OBJ:N.3.2.3 Describe what an electric motor does.BLM:comprehension

40.ANS:DPTS:1DIF:L1REF:p. N-100

OBJ:N.3.3.3 Describe the function of a transformer.BLM:knowledge

SHORT ANSWER

41.ANS:

Circuit A is a series circuit because there is only one path for current to take.

PTS:1DIF:L2REF:p. N-64

OBJ:N.2.4.3 Identify how many paths currents can take in series and parallel circuits.

BLM:application

42.ANS:

Circuit B is a parallel circuit. There is more than one path for current to take.

PTS:1DIF:L2REF:p. N-65

OBJ:N.2.4.3 Identify how many paths currents can take in series and parallel circuits.

BLM:application

43.ANS:

circuit diagram E

PTS:1DIF:L2REF:p. N-65

OBJ:N.2.4.3 Identify how many paths currents can take in series and parallel circuits.

BLM:application

44.ANS:

b) magnetic pole

PTS:1DIF:L2REF:p. N-8

OBJ:N.1.1.2 Explain how magnetic poles interact.BLM:analysis

45.ANS:

a) magnetic field line

PTS:1DIF:L2REF:p. N-9

OBJ:N.1.1.3 Describe the shape of a magnetic field.BLM:analysis

46.ANS:

It will move downward.

PTS:1DIF:L2REF:p. N-86

OBJ:N.3.2.1 Explain how electrical energy can be transformed into mechanical energy.

BLM:application

47.ANS:

an electric motor

PTS:1DIF:L2REF:p. N-88

OBJ:N.3.2.3 Describe what an electric motor does.BLM:application

48.ANS:

a current

PTS:1DIF:L2REF:p. N-100

OBJ:N.3.3.3 Describe the function of a transformer.BLM:application

PROBLEM

49.ANS:

1.52 v or volts

PTS:1

50.ANS:

.75 A or .75 I

PTS:1