7th Grade - Chapter 7 Test
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____ 1. Light waves are electromagnetic waves. _________________________
____ 2. Transverse waves move particles back and forth along the same direction in which the waves travel. _________________________
____ 3. Mechanical waves can travel either through matter or through empty space. _________________________
____ 4. The frequency of a wave is the number of wavelengths that pass by a point each second. _________________________
____ 5. The amount of diffraction depends on the size of the obstacle and the wavelength of the wave. _________________________
____ 6. The energy carried by a sound wave is blocked by collisions between the particles in the material the wave is traveling in. _________________________
____ 7. A vibrating drumhead produces a compression each time it moves upward and a reflection each time it moves downward. _________________________
____ 8. The intensity of a sound wave increases as the wave spreads out from the source of the sound. _________________________
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 9. What are the high and low points of a transverse wave called?
a.
coils and rarefactions
b.
compressions and rarefactions
c.
crests and troughs
d.
crests and waves
____ 10. Ben is writing a paper about amplitude. Which statement about amplitude is true?
a.
Amplitude has nothing to do with vibration.
b.
Tightly compressed waves have low amplitudes.
c.
Waves with larger amplitudes carry more energy.
d.
You cannot demonstrate amplitude by shaking the end of a rope.
____ 11. Mr. Lee’s class is studying waves and particles. How are waves and particles similar?
a.
Both have an electric charge.
b.
Both have mass and volume.
c.
Both have the same properties.
d.
Both transport energy.
____ 12. Jessica made a table of sounds and their corresponding decibels.
Which is the BEST guess for the decibels of an average conversation between two people?
a.
10 dB
b.
45 dB
c.
98 dB
d.
120 dB
____ 13. Cheryl hears the sound of a guitar playing. What kind of waves are reaching her ears?
a.
compressional
b.
electromagnetic
c.
transverse
d.
refraction
____ 14. What is the difference between mechanical waves and electromagnetic waves?
a.
Electromagnetic waves can only travel in matter.
b.
Mechanical waves can only travel in space.
c.
Only electromagnetic waves can travel in matter and space.
d.
Only mechanical waves can travel in matter and space.
____ 15. Anna made a Venn diagram to compare X rays and microwaves.
Which is the correct description of the intersecting area of this diagram?
a.
has color
b.
has no energy
c.
part of the electromagnetic spectrum
d.
visible to humans
____ 16. How can you describe the frequency of a wave?
a.
damage done to the ground after an earthquake
b.
distance between a crest and a trough
c.
distance between two points on a wave
d.
number of wavelengths passing a point each second
____ 17. Duane is writing a report about sound. Why does sound have greater intensity if a person is standing right next to it?
a.
Loudness and intensity are the same thing.
b.
The sound has less of an amplitude.
c.
The sound waves have not yet spread out or lost energy.
d.
They are experiencing a sound’s speed, not its intensity.
____ 18. Which unit is used to measure the intensity of a sound wave?
a.
decibels
b.
hertz
c.
joules
d.
nanometers
____ 19. Which electromagnetic waves have the highest energy, highest frequency, and shortest wavelengths?
a.
infrared waves
b.
radio waves and microwaves
c.
ultraviolet waves
d.
X rays and gamma rays
____ 20. Why are light waves considered transverse waves?
a.
They contain an electric part and move very quickly.
b.
They have a lot of intensity and low frequency.
c.
They vibrate at right angles to the direction they travel.
d.
They have a short wavelength and great amplitude.
____ 21. Which electromagnetic wave has a frequency closest to that of visible light?
a.
gamma
b.
microwave
c.
radio
d.
ultraviolet
____ 22. This figure shows a _____.
a.
compressional wave
c.
electromagnetic spectrum
b.
decibel scale
d.
transverse wave
____ 23. In the figure shown, point A is called a _____.
a.
amplitude
c.
rarefaction
b.
crest
d.
trough
____ 24. In the figure shown, point B is called a _____.
a.
compression
c.
diffraction
b.
crest
d.
trough
____ 25. The amplitude of a compressional wave depends on the _____.
a.
density of material in compressions and rarefactions
b.
distance between crests and troughs
c.
number of wavelengths that pass by a point each second.
d.
vibration of electric and magnetic parts
____ 26. Which of the following correctly states the equation for calculating wave speed?
a.
wave speed = frequency / wave length
b.
wave speed = wave length / frequency
c.
wave speed = wave length + frequency
d.
wave speed = wave length x frequency
____ 27. The SI unit for frequency is the _____.
a.
decibel
c.
hertz
b.
degree
d.
meter
____ 28. In the figure shown, the light waves change direction as a result of _____.
a.
diffraction
c.
refraction
b.
reflection
d.
reverberation
____ 29. In the figure shown, the directional change of the light waves occurs because _____.
a.
light waves travel faster through air than water
b.
light waves travel faster through water than air
c.
the angle of reflection of waves always equals the angle of incidence
d.
waves carrying less energy produce light with lower intensity
____ 30. Sound waves produced by a vibrating object are _____.
a.
compressional waves
c.
seismic waves
b.
electromagnetic waves
d.
transverse waves
____ 31. What conclusion can you draw from the information shown in this figure?
a.
Sound intensity is greater in water than in air.
b.
Sound waves can move more quickly through liquids than through solids.
c.
The frequency of sound increases with wave speed.
d.
The speed of sound varies with the material in which the waves travel.
____ 32. Based on the figure shown, sound waves travel most slowly through which of the following?
a.
air
c.
rubber
b.
glass
d.
water
____ 33. Based on the figure shown, about how far can sound travel in water in 2.5 s if the water temperature is 25°?
a.
375 m
c.
875 m
b.
600 m
d.
3,750 m
____ 34. Loudness is the human perception of sound wave _____.
a.
frequency
c.
pitch
b.
intensity
d.
speed
____ 35. The part of the ear that amplifies sound vibrations is the _____.
a.
cochlea
c.
inner ear
b.
middle ear
d.
outer ear
____ 36. The process of detecting objects by bouncing sounds off them is called _____.
a.
diffraction
c.
reverberation
b.
echolocation
d.
vibration
____ 37. If the distance between the crest and trough of a wave is 1.2 m, the wave’s amplitude is _____.
a.
0.6 m
c.
2.4 m
b.
1.2 m
d.
4.8 m
____ 38. Sound intensity is measured in _____.
a.
decibels
c.
infrared waves
b.
hertz
d.
nanometers
____ 39. The brightness of a light is determined by _____.
a.
air temperature
c.
wavelength
b.
intensity of light waves
d.
wave speed
____ 40. The shortest radio waves are called _____.
a.
gamma rays
c.
microwaves
b.
infrared waves
d.
ultraviolet waves
____ 41. The electromagnetic waves with the highest energy are _____.
a.
gamma rays
c.
sound waves
b.
infrared waves
d.
ultraviolet waves
____ 42. How much of the energy emitted by the Sun reaches Earth?
a.
all
c.
most
b.
a small fraction
d.
nearly half
____ 43. This figure shows an illustration of a _____.
a.
compressional wave
c.
radio wave
b.
electromagnetic wave
d.
reverberation
____ 44. The wavelength of the wave shown in this figure is the distance from _____.
a.
compression to compression
c.
crest to crest
b.
compression to rarefaction
d.
crest to trough
____ 45. The more energy that the wave shown in this figure carries, the greater is its _____.
a.
amplitude
c.
frequency
b.
density
d.
pitch
____ 46. In the figure shown, if angle i increases slightly, angle r will _____.
a.
decrease
c.
increase
b.
disappear
d.
remain the same
____ 47. The “normal” in the figure shown is a line that makes an angle of _____.
a.
30 degrees
c.
90 degrees
b.
45 degrees
d.
180 degrees
____ 48. Based on the figure shown, which of the following sounds would be most likely to cause people discomfort?
a.
chain saw
c.
rustling leaves
b.
noisy restaurant
d.
vacuum cleaner
____ 49. A 10 decibel increase in intensity is generally perceived as a doubling in loudness. In the figure shown, each of the sounds shown is more than twice as loud as a vacuum cleaner except a _____.
a.
chain saw
c.
noisy restaurant
b.
jet plane taking off
d.
power mower
____ 50. Theaters and concert halls often place curtains on the walls in order to _____.
a.
absorb the energy of sound waves
c.
prevent refraction
b.
increase sound reflection
d.
raise the intensity of sound
____ 51. If the frequency of a sound wave is 7.0 Hz, and the sound wave travels through the air at a speed of 350 m/s, what is the wavelength?
a.
0.02 m
c.
343 m
b.
50 m
d.
2,450 m
____ 52. Light travels fastest in _____.
a.
empty space
c.
solids
b.
fresh water
d.
seawater
____ 53. The intensity of light waves is a measure of the _____.
a.
distance the waves have traveled
c.
motion of air particles
b.
energy carried by the waves
d.
speed of the waves
____ 54. In order for the human body to make vitamin D, some exposure to what kind of light waves is necessary?
a.
infrared waves
c.
ultraviolet waves
b.
microwaves
d.
X rays
____ 55. As the frequency of a sound gets higher, so does its _____.
a.
intensity
c.
pitch
b.
loudness
d.
wavelength
____ 56. All of the following are transverse waves except _____.
a.
gamma rays
c.
sound waves
b.
radio waves
d.
X rays
____ 57. The electromagnetic waves with the highest frequency are _____.
a.
gamma rays
c.
radio waves
b.
microwaves
d.
visible light
____ 58. Waves that can travel only through matter are known as ____ waves.
a.
energy
c.
electromagnetic
b.
mechanical
d.
light
____ 59. ____ is measured in meters.
a.
Frequency
c.
Wavelength
b.
Wave speed
d.
Intensity
____ 60. Frequency is measured in units called ____.
a.
decibels
c.
hertz
b.
lambda
d.
wavelength
____ 61. Night vision goggles use ____ waves to locate people in the dark.
a.
infrared
c.
radio
b.
ultraviolet
d.
gamma
____ 62. The wavelength of a ____ wave is the distance between two adjacent crests or adjacent troughs.
a.
rolling
c.
transverse
b.
compressional
d.
seismic
____ 63. To find the frequency of a compressional wave, you would count the number of ____ that pass by a point each second.
a.
crests
c.
diffractions
b.
refractions
d.
rarefactions
Completion
Complete each statement.
64. ____________________ in the retina of the eye detect light and send signals to the brain.
65. In the figure shown, the ____________________ is the transparent layer of the eye through which light first passes.
66. In the figure shown, the ____________________ is the flexible part of the eye that changes shape to enable the eye to focus on objects that are near or far.
67. In the figure shown, the ____________________ is the part of the eye on which light waves are focused, forming an image.
68. In the figure shown, the word needed to complete box 2 of the flowchart is ____________________.
69. In the figure shown, the word needed to complete box 3 is ____________________.
70. In the figure shown, the word needed to complete box 4 is ____________________.
Write the name of the type of wave described in the space beside each phrase.
transverse wave
compressional wave
electromagnetic wave
71. can travel through matter or empty space ____________________
72. contains high points called crests ____________________
73. contains rarefactions in the wave ____________________
74. contains electric and magnetic parts ____________________
75. detected by the ear ____________________
76. detected by the eye ____________________
Matching
Match each term with the correct statement below.
a.
visible light
f.
pitch
b.
reverberation
g.
intensity
c.
diffraction
h.
wavelength
d.
ultraviolet waves
i.
infrared waves
e.
refraction
j.
wave
____ 77. disturbance that moves through matter or space
____ 78. distance between one point on a wave and the nearest point moving with the same speed and direction
____ 79. change in direction of a wave when it changes speed as it travels from one material to another
____ 80. bending of waves around an object
____ 81. human perception of the frequency of sound
____ 82. repeated echoes
____ 83. amount of energy that a wave carries past a certain area each second
____ 84. waves emitted by all warm bodies
____ 85. waves that can cause sunburn
____ 86. electromagnetic waves that people can see
Match the terms with the correct phrase below.
a.
compressional wave
i.
pitch
b.
diffraction
j.
refraction
c.
electromagnetic spectrum
k.
reverberation
d.
electromagnetic wave
l.
transverse wave
e.
frequency
m.
ultraviolet waves
f.
infrared waves
n.
wave
g.
intensity
o.
wavelength
h.
law of reflection
____ 87. the complete range of electromagnetic wave frequencies and wavelengths
____ 88. waves with wavelengths between 0.001 meters and 700 billionths of a meter
____ 89. causes particles in matter to move back and forth along the same direction in which the wave travels
____ 90. the distance between one point on a wave and the nearest point just like it
____ 91. the angle that the incoming wave makes with the normal equals the angle that the outgoing wave makes with the normal
____ 92. the amount of energy that a wave carries past a certain area each second
____ 93. the human perception of the frequency of sound
____ 94. repeated echoes
____ 95. waves with wavelengths between about 400 billionths and 10 billionths of a meter
____ 96. a disturbance that transfers energy through matter or space
____ 97. causes particles in matter to move at right angles to the direction in which the wave travels
____ 98. waves that can travel through matter or space
____ 99. the change in direction of a wave when it travels from one material to another
____ 100. the bending of a wave around an object
____ 101. the number of wavelengths that pass by a point each second
Match the terms with the correct descriptions below.
a.
diffraction
e.
refraction
b.
electromagnetic wave
f.
reverberation
c.
frequency
g.
transverse wave
d.
pitch
h.
wavelength
____ 102. the distance between one point on a wave and the nearest point just like it
____ 103. the number of wavelengths that pass by a point each second
____ 104. the bending of a wave around an object
____ 105. the human perception of the frequency of sound
____ 106. a wave that can travel through matter or space
____ 107. repeated echoes
____ 108. causes particles in matter to move at right angles to the direction in which the wave travels
____ 109. the change in direction of a wave when it travels from one material to another
Short Answer
110.
How are seismic waves and sound waves alike and different?
111.
Daria’s class is studying transverse waves. They are using rope as a material in their experiments.
Part A How can the class use the rope to demonstrate wavelength?
Part B How can the class use the rope to demonstrate amplitude?
112.
What is the electromagnetic spectrum?
113.
What affect does temperature have on the speed of sound through a material?
114.
How is the intensity of sound waves related to amplitude?
115.
What are the three main parts of the human ear, and what are their basic functions?
116.
Why is it unrealistic for an author to write about a spacecraft traveling faster than the speed of light?
117.
What is the relation between the frequency of electromagnetic waves and their wavelength?
118.
How do X rays help doctors see inside the human body?
119.
What is the difference between nearsightedness and farsightedness?
120.
How do rod and cone cells differ in function?
121. Explain the relationship between loudness and sound intensity.
122. What are the three parts of the human ear and what is the function of each part?
123. Explain how humans see color.
Use the diagram to answer the following questions.
124. Identify part 1 in the diagram above and describe its function.
125. Identify part 2 in the diagram above and describe its function.
126. Identify part 3. If part 3 failed to function in a person, what would an implant have to do to imitate the function of this part of the ear?
127. Complete the following concept map.
128. A sound wave with a frequency of 15,000 Hz travels through iron with a speed of 5,130 m/s. What is the wavelength of this wave?
129. A radio wave has a wavelength of 0.3 m and travels at a speed of 300,000,000 m/s. What is the frequency of this wave?
130. If a light wave strikes the mirror as shown below, what is the angle of reflection? Explain your answer.
Essay
131. Describe how sound waves travel through matter.
132. Compare and contrast refraction and diffraction.
Friday, January 25, 2008
6th Grade Chapter 19 Test
6th Grade Chapter 19 Test
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____ 1. The positive electrode in a dry-cell battery is a zinc rod. _________________________
____ 2. In a battery, chemical energy is transformed into electrical energy. _________________________
____ 3. Charging by contact occurs when an electric field rearranges the charges in an object. _________________________
____ 4. Unlike magnetic poles repel each other. _________________________
____ 5. The amount of positive charge on a proton equals the amount of negative charge on a neutron. _________________________
____ 6. As the amount of charge on either of two charged objects increases, the electric force between the objects decreases. _________________________
____ 7. An electromagnet is a current-carrying wire wrapped around a copper core. _________________________
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 8. Which of these particles can be found in the nucleus of an atom?
a.
electrons
b.
electrons and protons
c.
electrons, protons, and neutrons
d.
neutrons and protons
____ 9. Why do we say that atoms are neutral?
a.
They contain neutrons.
b.
They make up all matter.
c.
They have zero total charge.
d.
They remain motionless.
____ 10. Which of the following does NOT affect the electric force between objects?
a.
the amount of charge on the objects
b.
the distance between the objects
c.
the size of the objects
d.
whether the objects have like or unlike charges
____ 11. Why are electrically charged objects able to exert force on one another without touching?
a.
They are affected by gravity.
b.
They are surrounded by a magnetic field.
c.
They are surrounded by an electric field.
d.
They create a current.
____ 12. What happens to an object when it picks up excess electrons by contact?
a.
It becomes an insulator.
b.
It becomes negatively charged.
c.
It becomes positively charged.
d.
It gives off a bright spark.
____ 13. Which word describes material in which electric charges move easily?
a.
conductor
b.
field
c.
insulator
d.
magnet
____ 14. Why does a wire remain electrically neutral?
a.
because electrons flow in and out at the same rate
b.
because it has more protons than electrons
c.
because it is coated in neutrons
d.
because it stays charged by flowing electrons
____ 15. Cary and Alana are making an electromagnet for a class project. To make the electromagnet, they wrap a current-carrying wire around an iron core. What is the relationship between electricity and magnetism that makes it possible for them to create an electromagnet?
a.
A moving electric charge is surrounded by a magnetic field.
b.
Magnets are electrically charged objects.
c.
The wire conductor is made of magnetic material.
d.
All circuits are temporary magnets.
____ 16. Ricardo is studying different changes in electric circuits. What happens when he increases the voltage in a circuit?
a.
The circuit breaks.
b.
The current increases.
c.
The flow of electrons slows down.
d.
The resistance increases.
____ 17. Which device converts mechanical energy into electrical energy by rotating a wire loop inside a magnetic field?
a.
a battery
b.
a series circuit
c.
an electric generator
d.
an electromagnet
____ 18. Rita is writing a report that compares magnets and electric charges. Which of these is NOT a characteristic shared by magnets and electric charges?
a.
Their forces are stronger as they move closer together.
b.
Their like charges repel and unlike charges attract.
c.
They are surrounded by fields that exert force at a distance.
d.
They have charges arranged in domains.
____ 19. Kendra and Jamal are looking at this diagram in a science book. The diagram shows the magnetic domains of the same object before and after it is acted on by the force of a permanent magnet.
What type of object does this diagram show?
a.
a bar magnet
b.
a compass
c.
an electromagnet
d.
a temporary magnet
____ 20. Which of the following transforms mechanical energy to electric energy?
a.
a lightning rod
b.
an electromagnet
c.
an electric generator
d.
a parallel circuit
____ 21. A material through which electrons can move easily is a _____.
a.
conductor
c.
insulator
b.
electromagnet
d.
nucleus
____ 22. Each of the following is an example of an insulator except _____.
a.
copper
c.
rubber
b.
glass
d.
wood
____ 23. An atom has equal numbers of protons and _____.
a.
electrons
c.
ohms
b.
neutrons
d.
volts
____ 24. The process of providing a path to drain excess charge into Earth is called _____.
a.
electromagnetic induction
c.
lightning
b.
grounding
d.
resistance
____ 25. Which of the following correctly states Ohm's Law?
a.
resistance = voltage + current
c.
voltage = current / resistance
b.
resistance = voltage x current
d.
voltage = current x resistance
____ 26. An object with equal amounts of positive and negative charge is electrically _____.
a.
charged
c.
neutral
b.
negative
d.
positive
____ 27. If the distance between two charged objects increases, the electric force between them _____.
a.
decreases
c.
remains the same
b.
increases
d.
stops
____ 28. Every proton and electron is surrounded by a(n) _____.
a.
electric circuit
c.
insulator
b.
electric field
d.
magnetic pole
____ 29. Which of the following is an example of charging by induction?
a.
clothes sticking together after tumbling in a dryer
b.
making a paper clip into a temporary magnet
c.
rubbing a balloon against a person's hair
d.
sticking a balloon to a wall after rubbing it on a sweater
____ 30. When an object has more negative charge than positive charge, the result is called a _____.
a.
electric discharge
c.
series circuit
b.
magnetic domain
d.
static charge
____ 31. The SI unit for electric current is the _____.
a.
ampere
c.
ohm
b.
electron
d.
volt
____ 32. In the figure shown, the shock that a person gets when touching a metal doorknob after walking across a carpet is caused by _____.
a.
charging by contact
c.
electromagnetic induction
b.
charging by induction
d.
Ohm's Law
____ 33. In the figure shown the spark that jumps between the hand and the doorknob is an example of _____.
a.
a chemical reaction
c.
electromagnetism
b.
an electric discharge
d.
grounding
____ 34. In the figure shown, the spark that occurs results from the movement of _____.
a.
atoms
c.
neutrons
b.
electrons
d.
protons
____ 35. Electrical energy is converted into heat and light in a _____.
a.
battery
c.
magnetic pole
b.
filament
d.
voltmeter
____ 36. Wet-cell batteries are typically used to supply electrical energy to _____.
a.
automobiles
c.
flashlights
b.
calculators
d.
portable CD players
____ 37. One difference between dry-cell batteries and wet-cell batteries is that _____.
a.
Dry-cell batteries are not rechargeable.
b.
No chemical reactions occur in dry-cell batteries.
c.
No chemical reactions occur in wet-cell batteries.
d.
Wet-cell batteries do not have an electrolyte.
____ 38. Which of the following is true about the magnetic field lines of a bar magnet?
a.
They are closest together at the magnet's poles.
b.
They are closest together near the magnet's center.
c.
They are closest together where the magnetic field is weakest.
d.
They extend in a straight line from the magnet's center.
____ 39. Each of the following elements is magnetic except _____.
a.
aluminum
c.
iron
b.
cobalt
d.
nickel
____ 40. The magnetic fields of all the atoms in a magnetic domain _____.
a.
add together
c.
cause a chemical reaction
b.
cancel each other out
d.
produce an electric current
____ 41. In the figure shown, what must happen for current to flow?
a.
A chemical reaction must occur.
c.
The wire loop must be heated.
b.
The magnet's poles must be reversed.
d.
The wire loop must rotate.
____ 42. The generator in the figure shown converts _____.
a.
chemical energy to electrical energy
b.
electrical energy to chemical energy
c.
electrical energy to mechanical energy
d.
mechanical energy to electrical energy
____ 43. Which of the following occurs in a hydroelectric power plant?
a.
Electrical energy is used to move water.
b.
Kinetic energy is converted into electrical energy.
c.
Kinetic energy causes a chemical reaction that produces steam.
d.
Hot water causes a chemical reaction that generates electrical energy.
____ 44. The unit used for measuring electric resistance is the _____.
a.
ampere
c.
ohm
b.
degree
d.
volt
____ 45. A circuit that has more than one closed path for current to follow is referred to as a(n) _____.
a.
electron circuit
c.
parallel circuit
b.
magnetic circuit
d.
series circuit
____ 46. Lightning is an example of _____.
a.
charging by contact
c.
electric discharge
b.
circuit electricity
d.
electromagnetic induction
____ 47. The chemical reactions that occur within a battery cell are caused by chemicals in the _____.
a.
electrolyte
c.
negative electrode
b.
magnetic poles
d.
positive electrode
____ 48. If the current in a portable radio is 0.4 amperes, and the resistance of the circuit is 30.0 ohms, what is the voltage provided by the radio's battery?
a.
0.01 volts
c.
30.4 volts
b.
12 volts
d.
75 volts
____ 49. Which of the following statements about the forces between charged objects is not true?
a.
As the distance between charged objects decreases, the electric force between them decreases.
b.
If one object is positively charged and another is negatively charged, the objects will attract each other.
c.
Two negatively charged objects will repel each other.
d.
Two positively charged objects will repel each other.
____ 50. To make electric charges flow in a circuit, there must be a(n) _____.
a.
electric field
c.
insulator
b.
electrolyte
d.
magnetic domain
____ 51. In the figure shown, how much current flows in circuit 2?
a.
0.15 amperes
c.
40 amperes
b.
6.67 amperes
d.
60 amperes
____ 52. In the figure shown, what is the resistance of circuit 4?
a.
0.025 ohms
c.
12 ohms
b.
6.4 ohms
d.
40 ohms
____ 53. In the figure shown, which circuits have the same resistance?
a.
circuits 1 and 2
c.
circuits 2 and 4
b.
circuits 1 and 3
d.
circuits 3 and 4
____ 54. In the figure shown, diagram B illustrates _____.
a.
a parallel circuit
c.
grounding
b.
a series circuit
d.
resistance
____ 55. In the figure shown, if Lamp 1 burns out, what will happen?
a.
Lamp 2 in both diagrams will go out.
b.
Lamp 2 in diagram A will blink on and off.
c.
Lamp 2 only in diagram A will go out.
d.
Lamp 2 only in diagram B will go out.
____ 56. Homes are wired as shown in which diagram in this figure?
a.
diagram A
c.
either diagram A or B
b.
diagram B
d.
neither diagram A nor B
____ 57. In the figure show, what happens when the amount of current flowing in the wire coil is increased?
a.
The magnetic field becomes stronger.
b.
The magnetic field disappears.
c.
The position of the north and south poles is reversed.
d.
The strength of the magnetic field decreases.
____ 58. In the figure shown, what would happen if the direction of current flow in the wire coil were reversed?
a.
The electromagnet would no longer work.
b.
The north and south poles would switch places.
c.
The strength of the magnetic field would increase.
d.
The strength of the magnetic field would decrease.
____ 59. In the figure shown, how does the bar magnet turn the paper clip into a temporary magnet?
a.
magnetic domains of the paper clip to point in different directions
b.
by causing the magnetic domains of the paper clip to point in one direction
c.
by generating an electric current in the paper clip
d.
by producing a chemical change in the paper clip
____ 60. In the figure shown, what would happen if the bar magnet's south pole were used instead of its north pole?
a.
The magnet would be able to attract the paper clip, but not the screw.
b.
The magnet would be able to attract the screw, but not the paper clip.
c.
The paper clip would no longer be able to attract the screw.
d.
The paper clip would still be able to attract the screw.
____ 61. The energy conversion in an electric generator is
a.
mechanical to electric.
c.
chemical to electric.
b.
electrical to mechanic.
d.
electrical to chemic.
____ 62. A stationary charged particle is surrounded by a(n)
a.
electric field.
c.
electric field and a magnetic field.
b.
magnetic field.
d.
electric current.
____ 63. If the resistance in a circuit is doubled while the voltage remains constant, the current
a.
is doubled.
b.
remains constant.
c.
is halved.
d.
cannot be determined from the information provided.
____ 64. The sparks that occur when you pull a wool sweater over your hair is an example of an electric
a.
field.
c.
current.
b.
discharge.
d.
resistance.
____ 65. Which of the following is an electric conductor?
a.
wood
c.
glass
b.
gold
d.
rubber
____ 66. All of the following apply to an electric current, EXCEPT:
a.
it is surrounded by an magnetic field.
b.
it transfers electric energy.
c.
it is measured in volts.
d.
it is a flow of electrons.
____ 67. An electromagnet is a type of
a.
permanent magnet.
c.
generator.
b.
temporary magnet.
d.
parallel circuit.
____ 68. Ohm's law expresses the relationship of
a.
series and parallel circuits.
b.
voltage, current, and electric discharge.
c.
electric charge and magnetic field.
d.
voltage, current, and resistance.
____ 69. In a parallel circuit, the electrons
a.
all follow the same path.
c.
do not carry an electric current.
b.
can follow more than one path.
d.
have a static charge.
____ 70. A copper wire is an example of a(n)
a.
electric circuit.
c.
insulator.
b.
magnetic material.
d.
conductor.
____ 71. The path in which electrons flow is an electric
a.
current.
c.
insulator.
b.
circuit.
d.
field.
____ 72. A group of iron atoms whose magnetic poles are oriented in the same direction are a(n)
a.
electromagnet.
c.
magnetic domain.
b.
magnetic field.
d.
magnetic pole
Completion
Complete each statement.
73. In the figure shown, air currents have caused the bottom of the storm cloud to become ____________________ charged.
74. In the figure shown, charging by ____________________ has caused the ground to become positively charged.
75. In the figure shown, lightning occurs when the ____________________ between the cloud and the ground causes charges to move.
76. In the figure shown, electric current will flow only if the switch is ____________________.
77. In the figure shown, if the switch is closed and one wire is disconnected, the lightbulb will ____________________.
78. In the figure shown, closing the switch in this circuit causes an ____________________ to travel through the circuit, which makes electrons in the bulb start to flow and the bulb to light.
Unscramble the word in italics to complete these sentences.
79. A material in which electrons do not flow easily is a(n) luntsiora. ____________________
80. A lllepaar circuit is one that provides more than one path for electrons. ____________________
81. A wire in which a current flows wrapped around an iron core produces a(n) cogenateeltrm. ____________________
82. gelotva is a measure of how much electrical energy an electron carries. ____________________
83. A circuit that provides only one path for electrons is a eeriss circuit. ____________________
84. A nuccdotro is a material in which electrons flow easily. ____________________
Choose the italicized word that correctly completes the sentence.
85. The closed path in which electric charges can flow is an electric ____________________ circuit / current.
86. Electrons flow from the ____________________ positive / negative terminal of a battery.
87. Collisions of electrons with other particles in a circuit convert electrical ____________________ energy / charge into heat or light.
88. V = IR is the equation that expresses the relationship known as ____________________ Ohm's / Ampere's law.
89. In the formula V = IR, current is represented by the letter ____________________ I / R.
90. A light switch is part of a ____________________ series / parallel circuit if it controls all of the lights at once.
91. As the distance between two electric charges decreases, the electric force between them ____________________ increases / decreases.
92. The electric force that one electron exerts on another electron is always ____________________ attractive / repulsive.
93. The electric field around an electron points ____________________ toward / away from the electron.
94. The magnetic field around a bar magnetic is ____________________ strongest / weakest at the magnetic poles.
95. Materials such as iron are magnetic materials because they contain magnetic ____________________ currents / domains.
96. The voltage between two points in a circuit ____________________ increases / decreases when the electric field in the circuit increases.
97. In the equation V = IR, the letter “I” represents ____________________, which is measured in units of ____________________.
98. Collisions between moving electrons in a circuit and other particles, such as atoms, result in ____________________.
99. A permanent magnet is formed when all of the ____________________ of a magnetic material line up.
100. A(n) ____________________ converts mechanical energy into electric energy using the relative motion of a magnet and a wire loop.
101. A compass needle points north because the Earth is surrounded by a(n) ____________________.
Matching
Match each term with the correct definition.
a.
insulator
f.
voltage
b.
conductor
g.
magnetic domain
c.
static charge
h.
electromagnetic induction
d.
electric discharge
i.
electric circuit
e.
electric resistance
j.
electric current
____ 102. flow of electric charges
____ 103. imbalance of electric charge on an object
____ 104. group of atoms that have their magnetic poles pointing in the same direction
____ 105. material that allows electric charges to move easily
____ 106. production of electric current through the movement of a magnet and a loop
____ 107. material that does not allow electric charges to move easily
____ 108. measure of how difficult it is for electrons to flow
____ 109. measure of the amount of electrical energy transferred by an electric charge
____ 110. closed path in which electric charges flow
____ 111. movement of static charge from one place to another
Match each item with the correct description below.
a.
charging by contact
f.
electric resistance
b.
charging by polarization
g.
electromagnetic induction
c.
electric discharge
h.
static charge
d.
electric current
i.
magnetic domain
e.
electric circuit
____ 112. an imbalance of electric charge on an object
____ 113. transfer of electric charge between two objects that are touching one another
____ 114. production of an electric current by moving a wire loop and a magnet relative to each other
____ 115. the flow of electrons in a circuit
____ 116. transfer of electric charge between two objects that are not touching one another
____ 117. a group of atoms that have their magnetic poles pointing in one direction
____ 118. a closed path in which electric charges can flow
____ 119. rearrangement of electric charges in an object in an electric field
____ 120. a measure of how difficult it is for electrons to flow in an object
Short Answer
121.
Susan drew this diagram on the chalkboard in class.
What do the arrows in this simple electric circuit represent?
122.
How does the balance of protons and electrons determine whether an atom is electrically charged?
123.
Why is copper commonly used to make electric wires?
124.
How can you use the “30-30 rule” to protect yourself during a thunderstorm?
125.
How does connecting a battery to a circuit make charges flow?
126.
What is the function of a voltmeter?
127.
How does the electrolyte determine whether a battery is a wet-cell or a dry-cell?
128.
In what way are electric fields and magnetic fields similar?
129. What happens to the total charge on a wire when a current flows through the wire?
130. In a series circuit with a constant voltage, what is the effect on current if the number of lightbulbs in the circuit is doubled?
131. How can a broken wire affect a series circuit differently than a parallel circuit?
132. Make a general statement about the relationship between electricity and magnetism. Then, identify two facts that support your statement.
133. How are a battery and an electric generator similar and how are they different?
134. How can you determine whether the bulbs in a string of holiday lights are part of a series circuit or part of a parallel circuit?
135. Use the information in the table to match the descriptions to the materials.
Electrical Conductor
Attracted to a Magnet
Material A
yes
yes
Material B
yes
no
Material C
no
no
a. iron nail
b. copper wire
c. glass rod
Study the diagram and use it to answer the questions.
136. What is this a diagram of?
137. What is the source of energy in the diagram?
138. What would be the effect on lightbulb A if the switch were closed?
139. What would be the effect on lightbulb B if the switch were opened?
Essay
140.
What is electric resistance? How is it responsible for creating the light in a lightbulb? Be sure to explain what transformations of energy take place as electrons move through a circuit.
141. Describe how your day at school would be different if there were no electric power.
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____ 1. The positive electrode in a dry-cell battery is a zinc rod. _________________________
____ 2. In a battery, chemical energy is transformed into electrical energy. _________________________
____ 3. Charging by contact occurs when an electric field rearranges the charges in an object. _________________________
____ 4. Unlike magnetic poles repel each other. _________________________
____ 5. The amount of positive charge on a proton equals the amount of negative charge on a neutron. _________________________
____ 6. As the amount of charge on either of two charged objects increases, the electric force between the objects decreases. _________________________
____ 7. An electromagnet is a current-carrying wire wrapped around a copper core. _________________________
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 8. Which of these particles can be found in the nucleus of an atom?
a.
electrons
b.
electrons and protons
c.
electrons, protons, and neutrons
d.
neutrons and protons
____ 9. Why do we say that atoms are neutral?
a.
They contain neutrons.
b.
They make up all matter.
c.
They have zero total charge.
d.
They remain motionless.
____ 10. Which of the following does NOT affect the electric force between objects?
a.
the amount of charge on the objects
b.
the distance between the objects
c.
the size of the objects
d.
whether the objects have like or unlike charges
____ 11. Why are electrically charged objects able to exert force on one another without touching?
a.
They are affected by gravity.
b.
They are surrounded by a magnetic field.
c.
They are surrounded by an electric field.
d.
They create a current.
____ 12. What happens to an object when it picks up excess electrons by contact?
a.
It becomes an insulator.
b.
It becomes negatively charged.
c.
It becomes positively charged.
d.
It gives off a bright spark.
____ 13. Which word describes material in which electric charges move easily?
a.
conductor
b.
field
c.
insulator
d.
magnet
____ 14. Why does a wire remain electrically neutral?
a.
because electrons flow in and out at the same rate
b.
because it has more protons than electrons
c.
because it is coated in neutrons
d.
because it stays charged by flowing electrons
____ 15. Cary and Alana are making an electromagnet for a class project. To make the electromagnet, they wrap a current-carrying wire around an iron core. What is the relationship between electricity and magnetism that makes it possible for them to create an electromagnet?
a.
A moving electric charge is surrounded by a magnetic field.
b.
Magnets are electrically charged objects.
c.
The wire conductor is made of magnetic material.
d.
All circuits are temporary magnets.
____ 16. Ricardo is studying different changes in electric circuits. What happens when he increases the voltage in a circuit?
a.
The circuit breaks.
b.
The current increases.
c.
The flow of electrons slows down.
d.
The resistance increases.
____ 17. Which device converts mechanical energy into electrical energy by rotating a wire loop inside a magnetic field?
a.
a battery
b.
a series circuit
c.
an electric generator
d.
an electromagnet
____ 18. Rita is writing a report that compares magnets and electric charges. Which of these is NOT a characteristic shared by magnets and electric charges?
a.
Their forces are stronger as they move closer together.
b.
Their like charges repel and unlike charges attract.
c.
They are surrounded by fields that exert force at a distance.
d.
They have charges arranged in domains.
____ 19. Kendra and Jamal are looking at this diagram in a science book. The diagram shows the magnetic domains of the same object before and after it is acted on by the force of a permanent magnet.
What type of object does this diagram show?
a.
a bar magnet
b.
a compass
c.
an electromagnet
d.
a temporary magnet
____ 20. Which of the following transforms mechanical energy to electric energy?
a.
a lightning rod
b.
an electromagnet
c.
an electric generator
d.
a parallel circuit
____ 21. A material through which electrons can move easily is a _____.
a.
conductor
c.
insulator
b.
electromagnet
d.
nucleus
____ 22. Each of the following is an example of an insulator except _____.
a.
copper
c.
rubber
b.
glass
d.
wood
____ 23. An atom has equal numbers of protons and _____.
a.
electrons
c.
ohms
b.
neutrons
d.
volts
____ 24. The process of providing a path to drain excess charge into Earth is called _____.
a.
electromagnetic induction
c.
lightning
b.
grounding
d.
resistance
____ 25. Which of the following correctly states Ohm's Law?
a.
resistance = voltage + current
c.
voltage = current / resistance
b.
resistance = voltage x current
d.
voltage = current x resistance
____ 26. An object with equal amounts of positive and negative charge is electrically _____.
a.
charged
c.
neutral
b.
negative
d.
positive
____ 27. If the distance between two charged objects increases, the electric force between them _____.
a.
decreases
c.
remains the same
b.
increases
d.
stops
____ 28. Every proton and electron is surrounded by a(n) _____.
a.
electric circuit
c.
insulator
b.
electric field
d.
magnetic pole
____ 29. Which of the following is an example of charging by induction?
a.
clothes sticking together after tumbling in a dryer
b.
making a paper clip into a temporary magnet
c.
rubbing a balloon against a person's hair
d.
sticking a balloon to a wall after rubbing it on a sweater
____ 30. When an object has more negative charge than positive charge, the result is called a _____.
a.
electric discharge
c.
series circuit
b.
magnetic domain
d.
static charge
____ 31. The SI unit for electric current is the _____.
a.
ampere
c.
ohm
b.
electron
d.
volt
____ 32. In the figure shown, the shock that a person gets when touching a metal doorknob after walking across a carpet is caused by _____.
a.
charging by contact
c.
electromagnetic induction
b.
charging by induction
d.
Ohm's Law
____ 33. In the figure shown the spark that jumps between the hand and the doorknob is an example of _____.
a.
a chemical reaction
c.
electromagnetism
b.
an electric discharge
d.
grounding
____ 34. In the figure shown, the spark that occurs results from the movement of _____.
a.
atoms
c.
neutrons
b.
electrons
d.
protons
____ 35. Electrical energy is converted into heat and light in a _____.
a.
battery
c.
magnetic pole
b.
filament
d.
voltmeter
____ 36. Wet-cell batteries are typically used to supply electrical energy to _____.
a.
automobiles
c.
flashlights
b.
calculators
d.
portable CD players
____ 37. One difference between dry-cell batteries and wet-cell batteries is that _____.
a.
Dry-cell batteries are not rechargeable.
b.
No chemical reactions occur in dry-cell batteries.
c.
No chemical reactions occur in wet-cell batteries.
d.
Wet-cell batteries do not have an electrolyte.
____ 38. Which of the following is true about the magnetic field lines of a bar magnet?
a.
They are closest together at the magnet's poles.
b.
They are closest together near the magnet's center.
c.
They are closest together where the magnetic field is weakest.
d.
They extend in a straight line from the magnet's center.
____ 39. Each of the following elements is magnetic except _____.
a.
aluminum
c.
iron
b.
cobalt
d.
nickel
____ 40. The magnetic fields of all the atoms in a magnetic domain _____.
a.
add together
c.
cause a chemical reaction
b.
cancel each other out
d.
produce an electric current
____ 41. In the figure shown, what must happen for current to flow?
a.
A chemical reaction must occur.
c.
The wire loop must be heated.
b.
The magnet's poles must be reversed.
d.
The wire loop must rotate.
____ 42. The generator in the figure shown converts _____.
a.
chemical energy to electrical energy
b.
electrical energy to chemical energy
c.
electrical energy to mechanical energy
d.
mechanical energy to electrical energy
____ 43. Which of the following occurs in a hydroelectric power plant?
a.
Electrical energy is used to move water.
b.
Kinetic energy is converted into electrical energy.
c.
Kinetic energy causes a chemical reaction that produces steam.
d.
Hot water causes a chemical reaction that generates electrical energy.
____ 44. The unit used for measuring electric resistance is the _____.
a.
ampere
c.
ohm
b.
degree
d.
volt
____ 45. A circuit that has more than one closed path for current to follow is referred to as a(n) _____.
a.
electron circuit
c.
parallel circuit
b.
magnetic circuit
d.
series circuit
____ 46. Lightning is an example of _____.
a.
charging by contact
c.
electric discharge
b.
circuit electricity
d.
electromagnetic induction
____ 47. The chemical reactions that occur within a battery cell are caused by chemicals in the _____.
a.
electrolyte
c.
negative electrode
b.
magnetic poles
d.
positive electrode
____ 48. If the current in a portable radio is 0.4 amperes, and the resistance of the circuit is 30.0 ohms, what is the voltage provided by the radio's battery?
a.
0.01 volts
c.
30.4 volts
b.
12 volts
d.
75 volts
____ 49. Which of the following statements about the forces between charged objects is not true?
a.
As the distance between charged objects decreases, the electric force between them decreases.
b.
If one object is positively charged and another is negatively charged, the objects will attract each other.
c.
Two negatively charged objects will repel each other.
d.
Two positively charged objects will repel each other.
____ 50. To make electric charges flow in a circuit, there must be a(n) _____.
a.
electric field
c.
insulator
b.
electrolyte
d.
magnetic domain
____ 51. In the figure shown, how much current flows in circuit 2?
a.
0.15 amperes
c.
40 amperes
b.
6.67 amperes
d.
60 amperes
____ 52. In the figure shown, what is the resistance of circuit 4?
a.
0.025 ohms
c.
12 ohms
b.
6.4 ohms
d.
40 ohms
____ 53. In the figure shown, which circuits have the same resistance?
a.
circuits 1 and 2
c.
circuits 2 and 4
b.
circuits 1 and 3
d.
circuits 3 and 4
____ 54. In the figure shown, diagram B illustrates _____.
a.
a parallel circuit
c.
grounding
b.
a series circuit
d.
resistance
____ 55. In the figure shown, if Lamp 1 burns out, what will happen?
a.
Lamp 2 in both diagrams will go out.
b.
Lamp 2 in diagram A will blink on and off.
c.
Lamp 2 only in diagram A will go out.
d.
Lamp 2 only in diagram B will go out.
____ 56. Homes are wired as shown in which diagram in this figure?
a.
diagram A
c.
either diagram A or B
b.
diagram B
d.
neither diagram A nor B
____ 57. In the figure show, what happens when the amount of current flowing in the wire coil is increased?
a.
The magnetic field becomes stronger.
b.
The magnetic field disappears.
c.
The position of the north and south poles is reversed.
d.
The strength of the magnetic field decreases.
____ 58. In the figure shown, what would happen if the direction of current flow in the wire coil were reversed?
a.
The electromagnet would no longer work.
b.
The north and south poles would switch places.
c.
The strength of the magnetic field would increase.
d.
The strength of the magnetic field would decrease.
____ 59. In the figure shown, how does the bar magnet turn the paper clip into a temporary magnet?
a.
magnetic domains of the paper clip to point in different directions
b.
by causing the magnetic domains of the paper clip to point in one direction
c.
by generating an electric current in the paper clip
d.
by producing a chemical change in the paper clip
____ 60. In the figure shown, what would happen if the bar magnet's south pole were used instead of its north pole?
a.
The magnet would be able to attract the paper clip, but not the screw.
b.
The magnet would be able to attract the screw, but not the paper clip.
c.
The paper clip would no longer be able to attract the screw.
d.
The paper clip would still be able to attract the screw.
____ 61. The energy conversion in an electric generator is
a.
mechanical to electric.
c.
chemical to electric.
b.
electrical to mechanic.
d.
electrical to chemic.
____ 62. A stationary charged particle is surrounded by a(n)
a.
electric field.
c.
electric field and a magnetic field.
b.
magnetic field.
d.
electric current.
____ 63. If the resistance in a circuit is doubled while the voltage remains constant, the current
a.
is doubled.
b.
remains constant.
c.
is halved.
d.
cannot be determined from the information provided.
____ 64. The sparks that occur when you pull a wool sweater over your hair is an example of an electric
a.
field.
c.
current.
b.
discharge.
d.
resistance.
____ 65. Which of the following is an electric conductor?
a.
wood
c.
glass
b.
gold
d.
rubber
____ 66. All of the following apply to an electric current, EXCEPT:
a.
it is surrounded by an magnetic field.
b.
it transfers electric energy.
c.
it is measured in volts.
d.
it is a flow of electrons.
____ 67. An electromagnet is a type of
a.
permanent magnet.
c.
generator.
b.
temporary magnet.
d.
parallel circuit.
____ 68. Ohm's law expresses the relationship of
a.
series and parallel circuits.
b.
voltage, current, and electric discharge.
c.
electric charge and magnetic field.
d.
voltage, current, and resistance.
____ 69. In a parallel circuit, the electrons
a.
all follow the same path.
c.
do not carry an electric current.
b.
can follow more than one path.
d.
have a static charge.
____ 70. A copper wire is an example of a(n)
a.
electric circuit.
c.
insulator.
b.
magnetic material.
d.
conductor.
____ 71. The path in which electrons flow is an electric
a.
current.
c.
insulator.
b.
circuit.
d.
field.
____ 72. A group of iron atoms whose magnetic poles are oriented in the same direction are a(n)
a.
electromagnet.
c.
magnetic domain.
b.
magnetic field.
d.
magnetic pole
Completion
Complete each statement.
73. In the figure shown, air currents have caused the bottom of the storm cloud to become ____________________ charged.
74. In the figure shown, charging by ____________________ has caused the ground to become positively charged.
75. In the figure shown, lightning occurs when the ____________________ between the cloud and the ground causes charges to move.
76. In the figure shown, electric current will flow only if the switch is ____________________.
77. In the figure shown, if the switch is closed and one wire is disconnected, the lightbulb will ____________________.
78. In the figure shown, closing the switch in this circuit causes an ____________________ to travel through the circuit, which makes electrons in the bulb start to flow and the bulb to light.
Unscramble the word in italics to complete these sentences.
79. A material in which electrons do not flow easily is a(n) luntsiora. ____________________
80. A lllepaar circuit is one that provides more than one path for electrons. ____________________
81. A wire in which a current flows wrapped around an iron core produces a(n) cogenateeltrm. ____________________
82. gelotva is a measure of how much electrical energy an electron carries. ____________________
83. A circuit that provides only one path for electrons is a eeriss circuit. ____________________
84. A nuccdotro is a material in which electrons flow easily. ____________________
Choose the italicized word that correctly completes the sentence.
85. The closed path in which electric charges can flow is an electric ____________________ circuit / current.
86. Electrons flow from the ____________________ positive / negative terminal of a battery.
87. Collisions of electrons with other particles in a circuit convert electrical ____________________ energy / charge into heat or light.
88. V = IR is the equation that expresses the relationship known as ____________________ Ohm's / Ampere's law.
89. In the formula V = IR, current is represented by the letter ____________________ I / R.
90. A light switch is part of a ____________________ series / parallel circuit if it controls all of the lights at once.
91. As the distance between two electric charges decreases, the electric force between them ____________________ increases / decreases.
92. The electric force that one electron exerts on another electron is always ____________________ attractive / repulsive.
93. The electric field around an electron points ____________________ toward / away from the electron.
94. The magnetic field around a bar magnetic is ____________________ strongest / weakest at the magnetic poles.
95. Materials such as iron are magnetic materials because they contain magnetic ____________________ currents / domains.
96. The voltage between two points in a circuit ____________________ increases / decreases when the electric field in the circuit increases.
97. In the equation V = IR, the letter “I” represents ____________________, which is measured in units of ____________________.
98. Collisions between moving electrons in a circuit and other particles, such as atoms, result in ____________________.
99. A permanent magnet is formed when all of the ____________________ of a magnetic material line up.
100. A(n) ____________________ converts mechanical energy into electric energy using the relative motion of a magnet and a wire loop.
101. A compass needle points north because the Earth is surrounded by a(n) ____________________.
Matching
Match each term with the correct definition.
a.
insulator
f.
voltage
b.
conductor
g.
magnetic domain
c.
static charge
h.
electromagnetic induction
d.
electric discharge
i.
electric circuit
e.
electric resistance
j.
electric current
____ 102. flow of electric charges
____ 103. imbalance of electric charge on an object
____ 104. group of atoms that have their magnetic poles pointing in the same direction
____ 105. material that allows electric charges to move easily
____ 106. production of electric current through the movement of a magnet and a loop
____ 107. material that does not allow electric charges to move easily
____ 108. measure of how difficult it is for electrons to flow
____ 109. measure of the amount of electrical energy transferred by an electric charge
____ 110. closed path in which electric charges flow
____ 111. movement of static charge from one place to another
Match each item with the correct description below.
a.
charging by contact
f.
electric resistance
b.
charging by polarization
g.
electromagnetic induction
c.
electric discharge
h.
static charge
d.
electric current
i.
magnetic domain
e.
electric circuit
____ 112. an imbalance of electric charge on an object
____ 113. transfer of electric charge between two objects that are touching one another
____ 114. production of an electric current by moving a wire loop and a magnet relative to each other
____ 115. the flow of electrons in a circuit
____ 116. transfer of electric charge between two objects that are not touching one another
____ 117. a group of atoms that have their magnetic poles pointing in one direction
____ 118. a closed path in which electric charges can flow
____ 119. rearrangement of electric charges in an object in an electric field
____ 120. a measure of how difficult it is for electrons to flow in an object
Short Answer
121.
Susan drew this diagram on the chalkboard in class.
What do the arrows in this simple electric circuit represent?
122.
How does the balance of protons and electrons determine whether an atom is electrically charged?
123.
Why is copper commonly used to make electric wires?
124.
How can you use the “30-30 rule” to protect yourself during a thunderstorm?
125.
How does connecting a battery to a circuit make charges flow?
126.
What is the function of a voltmeter?
127.
How does the electrolyte determine whether a battery is a wet-cell or a dry-cell?
128.
In what way are electric fields and magnetic fields similar?
129. What happens to the total charge on a wire when a current flows through the wire?
130. In a series circuit with a constant voltage, what is the effect on current if the number of lightbulbs in the circuit is doubled?
131. How can a broken wire affect a series circuit differently than a parallel circuit?
132. Make a general statement about the relationship between electricity and magnetism. Then, identify two facts that support your statement.
133. How are a battery and an electric generator similar and how are they different?
134. How can you determine whether the bulbs in a string of holiday lights are part of a series circuit or part of a parallel circuit?
135. Use the information in the table to match the descriptions to the materials.
Electrical Conductor
Attracted to a Magnet
Material A
yes
yes
Material B
yes
no
Material C
no
no
a. iron nail
b. copper wire
c. glass rod
Study the diagram and use it to answer the questions.
136. What is this a diagram of?
137. What is the source of energy in the diagram?
138. What would be the effect on lightbulb A if the switch were closed?
139. What would be the effect on lightbulb B if the switch were opened?
Essay
140.
What is electric resistance? How is it responsible for creating the light in a lightbulb? Be sure to explain what transformations of energy take place as electrons move through a circuit.
141. Describe how your day at school would be different if there were no electric power.
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