Physical Science Exam Review

GOAL 3: Construct an understanding of electricity and magnetism.

Vocabulary: static electricity, electrons, protons, electrical charge, resistance,

current, circuit, potential difference, ohm, volt, ampere,

electromagnet, series circuit, parallel circuit, coulomb,

Ohm’s law

3.01—Analyze the nature of static electricity and the conservation of electrical charge:

positive and negative charges

opposite charges attract; like charges repel

Glencoe Physical Science: Chapter 7
_____ 63. Object #1 is charged positively and object #2 is repelled when brought close to object #1. We

can infer that object #2 is

1. 
   negatively charged
   
2. 
   positively charged
   
3. 
   neutral
   

_____ 64. When a neutral object gains electrons,

1. 
   its overall charge is negative
   
2. 
   it loses the same number of electrons simultaneously
   
3. 
   it stays neutral
   
4. 
   its overall charge is positive
   

_____ 65. A build up of charge on an object is known as

1. 
   static electricity
   
2. 
   direct current
   
3. 
   alternating current
   
4. 
   electromagnetic induction
   

_____ 66. Static charge builds up because an object has lost or gained ____.

A) electrons B) protons C) neutrons
_____ 67. The negatively charged particles that make up an atom are the:

A) electrons B) protons C) neutrons

_____ 68. The positively charged subatomic particles are the:

A) electrons B) protons C) neutrons

_____ 69. A force of attraction exists between:

1. 
   two protons B) two electrons C) an electron and a proton
   

D) a neutron and an electron
3.02—Analyze the electrical charging of objects due to the transfer of

electrons by friction, induction or conduction

Glencoe Physical Science: Chapter 7
_____ 70. A good electrical conductor is:

A) glass B) rubber C) wood D) silver

_____ 71. A material that does NOT let electrical charges pass freely through it is:

A) a conductor B) a compass C) an insulator D) copper

_____ 72. When a glass rod loses electrons as the result of being rubbed with silk:

1. 
   both the rod and silk remain neutral
   
2. 
   the charge on the silk is positive
   
3. 
   the rod becomes charged, but the silk remains neutral
   
4. 
   the charge on the glass rod is positive
   

_____ 73. An instrument that can detect an electric charge is:

A) an electroscope B) a voltmeter C) an ammeter
_____ 74. When you rub a balloon across a sweater, the balloon becomes negatively

charged because it:

1. 
   gains electrons
   
2. 
   gains protons
   
3. 
   loses electrons
   

_____ 75. When you rub a balloon across a sweater, the sweater becomes positively

charged because it:

1. 
   gains electrons
   
2. 
   gains protons
   
3. 
   loses electrons
   

76. 
    Draw a diagram of an electroscope that is charged 
    

76. 
    Draw a diagram of an electroscope that is uncharged
    

3.03—Analyze direct current electrical circuits:

• 
  Electrical potential difference
  
• 
  Resistance
  
• 
  Ohm’s law
  
• 
  Simple direct current circuits
  
• 
  Series circuit
  
• 
  Parallel circuit
  

_____ 78. The difference in electrical potential energy between two places is called:

A) a circuit B) potential difference C) current

_____ 79. The path along which electrons may flow is called:

A) a circuit B) a current C) a volt

_____ 80. The number of electrons (or charges) that move past a given point in a given time is a measure

Of:

A) current B) voltage C) resistance

_____ 81. What is the resistance of a lamp operating at 115 volts and using 0.25 amperes

of current?

A) 2.17 x 10 ^–3  B) 28.75  C) 460 

_____ 82. Electric current in which electrons flow in only one direction is called:

1. 
   direct current
   
2. 
   electromagnetic induction
   
3. 
   alternating current
   
4. 
   a parallel circuit
   

_____ 83. Draw a diagram showing a parallel circuit:

_____ 84. How much current is used when a 12 ohm heater is connected to a 120 volt source?

A) 0.1 A B) 10 A C) 1440 A

_____ 85. How much power does a heater have if it uses 5 amperes at 120 volts?

A) 24 watts B) 0.042 watts C) 600 watts

_____ 86. The opposition to the flow of electrons in a conductor is called:

A) voltage B) resistance C) current D) power

_____ 87. A string of lights is wired so that if one of the light bulbs burns out, the others go out too. What

kind of circuit is this?

A) parallel B) electromagnetic C) series D) short
_____ 88. The current passing through the taillight of a car is 4A. The resistance is 2 . What is the

potential difference across the light?

A) 0.5 V B) 2 V C) 8 V
_____ 89. A string of lights is wired so that if one of the light bulbs burns out, the others stay lit. What

kind of circuit is this?

A) parallel B) electromagnetic C) series D) short
3.04—Analyze the practical applications of magnetism and its relationship to

the movement of electrical charge.

Glencoe Physical Science: Chapter 7
_____ 90. Elements which may be easily magnetized are

1. 
   copper, iron and aluminum
   
2. 
   copper, iron and steel
   
3. 
   iron, nickel and copper
   
4. 
   iron, nickel and cobalt
   

_____ 91. The process whereby current is produced by the motion of a coil of wire in a

magnetic field is called:

A) voltage difference B) electromagnetic induction C) static discharge

_____ 92. A device that increases or decreases the voltage of electric current is:

1. 
   a transformer
   
2. 
   a computer
   
3. 
   an electromagnet
   
4. 
   a generator
   

_____ 93. A device that converts electrical energy to mechanical energy is:

1. 
   a transformer
   
2. 
   a generator
   
3. 
   an electric motor
   
4. 
   a galvanometer
   

_____ 94. The magnetic field around a magnet is strongest at the:

1. 
   top of the magnet
   
2. 
   poles of the magnet
   
3. 
   middle of the magnet
   

_____ 95. To increase the strength of an electromagnet, you can:

1. 
   increase the number of coils of wire around the core
   
2. 
   increase the current in the wire
   
3. 
   decrease the number of coils of wire around the core
   
4. 
   both A and B
   
5. 
   both B and C
   

_____ 96. The area around a magnet where the magnetic force acts is called:

1. 
   a magnetic field
   
2. 
   a polar bar
   
3. 
   a magneto
   
4. 
   the attraction-repulsion vector
   

_____ 97. Pushing a magnet through a coil of wire causes a ___ in the wire.

A) short circuit B) charge C) current D) break
3.05—Analyze permanent magnetism and the practical applications of the

characteristics of permanent magnets.

Glencoe Physical Science: Chapter 8
_____ 98. As two magnets are brought closer together, the force between them

A) increases B) decreases

_____ 99. The magnetic field around a magnet is strongest at the

1. 
   top of the magnet
   
2. 
   poles of the magnet
   
3. 
   middle of the magnet
   

_____ 100. Magnetism is

1. 
   an attraction between two masses
   
2. 
   a force acting at right angles to its mass
   
3. 
   a force of attraction or repulsion between two objects
   
4. 
   all of the above
   

_____ 101. Elements which may be easily magnetized are

1. 
   copper, iron and aluminum
   
2. 
   copper, iron and steel
   
3. 
   iron, nickel and copper
   
4. 
   iron, nickel and cobalt
   

_____ 102. The north pole of one magnet is brought near the north pole of another

magnet. The magnets will

A) attract B) repel