Multiple Choice Identify the choice that best completes the statement or
answers the question.
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1
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Potential difference acts like an “electric pressure” that produces
______________.
a. | resistance | c. | an electrical current | b. | voltage | d. | electrical pressure |
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2
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A transistor circuit is used as an amplifier. When a
signal is applied to the input of the transistor, the output signal is
a. | zero amplitude.
| c. | a
smaller amplitude. | b. | an equal
amplitude.
| d. | a larger amplitude.
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3
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(2 Points)
What would the voltmeter read in the circuit diagram
below?
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4
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In circuits of metal wires, _____________ are the flowing charged
particles.
a. | electrons | c. | protons | b. | neutrons | d. | protons or
electrons |
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5
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(2
Points) A 6 V battery delivers a 0.5 A current to
an electric motor that is conncected across its terminals. What is the power consumed by the
motor?
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6
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A metal bar magnet has a magnetic field in theregion
of space around it. The magnetic field is due to
a. | a hidden voltage source in the
metal.
| c. | magnetic monopoles embedded in the
metal | b. | the motion of charged particles in the
metal. | d. | an electric current that runs along the length of the
magnet. |
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7
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Any path along which electrons can flow is called a __________.
a. | potentiometer | c. | wire | b. | electrical pathway | d. | electrical
circuit |
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8
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When a 4-V battery is connected to a resistor, 2 A of current
flows in the resistor. What is the resistor's value?
a. | 3 ohms | b. | 8 ohms | c. | 4
ohms | d. | 2 ohms | e. | more than 8
ohms |
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9
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(2 Points)
What is the current flowing in the circuit below?
a. | 1.0 A | b. | 12 A | c. | 6.0
A | d. | 36 A |
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10
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A charged object has electric potential energy by virtue of its
___________ in an electric field
a. | charge | c. | direction | b. | location | d. | none of the
above |
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11
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(2 Points)
What is the current through the battery?
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12
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(2 Points)
What is the voltage across each of the 4 ohm resistors?
a. | 36 V | b. | 0.17 V | c. | 6
V | d. | 12 V |
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13
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Electrical current is measured in _____________.
a. | coulomb's / second | c. | amperes | b. | watts | d. | both
a and c |
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14
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A difference between electrical forces and gravitational forces is that
electrical forces include
a. | separation distance. | b. | the inverse square law. | c. | repulsive
interactions. | d. | infinite range. | e. | none of the
above |
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15
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A ________________ is a device is used in electrical circuits to store
charge
a. | resistor | c. | insulator | b. | transistor | d. | capacitor |
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16
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The units for electrical potential are ____________.
a. | volts | c. | joules/coulomb | b. | amperes | d. | both a and c |
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17
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A coil with a current is shown above. In the center
of the coil, a magnetic field points
a. | downward. | c. | to the
right. | b. | upward. | d. | to the
left. |
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18
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The SI unit of "charge" is the ______________.
a. | coulomb | c. | joule | b. | watt | d. | ampere |
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19
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Materials through which charges do not move easily. (e.g.
glass, dry wood, most plastics, cloth, and dry air) are called _____________.
a. | circuits | c. | insulators | b. | conductors | d. | ionic compounds |
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20
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(2 Points)
What is the current flowing in the battery below?
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21
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The electric field extends radially away from the
__________.
a. | protons | c. | ions | b. | neutrons | d. | electrons |
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22
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The nucleus of an atom is composed of__________________.
a. | protons | c. | neutrons | b. | electrons | d. | both protons and
neutrons |
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23
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(2 Points)
When plugged into a 120-V wall outlet, how much current is used by a
lightbulb rated at 100 W?
a. | 12,000 A | b. | 100 A | c. | 120
A | d. | 0.8 A | e. | none of the
above |
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24
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(2 Points)
What is the total resistance in the circuit below?
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25
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Protons and electrons
a. | do not interact. | b. | repel each other. | c. | attract each
other. |
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26
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The rate at which energy is
transferred is called ____________.
a. | energy | c. | power | b. | work | d. | current |
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27
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(2
Points) In this circuit, what is the current through the 2.0-ohm
resistor?
a. | 0.2 A | c. | 5.0 A | b. | 2.0 A | d. | 20 A |
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28
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(2 Points)
Two charges, qA, and qB, are
separated by a distance, d, and exert a force, F, on each other.
Analyze Coulomb’s law and identify what new force will exist if qA is
tripled ?
a. | force will be cut in by a third | c. | force will be increased by factor
of ½ | b. | force will be tripled | d. | no effect on force |
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29
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What affect would tripling the voltage in a circuit have on the
current.
a. | increase it by a factor of 6 | c. | decrease it by a
third | b. | no effect | d. | triple it |
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30
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Touching a charged body to earth to eliminate excess charge is called
__________.
a. | static equilibrium | c. | grounding | b. | l | d. | charging |
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31
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(2 Points)
A car battery causes a current of 1.0 A through a lamp while
48 V is across it. What is the power used by the lamp?
a. | 0.80 watts | c. | 12.0 watts | b. | 48 watts | d. | 24 watts |
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32
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(2 Points)
What is the voltage across the 10 ohm resistor?
a. | 0.4 V | b. | 10 V | c. | 2.4
V | d. | 24 V |
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33
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Normally atoms have a ______ net charge
a. | negative | c. | positive | b. | zero | d. | either positive or
negative |
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34
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A 100-watt light bulb is connected to a 120-V outlet. How much
current is in the light bulb?
a. | 0.42 A | b. | 1.67 A | c. | 6
A | d. | 0.83 A | e. | more than 6 A |
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35
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Which of the following statements is not true concerning electrical
force?
a. | like charges repel | c. | unlike charges attract | b. | Force is directly
proportional to distance | d. | electrical force is a vector quantity |
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36
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An electric field has
a. | direction. | b. | magnitude. | c. | Both A and
B |
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37
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(2 Points)The current through a 5-ohm resistor connected to
a 130-V power supply is
a. | 26 A. | b. | 10 A. | c. | 130
A. | d. | 1A. | e. | none of the
above |
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38
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A charged atom is called a ____________.
a. | compound | c. | isotope | b. | radioactive | d. | ion |
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39
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The second right-hand-rule is use to determine ____________________.
a. | the direction of force | c. | the direction of the magnetic field | b. | the direction of
current flow | d. | the polarity
of an electromagnet |
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40
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Which of the following will effect the resistance of a wire?
a. | the length of the wire | c. | the diameter of the wire | b. | temperature | d. | all of the above |
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41
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(2 Points)
The current flowing through 3 identical 2 ohm resistors is 5
amperes. What is the potential difference?
a. | 60 V | b. | 10 V | c. | 2.5
V | d. | 30 V |
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42
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(2 Points)
What is the voltage across each of the lightbulbs in the circuit
diagram below?
a. | 24 V | c. | 16 V | b. | 8
V | d. | 12 V |
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43
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(2 Points)
A motor with an operating resistance of 5 W is connected to a voltage source. The current in the circuit
is 2.0 A. What is the voltage of the source?
a. | 2.5 volts | c. | 10.0 volts | b. | 0.20 volts | d. | 1.0 volts |
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44
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Every atom composed of (+) positively charged nucleus surrounded by (-)
negatively charged ______________.
a. | electrons | c. | ions | b. | protons | d. | neutrons |
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45
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Materials that allow charges to move about easily (e.g. metals, plasma (ionized
gas), graphite) are called _____________.
a. | ionic compounds | c. | conductors | b. | insulators | d. | circuits |
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