Physics Test 17B
 
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Physics Test 17B

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

 1. 
When a glass rod is rubbed with silk and becomes positively charged,
a.
electrons are removed from the rod.
b.
protons are added to the silk.
c.
protons are removed from the silk.
d.
the silk remains neutral.
 

 2. 
The electric field lines around a negatively charged particle
a.
cross positively charged particle field lines.
b.
cross negatively charged particle field lines.
c.
always point inward.
d.
always point outward.
 

 3. 
Electric field lines
a.
point toward a negative charge.
c.
never cross one another.
b.
point away from a positive charge.
d.
All of the above
 

 4. 
Electric field lines indicate
a.
direction only.
c.
both direction and relative strength.
b.
relative strength only.
d.
neither direction nor strength.
 

 5. 
Potential differences cause
a.
electrons to move from the positive terminal to the negative terminal.
b.
electrons to move from the negative terminal to the positive terminal.
c.
protons to move from the positive terminal to the negative terminal.
d.
protons to move from the negative terminal to the positive terminal.
 

 6. 
The brightness of a light bulb is determined by its filament’s
a.
voltage.
c.
watts.
b.
amperes.
d.
resistance.
 

 7. 
Whether or not charges will move in a material depends partly on how tightly _____ are held in the atoms of the material.
a.
electrons
c.
protons
b.
neutrons
d.
resistors
 

 8. 
The resistance of an insulator is
a.
absent.
c.
moderate.
b.
very low.
d.
high.
 

 9. 
Which of the following shows how conductors, insulators, superconductors, and semiconductors rank in order of least resistance to most resistance?
a.
superconductors, conductors, semiconductors, insulators
b.
semiconductors, superconductors, conductors, insulators
c.
insulators, conductors, semiconductors, superconductors
d.
none of the above
 

 10. 
Appliances connected so that they form a single pathway for charges to flow are connected in a(n)
a.
series circuit.
c.
open circuit.
b.
parallel circuit.
d.
closed circuit.
 

 11. 
Positive charges _____ one another.
a.
attract
c.
repel
b.
cancel
d.
join
 

 12. 
The electric force between two objects _____ when the distance between them decreases.
a.
increases
c.
remains constant
b.
decreases
d.
None of the above
 

 13. 
Which of the following is a negatively charged particle?
a.
proton
c.
coulomb
b.
electron
d.
neutron
 

 14. 
Electric field lines show the strength and _____ of an electric field.
a.
polarization
c.
temperature
b.
direction
d.
friction
 

 15. 
An electric cell is a source of electric current because of a _____ between the terminals.
a.
resistance
c.
semiconductor
b.
light bulb
d.
potential difference
 

 16. 
A(n) _____ is a solution that conducts electricity.
a.
electrode
c.
terminal
b.
voltage
d.
electrolyte
 

 17. 
The rate at which charges move through a conductor is called
a.
voltage.
c.
current.
b.
resistance.
d.
electrical potential energy.
 

 18. 
Conventional current is defined as the movement of
a.
positive charge.
c.
negative charge.
b.
variable charge.
d.
net charge.
 

 19. 
_____ is the opposition posed by a material to the flow of current.
a.
Voltage
c.
Resistance
b.
Charge
d.
Ampere
 

 20. 
Current is produced when charges are accelerated by an electric field to move to a position of lower
a.
temperature.
c.
concentration.
b.
potential energy.
d.
kinetic energy.
 

 21. 
Calculate the resistance of a bulb that draws 0.6 A of current with a potential difference of 3 V.
a.
0.2 W
c.
5 W
b.
1.8 W
d.
15 W
 

 22. 
Which of the following has the lowest resistance?
a.
semiconductor
c.
conductor
b.
superconductor
d.
insulator
 

 23. 
A 6.0-V battery is connected to a 24-W resistor. What is the current in the resistor?
a.
0.25 A
c.
18 A
b.
4.0 A
d.
144 A
 

 24. 
In most cases, increasing the temperature of an object will _____ its resistance.
a.
increase
c.
have no effect on
b.
decrease
d.
nullify
 

 25. 
Individual components in a parallel circuit experience the same
a.
voltage.
c.
power.
b.
current.
d.
dissipation.
 

 26. 
A device connected to a 120-V outlet has 2.0 A of current in it. What is the power of this device?
a.
48 W
c.
240 W
b.
60 W
d.
480 W
 

 27. 
A circuit breaker acts as a switch creating a(n) _____ circuit when current is too high.
a.
closed
c.
open
b.
series
d.
parallel
 

 28. 
What voltage is required to pass 0.5 A of current through a 4.5-W bulb?
a.
0.11 V
c.
3 V
b.
2.25 V
d.
9 V
 

 29. 
There is a repulsive force between two charged objects when
a.
their charges are of unlike sign.
b.
they have the same number of protons.
c.
their charges are of like sign.
d.
they have the same number of electrons.
 

 30. 
Electric force varies depending on the
a.
charge and distance between charged objects.
b.
charge and mass of charged objects.
c.
height and mass of charged objects.
d.
mass and distance between charged objects.
 

 31. 
Batteries typically have
a.
two positive terminals.
b.
two negative terminals.
c.
one positive and one negative terminal.
d.
no terminals.
 

 32. 
An electric current is produced when charges are accelerated by an electric field to move to a position of potential energy that is
a.
higher.
c.
equal.
b.
lower.
d.
infinite.
 

 33. 
Resistance is caused by
a.
internal friction.
c.
proton charge.
b.
electron charge.
d.
kinetic energy.
 

 34. 
The SI unit of resistance is the
a.
volt.
c.
ohm.
b.
ampere.
d.
joule.
 

 35. 
What is the potential difference across a resistor that dissipates 5.00 W of power and has a current of 5.0 A?
a.
1.0 V
c.
125 V
b.
4.00 V
d.
0.20 V
 



 
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