Name: ________________________ Class: ___________________ Date: __________
Exam 4--PHYS 151--S15
Multiple Choice
Identify the choice that best completes the statement or answers the question.
6. Resistors _________ the flow of electricity in a
circuit.
a. stop
b. limit
c. force
d. increase
1. A positively charged atom is called a/an:
a. pion
b. anion
c. cation
d. pluon
2. The magnitude of the force between two charged
particles is dependent on the
I. Electric charge of the particles
II. Distance between the particles
III. Radius of the particles
IV. Mass of the particles
a.
b.
c.
d.
7. Which of these parts of the body has a higher
resistance?
a. inside the body
b. dry skin
8. Neurons have two types of extensions. They are
dendrites and _________.
a. glands
b. myelins
c. axons
d. membranes
I, II, and III
II & IV
all of these
I & II
3. The electric field is a measure of the _________
per charge.
a. mass
b. potential
c. force
d. energy
9. In the neuron, the potential inside the cell is usually
___________.
a. positive
b. negative
c. zero
d. neutral
4. The units for electric potential are
a. joules
b. newtons/coulomb
c. volts
d. potages
10. When a strong stimulus affects the body, the
affected neurons will experience a/an __________
causing them to transmit the appropriate
information to the central nervous system.
a. ATP pump
b. nodes of Ranvier
c. action potential
d. resting potential
5. A capacitor consists of 2 metal plates of area, A,
and separation, d. If the area of the plates is
doubled, by what amount is their capacitance
changed?
a. 1/2
b. 1/4
c. 2
d. 4
11. Generally, objects move in a direction in which
their potential energy _________.
a. increases
b. decreases
c. remains the same
1
17. Which of these are purposes of the nervous system:
I. Sensory input
II. Integration
III. Vision
IV. Motor output
a. I, II, & IV
b. I & II
c. all of these
d. I & IV
12. Which of these is not a valid charge?
a. 4.8x10-19 C
b. -3.2x10-19 C
c. 1.6x10-19 C
d. 5.2x10-19 C
e. all are valid
13. Two positive charges, which are 2 meters apart,
experience a force of 12 N. You move the two
charges to 4 meters apart. What is the new force
on the charges?
a. 3 N
b. 6 N
c. 12 N
d. 24 N
e. 48 N
18. The e-meter, used by Scientologists, measures the
___________ of the human body.
a. current
b. resistance
c. voltage
d. electric field
14. Which of these must involve, at least, 2 charges in
order to exist?
a. electric force
b. electric field
c. electric potential
d. all require 2 or more charges
19. How does the InBody 230, which we saw at the
Rec Center, analyze the body’s mass distribution?
a. with high-frequency sound waves
b. by measuring the resistance of the body
c. by sampling fluids in the body
d. by measuring the density of the body
15. Two positive particles experience a force that is
_________.
a. attractive
b. repulsive
c. non-existent
d. it depends on the magnitude of the charges
20. The InBody 230, a direct segmental
multi-frequency bioimpedance analysis device,
uses several frequencies. Why?
a. to sample brain waves of different frequencies
b. because blood has a lower density than water
c. to accommodate people of all different body
types
d. to measure, separately, the makeup of your
trunk (or torso) and appendages
16. A copper wire has a cross-sectional area of 2 m 2
and a length of 4 m. Its resistance is 12 ohms. You
increase the area of the wire to 4 m 2. What is the
resistance of this bigger wire?
a. 3 ohms
b. 6 ohms
c. 12 ohms
d. 24 ohms
e. 48 ohms
21. This positive particle sits between two charged
plates. The plate on the left has a high potential,
and the right plate has a low potential. What will
happen to the particle?
a.
b.
c.
2
it will move to the right
it will move to the left
it will remain stationary
22. Consider this figure of a neuron.
Which part of the neuron passes on an electrical signal to another neuron?
a. (1)
c. (3)
b. (2)
d. (4)
28. Which of these physical processes or properties
allow for the movement of charged particles from
one part of the neuron to another?
I. chemical diffusion
II. electric potential difference
III. gravitational forces
IV. fluid pressure
a. I & IV
b. II & IV
c. I, II, & IV
d. I & II
e. all of these
23. Which part is called the dendrite?
a. (1)
b. (2)
c. (3)
d. (4)
24. In which part of the neuron does the action
potential propagate?
a. (1)
b. (2)
c. (3)
d. (4)
25. Which part of the neuron controls the electrical
signal that passes through the neuron?
a. (1)
b. (2)
c. (3)
d. (4)
29. A capacitor serves which of these functions:
I. Resist the flow of electricity
II. Cause current to flow in a circuit
III. Store charge.
IV. Store electrical energy.
a. I & III
b. III & IV
c. III
d. I & II
26. Which part of the neuron is called the axon?
a. (1)
b. (2)
c. (3)
d. (4)
27. Which part of the neuron is called the cell body?
a. (1)
b. (2)
c. (3)
d. (4)
3
30. Consider this plot that shows the membrane
potential as a function of time. The point at a
potential of +30 millivolts is known as the
___________.
34. If you increase the distance between two
capaciative plates, the amount of charge they can
store ___________.
a. increases
b. decreases
c. remains the same
d. it depends on how far you increase the distance
35. Electric potential is a measure of ____________.
a. energy per charge
b. force per charge
c. force
d. voltage per charge
a.
b.
c.
d.
36. Which of these has units of newtons per coulomb?
a. potential difference
b. electric potential
c. electric forces
d. electric fields
e. potential energy
action potential
resting potential
threshold potential
depolarization
31. A lithium atom is made into a positive lithium ion
by:
I. adding a proton
II. taking away an electron
III. adding a neutron
a. only I
b. either I or II
c. only II
d. I, II, or III
e. none of these
37. If I insert an insulator between the plates of a
capacitor, that capacitor will now be able to store
_______ charge.
a. more
b. less
c. the same amount of
38. Which of these are the units of current?
a. coulomb/second
b. joules/coulombs
c. joules/second
d. newtons/coulomb
32. Two positive particles, which are separated by 2
meters, have a potential energy of 8 joules. If you
move them to 4 meters apart, how much potential
energy do they now have?
a. 2 J
b. 4 J
c. 8 J
d. 16 J
e. 32 J
39. A 50 watt light bulb operates at a voltage of 100 V.
What is the current through the bulb?
a. 5 A
b. 500 A
c. 2 A
d. 0.5 A
33. Consider the plot in the previous question. The
point at a potential of -70 millivolts is known as the
___________.
a.
b.
c.
d.
40. Devices with a high power rating, such as a hair
dryer, have very large currents flowing through
them. How does the resistance of a high-power
device compare with a low-power device?
a. the high-power device has a larger resistance
b. the high-power device has a smaller resistance
c. they have the same resistance
resting potential
action potential
threshold potential
depolarization
4
ID: A
Exam 4--PHYS 151--S15
Answer Section
MULTIPLE CHOICE
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REF: S15
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ID: A
40. ANS: B
PTS: 1
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