Name: ________________________ Class: ___________________ Date: __________
Exam 2--PHYS 151--S15--Chapters 3 & 4
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. A man pushes a box across the floor. The
frictional forces acting on the box ________.
a. do positive work.
b. do negative work
c. do no work at all.
d. (it depends on the mass of the box)
6. Which of these are appropriate units for work?
a. joules
b. calories
c. newtons*meters
d. all of these
7. Power is the rate at which ___________________.
a. work is done
b. force is displaced
c. temperature changes
d. energy is conserved
2. Is it possible to do work on an object that is at rest?
a. Yes
b. No
3. You double the speed of an object. By how much
has the kinetic energy increased?
a. 1/2
b. 1/4
c. 2
d. 4
e. the energy is the same as before.
8. Muscles have a very low efficiency, about 20%. If
a muscle with this efficiency uses 100 Calories of
energy, how much work will it actually do?
a. 20 Cal
b. 120 Cal
c. 80 Cal
d. 100 Cal
4. You throw a ball up in the air. Which of these
statements best describes the energy of the ball at
the top of the trajectory?
a. The ball has no kinetic energy and maximum
potential energy.
b. The ball has no potential energy and maximum
kinetic energy.
c. The ball has neither kinetic energy nor
potential energy.
d. The ball’s kinetic and potential energies are at
their maximum.
9. The kelvin temperature scale is based on two
physical temperatures. Which of these is one of
those temperatures
a. -73 degrees
b. the evaporation energy of water
c. the freezing point of water
d. the boiling point of water
10. Conduction and radiation are two ways to transfer
energy. What is the third?
a. convection
b. conversation
c. continuation
d. condensation
5. Three balls of equal mass start from rest and roll
down different ramps. All ramps have the same
height. Which ball has the greater speed at the
bottom of its ramp?
a.
b.
c.
d.
11. For which of these temperature scales is a change
in 1 degree the smallest change in temperature?
a. fahrenheit
b. kelvin
c. 1 degree is each is the same
d. celsius
a
b
c
All have the same speed
1
17. When blood vessels dilate, the body is ______
itself.
a. cooling
b. warming
c. it depends on the outdoor temperature.
12. Consider this roller coaster. At which location
does the cart have the most potential energy?
18. Most of the body’s heat is lost by which of these
mechanisms?
a. radiation
b. convection
c. conduction
d. sweating
a.
b.
c.
d.
e.
19. Which of these is a way the body warms itself:
I. Sweating
II. Shivering
III. Contraction of blood vessels in the skin
IV. Increase BMR
a. I & IV
b. II & III
c. I, II, & III
d. II, III, & IV
A
B
C
D
the cart has the same PE at all locations
13. Consider the roller coaster in the previous figure.
At which location does the cart have the highest
speed?
a. A
b. B
c. C
d. D
e. the cart has the same speed at all locations
20. Which of these nutrients provides the most energy
per unit mass?
a. carbohydrates
b. proteins
c. sugars
d. water
e. lipids
14. Typical indoor room temperature is
a. 20°C
b. 40°C
c. 60°C
d. 70°C
21. The following describes thermal conduction. The
thermal conduction through a rod of a certain
material is 2 kcal/s. If the length of that rod is
doubled, what is the new rate of thermal
conduction?
Q
A∆T
=k
t
d
a. 1 kcal/s
b. 2 kcal/s
c. 4 kcal/s
d. 8 kcal/s
e. 16 kcal/s
15. Two object have the same mass and initial
temperature, but object A has a higher specific heat
than object B. Which object will require more
energy to raise the temperature by 20°C?
a. object A
b. object B
c. both will require the same amount of energy
16. Which of these materials has the lowest specific
heat?
a. wood
b. copper
c. air
2
27. The velocity of a wave is 2 m/s. Its period is 2s.
What is the wavelength of the wave?
22. This figure shows three blocks; each is moving to
the right. Which of the forces F is doing negative
work?
a.
b.
c.
d.
a.
b.
c.
d.
2m
0.5 m
1m
4m
28. The Bernoulli effect describes the effects of fluid
flow. What happens to the pressure of a fluid if
the velocity is increased?
a. the pressure increases
b. the pressure decreases
c. the pressure stays the same
a
b
c
none of these
29. Which of these shows the wavelength of this
transverse wave?
23. The food unit of energy is the
a. Watt
b. Calorie
c. Joule
d. calorie
24. What is homeostasis?
a. the amount of energy required to raise the
temperature of a substance
b. a condition when the body overheats.
c. the ability of the body to maintain a stable
temperature
d. the transfer of thermal energy
a.
b.
c.
d.
25. BMR is an abbreviation for
a. benign mass retort
b. bastian metabolism reticent
c. basal metabolic rate
d. none of these
A
B
C
D
30. The human ear can typically hear sounds in this
frequency range:
a. 2,000-2,000,000 Hz
b. 2,000-20,000 Hz
c. 0.2-2,000 Hz
d. 20-20,000 Hz
e. 2-200 Hz
26. Which of these statements is not true for a
longitudinal wave?
a. it is periodic
b. it carries energy
c. the medium moves up & down
d. it has a wavelength
e. the medium moves back & forth
31. The spring constant, k, describes the ___ of a
spring
a. stiffness
b. frequency
c. mass
d. wavelength
3
37. You stand 1 meter from a point source of sound,
and the intensity is I. If you move to 2 meters away
from the point source, what is the new intensity?
a. I
b. 2I
c. 4I
d. ¼I
e. ½I
32. Consider this diagram for the next set of questions:
38. Consider this figure. What best describes the part
labeled (1)?
Which of these is called the tympanic membrane?
a. (2)
b. (4)
c. (5)
d. (6)
e. (7)
33. From the above diagram, which part is connected
to the larynx?
a. (1)
b. (2)
c. (3)
d. (5)
e. (7)
a.
b.
c.
d.
e.
thyroid
glottis
vocal cords
larynx
trachea
39. Consider the previous figure. What is the part
labeled (2)?
a. glottis
b. trachea
c. vocal cords
d. thyroid
e. larynx
34. From the above diagram, which fluid-filled
chamber translates vibrations into an electrical
signal?
a. (3)
b. (4)
c. (5)
d. (6)
e. (7)
40. A sonic boom occurs when the speed of the vehicle
exceeds the ____.
a. wave frequency
b. wave period
c. wave speed
d. wavelength
35. During a time of one period, a wave travels ___.
a. one amplitude
b. one wavelength
c. with a frequency of 1 Hz
d. it depends on the period
36. Intensity is defined as which of these:
a. Area/Power
b. Power*Area
c. Power
d. Power/Area
4
47. Sound is a ____________ wave.
a. simple
b. transverse
c. compressional
d. hand
41. Consider these 3 waves. Which has the higher
frequency?
48. The volume of a sound is characterized by its...
a. frequency
b. amplitude
c. pitch
d. phase
a.
b.
c.
d.
49. The frequency of a wave is 20 Hz. What is its
period?
a. 2 s
b. 400 s
c. 20 s
d. 1 s
20
A
B
C
all the same
42. Consider the 3 waves in the previous problem.
Which has the longer wavelength?
a. A
b. B
c. C
d. all the same
50. In a sound wave, condensations are an area of
________ pressure.
a. high
b. low
43. What is the function of the ossicles, the 3 small
bones in the ear (malleus, incus, stapes)?
a. to convert vibrations to an electrical signal
b. to resonate with particular frequencies of sound
c. transfer vibrations from the eardrum to the
cochlea
d. to vibrate the vocal cords
51. Two strings have the same mass and tension. One
string is longer. Which creates a higher pitched
sound when plucked.
a. the long string
b. the short string
c. both have the same pitch
52. “Infrasonic” refers to a frequency ________ than
the range of frequencies heard by humans.
a. greater
b. less
44. Vibration of the vocal cords is caused by which of
these phenomena?
a. Boyle’s Law
b. Pascal’s principle
c. Resonance
d. Bernoulli effect
45. Men’s voices are lower-pitched, primarily, because
they ____.
a. have more testosterone
b. have more massive vocal cords
c. have longer vocal cords
d. are taller
46. True or false: Sound can travel through a vacuum.
a. True
b. False
5
ID: A
Exam 2--PHYS 151--S15--Chapters 3 & 4
Answer Section
MULTIPLE CHOICE
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