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Instructor(s): Prof. Seiberling
PHYSICS DEPARTMENT
MET 1010
1st Midterm Exam
Name (print, last first):
Sept. 20, 2004
Signature:
On my honor, I have neither given nor received unauthorized aid on this examination.
YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE.
(1) Code your test number on your answer sheet (use 76–80 for the 5-digit number). Code your name on your
answer sheet. DARKEN CIRCLES COMPLETELY. Code your UFID number on your answer sheet.
(2) Print your name on this sheet and sign it also.
(3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of
the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout with
scratch work most questions demand.
(4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink. Do not
make any stray marks or some answers may be counted as incorrect.
(5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing.
(6) Hand in the answer sheet separately.
There are 32 multiple choice questions. Clearly circle the one best answer for each question. If more than one answer is
marked, no credit will be given for that question, even if one of the marked answers is correct. Guessing an answer is better
than leaving it blank. All questions are worth 3 points each, except for four questions, which are worth 4 points each. The
points for each 4-point question are indicated by each problem. Good Luck!
1. (4 points) A gallon of water in an insulated container, and a rock are sitting next to each other on a table. The rock
has the same weight as the water and they start out at the same temperature. If 100 Cal of heat then enters the water
and 100 Cal of heat enters the rock, and no heat or matter escapes either one, which statement below is true?
(1)
(2)
(3)
(4)
(5)
both the water and the rock will rise in temperature by the same amount
the rock will become warmer than the water
the water will become warmer than the rock
the water will cool while the rock heats up
the rock will cool while the water heats up
2. In a blinding snowstorm in Vermont, the air temperature and dew point temperature are both 30◦ F. Meanwhile, under
clear skies in Arizona, the air temperature is 85◦ F and the dew point is 38◦ F. From this information, you can conclude:
(1)
(2)
(3)
(4)
(5)
no conclusions can be drawn about the water vapor content of the air
there is more water vapor in the air in Vermont
there is more water vapor in the air in Arizona
Arizona and Vermont have the same amount of water vapor in the air
Arizona and Vermont are both being influenced by easterly winds
3. Visible light ranges in wavelength from 0.4µm to 0.7µm. A particle in the atmosphere having a diameter of 2µm would
be most likely to scatter which color of light?
(1) red
(2) violet
(3) all wavelengths would scatter equally
(4) orange
(5) green
4. Light reflected from a surface that is NOT flat is called:
(1) diffracted light
(2) refracted light
(3) polarized light
(4) dispersed light
(5) diffuse scattered light
5. On a cold night, you are standing facing a large bonfire. Your front side is warm while your backside is cold. You are
receiving heat from the bonfire primarily through:
(1) osmosis
(2) latent heat
(3) convection
(4) radiation
(5) conduction
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6. Evaporative coolers are primarily used in climates where summers are:
(1) hot and dry
(2) mild and humid
(3) hot and humid
(4) cool and dry
(5) cool and humid
7. When heat is transferred from the surface of the earth to the atmosphere by conduction, each individual air molecule:
(1)
(2)
(3)
(4)
(5)
travels upward only
emits infrared radiation that travels upward and is absorbed by other air molecules
travels less than a centimeter
travels a few meters
becomes part of a cloud
8. The “wet road” mirage is caused by:
(1)
(2)
(3)
(4)
(5)
condensation of water due to very high humidity
heat waves that cause the light near the road to shimmer
dispersion, which bends blue light into your eye
convection, which causes turbulence of air near the road
refraction, which makes the sky appear in the road
9. (4 points) People require heat when the mean daily temperature drops below 65◦ F. During one week in Gainesville last
December, the average overnight low was 25◦ F and the average daytime high was 45◦ F. How many heating degree-days
were generated that week?
(1) 245
(2) 400
(3) 175
(4) 315
(5) 210
10. You fill a glass completely full of water and cover the top with a rigid, flat piece of plastic. When you turn the glass
upside-down, the water stays inside the glass, rather than falling out. What holds the lid on?
(1) surface tension
(2) an inversion
(3) capillary action
(4) atmospheric pressure
(5) gravity
11. What is the approximate latitude of Gainesville, Florida?
(1) 15◦ N
(2) 0◦
(3) 45◦ N
(4) 60◦ N
(5) 30◦ N
12. Which statement is true of the stratosphere?
(1)
(2)
(3)
(4)
(5)
the temperature increases as you go higher
it is the atmospheric layer in which most of the earth’s weather occurs
the pressure increases as you go higher
ozone is the most abundant gas
chlorofluorocarbons (CFC’s) are the most abundant gas
13. The temperature at which water boils depends mainly on:
(1) air pressure
(2) the specific heat of air
(3) air temperature
(4) air density
(5) relative humidity
14. The sun is directly overhead at noon at the equator on:
(1) March 21 and Sept. 22
(2) every day of the year
(3) Dec. 21
(4) June 22
(5) June 22 and Dec. 21
15. On a hot, humid day in the tropics, water vapor would comprise about what percent of the atmosphere?
(1) 35%
(2) 50%
(3) 75%
(4) 4%
(5) 20%
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16. Rock A has a higher albedo than rock B, but is otherwise identical to B. If both rocks start at the same temperature,
then are exposed to the same amount of sunlight:
(1)
(2)
(3)
(4)
(5)
rock A will remain cooler than rock B
neither rocks will change temperature
rock B will cool while rock A heats up
both rocks will rise in temperature by the same amount
rock B will remain cooler than rock A
17. Use the Saturation Vapor Pressure table provided to answer the following two questions: The temperature in a closed
room is 80◦ F. What is the saturation vapor pressure in this room?
(1) 35 mb
(2) 48.1 mb
(3) 27 mb
(4) 21 mb
(5) 12.3 mb
18. (4 points) If the dew point in this same room is 50◦ F, what is the relative humidity in the room?
(1) 35%
(2) 50%
(3) 63%
(4) 21%
(5) 77%
19. On a clear, calm night, the ground and air above cool mainly by this process:
(1) convection
(2) reflection
(3) evaporation
(4) radiation
(5) conduction
20. A north wind:
(1)
(2)
(3)
(4)
(5)
is any cold, moist wind
is any cold, dry wind
blows toward the north
blows from the north
is a wind that blows in winter
21. If there were no atmosphere on the earth:
(1)
(2)
(3)
(4)
(5)
the sky would still be blue
the sky would appear black during the day
the sky would appear white during the day
twilight would last longer
the sun would appear red all day
22. When white light enters glass from air, which color is bent the furthest from the original direction of the light?
(1) orange
(2) red
(3) green
(4) violet
(5) yellow
23. Suppose you drive east to school and west from school on a road that runs directly east/west. On which of the following
days are you most likely to have the sun directly in your eyes while driving to and from school?
(1) Dec. 21
(2) Nov. 10
(3) June 21
(4) May 15
(5) March 21
24. An insulated glass beaker contains a mixture of ice and water at equilibrium. If a small amount of heat is removed
from the contents of the beaker and it is allowed to come to equilibrium again:
(1)
(2)
(3)
(4)
(5)
the temperature of the mixture will increase
some of the water will freeze, but the temperature of the mixture will remain constant
the temperature of the mixture will drop
some of the water will freeze and the temperature of the mixture will drop
some ice will melt at constant temperature
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25. The most abundant gas in the stratosphere is:
(1) nitrogen
(2) chlorofluorocarbons
(3) ozone
(4) carbon dioxide
(5) oxygen
26. Without the atmospheric greenhouse effect, the earth’s average surface temperature would be:
(1)
(2)
(3)
(4)
(5)
more variable than it is now
higher than at present
lower than at present
the same as it is now
less variable than it is now
27. Lines connecting points of equal temperature are called:
(1) isotherms
(2) isologs
(3) contours
(4) thermographs
(5) isobars
28. What gas is produced naturally in the stratosphere and is also a primary component of photochemical smog in polluted
air at the surface?
(1) hydrocarbons
(2) ozone
(3) carbon dioxide
(4) carbon monoxide
(5) nitrogen dioxide
29. Suppose the air in your yard cools to the dew point by 11pm one night. If the air continues to cool during the night,
in 5 hours the dew point temperature will probably:
(1)
(2)
(3)
(4)
(5)
increase as the air becomes moister
increase as the air becomes drier
not have changed
decrease as the air becomes drier
decrease as the air becomes moister
30. To see a rainbow in the evening, you would face toward the:
(1) it could be any direction
(2) south
(3) east
(4) north
(5) west
31. (4 points) What is the ratio of energy of a blue photon to a red photon? (the wavelength of a blue photon is 0.46µm
and the wavelength of a red photon is 0.69 µm)
(1) 4.6
(2) 3.0
(3) 9.6
(4) 0.67
(5) 1.5
32. A flask half filled with water has all of the air in it evacuated using a vacuum pump. The flask is tightly sealed, so that
the only molecules above the water are water vapor molecules. After equilibrium is reached, with the flask at 70◦ F,
what is the total pressure above the water? (see figure)
(1) 0 mb
(2) 70 mb
(3) 25 mb
(4) 10.2 mb
(5) 1000 mb
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