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 THERMO QUIZ

METEOROLOGIST JEFF HABY

The following 20 question quiz asks multiple choice questions based on the information covered at the links of the following webpage: http://www.theweatherprediction.com/thermo/ under the headings "Skew-T Log-P Education and Indice Interpretation", "Skew-T Application", "Thermo Course" and other sources.

An answer key is provided at the bottom of this webpage.

1. This is defined as the mass of water vapor divided by the mass of dry air in a sample of air.
a. Relative humidity
b. Mixing ratio
c. Absolute humidity
d. Specific humidity

2. This is defined as the pressure exerted by water vapor alone in a sample of air.
a. Relative humidity
b. Mixing ratio
c. Vapor pressure
d. Absolute humidity
e. Specific humidity

3. Equivalent potential temperature is also known as:
a. Saturation mixing ratio
b. Virtual temperature
c. Wet-bulb temperature
d. Theta-E

4. The convective temperature is most likely to be reached on a sunny day in which the boundary layer is:
a. Warm and moist
b. Warm and dry
c. Cold and moist
d. Cold and dry

5. This is the pressure level in which a parcel of air becomes equal again to the surrounding environmental temperature after the parcel rises through CAPE region. This is the pressure level at the top of the most significant CAPE region on a sounding.
a. MPL
b. EL
c. CCL
d. LCL

6. This Index has the formula: (T850 - T500) + (Td850 - Tdd700)
a. SWEAT
b. EHI
c. KI
c. TT

7. This is a (in)stability index that compares the 500 mb surface based parcel temperature to the 500 mb sounding temperature.
a. CAPE
b. Lifted Index
c. K index
d. EHI

8. From the surface, an inverted-V sounding will _____________ in dewpoint depression with height.
a. Increase
b. Decrease

9. As a parcel of air sinks dry adiabatically it will ______________.
a. Warm
b. Cool

10. A parcel rises wet adiabatically by 1 kilometer. If dry adiabatic cooling is 10 C/m and condensation warms the parcel by 4 C than it otherwise would be due to latent heat release, then the parcel would have cooled by __________ C as it rose the 1 kilometer.
a. 14
b. 8
c. 6
d. 4

11. In a sample of tropospheric air near the surface, water vapor will be about ____________ percent of the air sample by volume.
a. 0.2 to 1
b. 1 to 4
c. 7 to 10
d. 15 to 20

12. A significant temperature decrease with height is termed a(n):
a. Stable lapse rate
b. Isothermal lapse rate
c. Inversion
d. Steep lapse rate

13. A layer in which the surface based parcel is colder than the environmental temperature is a ___________ layer.
a. Unstable
b. Stable

14. This is a circular plot that shows how the wind speed and direction change with height.
a. Hodogram
b. Skew-T Log-P diagram
c. Forecast model
d. Hodograph

15. Winds that turn ______________ with height are termed a backing wind.
a. Clockwise
b. Counterclockwise

16. When air of two different temperatures mix, the heat content will balance out over time and the two air samples will eventually come into thermal equilibrium. When heat travels to balance the heat content, it travels from ________________ air.
a. Warmer toward colder (excess toward deficit temperature)
b. Colder toward warmer (deficit toward excess temperature)

17. If a baseball is hit exactly the same each time, in which situation will be ball travel the furthest (ignore wind and other effects not stated in answers).
a. Cold and dry air
b. Cold and moist air
c. Warm and dry air
d. Warm and moist air

18. Which of the following would not work on the moon?
a. Astronaut golf
b. Astronaut sky diving
d. Astronaut long jump

19. The lightest gas is:
a. Helium
b. Water vapor
c. Oxygen
d. Hydrogen

20. There is no limit to how much an object can cool. An object can cool to negative infinity.
a. True
b. False

KEY

1. B
2. C
3. D
4. A
5. B
6. C
7. B
8. B
9. A
10. C
11. B
12. D
13. B
14. D
15. B
16. A
17. D
18. B
19. D
20. B