1a. At 25 degrees celsius, it takes 20 grams of water vapor to saturate 1 kilogr

Question

1a. At 25 degrees celsius, it takes 20 grams of water vapor to saturate 1 kilogram of dry air. If there are 5 grams of water vapor in 1 kg of air at that temperature, what is the relative humidity?

a. 10%

b. 25%

c. 50%

d. 75%

e. 100%

1b. The dry adiabatic rate of change for unsaturated air is 10°c/1000 m. What does this mean?

a. Saturated air will not change

b. Unsaturated air will get warmer or colder as it travels north or south

c. Unsaturated air will get warmer or colder as it travels in any direction

d. Unsaturated air will get warmer as it rises and colder as it sinks

e. Unsaturated air will get warmer as it sinks and colder as it rises

1c. Given an environment lapse rate of 5 degrees celesius/1000 m and a dry adiabatic of 10 degrees Celsius, what would the temperature of the air at an elevation of 2000 m if the surface air temperature is 25 degrees Celsius?

a. 25 degrees Celsius

b. 20 degrees Celsius

c. 15 degrees Celsius

d. 10 degrees Celcius

e. 5 degrees Celsius

1d. When the environmental lapse rate is greater than the dry adiabatic rate ____

a. Surface air will rise and fall

b. Surface air will rise, form clouds, and fall

c. Surface air cannot rise and will be trapped beneath colder air above

d. Surface air will rise and continue to rise

e. Surface air will not rise because this is the normal condition

1e. Which of the following is NOT a type of fog caused by cooling of near surface air to below its dew point?

a. Radiation fog

b. Frontal fog

c. Advection fog

d. Upslope Fog

1f. How does snow vary with temperature

a. Warm snow is powdery and light while cold snow is moist

b. Cold snow is powdery and light while warm snow is moist

c. Snow has a uniform moisture content but warm snow consists of larger crystals

d. Snow has a uniform moisture content but cold snow consists of larger crystals

Explanation / Answer

1a) Answer: b. 25%. Explanation: if 20 grams are needed to fully saturate, then for 5 grams, 20/5 = 4. i.e., it will saturate 100/4 =25%. 1b) Answer: e. Unsaturated air will get warmer as it sinks and colder as it rises . Explanation: As the air rises, it gets cooler and moist and needs less temperature to cool itself. 1c) e. 5 degrees Celsius Explanation: dry adiabatic rate is 10 degree / 1000m. intial temperature is 25 degrees. At 1000 m, 25-10 = 15 degrees. At 2000 m, 15 - 10 = 5 degrees. 1d) d. Surface air will rise and continue to rise. Explanation: Air becomes unstable when Environmental lapse rate is higher than dry adiabatic rate. When it is lower than the dry adiabatic rate, it becomes stable.

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