TEMA 1: 1. The international standard atmosphere assumes a lapse rate of:
2ºC / 1000ft.
1.5ºC / 1000ft.
3ºC / 1000ft.
1.98ºC / 1000ft.
2. The tropopause is:
The line where the temperature no longer decreases with increase of height.
The layer between the tropopause and the stratosphere.
The layer beyond which only CI clouds occurs.
The line indicating clear air turbulence.
3. One of the most important characteristics of the atmosphere is:
Density is constant above 10.000ft.
The air is a poor conductor of heat.
Temperature lapse rate is very frequently above 3ºC per 1000ft.
The air is a good conductor of heat.
4. Most of the vapor in the atmosphere is contained in the:
Tropopause.
Stratosphere.
Troposphere.
Stratopause.
5. The captain of an aircraft needs to know the height of the tropopause because:
It normally represents the limit of weather.
Density starts to increase.
There are no longer jet streams and CAT.
It indicates the height of the thermal wind.
6. The main Ozone layer is to be found in the:
Termosphere.
Mesosphere.
7. The level in the atmosphere where the air temperature ceases to fall with increase in height is known as:
The troposphere.
The stratopause.
The stratosphere.
The tropopause.
8. Which statement is correct when considering the lower layers of the atmosphere:
The majority of the weather is contained in the stratosphere and its upper boundary is the tropopause.
The majority of the weather is contained in the troposphere and its upper boundary is the tropopause.
The majority of the weather is contained in the tropopause and its upper boundary is the troposphere.
The majority of the weather is contained in the troposphere and its upper boundary is the stratosphere.
9. The atmosphere is a mixture of gases of the following proportions:
Oxygen: 21%, Nitrogen 78% and other gases 1%.
Oxygen 21%, Hydrogen 78% and other gases 1%.
Nitrogen 78 %, Argon 21% and Oxygen 1%.
Nitrogen 78%, Oxygen 21% and Hydrogen 1%.
10. In the ISA, the temperature is isothermal:
Up to 36.090ft / 11km.
From 36.090ft / 11km to 65.617ft / 20km.
From 36.090ft / 11km to 104.987ft / 32km.
From 36.090ft / 11km to 45.090ft / 13.75km.
11. The Internacional (ICAO) Standard Atmosphere assumes that the sea level atmospheric pressure is:
1013.25 mbs and decreases with an increase in height.
1013.25 mbs and increases with an increase in height.
1013.25 mbs and falls to about half this value at 30.000ft.
1013.25 mbs and decreases with an increase in height up to the tropopause. Above the tropopause, it remains constant.
12. At sea level, the ISA density is stated to be:
1225 grammes per cubic metre.
1252 grammes per cubic metre.
1013.2 mbs (hPa).
29.6 inches of mercury.
13. Which of the following statements is most correct when describing ISA:
The MSL pressure is 1013.25 mbs and the temperature is +15ºC.
The MSL pressure is 1013.24 mbs and the temperature is +15ºC with a lapse rate of 1.98ºC / 1.000ft.
The MSL pressure is 1013.25 mbs and the temperature is +15ºC with a lapse rate of 1.98ºC / 1.000ft up to 36.090ft above which there is frequently an inversion.
The MSL pressure is 1013.25 mbs and the temperature is +15ºC with a lapse rate of 1.98ºC / 1.000ft up to 36.090ft.
14. The following is true for the International Standard Atmosphere:
At Mean Sea Level, the following conditions prevail: Temperature +15ºC, pressure 1013.25 hPa, density 1125 g/m3.
Within the troposphere, the temperature decreases by 6.5ºC per km.
The tropopause is at a height of 36.090ft AGL.
The temperature at the tropopause is 226.5K.
15. Pressure ______ with increase of height and in the ISA pressure will be _____ at 10.000ft and ______ at 30.000ft.
Increase, 800mbs, 400 mbs.
Decrease, 700 mbs, 300 mbs.
Increase, 200 mbs, 800 mbs.
Decrease, 500 mbs, 200 mbs.
TEMA 2: 1. The measurement of surface temperature is made:
At ground level.
At approximately 10 meters above ground level.
At approximately 4 feet above ground level.
At approximately 4 meters above ground level.
2. Cloud cover will reduce diurnal variation of temperature because:
Incoming solar radiation is partially reflected back to space and outgoing terrestrial radiation is reflected back to earth.
Incoming solar radiation is re-radiated back to the space and atmospheric heating by convection will stop at the level of the cloud layer.
The clouds stops the sun rays getting through to the earth and also reduces outgoing conduction.
Incoming solar radiation is partially reflected back to space and outgoing terrestrial radiation is mostly re-radiated from the cloud layer to the surface.
3. Most accurate temperatures above the ground level are obtained by:
Tephigram.
Aircraft reports.
Temperature probes.
Radio sonde.
4. The diurnal variation of temperature is:
Greater over sea than over land.
Less over desert areas than over temperature grassland.
Reduced anywhere by the presence of cloud.
Increased anywhere as wind speed increases.
5. Over continents and oceans, the relative temperature conditions are:
Warmer in winter over land, colder in summer over sea.
Colder in winter over land, warmer in winter over sea.
Cold in winter over land and sea.
Warmer in summer over land and sea.
6. The process of change of state from a liquid mass to a gas mass is:
Condensation in which latent heat is released.
Evaporation in which latent heat is released.
Condensation in which latent heat is absorbed.
Evaporation in which latent heat is absorbed by the mass.
7. Air is classified as dry or saturated according to its relative humidity. If the relative humidity were 95% the air would be classified as:
Conditionally saturated.
Not saturated.
Saturated.
Dry.
8. On a wet bulb thermometer in an unsaturated atmosphere there will be a reduction of temperature below that of the dry bulb thermometer because:
Heat is absorbed during the process of condensation.
Heat is released during the process of condensation.
Heat is absorbed by the thermometer during the process of evaporation.
Heat is released from the thermometer during the process of evaporation.
9. Relative humidity is:
Air temperature over wet bulb temperature x100.
Air temperature over dew point temperature x100.
The actual mixing ratio of water vapor in a sample of air over the maximum mixing ratio of water vapor that this sample can contain x100.
The maximum amount of water vapor that a sample of air can contain over the actual amount of water vapor the sample does contain x100.
10.Absolute humidity is:
The number of water droplets in a given quantity of air.
The mass of water vapor that a volume of air holds.
The maximum amount of water vapor that a given quantity of air can hold.
The maximum number of water droplets that a given quantity of air can hold.
11. Wet bulb temperature would normally be lower than the dry bulb temperature because:
Condensation causes a release of latent heat.
Evaporation causes cooling of the bulb.
Latent heat is absorbed by the bulb thermometer.
Of condensation on the muslin wick of the bulb.
12. The wet bulb temperature:
Is measured using a hydrometer.
Is the minimum temperature to which a thermometer bulb can be cooled by the evaporation of water.
Measures the dew point of air.
Is the minimum temperature reached by the surface of the earth as measured by a thermometer placed 1.2 meters above the ground.
13. Which one of the following statements relating to atmospheric humidity is correct:
If the air temperature falls then the absolute humidity must increase.
The absolute humidity is the mass of water contained in unit volume of air.
The diurnal variation of dewpoint temperature is greatest when skies are clear at night.
The dew point temperature is the temperature indicated by the wet bulb thermometer.
14. When condensation takes place, the higher temperature, the _____ the amount of latent heat _____.
Lesser, released.
Greater, absorbed.
Greater, released.
Lesser, absorbed.
15. When water vapor changes to ice:
Latent heat is absorbed.
Specific heat is released.
Latent heat is released.
Specific heat is absorbed.
16. Throughout the 24 hours of a day, the Relative Humidity can be expected to:
Increase during the day and decrease at night.
Star reasonably constant throughout the 24 hours.
Reduce during the day and increase at night.
Only change with a change of airmass.
17. During a night with a clear sky, surface temperature will ____ RH will ______ and dew point will_____.
Fall, rise, rise.
Rise, rise, fall.
Fall, rise, remain the same.
Fall, fall, remain the same.
18. A change of state directly from a solid to a vapor or vice versa is:
Insolation.
Condensation.
Evaporation.
Sublimation.
19. The instrument used for measuring the humidity of air is a:
Hydrometer.
Hygrometer.
Wet bulb thermometer.
Hygroscope.
20. The process of change of state from a gas to a liquid is:
Evaporation in which latent heat is absorbed.
TEMA 3: 1. A trough of low pressure is generally associated with:
Convergence causing increased cloud and precipitation.
Divergence causing increased cloud and precipitation.
Subsidence causing increased cloud and precipitation.
Subsidence causing decreased cloud and precipitation.
2. A ridge of high pressure is generally associated with:
Divergence causing cloud to break up and more precipitation.
Divergence and subsidence causing clear skies and good weather.
3. An area of indeterminate pressure between two lows and two highs is called:
A trough.
A ridge.
A col.
A saddle.
4. An aircraft is flying at 3.000ft indicated with the altimeter sub scale set to 1020 mbs towards a mountain range with an elevation of 1.600 ft. If during the flight the QNH in the area falls to 989 mb and the altimeter sub scale is not reset, the expected clearance over the mountain range will be: (assume 27ft = 1mb)
1.400ft.
470ft.
930ft
563ft.
5. The altimeter sub scale is set to 1030mb and the altimeter reads 4.500ft QNH is 996mb. What is the altitude of the aircraft?
3.480ft.
3.990ft.
5.418ft.
3.582ft.
6. If in the southern hemisphere an aircraft in flight at 2.000ft is experiencing starboard drift, the aircraft is flying towards:
An area of high pressure.
An area of low pressure.
A warm front.
A depression.
