287 In the Northern Hemisphere, the Coriolis Effect deflects air to the:
O right.
O left.
O does not deflect the air at all.
O north
288 Which weather phenomenon signals the start of the mature stage of a thunderstorm cell?
O The start of precipitation.
O The appearance of an anvil top.
O The growth-rate of the cell is maximum.
O The appearance of updraft
289 Thunderstorm cells should be avoided by at least:
O 10 nm.
O 40 nm.
O 30 nm.
O 25 nm
290 The Adiabatic Lapse Rate for a dry parcel of air is:
O 3°C/1000 ft.
O 1.98°C/1000ft.
O 1.5°C/1000ft.
O 2.5°C/1000ft
291 With respect to High and Low pressure systems, which of the following state¬ ments is true?
O A High pressure area, or Ridge, is an area of descending air.
O A High pressure area, or Ridge, is an area of ascending air.
O A Low pressure area, or Trough, is an area of descending air.
O A Low pressure area, or Ridge, is an area of descending air
292 In the Northern Hemisphere, an aircraft flying from High to Low pressure will experience:
O starboard drift.
O no drift.
O port drift.
O drift to the south
293 Select the true statement concerning isobar and windflow patterns around High and Low pressure systems, as shown on Synoptic Charts:
O When the isobars are close together, the pressure gradient force is stronger and wind velocities are higher.
O Surface winds flow perpendicular to the isobars.
O When the isobars are far apart, crests of standing waves may be marked by lenticular clouds.
O When the isobars are close together, the pressure gradient force is weaker and wind velocities are lower.
294 The primary distinction between the Troposphere and the Stratosphere is a difference in:
O temperature lapse rates.
O moisture content.
O pressure.
O oxygen content
295 The precipitation associated with the passage of a cold front usually extends horizontally by approximately:
O 30 to 50 nautical miles.
O 100 to 200 nautical miles.
O 200 to 500 nautical miles.
O 150 to 250 nautical miles
296 As a parcel of air rises, it cools. In doing so, its ability to retain water vapour:
O decreases.
O increases.
O remains unchanged.
O it depends on the pressure
297 Employing Buys Ballot's Law, if you stand facing the wind in the Northern Hemisphere, the low pressure is:
O on your right.
O on your left.
O in front of you.
O behind you
298 Ice crystals may be converted directly to water vapour. What is this process called?
O Sublimation.
O Supercooling.
O Supersaturation.
O Evaporation
299 The percentage gases, other than nitrogen, oxygen and water vapour, in the atmosphere is:
O 1%.
O 5%.
O 3%.
O 2%
300 The heat energy required to change state from liquid water to water vapour without an increase in temperature is:
O latent heat.
O transient heat.
O retained heat.
O evaporation heat
301 Which is a characteristic of stable air?
O Restricted visibility.
O Cumuliform clouds.
O Excellent visibility.
O Turbulence
302 Which of the following processes can produce fog?
O Advection.
O Divergence.
O Convection.
O Convergence
303 The observed temperature at the surface is +11°C and at 4000 feet the temper¬ature is +16°C. The state of the atmosphere can be described as:
O Stable.
O Unstable.
O Conditionally stable.
O It depends on the humidity
304 When a wind changes direction from Southerly to South-Westerly, it is said to have:
O veered in either hemisphere.
O veered in the Northern hemisphere and backed in the Southern hemi¬sphere.
O backed in the Northern hemisphere and veered in the Southern hemi¬sphere.
O backed in either hemisphere
305 A typical warm front extends horizontally for approximately:
O 600 miles.
O 200 miles
O 100 miles.
O 50 miles
306 Following the passage of a typical cold front, an observer at the surface would expect to experience which of the following conditions?
O (Pressure)> steady rise. (Clouds)>SCT/BKN Cu. (Visibility)> generally good
O (Pressure)> fall then rise. (Clouds)>BKNCu/Scu. (Visibility)> poor with fog
O (Pressure)>falling rapidly. (Clouds)>OVC NS/St. (Visibility)>very poor
O (Pressure)> rising rapidly. (Clouds)>OVC Ci/Cc. (Visibility)>Poor
307 Mist and fog occur when small water droplets are suspended in the air, hence reducing visibility. What is the difference between mist and fog?
O Fog is defined as having a visibility less than 1 kilometre
O Fog has a slightly lower Relative Humidity than mist.
O Mist is defined as having a visibility less than 1 kilometre.
O Fog is defined as having a visibility less than 1.5 kilometre
308 Over land in mid latitudes, which statement concerning the diurnal variation oftemperature is most appropriate?
O Maximum temperature occurs at around 1400-1500 LMT, with the minimum temperature occurring just before dawn.
O Maximum temperature occurs at around 1400-1500 UTC, with the minimum temperature occurring just before dawn.
O Maximum temperature occurs around midday, with the minimum temperature occurring just after sunset.
O It depends on the longitude
309 (Fig.52) Gust-fronts are usually associated with:
O thunderstorms.
O high pressure areas.
O castellanus.
O lenticularis
310 In the International Standard Atmosphere (ISA) the temperature is assumed to decrease at the rate of:
O 1.98°C per 1000 feet.
O 2°K per 1000 feet.
O 1.98°C per 1000 metres.
O 3°C per 1000 feet
311 The decode for hail in a METAR is
O GR
O PE
O SN
O HZ
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