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航海英语(甲类船长)航海气象单选题练习1

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  1. You are located within a stationary high pressure area.Your aneroid barometer is falling very slowly.This indicates a(n)______.

    • A.Wind shift of 180°
    • B.Large increase in wind velocity
    • C.Decrease in the intensity of the system
    • D.Increase in the intensity of the system
  2. The wind flow from the horse latitudes to the doldrums is deflected due to ______.

    • A.Coriolis force
    • B.The mid-latitude,semi-permanent high
    • C.Differing atmospheric pressures
    • D.The prevailing westerlies
  3. The velocity of the apparent wind can be more than the true wind,and come from the same direction,if certain conditions are present.One condition is that the ______.

    • A.Ship's speed must be less than the true wind velocity
    • B.True wind must be from dead astern
    • C.True wind velocity must be faster than the ship's speed
    • D.True wind must be from dead ahead
  4. The horse latitudes are characterized by ______.

    • A.weak pressure gradients and light,variable winds
    • B.the formation of typhoons or hurricanes in certain seasons
    • C.steady winds in one direction for six months followed by wind reversal for the next six months
    • D.steady winds generally from the southeast in the Southern Hemisphere
  5. The surface currents of the South Atlantic,South Pacific and South Indian Ocean follow,in general,a regular pattern of ______.

    • A.counter-clockwise circulation
    • B.clockwise circulation
    • C.trend from east to west
    • D.trend from north to south
  6. The general circulation of the surface water in Mediterranean is ______.

    • A.counter-clockwise
    • B.clockwise
    • C.from east to west
    • D.from north to south
  7. The“horse latitudes” regions of ______.

    • A.Brisk prevailing winds
    • B.Light airs and calms
    • C.Abundant blue sea grass vegetation
    • D.None of the above
  8. On the pole side of the trade wind belt,there is an area of high pressure with weak pressure gradients and light,variable winds.This area is called the ______.

    • A.Prevailing westerlies
    • B.Geostrophic winds
    • C.Doldrums
    • D.Horse latitudes
  9. In polar regions you should NOT expect to see ______.

    • A.Mirage effects
    • B.Sea smoke
    • C.Extensive snowfall
    • D.False horizons
  10. Gradient currents caused indirectly ______.

    • A.by the wind
    • B.by the wind or by density differences in adjacent areas
    • C.Coriolis force
    • D.by ships sailing in the oceans
  11. Which type of precipitation is a product of the violent convection found in thunderstorms ________.

    • A.Snow
    • B.Freezing Rain
    • C.Hail
    • D.Sleet
  12. A pattern that at the crest the motion of each particle is forward and at the trough it is backward relative to the wave's motion is ______.

    • A.a trochoid
    • B.a spheroid
    • C.a loxodrome
    • D.a carene
  13. Which of the following is not a wind ________.

    • A.Growler
    • B.Norther
    • C.Levanter
    • D.Mistral
  14. When experiencing heavy winds,you should reef sails to ______.

    • A.bring the sails parallel to the wind
    • B.reduce sail area exposed to the wind
    • C.allow the sails to catch more wind
    • D.remove all tension on the main and jib sheets
  15. What kind of pressure systems travel in easterly waves ________.

    • A.High pressure
    • B.Low pressure
    • C.Subsurface pressure
    • D.Terrastatic pressure
  16. When a hurricane passes over colder water or land and loses its tropical characteristics,the storm becomes a(n)______.

    • A.High pressure area
    • B.Extratropical low-pressure system
    • C.Tropical storm
    • D.Easterly wave
  17. When a hurricane passes into high latitudes over colder water and the source of heat is disrupted,the storm assumes the characteristics of ______.

    • A.a high pressure area
    • B.an extratropical cyclone
    • C.a tropical storm
    • D.an easterly wave
  18. Tropical cyclones are classified by form and intensity.Which system does not have closed isobars ________.

    • A.Hurricane
    • B.Tropical disturbance
    • C.Tropical depression
    • D.Cyclone
  19. What is the first visible indication of the presence of a tropical cyclone or hurricane ________.

    • A.Stratocumulus clouds or strange birds
    • B.Rain and increasing winds
    • C.An exceptionally long swell
    • D.Dark clouds and the“bar”of the storm
  20. The moisture equilibrium chart can be used to determine the ______.

    • A.Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium exists
    • B.Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodity
    • C.Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargo
    • D.Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo
  21. The direction of prevailing winds in the Northern hemisphere is caused by the ______.

    • A.Magnetic field at the North Pole
    • B.Gulf Stream
    • C.Earth's rotation
    • D.Arctic cold fronts
  22. The force resulting from the earth's rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called ______.

    • A.Pressure gradient
    • B.Coriolis effect
    • C.Aurora borealis
    • D.Ballistic deflection
  23. Haze is not caused by ______.

    • A.forest fires
    • B.smoke from industrial areas
    • C.dust or sand storms
    • D.water droplets with the relative humidity more than 95%
  24. Hurricanes may move in any direction.However,it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the ______.

    • A.West or northwest
    • B.Northeast
    • C.Southeast
    • D.North
  25. If you observe the point of cloud convergence shifting to the right and the “bar”of the storm appears to move along the horizon ______.

    • A.The center of the storm will by-pass you
    • B.The storm will strike you on the starboard side
    • C.You are in the direct path of the storm and should take immediate steps to batten down loose gear
    • D.The storm is starting to break up
  26. Cumulus clouds that have undergone vertical development and have become cumulonimbus in form,indicate ______.

    • A.clearing weather
    • B.that a warm front has passed
    • C.probable thunderstorm activity
    • D.an approaching hurricane or typhoon
  27. Clouds with the prefix“nimbo”in their name ______.

    • A.are sheet or layer clouds
    • B.have undergone great vertical development
    • C.are middle or high altitude clouds
    • D.are rain clouds
  28. A ______ is created by a pressure gradient or slope in the water level.

    • A.gradient current
    • B.density current
    • C.swift current
    • D.torrent current
  29. ______ is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.

    • A.MIXING FOG
    • B.ADVECTION FOG
    • C.RADIATION FOG
    • D.ARCTIC SEA SMOKE
  30. ______ are experienced in temperate latitudes during warm summer weather but rarely exceed Force 3 and may extend 10 to 15 miles on either side of the coastline.

    • A.Trade Winds
    • B.Winds of the temperate zones
    • C.Monsoons
    • D.Land and Sea Breezes
  31. ______ blow more or less constantly(except when monsoons prevail)throughout all seasons at a mean speed of around 14 knots and are generally strongest in the late winter.

    • A.Trade Winds
    • B.Winds of the temperate zones
    • C.Monsoons
    • D.Land and Sea Breezes
  32. ______ forms over land,most frequently during autumn and winter over low-lying land,especially if it is damp and marshy and in valleys on quiet nights with clear skies.

    • A.FRONTAL FOG
    • B.MIXING FOG
    • C.ADVECTION FOG
    • D.RADIATION FOG
  33. Which of the following statements concerning frontal movements is TRUE ________.

    • A.The temperature rises after a cold front passes
    • B.The barometric pressure rises when a warm front passes
    • C.A cold front generally passes faster than a warm front
    • D.A warm front usually has more violent weather associated with it than a cold front
  34. Widely spaced isobars on a weather map indicate ______.

    • A.High winds
    • B.Gentle breezes
    • C.Ice,snow or frozen rain
    • D.Probability of tornados
  35. When steering on autopilot which of the following input conditions may NOT have an effect on the control of the steering gear ________.

    • A.Non-follow-up
    • B.Rudder adjustment
    • C.Weather adjustment
    • D.All the above may be activated
  36. When a high pressure system is centered north of your vessel in the Northern Hemisphere ______.

    • A.You should experience hot,moist,clear weather
    • B.The wind direction is generally easterly
    • C.The winds should be from the southwest at your location
    • D.The winds should be brisk
  37. Which general weather conditions should you expect to find in a low pressure system ________.

    • A.Fair weather
    • B.Precipitation and cloudiness
    • C.Scattered clouds at high elevations
    • D.Gradual clearing and cooler temperatures
  38. West backing south-west gale 8 locally storm 10 ______ then rain or sleet mainly good.

    • A.windy showers
    • B.showers with winds
    • C.wintry showers
    • D.showery winds
  39. What benefit is a weather bulletin to a mariner ________.

    • A.It provides a legal reason to cancel a projected voyage
    • B.It allows the mariner to make long term weather forecasts
    • C.It is of little benefit since the weather changes frequently and rapidly
    • D.It gives the mariner time to prepare for weather changes
  40. Weather observations provided by each weather station include all of the following except ______.

    • A.temperature
    • B.visibility
    • C.predicted weather for the next twelve hours
    • D.barometric pressure and change in the last three hours
  41. Weather information is available from ______.

    • A.Commercial radio broadcasts
    • B.The Coast Guard on scheduled marine information broadcasts
    • C.VHF-FM continuous marine weather broadcasts provided by the National Weather Service
    • D.All of the above
  42. Weather conditions in the middle latitudes generally move ______.

    • A.Eastward
    • B.Westward
    • C.Northward
    • D.Southward
  43. The dense black cumulonimbus clouds surrounding the eye of a hurricane are called ______.

    • A.Spiral rainbands
    • B.Cloud walls
    • C.Funnel clouds
    • D.Cyclonic spirals
  44. The area of strong westerly winds occurring between 40°S and 60°S latitude is called the ______.

    • A.polar easterlies
    • B.prevailing westerlies
    • C.roaring forties
    • D.jet streams
  45. The apparent wind's speed can be zero,but only when two conditions are present.One condition is that the true wind ______.

    • A.Must be from dead ahead
    • B.Speed must be zero
    • C.Must be from dead astern
    • D.Must be on the beam
  46. TAIWAN STRAITS EAST GUANGDONG:CLOUDY TO OVERCAST WITH LOCAL SHOWERS WIND NE 22 TO 33 KTS SEAS ROUGH TO VERY ROUGH VIS 10 TO 20 KMS.The Vis. in this area is ______ nautical miles.

    • A.22 TO 33
    • B.11 TO 16
    • C.5 TO 10
    • D.10 TO 20
  47. HIGH WAVES;DENSE STREAKS OF FOAM ALONG THE DIRECTION OF THE WIND;CRESTS OF WAVES BEGIN TO TOPPLE,TUMBLE AND ROLL OVER;SPRAY MAY AFFECT VISIBILITY.This condition is likely to be termed ______.

    • A.Strong breeze
    • B.Near gale
    • C.Gale
    • D.Strong gale
  48. SCARBOROUGH= W TO SW UP TO 10 IN N.500 M IN HVY SQUALLY SHOWERS AND TS.SEA 7-8 M.SWELL SW 5-6 M.The visibility in this area is ______.

    • A.10 NM
    • B.500 M
    • C.7-8 M
    • D.5-6M
  49. Anticyclones are usually characterized by ______.

    • A.dry,fair weather
    • B.high winds and cloudiness
    • C.gustiness and continuous precipitation
    • D.overcast skies
  50. A type of precipitation that occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level is known as ______.

    • A.Sleet
    • B.Hail
    • C.Freezing rain
    • D.Rime
  51. A tropical storm is building strength some distance from your ship.Waves are coming from the east,with periods increasing from 5 seconds to 15 seconds.The swell is from the east.Where was the storm when these new swells were generated ________.

    • A.To the north of you
    • B.To the south of you
    • C.To the east of you
    • D.To the west of you
  52. A microbarograph is a precision instrument that provides a ______.

    • A.charted record of atmospheric temperature over time
    • B.charted record of atmospheric pressure over time
    • C.graphic record of combustible gases measured in an atmosphere
    • D.graphic record of vapor pressure from a flammable/combustible liquid
  53. ______ LOW ELY SLWLY WITH COLD FRONT FM CEN TO 12N 179W AND WARM FROM FM CEN TO 11N 171W.

    • A.SHLW
    • B.SCTD
    • C.OBS
    • D.SW