Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Navigation (Set 36)
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Question 1 of 30
Which of the following is the most useful factor for predicting weather?
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30 MCQs #1 Which of the following is the most useful factor for predicting weather? #2 The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is __________. #3 Scales on aneroid barometers are usually graduated in inches of mercury in the general range of __________. #4 A barometric pressure reading of 29.92 inches of mercury is equivalent to __________. #5 A single barometric pressure reading of 28.60 indicates __________. #6 An instrument which maintains a continuous record of temperature changes is called a __________. #7 You should log all barometer readings taken at sea __________. #8 The instrument most commonly used to gather the data for determining the relative humidity is the __________. #9 A sling psychrometer is a(n) __________. #10 A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the __________. #11 A sling psychrometer is used to measure __________. #12 A warm air mass is characterized by __________. #13 Temperature and moisture characteristics are modified in a warm or cold air mass due to __________. #14 An air mass is termed "warm" if __________. #15 Air temperature varies with __________. #16 The process by which the temperature and/or moisture characteristics of an air mass changes is called __________. #17 Hot air can hold __________. #18 In North America the majority of the weather systems move from __________. #19 Which of the listed properties does warm air possess? #20 The apparent wind is zero when the true wind is __________. #21 The wind speed and direction observed from a moving vessel is known as __________. #22 A wind vane on a moving vessel shows __________. #23 The apparent wind's speed can be zero, but only when two conditions are present. One condition is that the true __________. #24 In most cases, the direction of the apparent wind lies between the bow and __________. #25 The velocity of the apparent wind can be less than the true wind and from the same direction, if certain conditions are present. One condition is that the __________. #26 According to Buys Ballot's Law, when an observer in the Southern Hemisphere experiences a northwest wind, the center of the low pressure is located to the __________. #27 You are steaming west in the South Atlantic in an extratropical cyclonic storm, and the wind is dead ahead. According to the law of Buys Ballot, the center of low pressure lies __________. #28 According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northeast wind the center of low pressure is located to the __________. #29 If an observer in the Northern Hemisphere faces the surface wind, the center of low pressure is to his _________. #30 If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?
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