Nav 1 Prelim (80 Items)

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Nav 1 Prelim (80 Items) - Quiz

Questions and Answers
  • 1. 

    Navigation in which the position of the ship is determined from the direction and amount of progress from the last known position is called.

    • A.

      Piloting

    • B.

      Dead reckoning

    • C.

      Electronic navigation

    • D.

      Celestial navigation

    Correct Answer
    B. Dead reckoning
    Explanation
    Dead reckoning is a method of navigation where the position of a ship is determined by calculating its direction and distance traveled from its last known position. This method does not rely on external aids such as landmarks or celestial bodies. Instead, it uses the ship's speed, course, and time to estimate its current position. Dead reckoning is commonly used when other forms of navigation, such as celestial navigation or electronic navigation, are not available or unreliable. Piloting, electronic navigation, and celestial navigation all involve different methods of determining a ship's position.

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  • 2. 

    Navigation in which the position of the ship is determined from the direction and amount of progress from the last known position is called.

    • A.

      Piloting

    • B.

      Dead reckoning

    • C.

      Electronic navigation

    • D.

      Celestial navigation

    Correct Answer
    B. Dead reckoning
    Explanation
    Dead reckoning is a method of navigation where the position of a ship is estimated based on the direction and distance traveled since the last known position. It involves using a combination of speed, time, and course to calculate the current position. This method is often used when other forms of navigation, such as celestial or electronic navigation, are not available or reliable. Piloting involves using visual landmarks and charts to navigate, electronic navigation relies on GPS and other electronic devices, while celestial navigation uses celestial bodies to determine position.

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  • 3. 

    The method of determining the ship's position by the aid of celestial observation of celestial bodies using a sextant is called

    • A.

      Piloting

    • B.

      Dead reckoning

    • C.

      Electronic navigation

    • D.

      Celestial navigation

    Correct Answer
    D. Celestial navigation
    Explanation
    Celestial navigation is the method of determining a ship's position by observing celestial bodies, such as the sun, moon, stars, and planets, using a sextant. This technique involves measuring the angle between the celestial body and the horizon, and then using mathematical calculations to determine the ship's latitude and longitude. Celestial navigation has been used for centuries and is still used today as a backup to electronic navigation systems.

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  • 4. 

    The method of determining the ship's position by the aid of celestial observation of celestial bodies using a sextant is called

    • A.

      Piloting

    • B.

      Dead reckoning

    • C.

      Electronic navigation

    • D.

      Celestial navigation

    Correct Answer
    D. Celestial navigation
    Explanation
    Celestial navigation is the method of determining a ship's position by observing celestial bodies using a sextant. This involves measuring the angle between the horizon and a celestial body, such as the sun, moon, or stars, and using reference tables and mathematical calculations to determine the ship's latitude and longitude. Celestial navigation has been used for centuries and is still used today as a backup to electronic navigation systems. Piloting, dead reckoning, and electronic navigation are other methods of determining a ship's position, but they do not involve the observation of celestial bodies.

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  • 5. 

    Which of the following is the angle of inclination of the earth

    • A.

      23 degrees 27 minutes north or south

    • B.

      23 degrees 37 minutes east or west

    • C.

      27 degrees 23 minutes north or south

    • D.

      27 degrees 23 minutes east or west

    Correct Answer
    A. 23 degrees 27 minutes north or south
    Explanation
    The angle of inclination of the Earth refers to the tilt of the Earth's axis in relation to its orbit around the Sun. This tilt is approximately 23 degrees and 27 minutes, either north or south of the equator. This angle is responsible for the changing seasons and the variation in daylight hours throughout the year.

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  • 6. 

    Which of the following is the angle of inclination of the earth

    • A.

      23 degrees 27 minutes north or south

    • B.

      23 degrees 37 minutes east or west

    • C.

      27 degrees 23 minutes north or south

    • D.

      27 degrees 23 minutes east or west

    Correct Answer
    A. 23 degrees 27 minutes north or south
    Explanation
    The angle of inclination of the Earth refers to the tilt of the Earth's axis in relation to its orbit around the Sun. This tilt is approximately 23 degrees and 27 minutes, either north or south of the equator. This angle of inclination is what causes the changing seasons and the variation in daylight hours throughout the year.

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  • 7. 

    A semi great circle on the earth's surface, which runs between the two geogaphical poles, and passes throught an arbitrary point in greenwich is called

    • A.

      Meridian

    • B.

      Prime meridian

    • C.

      Both a and b

    • D.

      Neither a nor b

    Correct Answer
    B. Prime meridian
    Explanation
    The prime meridian is a semi great circle on the earth's surface that runs between the two geographical poles and passes through an arbitrary point in Greenwich. It is a line of longitude that serves as a reference point for determining longitude around the world. The prime meridian is significant because it divides the earth into the Eastern Hemisphere and the Western Hemisphere, and it is used as the starting point for measuring longitude. Therefore, the correct answer is prime meridian.

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  • 8. 

    A semi great circle on the earth's surface, which runs between the two geogaphical poles, and passes throught an arbitrary point in greenwich is called

    • A.

      Meridian

    • B.

      Prime meridian

    • C.

      Both a and b

    • D.

      Neither a nor b

    Correct Answer
    B. Prime meridian
    Explanation
    The prime meridian is a semi great circle on the earth's surface that runs between the two geographical poles and passes through an arbitrary point in Greenwich. It is the starting point for measuring longitude and divides the earth into the Eastern Hemisphere and the Western Hemisphere.

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  • 9. 

    An essential form of piloting with the aid of electronic equipments with a high range of accuracy is called

    • A.

      Piloting

    • B.

      Dead reckoning

    • C.

      Electronic navigation

    • D.

      Celestial navigation

    Correct Answer
    C. Electronic navigation
    Explanation
    Electronic navigation is an essential form of piloting that utilizes electronic equipment to accurately navigate. It provides a high range of accuracy compared to other methods such as dead reckoning or celestial navigation. This form of navigation relies on electronic devices such as GPS systems, radar, and sonar to determine the position, course, and speed of a vessel or aircraft. It is widely used in modern aviation and maritime industries due to its reliability and precision in determining location and navigating safely.

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  • 10. 

    An essential form of piloting with the aid of electronic equipments with a high range of accuracy is called

    • A.

      Piloting

    • B.

      Dead reckoning

    • C.

      Electronic navigation

    • D.

      Celestial navigation

    Correct Answer
    C. Electronic navigation
    Explanation
    Electronic navigation refers to the use of electronic equipment to aid in piloting. This form of navigation is essential because it provides a high range of accuracy. It allows pilots to determine their position, track their course, and avoid obstacles using electronic devices such as GPS, radar, and sonar. This technology greatly enhances the safety and efficiency of navigation, especially in situations where visual or traditional methods may be limited or unreliable.

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  • 11. 

    The angular distance of any point north or south of the equator is called

    • A.

      Latitude

    • B.

      Longitude

    • C.

      Meridian

    • D.

      Both a and b

    Correct Answer
    A. Latitude
    Explanation
    Latitude is the angular distance of any point north or south of the equator. It is measured in degrees and ranges from 0° at the equator to 90° at the North and South poles. Longitude, on the other hand, is the angular distance of any point east or west of the Prime Meridian. Therefore, the correct answer is latitude.

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  • 12. 

    The angular distance of any point north or south of the equator is called

    • A.

      Latitude

    • B.

      Longitude

    • C.

      Meridian

    • D.

      Both a and b

    Correct Answer
    A. Latitude
    Explanation
    Latitude refers to the angular distance of any point north or south of the equator. It is measured in degrees and ranges from 0° at the equator to 90° at the poles. Longitude, on the other hand, refers to the angular distance of any point east or west of the prime meridian. Therefore, the correct answer is latitude because it specifically relates to the distance north or south of the equator.

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  • 13. 

    A circle that passes through the center of the sphere and cuts the sphere exactly in half is called

    • A.

      Small circle

    • B.

      Great circle

    • C.

      Meridian

    • D.

      Star circle

    Correct Answer
    B. Great circle
    Explanation
    A great circle is a circle that passes through the center of a sphere and divides it into two equal halves. It is the largest possible circle that can be drawn on a sphere. The term "great" refers to its size, not its quality. Great circles are important in navigation and are used as reference lines for measuring distances on the Earth's surface.

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  • 14. 

    A circle that passes through the center of the sphere and cuts the sphere exactly in half is called

    • A.

      Small circle

    • B.

      Great circle

    • C.

      Meridian

    • D.

      Star circle

    Correct Answer
    B. Great circle
    Explanation
    A great circle is a circle that passes through the center of a sphere and cuts the sphere exactly in half. It is called a great circle because it has the largest possible circumference for a given sphere. Great circles are important in navigation and mapping as they represent the shortest distance between two points on the sphere's surface. They are also used in aviation for flight planning and determining the shortest route between two locations on the Earth's surface.

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  • 15. 

    All of these are obsevable celestial bodies except

    • A.

      Sun

    • B.

      Rocks

    • C.

      Stars

    • D.

      Planets

    Correct Answer
    B. Rocks
  • 16. 

    All of these are obsevable celestial bodies except

    • A.

      Sun

    • B.

      Rocks

    • C.

      Stars

    • D.

      Planets

    Correct Answer
    B. Rocks
    Explanation
    The sun, stars, and planets are all observable celestial bodies because they emit or reflect light that can be seen from Earth. Rocks, on the other hand, are not considered observable celestial bodies as they are not part of the celestial realm and are typically found on Earth's surface.

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  • 17. 

    What bearing is relative to true north

    • A.

      Compass bearing

    • B.

      True bearing

    • C.

      Magnetic bearing

    • D.

      Relative bearing

    Correct Answer
    B. True bearing
    Explanation
    True bearing refers to the angle between a point of interest and true north. It is the direction measured in degrees clockwise from true north. Unlike magnetic bearing, which is affected by the Earth's magnetic field, true bearing is not influenced by magnetic variations and provides a more accurate representation of direction. Relative bearing, on the other hand, refers to the angle between a point of interest and the direction the observer is facing. Therefore, true bearing is the most appropriate term for describing the bearing relative to true north.

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  • 18. 

    What bearing is relative to true north

    • A.

      Compass bearing

    • B.

      True bearing

    • C.

      Magnetic bearing

    • D.

      Relative bearing

    Correct Answer
    B. True bearing
    Explanation
    True bearing refers to the angle between a specific direction and true north. It is not affected by magnetic variations or any other factors. Unlike magnetic bearing, which is based on the Earth's magnetic field, true bearing is a fixed reference point that remains constant. Relative bearing, on the other hand, is the angle between the forward direction of an object and the direction of the observer. Therefore, true bearing is the most accurate and reliable measure of direction in relation to true north.

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  • 19. 

    What is the circumfeence of the earth at the poles in miles

    • A.

      21,550 miles

    • B.

      21,554 miles

    • C.

      21,620 miles

    • D.

      21,626 miles

    Correct Answer
    B. 21,554 miles
    Explanation
    The circumference of the Earth at the poles is 21,554 miles.

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  • 20. 

    What is the circumfeence of the earth at the poles in miles

    • A.

      21,550 miles

    • B.

      21,554 miles

    • C.

      21,620 miles

    • D.

      21,626 miles

    Correct Answer
    B. 21,554 miles
    Explanation
    The circumference of the Earth at the poles is 21,554 miles. This means that if you were to travel around the Earth at the poles, you would cover a distance of 21,554 miles.

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  • 21. 

    Which of the following is the diameter of the earth at the equator in miles

    • A.

      6,860 miles

    • B.

      6,861 miles

    • C.

      6,880 miles

    • D.

      6,884 miles

    Correct Answer
    D. 6,884 miles
    Explanation
    The correct answer is 6,884 miles. This is the measurement of the diameter of the Earth at the equator in miles.

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  • 22. 

    Which of the following is the diameter of the earth at the equator in miles

    • A.

      6,860 miles

    • B.

      6,861 miles

    • C.

      6,880 miles

    • D.

      6,884 miles

    Correct Answer
    D. 6,884 miles
    Explanation
    The correct answer is 6,884 miles. This is the diameter of the Earth at the equator in miles.

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  • 23. 

    What is the equivalent of 1 statute mile in feet

    • A.

      5,280 feet

    • B.

      5,276 feet

    • C.

      6,076 feet

    • D.

      6,676 feet

    Correct Answer
    A. 5,280 feet
    Explanation
    One statute mile is equivalent to 5,280 feet.

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  • 24. 

    What is the equivalent of 1 statute mile in feet

    • A.

      5,280 feet

    • B.

      5,276 feet

    • C.

      6,076 feet

    • D.

      6,676 feet

    Correct Answer
    A. 5,280 feet
    Explanation
    One statute mile is equal to 5,280 feet.

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  • 25. 

    What bearing is relative to compass north

    • A.

      Compass bearing

    • B.

      True bearing

    • C.

      Magnetic bearing

    • D.

      Relative bearing

    Correct Answer
    A. Compass bearing
    Explanation
    Compass bearing refers to the direction of an object or location in relation to the north point on a compass. It is the angle measured in degrees clockwise from the north direction. So, when we say "bearing is relative to compass north," it means that the bearing is determined based on the reference point of the north on a compass.

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  • 26. 

    What bearing is relative to compass north

    • A.

      Compass bearing

    • B.

      True bearing

    • C.

      Magnetic bearing

    • D.

      Relative bearing

    Correct Answer
    A. Compass bearing
    Explanation
    Compass bearing refers to the direction of an object or location in relation to the north direction indicated by a compass. It is a measurement of the angle between the north direction and the direction of the object or location. Therefore, compass bearing is relative to compass north, as it is based on the reference point provided by the compass.

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  • 27. 

    What is called to bearing that is measured from the ship's bow from  degrees to 180 degrees port or starboard

    • A.

      Compass bearing

    • B.

      True bearing

    • C.

      Magnetic bearing

    • D.

      Relative bearing

    Correct Answer
    D. Relative bearing
    Explanation
    Relative bearing is the correct answer because it refers to the bearing that is measured from the ship's bow, ranging from 0 degrees to 180 degrees port or starboard. This type of bearing is relative to the ship's heading and is used to describe the direction of an object or target in relation to the ship. It is commonly used in navigation and maritime operations to communicate the position and direction of other vessels or objects.

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  • 28. 

    What is called to bearing that is measured from the ship's bow from  degrees to 180 degrees port or starboard

    • A.

      Compass bearing

    • B.

      True bearing

    • C.

      Magnetic bearing

    • D.

      Relative bearing

    Correct Answer
    D. Relative bearing
    Explanation
    A relative bearing is the bearing of an object or point measured from the ship's bow in degrees, ranging from 0 degrees (directly ahead) to 180 degrees (directly astern), either to the port (left) or starboard (right) side of the ship. It is called a relative bearing because it is relative to the ship's heading or direction of travel. This type of bearing is commonly used in navigation to determine the position and direction of other objects or vessels in relation to the ship.

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  • 29. 

    What type of time is considered as the standard time of the sea

    • A.

      Local mean time (LMT)

    • B.

      Greenwich mean time (GMT)

    • C.

      Zone time (ZT)

    • D.

      Daily savings time (DST)

    Correct Answer
    C. Zone time (ZT)
    Explanation
    Zone time (ZT) is considered as the standard time of the sea. Zone time refers to the time standard used within a specific geographic region or time zone. It is based on the local mean time (LMT) of a designated meridian within the time zone. Greenwich Mean Time (GMT) is a time standard used internationally, but it is not specifically associated with the sea. Daily savings time (DST) is a practice of adjusting the clocks forward during certain periods of the year to extend daylight, but it is not considered as the standard time of the sea.

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  • 30. 

    What type of time is considered as the standard time of the sea

    • A.

      Local mean time (LMT)

    • B.

      Greenwich mean time (GMT)

    • C.

      Zone time (ZT)

    • D.

      Daily savings time (DST)

    Correct Answer
    C. Zone time (ZT)
    Explanation
    Zone time (ZT) is considered as the standard time of the sea. This is because zone time is based on dividing the Earth into different time zones, each approximately 15 degrees of longitude wide. Each time zone has a standard time that is used as a reference for that particular region. As ships travel across different time zones, they adjust their clocks to the local zone time to ensure consistency and coordination with other ships and ports in the area. Therefore, zone time is the preferred standard time for sea navigation.

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  • 31. 

    What part of a compass is composed of light magnetic material graduated in points

    • A.

      Compass card

    • B.

      Lubber's line

    • C.

      Gimbals

    • D.

      Binnacle

    Correct Answer
    A. Compass card
    Explanation
    The part of a compass that is composed of light magnetic material graduated in points is called a compass card. This card is marked with the cardinal points (North, South, East, and West) as well as the intermediate points. It is used to determine the direction in which the compass is pointing.

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  • 32. 

    What part of a compass is composed of light magnetic material graduated in points

    • A.

      Compass card

    • B.

      Lubber's line

    • C.

      Gimbals

    • D.

      Binnacle

    Correct Answer
    A. Compass card
    Explanation
    The compass card is composed of light magnetic material and is graduated in points. It is the part of the compass that rotates freely and indicates the direction of magnetic north. The compass card is marked with the cardinal points (north, south, east, and west) as well as the intermediate points (northeast, southwest, etc.), allowing the user to determine their direction accurately.

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  • 33. 

    What part of a compass is placed to represents the bow of the ship

    • A.

      Compass card

    • B.

      Lubber's line

    • C.

      Gimbals

    • D.

      Binnacle

    Correct Answer
    B. Lubber's line
    Explanation
    The lubber's line is a part of a compass that is placed to represent the bow of the ship. It is a fixed line or mark on the compass card that indicates the direction the ship is facing. By aligning the lubber's line with the desired direction, sailors can accurately navigate their vessel.

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  • 34. 

    What part of a compass is placed to represents the bow of the ship

    • A.

      Compass card

    • B.

      Lubber's line

    • C.

      Gimbals

    • D.

      Binnacle

    Correct Answer
    B. Lubber's line
    Explanation
    The lubber's line is a part of a compass that is placed to represent the bow of the ship. It is a fixed line or mark on the compass that helps the navigator or helmsman align the compass with the ship's heading. By aligning the lubber's line with the bow of the ship, the navigator can accurately read the compass and determine the ship's direction.

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  • 35. 

    What type of time uses the mean sun as the celestial reference point

    • A.

      Local mean time (LMT)

    • B.

      Greenwich mean time (GMT)

    • C.

      Zone time (ZT)

    • D.

      Daily savings time (DST)

    Correct Answer
    A. Local mean time (LMT)
    Explanation
    The mean sun is a theoretical sun that moves at a constant rate, taking into account the Earth's elliptical orbit. Local mean time (LMT) uses the mean sun as the celestial reference point, meaning that it is based on the position of the mean sun in relation to a specific location. This type of time provides a consistent and standardized measure of time for a particular location, regardless of variations caused by the Earth's orbit. Greenwich Mean Time (GMT) is also based on the mean sun, but it is specifically tied to the longitude of the Greenwich meridian. Zone time (ZT) refers to the time used within a specific time zone, while daylight savings time (DST) is a practice of adjusting the clocks to extend evening daylight during certain periods of the year.

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  • 36. 

    What type of time uses the mean sun as the celestial reference point

    • A.

      Local mean time (LMT)

    • B.

      Greenwich mean time (GMT)

    • C.

      Zone time (ZT)

    • D.

      Daily savings time (DST)

    Correct Answer
    A. Local mean time (LMT)
    Explanation
    The mean sun is a theoretical sun that moves at a constant rate and represents the average motion of the real sun throughout the year. Local mean time (LMT) is a type of time that uses the mean sun as the celestial reference point. It is based on the rotation of the Earth and is adjusted to account for the Earth's elliptical orbit around the sun. LMT is used to standardize time within a specific region or locality, taking into account the variations caused by the Earth's rotation and orbit.

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  • 37. 

    Large scale charts used in local navigation and anchorage in harbors and smaller water ways, where the scale is less than 1:50,000 is called

    • A.

      Sailing chart

    • B.

      General chart

    • C.

      Coast chart

    • D.

      Harbor chart

    Correct Answer
    D. Harbor chart
    Explanation
    A harbor chart is a large scale chart that is specifically used for local navigation and anchorage in harbors and smaller waterways. It is designed to provide detailed and accurate information about the specific features and characteristics of a particular harbor, including its channels, depths, buoys, and other navigational aids. The scale of a harbor chart is typically less than 1:50,000, which means that it provides a larger and more detailed view of the area compared to other types of charts. This allows sailors and navigators to safely navigate and maneuver their vessels within the harbor.

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  • 38. 

    Large scale charts used in local navigation and anchorage in harbors and smaller water ways, where the scale is less than 1:50,000 is called

    • A.

      Sailing chart

    • B.

      General chart

    • C.

      Coast chart

    • D.

      Harbor chart

    Correct Answer
    D. Harbor chart
    Explanation
    A harbor chart is a large scale chart used for local navigation and anchorage in harbors and smaller waterways. It provides detailed information about the harbor, including depths, navigational aids, and potential hazards. The scale of a harbor chart is typically less than 1:50,000, which means that it provides a close-up view of the area, allowing for precise navigation and safe anchoring.

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  • 39. 

    A conformal cylindrical map projection in which the surface of the sphere such as the earth is conceived as developed on a cylinder is called

    • A.

      Mercator projection

    • B.

      Polyconic projection

    • C.

      Gnomonic projection

    • D.

      Lambert projection

    Correct Answer
    A. Mercator projection
    Explanation
    A conformal cylindrical map projection, such as the Mercator projection, is created by imagining the surface of a sphere, such as the Earth, being developed onto a cylinder. This projection preserves angles and shapes accurately, making it useful for navigation purposes. The Mercator projection is commonly used for world maps and navigational charts because it accurately represents the shape of landmasses, but it distorts the size of objects as they get further away from the equator.

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  • 40. 

    A conformal cylindrical map projection in which the surface of the sphere such as the earth is conceived as developed on a cylinder is called

    • A.

      Mercator projection

    • B.

      Polyconic projection

    • C.

      Gnomonic projection

    • D.

      Lambert projection

    Correct Answer
    A. Mercator projection
    Explanation
    A conformal cylindrical map projection in which the surface of the sphere, such as the earth, is conceived as developed on a cylinder is known as the Mercator projection. This projection preserves the shapes of small areas, making it useful for navigation and representing the entire world on a flat surface. However, it distorts the size and scale of objects as they move away from the equator, resulting in significant distortion in high-latitude regions.

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  • 41. 

    Charts mostly on a scale of approximate 1:600,000 to 1:1,200,000 that shows the approaches to a large extent of coast is called

    • A.

      Sailing chart

    • B.

      General chart

    • C.

      Coast chart

    • D.

      Harbor chart

    Correct Answer
    A. Sailing chart
    Explanation
    A sailing chart is a type of chart that typically shows the approaches to a large extent of coast on a scale of approximately 1:600,000 to 1:1,200,000. It is specifically designed for sailors and provides detailed information about the coastlines, navigational aids, and hazards in the area. Sailing charts are essential for planning and executing safe and efficient sailing routes.

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  • 42. 

    Charts mostly on a scale of approximate 1:600,000 to 1:1,200,000 that shows the approaches to a large extent of coast is called

    • A.

      Sailing chart

    • B.

      General chart

    • C.

      Coast chart

    • D.

      Harbor chart

    Correct Answer
    A. Sailing chart
    Explanation
    A sailing chart is a type of chart that typically shows the approaches to a large extent of coast on a scale of approximately 1:600,000 to 1:1,200,000. It is specifically designed for sailors and provides detailed information about the coastlines, navigational hazards, depths, and other important features relevant to sailing. This type of chart helps sailors plan their routes and navigate safely along the coast.

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  • 43. 

    A map projection use for a chart is called

    • A.

      Chart datum

    • B.

      Chart projection

    • C.

      Chart reading

    • D.

      Chart compass

    Correct Answer
    B. Chart projection
    Explanation
    A map projection is a method used to represent the curved surface of the Earth on a flat chart. It allows for accurate measurements and calculations on the chart. Therefore, when referring to a map projection specifically used for a chart, it is called a chart projection. This term distinguishes it from other types of map projections that may be used for different purposes.

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  • 44. 

    A map projection use for a chart is called

    • A.

      Chart datum

    • B.

      Chart projection

    • C.

      Chart reading

    • D.

      Chart compass

    Correct Answer
    B. Chart projection
    Explanation
    A chart projection refers to the method used to represent the curved surface of the Earth on a flat chart. It involves transforming the spherical shape of the Earth onto a two-dimensional surface, such as a paper chart. This allows for accurate representation of geographic features, distances, and directions on the chart. Therefore, a map projection used for a chart is called a chart projection.

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  • 45. 

    A chart giving information on ocean currents, weather and other information for safe navigation is called

    • A.

      Sailing chart

    • B.

      Pilot chart

    • C.

      General chart

    • D.

      Coast chart

    Correct Answer
    B. Pilot chart
    Explanation
    A pilot chart is a chart that provides information on ocean currents, weather patterns, and other essential information for safe navigation. It is specifically designed for sailors and pilots to plan their routes and avoid potential hazards. This type of chart is widely used in maritime navigation to ensure the safety and efficiency of voyages.

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  • 46. 

    A chart giving information on ocean currents, weather and other information for safe navigation is called

    • A.

      Sailing chart

    • B.

      Pilot chart

    • C.

      General chart

    • D.

      Coast chart

    Correct Answer
    B. Pilot chart
    Explanation
    A pilot chart is a chart that provides information on ocean currents, weather patterns, and other relevant information for safe navigation. It is specifically designed to assist sailors and pilots in planning routes and avoiding potential hazards. This type of chart is commonly used for long-distance voyages and is an essential tool for maritime navigation.

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  • 47. 

    Weekly publications containing information of changes which require correction of existing charts and books of sailing directions is called

    • A.

      Chart catalogue

    • B.

      Chart compass

    • C.

      Chart projection

    • D.

      Notice to mariners

    Correct Answer
    D. Notice to mariners
    Explanation
    A notice to mariners is a weekly publication that provides information about changes that need to be made to existing charts and books of sailing directions. It serves as a way to keep sailors and navigators updated on any corrections or updates that are necessary for safe navigation.

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  • 48. 

    Weekly publications containing information of changes which require correction of existing charts and books of sailing directions is called

    • A.

      Chart catalogue

    • B.

      Chart compass

    • C.

      Chart projection

    • D.

      Notice to mariners

    Correct Answer
    D. Notice to mariners
    Explanation
    A notice to mariners is a weekly publication that provides information about changes that need to be made to existing charts and books of sailing directions. It is used by sailors and navigators to stay updated with the latest information regarding navigational hazards, changes in buoy positions, and other important updates that may affect their voyage. This helps ensure the safety and accuracy of navigation by providing the necessary corrections to existing charts and publications.

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  • 49. 

    An avoidable extension of charted areas due to impossibility of accurately reproducing a spherical surface on a plane surface is called

    • A.

      Chart border

    • B.

      Chart projection

    • C.

      Chart reading

    • D.

      Chart distortion

    Correct Answer
    D. Chart distortion
    Explanation
    Chart distortion refers to the unavoidable extension of charted areas when trying to accurately represent a spherical surface on a flat plane. This distortion occurs because it is impossible to perfectly reproduce the curved surface of the Earth on a two-dimensional chart. As a result, the charted areas may appear stretched or compressed, leading to inaccuracies in measurements and representations of geographic features.

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  • 50. 

    An avoidable extension of charted areas due to impossibility of accurately reproducing a spherical surface on a plane surface is called

    • A.

      Chart border

    • B.

      Chart projection

    • C.

      Chart reading

    • D.

      Chart distortion

    Correct Answer
    D. Chart distortion
    Explanation
    Chart distortion refers to the unavoidable extension of charted areas caused by the difficulty of accurately representing a spherical surface on a flat plane. When creating charts or maps, it is challenging to accurately depict the curvature of the Earth, resulting in distortions in the representation of landmasses, distances, and shapes. This distortion is a common issue and can affect the accuracy of navigation and other geographical calculations.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 14, 2011
    Quiz Created by
    Torah_tesay
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