Quick recall · 27 cards
Short MCQ-style retrieval prompts. Tap a card to reveal the answer.
PYQ
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The polar diameter of the earth is how much different to the equatorial diameter?
D · less by 40 km
PYQ · 2019
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The diameter of the Earth is approximately:
A · 12700 km
PYQ
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The circumference of the Earth along the Equator is approximately
A · 40,075 km
Standard equatorial circumference of Earth = 40,075 km (WGS-84 ellipsoid).1 NM = 1.852 km, so 21,600 NM × 1.852 ≈ 40,000 km (approximate, not exact).Exact value is 40,075 km. Option A is correct.
PYQ
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Which points on the Earth's surface determine the Earth's axis?
A · North and south geographic pole
PYQ
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What is the latitude of a point on the Equator?
A · 0°
Latitude measures angular distance north or south of the Equator (0°). At the Equator, latitude = 0° by definition.Option A is correct.
PYQ
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One Degree of latitude is equal to:
A · 60nms
PYQ
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On a Mercator chart the length of one minute of longitude at a certain latitude is represented by:
A · A longitude x cos (mean latitude)
PYQ
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An aircraft flies a great circle track from 56° N 070° W to 62° N 110° E. The total distance travelled is?
A · 3720 NM
PYQ
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Given: A is N55° 000°, B is N54° E010°. The average true course of the great circle is 100°. The true course of the rhumb line at point A is:
B · 096°
PYQ
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In order to fly from position A (10°00'N, 030°00'W) to position B (30°00'N, 050°00'W), maintaining a constant true course, it is necessary to fly:
A · a rhumb line track
PYQ
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Any Meridian Line is a:
C · Rhumb Line and a semi Great Circle
PYQ
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A Rhumb Line cuts all meridians at the same angle. This gives:
C · A line of constant direction
PYQ
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The angle between the true great-circle track and the true rhumb-line track joining the following points: A (60° S 165°W) B (60° S 177° E), at the place of departure A, is:
A · 9°
Question bank
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Which of the following best describes the geometric shape of the Earth?
B · Oblate spheroid
The Earth is best approximated as an oblate spheroid due to its equatorial bulge caused by rotation.
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The flattening of the Earth is primarily caused by:
B · Earth's rotation
The Earth's rotation causes centrifugal force, leading to flattening at the poles and bulging at the equator.
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Refer to the diagram below showing an ellipsoid representing Earth. Which axis represents the semi-major axis?
B · Equatorial axis
The semi-major axis corresponds to the equatorial radius, which is larger than the polar radius.
Question bank
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Which of the following is closest to the average equatorial radius of the Earth?
B · 6378 km
The average equatorial radius of the Earth is approximately 6378 km.
Question bank
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Given the Earth's flattening factor \( f = \frac{1}{298.257} \), what does this value represent?
B · Difference between equatorial and polar radii divided by equatorial radius
Flattening \( f = \frac{a - b}{a} \), where \( a \) is equatorial radius and \( b \) is polar radius.
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Which geodesy method involves measuring the Earth's shape using satellite signals?
C · GNSS (Global Navigation Satellite System)
GNSS uses satellite signals to determine precise positions and Earth's shape.
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Which of the following best defines a great circle on the Earth's surface?
A · A circle that divides the Earth into two equal hemispheres
A great circle is any circle drawn on a sphere (Earth) that divides it into two equal halves, such as the Equator or any meridian.
Question bank
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Which property is true for all rhumb lines on the Earth?
B · They cross all meridians at the same angle
Rhumb lines (loxodromes) cross all meridians at a constant angle, which is why they represent constant bearing paths.
Question bank
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Which of the following statements correctly compares great circles and rhumb lines?
C · Great circles represent the shortest distance, rhumb lines maintain constant bearing
Great circles represent the shortest distance between two points on a sphere, while rhumb lines maintain a constant compass bearing but are generally longer.
Question bank
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Refer to the diagram below showing a great circle route between points A and B on a spherical Earth. Which of the following is true about this route?
C · It represents the shortest distance between A and B
Great circle routes represent the shortest distance between two points on the surface of a sphere.
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Which of the following is a key disadvantage of using rhumb line routes in air navigation compared to great circle routes?
B · They are longer in distance than great circle routes
Rhumb line routes maintain a constant compass bearing but are generally longer than great circle routes, which represent the shortest distance.
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Which statement correctly describes the relationship between constant bearing navigation and rhumb lines?
B · Rhumb lines correspond to constant bearing navigation
Rhumb lines are paths of constant compass bearing, making them suitable for constant bearing navigation.
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Refer to the diagram below showing a rhumb line and a great circle route between two points on the globe. Which route will generally require fewer course adjustments during flight?
B · Rhumb line route
Rhumb line routes maintain a constant compass bearing, so they require fewer course adjustments compared to great circle routes which change bearing along the path.
Question bank
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Which of the following is true about the shortest distance between two points on the Earth’s surface?
B · It is represented by a segment of a great circle
The shortest distance between two points on a sphere is along the great circle connecting them.
