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DGCA Air Navigation: Earth Magnetism & The Compass Questions

185 exam-style Earth Magnetism & The Compass questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.

  1. Q1

    When accelerating on an easterly heading in the Northern hemisphere, the compass card of a direct reading magnetic compass will turn?

    • AAnti-clockwise giving an apparent turn toward the south.
    • BClockwise giving an apparent turn toward the north.
    • CClockwise giving an apparent turn toward the south.
    • DAnti-clockwise giving an apparent turn toward the north.
    Show answer

    Correct answer: B. Clockwise giving an apparent turn toward the north.

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  2. Q2

    Sensitivity of a direct reading magnetic compass is?

    • Aproportional to the vertical component of the magnetic field of the earth.
    • Binversely proportlonal to the vertical and horizontal components of the magnetic field of the earth.
    • Cinversely proportional to horizontal component of the magnetic field of the earth.
    • Dproportional to horizontal component of the magnetic field of the earth.
    Show answer

    Correct answer: D. proportional to horizontal component of the magnetic field of the earth.

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  3. Q3

    When turning right from 320º(c) to 050º(C) In the Southern hemisphere, the reading of a direct reading magnetic compass will?

    • AOver-Indicate the turn and liquid swirl decrease the effect.
    • BUnder-indicate the turn and liquid swirl will decrease the effect.
    • COver-indicate the turn and liquid swirl will increase the effect
    • DUnder-indicate the turn and liquid swirl will increase the effect.
    Show answer

    Correct answer: A. Over-Indicate the turn and liquid swirl decrease the effect.

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  4. Q4

    An aircraft is completing a timed turn in the Northern hemisphere from 330ºC to 040ºC. After the turn has been stopped but before the direct indicating magnetic compass settles down, will the compass (1) over-read or under-read, and (2) is this error increased or decreased by liquid swirl?

    • A(1)over-read (2) increased
    • B(1) over-read (2) decreased.
    • C(1) under-read (2) increased
    • D(1) under-read (2) decreased
    Show answer

    Correct answer: C. (1) under-read (2) increased

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  5. Q5

    what is magnetic variation?

    • Athe angle between magnetic North and True North
    • Bthe angle between Magnetic Heading and Magnetic North.
    • Cthe angle between the direction indicated on the compass and Magnetic North.
    • Dthe angle between True North and Compass North.
    Show answer

    Correct answer: A. the angle between magnetic North and True North

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  6. Q6

    An aircraft in the northern hemisphere makes an accurate rate one turn to the right/starboard. If the initial heading was 330º, after 30 seconds of the turn the direct reading magnetic compass should read?

    • A060º
    • BMore than 060º
    • CMore or less than 060ºdepending on the pendulous suspension used.
    • DLess than 060º
    Show answer

    Correct answer: D. Less than 060º

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  7. Q7

    At the magnetic equator?

    • ADeviation is zero
    • BThe isogonal is an agonic line.
    • CDip is zero
    • DVariation is zero.
    Show answer

    Correct answer: C. Dip is zero

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  8. Q8

    Which of the following is the correct conversion from True to Compass?

    • ATrue north 130, Variation 2W Magnetic 128 Deviation -1 , Compass127
    • BTrue north 130, Variation 2E, Magnetic 128 ,Deviation -1 , Compass 127
    • CTrue north 130, Variation 2E, Magnetic 132, Deviation -1, Compass 133
    • DTrue north 130, Variation 2w, Magnetic 132, Deviation -1, Compass 133
    Show answer

    Correct answer: D. True north 130, Variation 2w, Magnetic 132, Deviation -1, Compass 133

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  9. Q9

    The horizontal component of the earth's magnetic field?

    • AWeakens with Increasing distance from the magnetic poles.
    • BWeakens with Increasing distance from the nearer magnetic pole.
    • CIs approximately the same at all magnetic latitudes less than 60º
    • DIs approximately the same at magnetic latitudes 50º N and 50ºS.
    Show answer

    Correct answer: D. Is approximately the same at magnetic latitudes 50º N and 50ºS.

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  10. Q10

    What is the maximum value of dip that can be caused by the vertical component of terrestrial magnetism?

    • A45º
    • B60º
    • C90º
    • D180º
    Show answer

    Correct answer: C. 90º

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  11. Q11

    Which of the following is correct when the variation is West?

    • ATrue North is East of Magnetic North.
    • BMagnetic North is West of Compass North
    • CTrue North is West of Magnetic North.
    • DCompass North is West of Magnetic North.
    Show answer

    Correct answer: A. True North is East of Magnetic North.

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  12. Q12

    A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an?

    • AAgonic line
    • BAclinic line.
    • CIsogonal
    • DIsotach
    Show answer

    Correct answer: A. Agonic line

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