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CPL Test Series
Question Bank
Questions for TERRESTRIAL MAGNETISM
Answer the following questions
Test Mode
Training Mode
1. The directive force of the earth's magnetic field
varies with the heading of the aircraft.
increases as magnetic latitude increases.
is greatest at the magnetic equator.
increases as the magnetic variation increases.
2. Which of the following materials are classed as ferromagnetic
copper, iron, carbon steel.
iron, cobalt steel, chromium steel.
iron, steel, carbon-fibre.
nickel, iron, steel.
3. The magnetic moment of a magnet:
decreases as the magnet length increases.
varies inversely as the square of the distance between the poles
is the product of pole strength and effective length.
varies directly as the square of the distance between the poles.
4. The slow change in the earth's magnetic variation is known as the ....... change and is caused by .......
diurnal, easterly movement of the magnetic pole
annual, sunspot activity.
annual, westerly movement of the magnetic pole.
secular, westerly movement of the magnetic pole.
5. Soft iron is comparatively ....... to magnetise whilst hard iron is ....... to demagnetise
easy; difficult.
easy; easy.
difficult; difficult.
difficult; easy.
6. If the total force of the earth's field at a point is T and the horizontal and vertical components H and Z, the value of H is found by the formula
H = T tan dip
H = T cos dip
H = T sin dip
H = Z tan dip
7. The red pole of a freely suspended magnet will point towards ....... and at latitude 60°N will point ....... at an angle known as the angle of .......
the north magnetic pole, downwards, variation.
the north magnetic pole, downwards, dip.
the nearest pole, downwards, declination.
the nose of the aircraft, downwards, deviation
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