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CPL Test Series
Question Bank
Questions for TERRESTRIAL MAGNETISM
Answer the following questions
Test Mode
Training Mode
1. Soft iron is comparatively ....... to magnetise whilst hard iron is ....... to demagnetise
difficult; easy.
easy; easy.
easy; difficult.
difficult; difficult.
2. 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, dip.
the nearest pole, downwards, declination.
the nose of the aircraft, downwards, deviation
the north magnetic pole, downwards, variation.
3. 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 = Z tan dip
H = T sin dip
4. Which of the following materials are classed as ferromagnetic
nickel, iron, steel.
copper, iron, carbon steel.
iron, steel, carbon-fibre.
iron, cobalt steel, chromium steel.
5. The directive force of the earth's magnetic field
is greatest at the magnetic equator.
increases as magnetic latitude increases.
varies with the heading of the aircraft.
increases as the magnetic variation increases.
6. The magnetic moment of a magnet:
is the product of pole strength and effective length.
varies directly as the square of the distance between the poles.
varies inversely as the square of the distance between the poles
decreases as the magnet length increases.
7. 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
secular, westerly movement of the magnetic pole.
annual, westerly movement of the magnetic pole.
annual, sunspot activity.
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