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