TERRESTRIAL MAGNETISM – Air – DGCA Question Bank For Politics

#1. 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 nose of the aircraft, downwards, deviation

the north magnetic pole, downwards, variation.

the nearest pole, downwards, declination.

the north magnetic pole, downwards, dip.

#2. 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 sin dip

H = Z tan dip

H = T cos dip

H = T tan dip

#3. In the diagram below, the compass heading of the aircraft is ......., the magnetic heading ....... and the true heading .......

025° 015° 020°

335° 035° 020°

335° 340° 035°

025° 015° 340°

#4. The directive force of the earth's magnetic field:

varies with the heading of the aircraft.

increases as the magnetic variation increases.

increases as magnetic latitude increases.

is greatest at the magnetic equator.

#5. The slow change in the earth's magnetic variation is known as the ....... change and is caused by .......

annual, westerly movement of the magnetic pole.

diurnal, easterly movement of the magnetic pole

secular, westerly movement of the magnetic pole.

annual, sunspot activity.

#6. Soft iron is comparatively ....... to magnetise whilst hard iron is ....... to demagnetise

easy; difficult.

easy; easy.

difficult; easy.

difficult; difficult.

#7. Which of the following materials are classed as ferromagnetic:

iron, steel, carbon-fibre.

nickel, iron, steel.

copper, iron, carbon steel.

iron, cobalt steel, chromium steel.

#8. The magnetic moment of a magnet:

is the product of pole strength and effective length.

varies inversely as the square of the distance between the poles

varies directly as the square of the distance between the poles.

decreases as the magnet length increases.

Dgca Question Bank For Pilots

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