Earth Magnetism: DGCA Air Navigation questions

Question 1

The sensitivity of a direct reading magnetic compass is:

Accepted Answer

Proportional to the horizontal component of the Earth's magnetic field

Answer

Inversely proportional to the horizontal component of the Earth's magnetic field

Answer

Inversely proportional to the vertical component of the Earth's magnetic field

Answer

Inversely proportional to both the vertical and horizontal components of the Earth's magnetic field

Question 2

What is the definition of magnetic variation?

Accepted Answer

The angle between Magnetic North and True North

Answer

The angle between the direction indicated by a compass and Magnetic North

Answer

The angle between True North and Compass North

Answer

The angle between Magnetic Heading and Magnetic North

Question 3

At the magnetic equator:

Accepted Answer

Dip is zero

Answer

Variation is zero

Answer

Deviation is zero

Answer

The isogonal is an agonic line

Question 4

Which of these is a correct statement about the Earth's magnetic field?

Accepted Answer

It acts as though there is a large blue magnetic pole in Northern Canada

Answer

The angle of dip is the angle between the vertical and the total magnetic force

Answer

It may be temporary, transient, or permanent

Answer

It has no effect on aircraft deviation

Question 5

Where is a compass most effective?

Accepted Answer

About midway between the Earth's magnetic poles

Answer

In the region of the magnetic South Pole

Answer

In the region of the magnetic North Pole

Answer

On the geographic equator

23 more questions in this chapter, free with an account