General Principles in the Working of Mariner's Compass, Lightning Conductors NDA Questions

NDA Physics

General Principles in the Working of Mariner's Compass, Lightning Conductors MCQ Questions


13.
Which method is often used to correct a mariner’s compass for magnetic deviation?
A.
Calibrating with a GPS
B.
Adjusting with a protractor
C.
Using compensating magnets
D.
Immersing in a magnetic fluid
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ANSWER :
C. Using compensating magnets
14.
What does “compass heading” refer to?
A.
Direction of wind
B.
Course set relative to magnetic north
C.
Position of the sun
D.
Speed of the vessel
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ANSWER :
B. Course set relative to magnetic north
15.
What is the typical reference direction used in a mariner’s compass?
A.
True north
B.
Magnetic north
C.
Grid north
D.
Solar north
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ANSWER :
B. Magnetic north
16.
What is magnetic variation?
A.
The angle between true north and magnetic north
B.
The oscillation of the compass needle
C.
The difference between compass heading and true heading
D.
The fluctuation in Earth's magnetic field
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ANSWER :
A. The angle between true north and magnetic north
17.
How can magnetic deviation affect a mariner’s compass?
A.
By stabilizing the needle
B.
By causing errors due to local magnetic fields
C.
By improving accuracy
D.
By making the compass needle point to true north
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ANSWER :
B. By causing errors due to local magnetic fields
18.
What is the purpose of a deviation card?
A.
To record corrections for compass errors
B.
To log GPS coordinates
C.
To calculate wind speed
D.
To measure water depth
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ANSWER :
A. To record corrections for compass errors