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


7.
How does the gimbal mechanism benefit a mariner’s compass?
A.
It enhances the magnetic field
B.
It prevents the compass from tipping
C.
It increases the compass’s size
D.
It illuminates the compass
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ANSWER :
B. It prevents the compass from tipping
8.
What material is typically used for the needle in a mariner’s compass?
A.
Aluminum
B.
Plastic
C.
Steel
D.
Magnetic alloy
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ANSWER :
D. Magnetic alloy
9.
Which part of a mariner’s compass is directly influenced by Earth's magnetic field?
A.
Compass card
B.
Needle
C.
Lubber line
D.
Gimbal
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ANSWER :
B. Needle
10.
What is the purpose of the fluid inside a mariner’s compass?
A.
To lubricate the needle
B.
To dampen needle movement and reduce oscillation
C.
To increase the compass’s weight
D.
To amplify magnetic signals
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ANSWER :
B. To dampen needle movement and reduce oscillation
11.
How does a mariner’s compass assist in navigation?
A.
By showing the depth of water
B.
By indicating the direction relative to Earth's magnetic poles
C.
By measuring wind speed
D.
By calculating longitude
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ANSWER :
B. By indicating the direction relative to Earth's magnetic poles
12.
In which scenario is a mariner’s compass most critical?
A.
Navigating by the stars
B.
Underwater exploration
C.
Coastal navigation without visual landmarks
D.
Aircraft navigation
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ANSWER :
C. Coastal navigation without visual landmarks