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


1.
What is the primary function of a mariner’s compass?
A.
Measuring temperature
B.
Determining direction
C.
Calculating distance
D.
Predicting weather
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ANSWER :
B. Determining direction
2.
Which component of the mariner’s compass is responsible for pointing north?
A.
Card
B.
Needle
C.
Lubber line
D.
Gimbal
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ANSWER :
B. Needle
3.
What liquid is often used to dampen the needle in a mariner’s compass?
A.
Mercury
B.
Kerosene
C.
Water
D.
Alcohol
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ANSWER :
D. Alcohol
4.
Which feature of a mariner’s compass helps stabilize it on a moving ship?
A.
Gimbal
B.
Baseplate
C.
Mirror
D.
Index line
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ANSWER :
A. Gimbal
5.
What does the lubber line on a mariner’s compass indicate?
A.
Direction of travel
B.
Magnetic north
C.
True north
D.
Declination
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ANSWER :
A. Direction of travel
6.
What is the main purpose of the compass card in a mariner’s compass?
A.
To adjust magnetic deviation
B.
To provide directional reference
C.
To stabilize the needle
D.
To measure speed
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ANSWER :
B. To provide directional reference