Surveying Questions and Answers – Introduction – Magnetic Bearing

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Introduction – Magnetic Bearing”.

1. Which line passes through a point, such that plane passing that point and the north and south poles, intersects with the surface of the earth?
a) True Meridian
b) Magnetic Meridian
c) Arbitrary Meridian
d) Survey line

Explanation: True Meridian passes through the true north and south. Magnetic meridian is the imaginary line that connects magnetic south and north poles. Survey line is the line along which surveying proceeds.

2. Horizontal angle with the true Meridian through one of the extremities of the line is called?
a) True bearing
b) Magnetic Bearing
c) Arbitrary bearing
d) Bearing

Explanation: True bearing of a line is the horizontal angle which it makes with the true Meridian through one of the extremities of the line. Compass needle will be parallel to the magnetic meridian. Angle measured always keeping magnetic north as a reference is called magnetic bearing.

3. Direction shown by a freely floating and balanced magnetic needle free from all other attractive forces is __________
a) True Meridian
b) Magnetic Meridian
c) Arbitrary Meridian
d) Survey line

Explanation: Magnetic Meridian through a point is the direction shown by a freely floating and balanced magnetic needle free from all other attractive forces. Arbitrary Meridian is any Convenient direction towards permanent and prominent mark or signal, such as top of chimney or church spire.

4. Horizontal angle with the Magnetic Meridian through one of the extremities of the line is called ______
a) True bearing
b) Magnetic Bearing
c) Arbitrary bearing
d) Magnetic Declination

Explanation: Magnetic bearing of a line is the horizontal angle which it makes with the Magnetic Meridian through one of the extremities of the line.

5. Convenient direction towards permanent and prominent mark or signal is _________
a) True Meridian
b) Magnetic Meridian
c) Arbitrary Meridian
d) Survey line

Explanation: Arbitrary Meridian is any convenient direction towards permanent and prominent mark or signals, such as top of chimney or church spire. Magnetic meridian is the imaginary line that connects magnetic south and north poles.
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6. Horizontal angle with the Arbitrary Meridian through one of the extremities of the line is called _______
a) True bearing
b) Magnetic Bearing
c) Arbitrary bearing
d) Magnetic Declination

Explanation: Arbitrary bearing of a line is the horizontal angle which it makes with the arbitrary meridian through one of the extremities of the line. Angle measured always keeping magnetic north as reference is called magnetic bearing.

7. The Magnetic Bearing of a line is 48°24′. Calculate the true bearing if the magnetic declination is 5°38′ East.
a) 54°02′
b) 44°02′
c) 54°22′
d) 45°02′

Explanation: Magnetic Declination is the horizontal angle between true meridian and magnetic meridian. Declination = +5°38’, magnetic bearing = 48°24’, then here, true bearing is sum of both i.e 48″24′ + 5°38′ = 54°02′.

8. The magnetic bearing of a line AB is S 28°30′ E. Calculate the true bearing if the declination is 7°30′ West.
a) N 36°00′ W
b) S 21°00′ E
c) S 36°00′ E
d) N 21°00′ W

Explanation: Since the declination is to be west, the magnetic meridian will be to the west of the true meridian. Therefore, true bearing = S 28°30′ E + 7°30′ = S 36°00’ E.

9. Horizontal angle between true meridian and magnetic meridian is __________
a) True bearing
b) Magnetic Bearing
c) Arbitrary bearing
d) Magnetic Declination

Explanation: Magnetic Declination is a horizontal angle between true meridian and magnetic meridian. Arbitrary bearing of a line is the horizontal angle which it makes with the Arbitrary Meridian through one of the extremities of the line.

10. When magnetic meridian is right side to true meridian, then Magnetic Declination is said to be _________
a) Eastern
b) Western
c) Southern
d) Northern

Explanation: When magnetic meridian is right side to true meridian, then Magnetic Declination is said to be positive or eastern. Magnetic Declination is horizontal angle between true meridian and magnetic meridian.

11. When magnetic meridian is left side to true meridian, then Magnetic Declination is said to be ________
a) Eastern
b) Western
c) Southern
d) Northern

Explanation: When magnetic meridian is left side to true meridian, then Magnetic Declination is said to be negative or western. Magnetic Declination is horizontal angle between true meridian and magnetic meridian.

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