Compass surveying

The meridian through a point is the line in which a plane, passing that point and the north & south poles, intersection with surface of the earth

• Magnetic meridian

• Arbitrary meridian

• True meridian

• Magnetic bearing

Box of prismatic compass box is made of

• Aluminum

• Brass

• Steel

• Iron

True meridian passes through

• A fixed point

• True north & true south

• Equatorial line

• All of the above

At equator amount of dip is

• 0°

• 45°

• 60°

• 90°

The algebraic sum of deflection angles in a closed traverse is

• 360°

• 180°

• 90°

• 0°

Magnetic meridian & true meridian are

• Always parallel

• Parallel near the poles

• Parallel at equator

• Never parallel

If n is the number of sides, then the total sum of the exterior angle in a closed traverse is ____°

• (n+2)×90

• (2n-4)×90

• (2n+4)×90

• (4n-2)×90

Local attraction in a compass survey may exist due to

• Faulty adjustment in compass

• Presence of magnetic materials

• Loss of magnetism in the needle

• Friction of the needle at the point

In surveyors compass the zero is marked at the _____of the circular graduated ring

• Both north & south ends

• East end

• South end

• North end

The magnetic bearing of a line is 85°30' ane the magnetic declination at that place is 4°30' East. True bearing will be ___°

• 84

• 90

• 81

• 91