UPPSC AE (CE) Quiz 31

Statement 1: A magnetic needle suspended freely might not be aligned with the magnetic north.

Statement 2: Magnetic needle deviates from its path due to presence of magnetic substances nearby known as local attraction.

The following table gives the fore bearings and back bearings in a triangular closed traverse. Find out the corrected fore bearing of CA.

Which one of the following is a cause of avoidable local attraction at a station?

i. High tension electric wire

ii. Reinforcement in concrete column

iii. Steel tape in the vicinity

Assertion (A): If the difference between the fore bearing and back bearing of a line between two stations is less than 180°, it means that at least one station has local attraction.

Reason (R): In case of local attraction at one station, the difference between the fore bearing and back bearing of the line is less than 180°.

The following bearings were observed in an open traverse. Which of the stations are suspected of local attraction?

During Traversing the magnetic meridian is established only at starting station and bearing of other lines are measured indirectly. This method of traversing is known as

Consider the following statements.

i. Latitude is orthographic projection of a line on N-S axis

ii. Departure is orthographic projection of a line on the axis perpendicular to meridian

iii. Latitude is considered positive when projection of line is on north side

iv. Departure is considered positive when projection of line is on west side

Which of the above statements are correct.

Statement 1: A link traverse is a type of traverse which does not from a closed loop but the positions of its end points are known.

Statement 2: Link traverse is an open traverse.

An area was traversed using a theodolite and an electronic distance measurement instrument (EDMI). If the least count of theodolite is 20”. What will be the degree of precision required for linear measurement.

Assume. tan (20’’) = 9.696 × 10^–5

During Traversing the magnetic bearing of a line AB measured to be 30˚ and length of the line observed to be 400 m. What will be latitude and departure of the line.