# The principal plane contains

A. Nadir point

B. Iso-centre

C. Principal point

D. All the above

**Answer: Option D **

A. 77° N

B. 23° S

C. 13° E

D. 13° W

A. equidistant from A and B

B. closer to the higher station

C. closer to the lower station

D. as far as possible from the line AB

**Pick up the correct statement from the following:**

A. The principal point coincides with plumb point on a true vertical photograph

B. The top of a hill appears on a truly vertical photograph at greater distance than its bottom from the principal point

C. The top of a hill is represented on a vertical photograph at larger scale than the area of a nearby valley

D. All the above

A. Geodetic triangulation of greatest possible sides and accuracy is carried out

B. Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

C. Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys

D. All the above

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