Explanation: Geodic surveying is used because it is assumed that the distances between the points observed are not large so that either the effect of curvature and refraction may be neglected or proper corrections may be applied linearly.

Explanation: Other than plane table surveying, remaining methods need a compass for initiating the work in which it is not possible to access compass in a magnetic area. Plane table surveying can be employed there as it can be done without usage of compass.

Explanation: Survey which deals with bodies of water for the purpose of navigation, water supply, harbor works or for the determination of mean sea level is hydrographic surveying.

Explanation: Determining points of strategic importance is military surveying. City surveying is made in connection with the construction of streets, water supply systems and sewers.

Explanation: Instrumental errors are those which arise due to the faulty adjustment of the instrument e.g pivot being bent, blunt pivot point, etc. Variation in declination, magnetic changes in the atmosphere due to clouds and Strom’s etc also comes under natural errors in compass surveying.

Explanation: Plane table surveying is a rough process conducted in order to have an idea of the land and its condition for construction. Due to this, it is not capable of producing accurate output in its recording.

Explanation: Marine survey involves certain features which are capable of determining the boat functioning and its capabilities. The main purpose of marine surveying includes the processing of an errorless functioning boat, which can be used while underground surveying.

Explanation: Marine surveying involves certain classifications which can be given as yacht survey, machinery survey and cargo survey. All these are under the roof of marine surveying, which done to improve the benefit of the instrument or object used.

Explanation: Photo-theodolite involves the direction of same objects in the photograph by which base is measured is known and positions are located with extremities. It is the same as that of plane table surveying which indicates both are having same principle.

Explanation: The deflection distances method is having at most priority in case of road surveys as the curvature for joining parallel straights is to be done without any error.