ESE 2021 Technical Quiz : Errors and Adjustment

Principal of Least square states that,

Most Probable Value of a Quantity is the one which

(i) have maximum chances of being true than any other value.

(ii) have 50% chances of being true.

(iii) is derived from probability curves

(iv) is equal to weighted arithmetic mean of all the observations.

Consider the following statements:

Statement 1: Theory of Errors basically deals with Accidental Errors

Statement 2: Gross and Systematic errors can be removed by applying necessary corrections.

Which one of the following are correct?

i. In terrestrial photogrammetry, photographs are taken from ground

ii. In aerial photogrammetry, photographs are taken from aircraft

iii. Parallax is the distance between two parallel line of flights

The coordinates of point A on a photograph are (4 cm, 3 cm) and of point B are (7cm, 7cm) respectively. If both the points are at mean sea level, the height of aircraft is 2000 m and, the focal length of the photograph is 16cm, find the length of line AB.