Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking both face observations and taking the mean of the two
double sighting
taking mean of several readings distributed over different portions of the graduated circle
reading both verniers and taking the mean of the two

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Surveying
Normal tension is that pull which

is used at the time of standardising the tape
neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero
makes the correction due to sag equal to zero

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By subtracting their longitudes if places are in the same hemisphere
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By adding their longitudes if places are in the different hemispheres

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of any two sides is greater than the third
Every angle is less than two right angles
Sum of the three angles is equal to two right angles
Sum of the three angles less than six right angles and greater than two right angles

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