The following sights are taken on a “turning point”________________?

A. Foresight only
B. Backsight only
C. Foresight and backsight
D. Foresight and intermediate sight

Which of the following errors can be eliminated by taking mean of bot face observations ?

A. Error due to imperfect graduations
B. Error due to eccentricity of verniers
C. Error due to imperfect adjustment of plate levels
D. Error due to line of collimation not being perpendicular to horizontal axis

If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to_________________?

1. Altitude bubble on index frame
2. Altitude bubble on index frame if it is to be used as a level
3. Altitude bubble on telescope
4. Altitude bubble on telescope if it is to be used as a level

Theodolite is an instrument used for_________________?

A. Tightening the capstan-headed nuts of level tube
B. Measurement of horizontal angles only
C. Measurement of vertical angles only
D. Measurement of both horizontal and vertical angles

Which of the following errors cannot be eliminated by taking both face observations ?

A. Error due to horizontal axis not being perpendicular to the vertical axis
B. Index error i.e. error due to imperfect adjustment of the vertical circle vernier
C. Error due to non-parallelism of the axis of telescope level and line of collimation
D. None of the above

In the double application of principle of reversion, the apparent error is_______________?

A. Equal to true error
B. Half the true error
C. Two times the true error
D. Four times the true error

If a tripod settles in the interval that elapses between taking a back sight reading and the following foresight reading, then the elevation of turning point will_________________?

A. Increase
B. Decrease
C. Not change
D. Either ‘a’ or ‘b’

A’level line’is a______________?

A. Horizontal line
B. Line parallel to the mean spheriodal surface of earth
C. Line passing through the center of cross hairs and the center of eye piece
D. Line passing through the objective lens and the eye-piece of a dumpy or tilting level

The rise and fall method of levelling provides a complete check on_______________?

A. Backsight
B. Intermediate sight
C. Foresight
D. All of the above

In an internal focussing type of telescope, the lens provided is_______________?

A. Concave
B. Convex
C. Plano-convex
D. Plano-concave