MCQs / Q&A

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
The correct answer is?
A. only (1)
B. both (1) and (4)
C. only (3)
D. both (2) and (3)

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

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

A. equal to true error
B. half the true error
C. two times the true error
D. four times the true error

A. increase
B. decrease
C. not change
D. either ‘a’ or ‘b’

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

A. backsight
B. intermediate sight
C. foresight
D. all of the above

A. concave
B. convex
C. plano-convex
D. plano-concave

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

A. leveling
B. prolonging a straight line
C. measurement of horizontal angles
D. all of the above