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41. For which of the following permanent adjustments of theodolite, the spire test is used ?

A. adjustment of plate levels

B. adjustment of line of sight

C. adjustment of horizontal axis

D. adjustment of altitude bubble and vertical index frame

Explanation:

42. Which of the following errors can be neutralised by setting the level midway between the two stations ?

A. error due to curvature only

B. error due to refraction only

C. error due to both curvature and re-fraction

D. none of the above

Explanation:

43. 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 i) altitude bubble on index frame ii) altitude bubble on index frame if it is to be used as a level iii) altitude bubble on telescope iv) altitude bubble on telescope if it is to be used as a level The correct answer is

A. only (i)

B. both (i) and (iv)

C. only (iii)

D. both (ii) and (iii)

Explanation:

44. 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

Explanation:

45. 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

Explanation:

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