Solved Example: 9035-01

Which of the following is the INCORRECT correction to be applied while determining the difference in elevation between two points, when the observations are from only one point?

A. Axis signal correction

B. Correction for sag

C. Correction for curvature

D. Correction for refraction

Correct Answer: B

Solved Example: 9035-02

Levelling in which levels on each side of the main line at right angles to that line is called? (PGCIL DT Civil 2020)

A. Precise levelling

B. Profile levelling

C. Differential levelling

D. Cross sectioning

Correct Answer: D

The grade of a highway is a measure of its incline or slope. The amount of grade indicates how much the highway is inclined from the horizontal. For example, if the section of road is perfectly flat and level, then its grade along that section is zero. However, if the section is very steep, then the grade along the that section will be expressed as a number, usually a percentage, such as 10 percent.

Solved Example: 9036-01

The permissible error (E) for the Precise levelling type with distance (D) in kilometre is given by: (DFCCIL Exec Civil 2018)

A. $E = \pm 0.025\sqrt{D}$

B. $E = \pm 0.100\sqrt{D}$

C. $E = \pm 0.012\sqrt{D}$

D. $E = \pm 0.006\sqrt{D}$

Correct Answer: D

Solved Example: 9036-02

Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than________m. (KPSC AE 2017)

A. 15

B. 20

C. 25

D. 30

Correct Answer: C