Levelling

JKSSB Junior Engineer (Civil) · Surveying · 14 practice questions with answers and explanations: 8 Easy, 6 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The sensitiveness of a bubble tube increases when:

  1. The radius of curvature of the tube is increased
  2. The liquid is thicker
  3. The tube is shorter
  4. The tube is wider
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Answer: A. A flatter tube makes the bubble move farther for the same tilt.

Sample Easy question 2

Fly levelling is done to:

  1. Find the area of a field
  2. Connect a benchmark to a distant work site quickly, without intermediate sights
  3. Measure the width of a river
  4. Set out a curve
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Answer: B. Only backsights and foresights are taken, so the accuracy is lower than that of ordinary levelling.

Sample Easy question 3

Profile levelling is carried out to get:

  1. A longitudinal section along the centre line of a road or canal
  2. A map of the contours
  3. The volume of an embankment
  4. The area of a plot
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Answer: A. Cross-sections are taken at right angles to the line to complete the picture.

Sample Medium question 4

A backsight of 2.455 m is taken on a benchmark of RL 150.000 m. A foresight of 0.755 m is taken to a point. The RL of the point is:

  1. 149.245 m
  2. 148.300 m
  3. 153.210 m
  4. 151.700 m
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Answer: D. HI = 150.000 + 2.455 = 152.455 m, and RL = 152.455 − 0.755 = 151.700 m.

Sample Medium question 5

The sum of the backsights is 6.200 m and the sum of the foresights is 4.950 m. The first RL is 100.000 m. The last RL is:

  1. 106.200 m
  2. 100.000 m
  3. 98.750 m
  4. 101.250 m
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Answer: D. Last RL − first RL = ΣBS − ΣFS = 1.250 m.

Sample Medium question 6

The curvature correction alone for a sight of 3 km is (0.0785 d², with d in km):

  1. 1.41 m
  2. 0.61 m
  3. 0.71 m
  4. 0.24 m
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Answer: C. C = 0.0785 × 3² = 0.707 m. With refraction taken into account, the correction falls to 0.0673 d².

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