Contouring

JKSSB Junior Engineer (Civil) · Surveying · 9 practice questions with answers and explanations: 7 Easy, 2 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The contour interval chosen for a map depends on:

  1. The scale of the map, the ground slope and the purpose of the map
  2. The colour of the paper
  3. The length of the staff
  4. The weather only
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Answer: A. A small scale or steep ground needs a larger interval.

Sample Easy question 2

Which statement about contours is correct?

  1. Contours are always straight lines
  2. Contours of different elevations cannot cross except at an overhanging cliff or a cave
  3. Contours never close on themselves
  4. Contours of different elevations always cross each other
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Answer: B. Where they meet on a vertical face, several contours coincide.

Sample Easy question 3

Closely spaced contours indicate:

  1. A steep slope
  2. A water body
  3. A flat plain
  4. A gentle slope
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Answer: A. A small horizontal gap for the same vertical interval means a steeper slope.

Sample Medium question 4

The areas enclosed by two contours 2 m apart are 1,000 m² and 800 m². By the trapezoidal formula, the volume between them is:

  1. 1,800 m³
  2. 900 m³
  3. 2,000 m³
  4. 3,600 m³
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Answer: A. V = (h ÷ 2) × (A₁ + A₂) = 1 × 1,800 = 1,800 m³.

Sample Medium question 5

Contours at an interval of 2 m are 50 m apart on the map scale of the ground. The ground gradient is:

  1. 1 in 25
  2. 1 in 50
  3. 1 in 100
  4. 1 in 10
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Answer: A. Gradient = vertical interval ÷ horizontal distance = 2 ÷ 50.

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