# Surveying Questions and Answers – Interpolation of Contours

This set of Surveying Multiple Choice Questions & Answers focuses on “Interpolation of Contours”.

1. What is the process of spacing the contours proportional between the plotted ground points established by indirect methods?
a) Interpolation
b) Tacheometric method
c) Cross section method
d) By squares method

Explanation: Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods.

2. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform.
a) True
b) False

Explanation: Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform.

3. Which of the following is not a chief method of Interpolation?
a) By estimation
b) By arithmetic calculation
c) By graphical method
d) By cross sections

Explanation: The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform. The chief methods of Interpolation are by estimation, by arithmetic calculations, by graphical method.

4. Which of the following methods is extremely rough and is used for small scale work only?
a) By estimation
b) By arithmetic calculation
c) By graphical method
d) By cross sections

Explanation: Estimation method is extremely rough and is used for small scale work only. The positions of contour points between the guide points are located by estimation.

5. The positions of contour points between the guide points are located by _______
a) Estimation
b) Arithmetic calculations
c) Graphical method
d) Cross sections

Explanation: Estimation method is extremely rough and is used for small scale work only. The positions of contour points between the guide points are located by estimation.

6. Which of the following Interpolation method is accurate and time consuming?
a) by estimation
b) by Arithmetic method
c) by graphical method
d) by squares

Explanation: Arithmetic method is accurate but time consuming. The positions of contour between the guide points are located by arithmetic calculation.

7. In which of the following methods Interpolation is done with the help of a tracing paper?
a) by estimation
b) by Arithmetic method
c) by graphical method
d) by squares

Explanation: In the graphical method, the Interpolation is done with the help of a tracing paper. Sometimes tracing cloth is also used.

8. In cross sections method, cross sections are run traverse to the centre line of a road, railway or canal etc.
a) True
b) False

Explanation: In this method, cross sections are run transverse to the centre line of a road, railway or canal etc. The method is most suitable for railway route surveys.

9. In the case of hilly terrain, the tacheometric method may be used with advantages.
a) True
b) False

Explanation: In the case of hilly terrain, the tacheometric method may be used with advantages. A tacheometer is a theodolite fitted with stadia diaphragm so that staff readings against all the three hairs may be taken.

10. In cross sections method, If there are irregularities in the surface between two cross lines, additional guide points may be located on intermediate cross lines.
a) True
b) False

Explanation: If there are irregularities in the surface between two cross lines, additional guide points may be located on intermediate cross lines. If required, some of the cross lines may also be chosen at any inclination other 90° to the main line.

Sanfoundry Global Education & Learning Series – Surveying.

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