Two contour lines, having the same elevation cannot cross each other can cross e

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Question
Two contour lines, having the same elevation
Options
A. cannot cross each other
B. can cross each other
C. cannot unite together
D. can unite together.

Correct Answer

can unite together.

Surveying problems

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2. Pick up the correct statement from the following :
Options
A. The directions of plumb lines suspended at different points in a survey are not strictly parallel
B. In surveys of small extent, the effect of curvature may be ignored and the level surface of the earth is assumed as horizontal
C. In surveys of large extent, the effect of curvature of the earth must be considered
D. All the above.

3. Pick up the correct statement from the following
Options
A. the contour lines having the same elevation cannot unite and continue as one line
B. a contour can not end abruptly, but must ultimately close itself not necessarily within the limits of map.
C. the direction of steepest slope at a point on a contour is at right angles to the contour
D. all the above.

4. The Trapezoidal rule of volumes V of an embankment divided into a number of sections equidistant D, is given by
Options
A.
B.
C. V = [A₁ + A_n + 2(A₂ + A₄ + ... + A_{n - 1}) + 4(A₃ + A₅ + ... + A_{n - 2})]
D. V = [A₁ + A_n + 4(A₂ + A₄ + ... + A_{n - 1}) + 4(A₃ + A₅ + ... + A_{n - 2})].

5. The representation of general topography of a very flat terrain is possible only
Options
A. by drawing contours at large interval
B. by drawing contours at small interval
C. by giving spot levels at large interval
D. by giving spot levels to salient features at close interval.

6. In geodetic surveys higher accuracy is achieved, if
Options
A. curvature of the earth surface is ignored
B. curvature of the earth surface is taken into account
C. angles between the curved lines are treated as plane angles
D. none of these.

7. While working on a plane table, the correct rule is :
Options
A. Draw continuous lines from all instrument stations
B. Draw short rays sufficient to contain the points sought
C. Intersection should be obtained by actually drawing second rays
D. Take maximum number of sights as possible from each station to distant objects.

9. The lens equation is applicable
Options
A. when the thickness of the lens is small
B. only to conjugate distances along the principal axis
C. the computed quantities are accurate enough for geometrical optics of simple distances
D. all the above.

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