1. Find the value of R.L, if B.M = 400 m, B.S = 1.142 m, F.S = 2.121 by using rise and fall method?
a) 400.79 m
b) 400.97 m
c) 409.79 m
d) 399.02 m
Explanation: In the rise and fall method, first we must calculate the difference between B.S and F.S. We get 1.142 – 2.121 = -0.979 m, which is negative. It means we have to subtract it from the given B.M for obtaining R.L i.e., R.L = 400 – 0.979 = 399.021 m.
2. If d = 2.94 km, what would be the combined correction for curvature and refraction?
a) 1.85 km
b) 0.85 km
c) 0.58 km
d) 1.58 km
Explanation: We know that combined correction for curvature can be given as \(C = \frac{6d^2}{14R}\) On substituting the value the of d in the above equation we get,
\(C = \frac{6d^2}{14R} = \frac{6*2.94^2}{14*6370} = 0.5814 km.\)
3. What is the term used for an imaginary line on the ground joining points of equal elevation?
a) Level line
b) Line of sight
c) Datum
d) Contour
Explanation: A Contour is an imaginary line on the ground joining the points of equal elevation. It is a line in which the surface of the ground is interested in a level surface.
4. Which of the following lines, in which surface of the ground is intersected by a level surface
a) Level line
b) Line of sight
c) Datum
d) Contour
Explanation: A Contour is an imaginary line on the ground joining the points of equal elevation. It is a line in which the surface of the ground is interested in a level surface.
5. A Contour line is a line on the map representing a contour.
a) true
b) false
Explanation: A Contour is an imaginary line on the ground joining the points of equal elevation. It is a line in which the surface of the ground is interested in a level surface. A Contour line is a line on the map representing a contour.
6. Which of the following is not used to represent the relative altitudes of the points on the map?
a) Contour lines
b) Hachures
c) Shading
d) Level lines
Explanation: On a plan, the relative altitudes of the points can be represented by shading, Hachures, form lines or contour lines. Out of these, contour lines are most widely used because they indicate the elevations directly.
7. Which of the following indicates the elevations directly?
a) Level line
b) Line of sight
c) Datum
d) Contour
Explanation: A Contour is an imaginary line on the ground joining the points of equal elevation. It is a line in which the surface of the ground is interested by a level surface. On a plan, the relative altitudes of the points can be represented by shading, Hachures, form lines or contour lines. Out of these, contour lines are most widely used because they indicate the elevations directly.
8. The vertical distance between any two contours is called a contour interval.
a) true
b) false
Explanation: The vertical distance between any two consecutive contours is called a contour interval. The contour interval is kept constant for a contour plan.
9. The horizontal distance between two points in two consecutive contours is known as the vertical equivalent.
a) true
b) false
Explanation: The horizontal distance between two points in two consecutive contours is known as the horizontal equivalent. It depends on the steepness of ground.
10. For every flat ground, a small contour interval is necessary.
a) true
b) false
Explanation: A contour interval chosen for a flat ground will be highly unsuitable for undulated ground. For every flat ground, a small interval is necessary.