1. Which branch of surveying is used to find the elevations of given points with respect to given or assumed datum?
a) Levelling
b) Contouring
c) Traversing
d) Plane table surveying
Explanation: Levelling is a branch of surveying is used to find the elevations of given points with respect to given or assumed datum
2. Levelling is a branch of surveying objects of which is to establish points at a given elevation or at different elevations with respect to given or assumed datum.
a) True
b) False
Explanation: The first operation is required to enable the works to be designed while the second operation is required in the setting out of all kinds of engineering works.
3.Levelling deals with measurements in a ______
a) Horizontal plane
b) Inclined plane
c) Vertical plane
d) Both vertical and horizontal plane
Explanation: Levelling is a branch of surveying objects of which is to establish points at a given elevation or at different elevations with respect to given or assumed datum. It deals with measurements in a vertical plane
4. _______ is defined as a curved surface which at each point is perpendicular to the direction of gravity at the point.
a) Level surface
b) Level line
c) Horizontal plane
d) Datum
Explanation: The surface of still water is a truly level surface. Any surface parallel to the mean spheroidal surface of the earth is, therefore, a level surface.
5. _______ is a line lying in a level surface.
a) Level line
b) Horizontal line
c) Datum line
d) Plumb line
Explanation: A level line is a line lying in a level surface. It is, therefore, normal to the plumb line, at all points
6. Horizontal plane through a point is a plane tangential to the level surface at that point.
a) True
b) False
Explanation: Horizontal plane through a point is a plane tangential to the level surface at that point. It is, therefore, perpendicular to the plumb line through the point.
7. Which line is the tangential to the level line at a point?
a) Datum line
b) Vertical line
c) Horizontal line
d) Plumb line
Explanation: It is straight line tangential to the level line at a point. It is also perpendicular to the plumb line.
8. Which line is normal to the level line at a point?
a) Datum line
b) Vertical line
c) Horizontal line
d) Plumb line
Explanation: Vertical line is a line normal to the level line at a point. It is commonly considered to be the line defined by a plumb line.
9. Which term is used for the surface to which elevations are referred?
a) Level surface
b) Level line
c) Horizontal plane
d) Datum
Explanation: Datum is any surface to which elevations are referred. The mean sea level affords a convenient datum world over.
10. The elevations of points or near the surface of the earth is its vertical distance above or below an arbitrary assumed level surface or datum.
a) True
b) False
Explanation: The difference in elevation between two points in the vertical distance between the two level surface in which the two points lie. Elevation simply can say vertical distance.