The curvature of the earth is taken into consideration if the limit of survey is:

Which of the following may not cause local attraction on a magnetic needle?

In levelling, the correction for curvature (in meters) is equal to

Deviation of the actual road gradient from the proposed contour gradient up hill side involves

The imaginary line joining the points if zero declination on the surface of the earth is called as

While measuring a chain line between two stations intervened by a raised ground

An imaginary line on the surface of the earth having a constant inclination with the horizontal (slope) is called

An angle measured clockwise from the proceeding survey line to the following survey line is called

In chain surveying tie lines are primarily provided