An arbitrary surface with reference to which the elevation of points are measured and compared, is called

A surface which is normal to the direction of gravity at all points, as indicated by a plumb line, is known as

The method of surveying used for determining the relative heights of points on the surface of the earth is called

The length of a traverse line (L) may be obtained by

When the angular and linear measurements are equally precise in traversing the balancing of traverse is done by

The latitude and departure of a traverse line are both + ve, when the whole circle bearing of the line lies in between

When the whole circle bearing of a traverse line is between 90° and 180° then

In any closed traverse, if the survey work is correct,

In theodolite traverse the angular error of closure should

The angle between the inclined line of sight and the horizontal is called

Direct angle may have any value between

In a traverse the angle measured clockwise from the preceding survey line to the following survey line is called

The deflection angle may have any value between

Deflection angle in a traverse is equal to the

The angle made by a survey line with the prolongation of preceding line, is known as

Using theodolite the horizontal angle is more accurately measured by

Due to magnetic influence of earth, the magnetic needle of the prismatic compass will be Inclined downward towards the pole. This inclination of the needle with the horizontal is known as

Plotting of in accessible points on a plane table is done by

While setting up a plane table at any station

While surveying a plot of land by plane tabling, the field observations

Closed contours of decreasing values towards their centre, represent

Straight parallel and widely spaced contours represent

The contour interval, within limits of a map

The boundary of water of a still lake,represents

An imaginary line joining the points of equal elevation on the surface of the earth, represents

For the preparation of high way project

While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of levelling staff and cross hairs, the instrument is

The line of collimation method of reduction of levels, does not provide a check on

A relatively fixed point of known elevation above datum, is called

The line normal to plumb line at all points is known as

The sensitiveness of a level tube decreases if

An imaginary line passing through the intersection of cross hairs and optical centre of the objective is known as

In an adjusted level, when the bubble is centred, the axis of the bubble tube becomes parallel to

Contour lines can not cross each other except in case of

The level difference in between two consecutive contours is called

The least count of a leveling staff is

The magnetic bearing of a line is 55° 30' and the magnetic declination is 4° 30' West. The true bearing of the line will beA.510B

At the equator, the amount of dip is

The horizontal angle between the true meridian and magnetic meridian is known as

In a whole circle bearing System, S 30° 15' E corresponds to

Sum of exterior angles of a closed traverse of sides 'N' is equal to

The bearing of line AB is 180° and bearing of line BC is 30°, then included angle B is

The fore bearing of a line is N 30° E ,then it's back bearing is

The whole circle bearing of a line is 185º.Then it's reduced bearing is

The line in which the plane passing through the given point, north pole and south pole intersects the surface of the earth is called

In prismatic compass the graduations are marked such that zero is at

The least count of prismatic compass is

The angle of intersection of the horizon glass and index glass in an optical square is

In a well-conditioned triangle no angle should be less than

The error in measured length due to sag of a chain or tape is known as