101.
a) In levelling, a station is the point where the levelling staff is held and
not where level is set up.
b) The inner surface of a bubble tube is an arc of a circle.
c) Sensitiveness of a level tube can be increased by the increase in length of
bubble.
102. The distance to the visible horizon from a height of 36 m above mean sea level is given by
103. Dumpy level is most suitable when
many readings are to be taken from a single setting of the instrument
104. The difference of levels between two stations A and B is to be determined.For
best results, the instrument station should be
equidistant from A and B
105. Contour interval is inversely proportional to the scale of the map
106. An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as
contour gradient
107. The suitable contour interval for a map with scale 1 : 10000 is
2 m
108 Two contours of different elevations do not cross each other except in case
of an overhanging cliff.
109. A series of closely spaced contour lines represents a steep slope
110. Direct method of contouring is most accurate method
111. In direct method of contouring, the process of locating or identifying points lying on a contour is called vertical control
112. In the cross-section method of indirect contouring, the spacing of cross-sections depends upon
contour interval, scale of plan, characteristics of ground
113. Which of the following methods of contouring is most suitable for a hilly terrain ? tacheometric method
114.Contour interval on any map is kept constant
115. Closed contours, with higher value inwards, represent a hillock
116. Contour interval is the vertical distance between two consecutive contours
117. Benchmark is established by spirit levelling
118. The type of surveying which requires least office work is plane table surveying
119. Intersection method of detailed plotting is most suitable for hilly areas
120. Detailed plotting is generally done by radiation