Surveying and Levelling

141. In a lemniscate curve the ratio of the angle between the tangent at the end of the polar ray and the straight, and the angle between the polar ray and the straight, is

1. 2
2. 3
3. 43528
4. 43499

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142. In a perfect prismatic compass

1. Magnetic axis and geometric axis of the needle coincide
2. Ends of the needle and pivot are in same vertical and horizontal planes
3. Pivot is vertically over the centre of the graduated circle
4. All the above

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143. In a precision traverse, included angles are measured by setting the vernier

1. To read zero exactly on back station
2. To read 5° exactly on back station
3. Somewhere near zero and reading both verniers on back station
4. All the above

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144. In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is

1. 5.24 cm
2. 6.24 cm
3. 7.24 cm
4. 8.24 cm

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145. In a theodolite

1. The telescope axis is perpendicular to transit axis
2. The axis of rotation is perpendicular to transit axis
3. The telescope axis, the transit axis and the rotation axis pass through the centre of theodolite
4. All the above

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146. In an adjusted level, when the bubble is central, the axis of the bubble tube becomes parallel to

1. Line of sight
2. Line of collimation
3. Axis of the telescope
4. None of these

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147. In an internal focusing telescope

1. The objective is at a fixed distance from the diaphragm
2. The focusing is done by the sliding of a divergent lens
3. The focusing divergent lens is situated at about the middle of the tube
4. All the above

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148. In case of a direct vernier scale

1. Graduations increase in opposite direction in which graduations of the main scale increase
2. Smallest division is longer than smallest division of the main scale
3. Graduations increase in the same direction in which graduations of the main scale increase
4. None of these

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149. In case of a double line river, contours are

1. Stopped at the banks of the river
2. Stopped at the edge of the river
3. Drawn across the water
4. Drawn by parabolic curves having their vertex at the centre of the water

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150. In case of reduction of levels by the height of instrument method,

1. ∑ B.S. - ∑ F.S. = difference in R.L.S of the first station and last station
2. ∑ (R.L. + I + F.S.) - first R.L = ∑ (H.I. + No. of R.L.s.)
3. Both (a) and (b) above
4. Neither (a) nor (b)

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