Surveying and Levelling

191. Perpendicularity of an offset may be judged by eye, if the length of the offset is

1. 5 m
2. 10 m
3. 15 m
4. 20 m

View answer

192. Pick up the correct specification of Ramsden eyepiece from the following:

1. It consists of two equal piano convex lenses
2. The curved surfaces of Plano-convex lenses face each other
3. The distance between the diaphragm and the front lens of the eyepiece is kept equal to 1/4 th of the focal length of a lens so that rays from a point on the diaphragm enter the eye as a parallel beam
4. All the above

View answer

193. Pick up the correct statement from the following

1. The contour lines having the same elevation cannot unite and continue as one line
2. A contour can not end abruptly, but must ultimately close itself not necessarily within the limits of map
3. The direction of steepest slope at a point on a contour is at right angles to the contour
4. All the above

View answer

194. Pick up the correct statement from the following:

1. The directions of plumb lines suspended at different points in a survey are not strictly parallel
2. In surveys of small extent, the effect of curvature may be ignored and the level surface of the earth is assumed as horizontal
3. In surveys of large extent, the effect of curvature of the earth must be considered
4. All the above

View answer

195. Pick up the incorrect statement from the following:

1. While measuring a distance with a tape of length 100.005 m, the distance to be increasing by 0.005 m for each tape length
2. An increase in temperature causes a tape to increase in length and the measured distance is too large
3. The straight distance between end points of a suspended tape is reduced by an amount called the sag correction
4. A 100 m tape of cross section 10 mm × 0.25 mm stretches about 10 mm under 5 kg pull

View answer

196. Pick up the method of surveying in which field observations and plotting proceed simultaneously from the following

1. Chain surveying
2. Compass surveying
3. Plan table surveying
4. Tacheometric surveying

View answer

197. Planimeter is used for measuring

1. Volume
2. Area
3. Contour gradient
4. Slope angle

View answer

198. Prismatic compass is considered more accurate than a surveyor's compass, because

1. It is provided with a better magnetic needle
2. It is provided with a sliding glass in the object vane
3. Its graduations are in whole circle bearings
4. It is provided with a prism to facilitate reading of its graduated circle

View answer

199. Probable accidental error in precise levelling as recommended by International Geodetic Association should not exceed (where k is in kilometers.)

1. ± 0.1 √k mm
2. ± 0.5 √k mm
3. ± 1 √k mm
4. ± 5 √k mm

View answer

200. Probable systematic error in precise levelling as recommended by International Geodetic Association should not exceed (where 'k is in kilometers.)

1. ± 0.1 √k mm
2. ± 0.2 √k mm
3. ± 0.1 √k
4. 0.2 √k mm

View answer