Surveying and Levelling

71. For high sensivity of the bubble tube

1. A liquid of low viscosity is used
2. A liquid of low surface tension is used
3. The bubble space should be long
4. All the above

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72. For indirect ranging, number of ranging rods required, is

1. 1
2. 2
3. 3
4. 4

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73. For locating a distant object visible from two transit stations, the method usually preferred to, is

1. Angles and distances from transit stations
2. Angles from two transit stations
3. Distance from two transit stations
4. Angle from one transit station and distance from the other

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74. For orientation of a plane table with three points A, B and C, Bessel's drill is

1. Align B through A and draw a ray towards C, align A through B and draw A ray towards C, finally align C through the point of intersection of the previously drawn rays
2. Align C through A and draw a ray towards B, align A through C and draw A ray towards B, finally align B through the point of intersection of the previously drawn rays
3. Align c through B and draw a ray towards A, align B through C and draw A ray towards A, finally align A, through the point of intersection of the previously, drawn rays
4. In the first two steps any two of the points may be used and a ray drawn towards the third point, which is sighted through the point of intersection of previously drawn rays in the final step.

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75. For preparation of a contour plan for a route survey

1. Method of squares is used
2. Method of trace contour is used
3. Method of cross profile is used
4. Indirect method of contouring is used

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76. For setting out a simple curve, using two theodolites.

1. Offsets from tangents are required
2. Offsets from chord produced are required
3. Offsets from long chord are required
4. None of these

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77. For taking offsets with an optical square on the right hand side of the chain line, it is held

1. By right hand upside down
2. By left hand upright
3. By right hand upright
4. By left hand upside down

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78. For the construction of highway (or railway)

1. Longitudinal sections are required
2. Cross sections are required
3. Both longitudinal and cross sections are required
4. None of these

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79. For true difference in elevations between two points 'A' and 'B', the level must be set up

1. At any point between A and B
2. At the exact midpoint of A and B
3. Near the point A
4. Near the point B

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80. From any point on the surface with a given inclination

1. Only one contour gradient is possible
2. Two contour gradients are possible
3. Indefinite contour gradients are possible
4. All of the above

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