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1) If a tripod settles in the interval that elapses between taking a back sight reading and the following foresight reading, then the elevation of turning point will_________________? a. increase b. decrease c. not change d. either ‘a’ or ‘b’
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2) In the double application of principle of reversion, the apparent error is_______________? a. equal to true error b. half the true error c. two times the true error d. four times the true error
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3) Which of the following errors cannot be eliminated by taking both face observations ? a. error due to horizontal axis not being perpendicular to the vertical axis b. index error i.e. error due to imperfect adjustment of the vertical circle vernier c. error due to non-parallelism of the axis of telescope level and line of collimation d. none of the above
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4) Theodolite is an instrument used for_________________? a. tightening the capstan-headed nuts of level tube b. measurement of horizontal angles only c. measurement of vertical angles only d. measurement of both horizontal and vertical angles
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5) If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to_________________?
1. altitude bubble on index frame 2. altitude bubble on index frame if it is to be used as a level 3. altitude bubble on telescope 4. altitude bubble on telescope if it is to be used as a level The correct answer is? a. only (1) b. both (1) and (4) c. only (3) d. both (2) and (3)
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6) Which of the following errors can be eliminated by taking mean of bot face observations ? a. error due to imperfect graduations b. error due to eccentricity of verniers c. error due to imperfect adjustment of plate levels d. error due to line of collimation not being perpendicular to horizontal axis
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7) The following sights are taken on a “turning point”________________? a. foresight only b. backsight only c. foresight and backsight d. foresight and intermediate sight
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8) If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is_________________? a. 99.345 m b. 100.345 m c. 100.655m d. 101.870m
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9) As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be________________? a. 98.70 b. 100.00 c. 102.30 d. 103.30
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10) Refraction correction________________? a. completely eliminates curvature correction b. partially eliminates curvature correction c. adds to the curvature correction d. has no effect on curvature correction
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11) The sensitivity of a bubble tube can be increased by________________? a. increasing the diameter of the tube b. decreasing the length of bubble c. increasing the viscosity of liquid d. decreasing the radius of curvature of tube
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12) If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be_______________? a. true R.L b. more than true R.L c. less than true R.L d. none of the above
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13) Which of the following errors can be neutralised by setting the level midway between the two stations ? a. error due to curvature only b. error due to refraction only c. error due to both curvature and re-fraction d. none of the above
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14) The rise and fall method_______________? a. is less.accurate than height of instrument method b. is not suitable for levelling with tilting levels c. provides a check on the reduction of intermediate point levels d. quicker and less tedious for large number of intermediate sights
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15) The difference between a level line and a horizontal line is that_______________? a. level line is a curved line while hori-zontal line is a straight line b. level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line c. horizontal line is normal to plumb line while level line may not be normal to the plumb line d. both are same
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16) With the rise of temperature, the sensitivity of a bubble tube______________? a. decreases b. increases c. remains unaffected d. none of the above
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17) The R.L, of the point A which is on the floor is 100 m and back sight reading on A is 2.455 m. If the foresight reading on the point B which is on the ceiling is 2.745 m, the R.L. of point B will be_______________? a. 94.80 m b. 99.71 m c. 100.29 m d. 105.20 m
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18) If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to_______________? a. d b. 1/d c. d2 d. 1/d2
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19) The suitable contour interval for a map with scale 1 : 10000 is______________? a. 2 m b. 5m c. 10 m d. 20 m
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20) Contour interval is_______________? a. inversely proportional to the scale of the map b. directly proportional to the flatness of ground c. larger for accurate works d. larger if the time available is more
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