Surveying and Levelling

41. Centering error of a theodolite produces an error

1. In all angles equally
2. Which does not vary with the direction or pointing
3. Which varies with the direction of pointing and inversely with the length of sight
4. None of these

View answer

42. Chain surveying is well adopted for

1. Small areas in open ground
2. Small areas with crowded details
3. Large areas with simple details
4. Large areas with difficult details

View answer

43. Check lines (or proof lines) in Chain Surveying, are essentially required

1. To plot the chain lines
2. To plot the offsets
3. To indicate the accuracy of the survey work
4. To increase the out-turn

View answer

44. Closed contours of decreasing values towards their centre, represent

1. A hill
2. A depression
3. A saddle or pass
4. A river bed

View answer

45. Closed contours, with higher value inwards, represent a

1. Depression
2. Hillock
3. Plain surface
4. None of the above

View answer

46. Contour interval is

1. Inversely proportional to the scale of the map
2. Directly proportional to the flatness of ground
3. Larger for accurate works
4. Larger if the time available is more

View answer

47. Contour lines of different elevations can unite to form one line, only in the case of

1. A vertical cliff
2. A saddle
3. A water shed line
4. A hill top

View answer

48. Contours of different elevations may cross each other only in the case of

1. An overhanging cliff
2. A vertical cliff
3. A saddle
4. An inclined plane

View answer

49. Correct distance obtained by an erroneous chain is:

1. (Erroneous chain length/Correct chain length) × Observed distance
2. (Correct chain length/Erroneous chain length) × Observed distance
3. (Correct chain length/Observed distance) × Erroneous chain length
4. None of these

View answer

50. Correction per chain length of 100 links along a slope having a rise of 1 unit in horizontal units, is

1. 100/n²
2. 100 n²
3. 100/n³
4. 100/n

View answer