Answer: d2

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Questions

41
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

Answer: d2

42
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

Answer: 105.20 m

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45
The sensitivity of a bubble tube can be increased by

Answer: increasing the diameter of the tube

46
The difference between a level line and a horizontal line is that

Answer: level line is a curved line while horizontal line is a straight line

47
the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

Answer: less than true R.L.

48
The rise and fall method

Answer: provides a check on the reduction of intermediate point levels

49
Height of instrument method of levelling is

Answer: quicker and less tedious for large number of intermediate sights

50
Which of the following errors can be neutralised by setting the level midway between the two stations ?

Answer: error due to both curvature and re-fraction

52
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

Answer: 99.345 m

53
The rise and fall method of levelling provides a complete check on

Answer: all of the above

56
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

i) altitude bubble on index frame

ii) altitude bubble on index frame if it is to be used as a level

iii) altitude bubble on telescope

iv) altitude bubble on telescope if it is to be used as a level The correct answer is

Answer: both (i) and (iv)

57
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

Answer: increase

58
Which of the following errors cannot be eliminated by taking both face observations ?

Answer: none of the above

59
Which of the following errors can be eliminated by taking mean of bot face observations ?

Answer: error due to line of collimation not being perpendicular to horizontal axis