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

With the rise of temperature, the sensitivity of a bubble tube______________?

A. Decreases
B. Increases
C. Remains unaffected
D. None of the above

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

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

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

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

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

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

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

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