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66. The suitable contour interval for a map with scale 1 : 10000 is

A. 2 m

B. 5m

C. 10 m

D. 20 m

Explanation:

67. 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

Explanation:

68. 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

Explanation:

69. 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

Explanation:

70. The correction for sag is

A. always additive

B. always subtractive

C. always zero

D. sometimes additive and sometimes subtractive

Explanation:

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