Online Practice Civil Engineering Surveying - Set 23 - ObjectiveBooks
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# Practice Test: Question Set - 23

1. The angle between two plane mirrors of optical square, is
(A) 20°
(B) 30°
(C) 45°
(D) 60°

2. With usual notations, the expression V2/gR represents
(A) Centrifugal force
(B) Centrifugal ratio
(C) Super elevation

3. Profile levelling is usually done for determining
(A) Contours of an area
(B) Capacity of a reservoir
(C) Elevations along a straight line
(D) Boundaries of property

4. Keeping the instrument height as 1½ m, length of staff 4 m, the up gradient of the ground 1 in 10, the sight on the up slope must be less than
(A) 25 cm
(B) 20 m
(C) 45 m
(D) 10 m

5. Perpendicularity of an offset may be judged by eye, if the length of the offset is
(A) 5 m
(B) 10 m
(C) 15 m
(D) 20 m

6. You have to observe an included angle with better accuracy than what is achievable by a vernier, you will prefer the method of
(A) Repetition
(B) Reiteration
(C) Double observations
(D) Exactness

7. If the sight distance (S) is equal to the length of the vertical-curve (2l) joining two grades g1% and -g2%, the height of the apex will be
(A) (S - l)/400 × (g1 - g2)
(B) (g1 - g2)/400
(C) (g1 - g2)S2/1600l
(D) None of these

8. If the radius of a simple curve is 600 m, the maximum length of the chord for calculating offsets, is taken
(A) 15 m
(B) 20 m
(C) 25 m
(D) 30 m

9. Subtense tacheometry is generally preferred to if ground is
(A) Flat
(B) Undulating
(C) Mountainous
(D) Deserts

10. The area of a plane triangle ABC, having its base AC and perpendicular height ‘h’, is
(A) ½ bh
(B) ½ ba sin C
(C) ½ bc sin A
(D) All the above

11. In reciprocal levelling, the error which is not completely eliminated, is due to
(A) Earth's curvature
(B) Non-adjustment of line of collimation
(C) Refraction
(D) Non-adjustment of the bubble tube

12. The first reading from a level station is
(A) Foresight
(B) Intermediate sight
(C) Back-sight
(D) Any sight

13. If ‘S’ is the length of a sub-chord and ‘R’ is the radius of simple curve, the angle of deflection between its tangent and sub-chord, in minutes, is equal to
(A) 573 S/R
(B) 573 R/S
(C) 1718.9 R/S
(D) 1718.9 S/R

14. While rotating the theodolite in the horizontal plane, the bubble of the bubble tube takes up the same position in its tube, it indicates
(A) The rotation axis is vertical
(B) The trunnion axis is horizontal
(C) The line of collimation is perpendicular to vertical axis
(D) None of the above

15. The slope correction for a 3° slope for a length of 100 m, is
(A) -0.11 m
(B) -0.12 m
(C) -1.87 m
(D) -0.137 m

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