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
- (D) Radial
acceleration
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