# 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**

*V*^{2}/*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 (2*l*) joining two grades*g*_{1}% and -*g*_{2}%, the height of the apex will be- (A) (

*S*-

*l*)/400 × (

*g*

_{1}

*- g*

_{2})

- (B) (

*g*

_{1}

*- g*

_{2})/400

- (C) (

*g*

_{1}

*- g*

_{2})

*S*

^{2}/1600

*l*

- (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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