# Practice Test: Question Set - 19

**1. It ‘θ’ is the probable error of an observed bearing of a line of length ‘**

*l’*, the error over the whole length of the traverse of ‘*n’*lines of length ‘*l’*is- (A)

*l*√

*n*

- (B)

*n*(θ/

*l) √n*

- (C) θ ∛n

- (D) ⅓ θ √

*n*

**2. The magnetic meridian at any point, is the direction indicated by a freely suspended**

- (A) Magnetic
needle

- (B) And
properly balanced magnetic needle

- (C) Properly
balanced and uninfluenced by local attractive force

- (D) Magnetic
needle over an iron pivot

**3. Bergschrund is a topographical feature in**

- (A) Plains

- (B) Water
bodies

- (C) Hills

- (D) Glaciated
region

**4. If Δ is the angle of deflection of a simple curve of radius**

*R*, the distance between the mid-point of the curve and long chord, is- (A)

*R*(1 - sin Δ/2)

- (B)

*R*(1 + sin Δ/2)

- (C)

*R*(1 + cos Δ/2)

- (D)

*R*(1 - cos Δ/2)

**5. A relatively fixed point of known elevation above datum, is called**

- (A) Bench mark

- (B) Datum
point

- (C) Reduced
level

- (D) Reference
point

**6. The power of a lens**

- (A) Is
reciprocal of its focal length

- (B) Is positive
if it is a convex lens

- (C) Is
negative if it is a concave lens

- (D) Is
measured in Diopter

**7. The approximate formula for radial or perpendicular offsets from the tangent, is**

- (A)

*x*/2

*R*

- (B)

*x*

^{2}/2

*R*

- (C)

*x*/

*R*

- (D)

*x*

^{2}/

*R*

**8. The included angles of a theodolite traverse, are generally measured**

- (A) Clockwise
from the forward station

- (B) Anti-clockwise
from the back station

- (C) Anti-clockwise
from the forward station

- (D) Clockwise
from the back station

**9. The intercept of a staff**

- (A) Is
maximum if the staff is held truly normal to the line of sight

- (B) Is
minimum if the staff is held truly normal to the line of sight

- (C) Decreases
if the staff is tilted away from normal

- (D) Increases if
the staff is tilted towards normal

**10. In a constant level tube, size of the bubble remains constant because upper wall is**

- (A) Of
relatively larger radius

- (B) Of
relatively smaller radius

- (C) Flat

- (D) Convex
downwards

**11. While measuring the distance between two points along upgrade with the help of a 20 m chain, the forward end of the chain is shifted forward through a distance**

- (A) 20 (sinθ -
1)

- (B) 20 (cosθ -
1)

- (C) 20 (secθ -
1)

- (D) 20 (cosecθ -
1)

**12. Contours of different elevations may cross each other only in the case of**

- (A) An
overhanging cliff

- (B) A vertical
cliff

- (C) A saddle

- (D) An inclined
plane

**13. Diopter is the power of a lens having a focal length of**

- (A) 25 cm

- (B) 50 cm

- (C) 75 cm

- (D) 100 cm

**14. A theodolite is said to be in perfect adjustment if**

- (A) Rotation
axis is vertical to the transit axis

- (B) Transit
axis is perpendicular to line of collimation

- (C) Line
of collimation sweeps out a vertical plane while the telescope is elevated or
depressed

- (D) All the
above

**15. In chain surveying, perpendiculars to the chain line are set out by**

- (A) A
theodolite

- (B) A
prismatic compass

- (C) A level

- (D) An
optical square

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