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Q1. | Prolongation of chain line across an obstruction in chain surveying, is done by. |

A. | making angular measurements [Wrong Answer] |

B. | drawing perpendiculars with a chain [Correct Answer] |

C. | solution of triangles [Wrong Answer] |

D. | all the above. [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ From any point on the surface with a given inclination.

only one contour gradient is possible

two contour gradients are possible

indefinite contour gradients are possible

all the above.

⇒ The difference in the lengths of an arc and its subtended chord on the earth surface for a distance of 18.2 km, is only.

1 cm

5 cm

10 cm

100 cm.

⇒ In levelling operation.

when the instrument is being shifted, the staff must not be moved

when the staff is being carried forward, the instrument must remain stationary

both (a) and (b)

neither (a) nor (b).

⇒ The representation of general topography of a very flat terrain is possible only.

by drawing contours at large interval

by drawing contours at small interval

by giving spot levels at large interval

by giving spot levels to salient features at close interval.

⇒ The direction of a line relative to a given median is called

Angular direction

Bearing

Deviation

Inclination

⇒ One of the tacheometric constants is additive, the other constant, is.

subtractive constant

multiplying constant

dividing constant

indicative constant.

⇒ Normal tension is that pull which

is used at the time of standardising the tape

neutralizes the effect due to pull and sag

makes the correction due to sag equal to zero

makes the correction due to pull equal to zero

⇒ The conventional sign shown in below figure represents a

bridge carrying railway below road

bridge carrying road below railway

bridge carrying road and railway at the same level

a level crossing.

⇒ An ideal transition curve is.

cubic parabola

cubic spiral

clothoid spiral

true spiral.

⇒ Diaphragm of a surveying telescope is held inside.

eye-piece

objective

telescope tube at its mid point

telescope at the end nearer the eye-piece

⇒ In the prismatic compass

the magnetic needle moves with the box

the line of the sight does not move with the box

the magnetic needle and graduated circle do not move with the box

the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction

⇒ Determining the difference in elevation between two points on the surface of the earth, is known as.

levelling

simple levelling

differential levelling

longitudinal levelling.

⇒ The error due to bad ranging is

Compensation

Cumulative positive

Cumulative negative

Both (B) and (C) above

⇒ Which of the following methods of plane table surveying is used to locate the position of an inaccessible point ?

radiation

intersection

traversing

resection

⇒ When the plane table is not correctly oriented, the resectors will

Meet at a point

Form a triangle

Either of the above

None of the above

⇒ During secular variation of magnetic meridian at different places.

range of oscillations is constant

period of oscillation is constant

range and period of oscillation both vary

period of oscillation only varies.

⇒ Which of the following errors cannot be eliminated by taking both face observations ?

error due to horizontal axis not being perpendicular to the vertical axis

index error i.e. error due to imperfect adjustment of the vertical circle vernier

error due to non-parallelism of the axis of telescope level and line of collimation

none of the above

⇒ The type of surveying which requires least office work is

tacheomefry

trigonometrical levelling

plane table surveying

theodolite surveying

⇒ Pick up the correct statement from the following :

spherical aberration may be reduced by diminishing the aperture

spherical aberration may be minimised by replacing the single lens by a combination of the lenses.

in telescope objectives, a combination of convex lens and concave lens is used.

all the above.

⇒ A'level line'is a

horizontal line

line parallel to the mean spheriodal surface of earth

line passing through the center of cross hairs and the center of eye piece

line passing through the objective lens and the eye-piece of a dumpy or tilting level

⇒ If the angular measurements of a traverse are more precise than its linear measurements, balancing of the traverse, is done by.

Bowditch's rule

Transit rule

Empirical rule

all of the above.

⇒ Perpendicularity of an offset may be judged by eye, if the length of the offset is.

5 m

10 m

15 m

20 m

⇒ The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known.

declination

azimuth

dip

bearing.

⇒ Ranging in chain survey means.

looking at an isolated point not on the line

establishing an intermediate point on the line

determining the distance between end points

determining the offset distance

⇒ The combined effect of curvature and refraction over a distance

*L*kilometres is.

67.2 L2 mm

76.3 L2 mm

64.5 L2 mm

none of these.

⇒ Ramsden eye-piece consists of.

two convex lenses short distance apart

two concave lenses short distance apart

one convex lens and one concave lens short distance apart

two plano-convex lenses short distance apart, with the convex surfaces facing each other.

⇒ A clinometer is used for.

measuring angle of slope

correcting line of collimation

setting out right angles

defining natural features.

⇒ If the length of a chain line along a slope of θ° is

*l*, the required slope correction is.

2l cos2 Î¸/2

2l sin2 Î¸/2

l tan2 Î¸/2

l cos2 Î¸/2.

⇒ To orient a plane table at a point with two inaccessible points, the method generally adopted, is.

intersection

resection

radiation

two point problem.

⇒ If 'n' is the number of sides, then the total sum of interior angles of a closed traverse should be

n + 2

2n - 4

2n + 4

4n - 2