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4

In triangulation surveys

A. The area is divided into triangular figures

B. Control stations are located from which detailed surveys are carried out

C. Sides are not measured excepting the base line

D. All the above

Correct Answer :

D. All the above


Related Questions

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4

The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is

A. f/H sec θ

B. f sec θ/H

C. f/H

D. f/H cos ½θ

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4

The coverage is least if photography is

A. High oblique

B. Low oblique

C. Vertical

D. None of these

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4

The flying height of the camera is 1, 000 m above mean ground level, the distance of the top of a building from a nadir point is 10 cm and the relief displacement of building is 7.2 mm. The height of the building, is

A. 52 m

B. 62 m

C. 72 m

D. 82 m

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4

The necessary geometrical condition for triangulation adjustment is:

A. The sum of the angles around a station should be 360°

B. The sum of the three angles of a plane triangle should be 180°

C. The sum of the eight angles of a braced quadrilateral should be 360°

D. All the above

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4

The moon rotates round the earth once in every

A. 29 days

B. 29.35 days

C. 29.53 days

D. 30 days

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4

If the distance between the projectors is altered by a movement along X-axis of one projector,

A. The length of the air base is increased

B. The scale of the model is altered

C. y-parallax is not affected

D. All the above

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4

The angle between the observer's meridian and declination circle of a heavenly body, is known as

A. Hour angle

B. Azimuth

C. Right ascension

D. Declination

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4

The rate of change of parallax dp/dh with respect to change in h, may be expressed as

A. fB/(H - h)

B. fB/(H - h)2

C. fB/(H + h)

D. fB/(H + h)2

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4

The Polaris remains below horizon at

A. 10° N

B. 50° N Latitude

C. Equator

D. 5° S latitude

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4

The zenith is the point on the celestial sphere

A. East of observer

B. West of observer

C. North of observer

D. South of observer

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4

Longitude of a place is the angular distance between the meridian of the place and

A. The standard meridian

B. The international date line

C. That of Greenwich

D. Both (a) and (c) of above

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4

Triangulation surveys are carried out for providing

A. Planimetric control

B. Height control

C. Both planimetric and height control

D. None of these

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4

The height displacement on a vertical photograph

A. Increases as the horizontal distance increases from the principal point

B. Increases as the ground elevation increases

C. Decreases as the flying height increases

D. All the above

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4

The angle between the direction of star and the direction of earth's axis of rotation is called

A. Co-declination

B. Co-latitude

C. Declination

D. Latitude

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4

Pick up the correct statement from the following:

A. The principal point coincides with plumb point on a true vertical photograph

B. The top of a hill appears on a truly vertical photograph at greater distance than its bottom from the principal point

C. The top of a hill is represented on a vertical photograph at larger scale than the area of a nearby valley

D. All the above

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4

A star is said to elongate

A. When the star momentarily moves vertically

B. When the angle at the star of the spherical triangle is 90°

C. When the star's declination is greater than the observer's latitude

D. All the above

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4

Pick up the in-correct statement from the following:

A. Apparent solar time is measured from the lower transit of the true sun

B. Mean solar time is measured from the lower transit of the mean sun

C. Sidereal time is measured from the lower transit of the first point of Aries

D. Sidereal time is measured from the upper transit of the first point of Aries

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4

The maximum error in radial line assumption, is

A. h/H f tan θ

B. h/H f² tan θ

C. h/H f² sin θ

D. h/H f cos θ

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4

The shortest distance between two places measured along the surface of the earth, is

A. Length of the equator between their longitudes

B. Length of the parallel between their longitudes

C. Length of the arc of the great circle passing through them

D. None of these

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4

The want of correspondence in stereo-photographs

A. Is a good property

B. Is a function of tilt

C. Is not affected by the change of flying height between photographs

D. Is minimum when θ is 3°

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4

At upper culmination, the pole star moves

A. Eastward

B. Westward

C. Northward

D. Southward

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4

The parallax of a point on the photograph is due to

A. Ground elevation

B. Flying height

C. Length of air base

D. All the above

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4

To have greatest coverage of the area, the type of photography used, is

A. High oblique

B. Low oblique

C. Vertical

D. None of these

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4

If S is the sum of three angles of a spherical triangle, the spherical excess equals

A. S - 90°

B. S - 180°

C. S - 270°

D. S - 360°

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4

Pick up the correct statement from the following:

A. The plane passing through the perspective centre of a stereo pair and a ground point, is known as basal plane

B. Each pair of image points on stereo pair have their own basal plane

C. Relative orientation means reconstructing the basal plane

D. All the above

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4

On vertical photographs, height displacement is

A. Positive for points above datum

B. Negative for points below datum

C. Zero for points vertically below the air station

D. All the above

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4

The point on the celestial sphere vertically below the observer's position, is called

A. Zenith

B. Celestial point

C. Nadir

D. Pole

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4

Pick up the incorrect statement from the following. In a spherical triangle

A. Every angle is less than two right angles

B. Sum of the three angles is equal to two right angles

C. Sum of the three angles less than six right angles and greater than two right angles

D. Sum of any two sides is greater than the third

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4

The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by

A. sin λ

B. cos λ

C. tan λ

D. cot λ

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4

A plate parallel is the line on the plane of the negative

A. Parallel to the principal line

B. Perpendicular to the principal line

C. Along the bisector of the angle between the principal line and a perpendicular line through principal plane

D. None of these