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What is the correct answer?

4

The point where vertical line passing through the perspective centre intersects the plane of the photograph, is known as

A. Photo plumb point

B. Plumb point

C. Nadir point

D. Isocenter

Correct Answer :

A. Photo plumb point


Related Questions

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4

Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

A. By subtracting their longitudes if places are in the same hemisphere

B. By adding their longitudes if places are in the different hemispheres

C. By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres

D. All the above

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4

The position of a heavenly body on the celestial sphere can be completely specified by

A. Its altitude and azimuth

B. Its declination and hour angle

C. Its declination and right ascension

D. All the above

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4

For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through

A. Isocenter

B. Plumb point

C. Principal point

D. None of these

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4

In a tropical year, the numbers of sidereal days are

A. 365

B. 365.2224

C. 365.2422

D. 366.2422

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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 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 orthogonal projection of the perspective centre on a tilted photograph, is called

A. Nadir

B. Isocenter

C. Principal point

D. Plumb point

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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

The net ground area of a vertical photograph 20 cm × 20 cm on scale 1 : 10,000 having overlaps 60% and 30%, is

A. 0.50 sq km

B. 0.56 sq km

C. 0.60 sq km

D. 0.64 sq km

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4

The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

A. Horizon and equator

B. Zenith and pole

C. Equator and zenith

D. Pole and horizon

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4

The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

A. 4.4 mm

B. 5.5 mm

C. 6.5 mm

D. 7.5 mm

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4

In a truly vertical photograph,

A. Principal point coincides the isocenter

B. Iso-centre coincides the plumb point

C. Plumb point coincides the principal point

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 value of geo-centric parallax to be added to the observed altitude of sun is

A. 9 cos α

B. 9 sin α

C. 9 tan α

D. 9 cot α

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4

The nautical mile is the length of

A. 1 minute of latitude

B. 1 minute of longitude

C. 1 degree of latitude

D. 1 degree of longitude

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4

The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

A. B = bH/f

B. B =f/bH

C. B = b/fH

D. B = H/bf

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4

Polaris is usually observed for the determination of the azimuth when it is

A. At culmination

B. At elongation

C. Neither at culmination nor at elongation

D. Either at culmination or at elongation

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4

If θ and δ be the latitude of a place and declination of a star respectively, the upper culmination of the star will be north of zenith if its zenith distance, is

A. δ - θ

B. θ - δ

C. θ + δ

D. (θ + δ)/2

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4

The declination and right ascension of the sun becomes 23° 27' N and 90° respectively on

A. March 21

B. June 21

C. September 21

D. December 22

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4

The station which is selected close to the main triangulation station, to avoid intervening obstruction, is not known as

A. Satellite station

B. Eccentric station

C. False station

D. Pivot station

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4

Limiting gradient for locating the base line on evenly-sloping ground, is

A. 1 in 12

B. 1 in 10

C. 1 in 8

D. 1 in 6

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4

Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

A. Once

B. Twice

C. Thrice

D. Four times

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4

Pick up the correct statement from the following:

A. Refraction correction is zero when the celestial body is in the zenith

B. Refraction correction is 33' when the celestial body is on the horizon

C. Refraction correction of celestial bodies depends upon their altitudes

D. All the above

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4

Perspective centre relates to

A. Parallel projection

B. Orthogonal projection

C. Central projection

D. None of these

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4

The true and mean suns occupy the same meridian at the same time on

A. April 15

B. June 14

C. September 1

D. All the above

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4

α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being S and f respectively. Parallax displacement of the point due to relief, is

A. h tan α/S

B. h tan β/S

C. h (tan α + tan β)/S

D. h (tan α - tan β)/S

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4

The declination and right ascension of the sun becomes 23° 27' S and 270° respectively on

A. March 21

B. June 21

C. September 21

D. December 22

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4

Pick up the correct statement for horizontal photographs.

A. Parallel lines do not appear parallel in central projection

B. The two sides of a road meet at the vanishing point

C. The lines parallel to the negative plane are projected as parallel lines

D. All the above

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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 point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

A. Principal point

B. Isocenter

C. Plumb point

D. Perspective centre