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Current Affairs January 2024

What is the correct answer?

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°

Correct Answer :

B. Is a function of tilt


Related Questions

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4

The great circle whose plane is perpendicular to the axis of rotation of the earth, is called

A. Equator

B. Terrestrial equator

C. 0° latitude

D. All the above

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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

A star may culminate at zenith if its declination is

A. Greater than the longitude of the place

B. Less than the latitude of the place

C. Equal to the latitude of the place

D. None of these

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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

The scale of a vertical photograph of focal length f taken from height of H metres above M.S.L., at a point of reduced level h, is

A. f/H

B. f/(H + h)

C. f/(H - h)

D. (H - h)/f

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4

If f is the focal length of the camera lens and θ is the angle of tilt, the distance of the plumb point from the principal point will be

A. f sin θ

B. f cos θ

C. f tan θ

D. f sec θ

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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

The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

A. Rational horizon

B. True horizon

C. Celestial horizon

D. All the above

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4

The main object of the astronomer to obtain

A. Astronomical latitude

B. Astronomical longitude

C. Astronomical bearing

D. All of these

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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

The slotted template method

A. Is prepared, by graphical method

B. Is suitable for large areas with less control

C. Is rapid and accurate

D. All the above

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4

The distance between the minor control point and the principal point should be equal to

A. Base line of the left photograph of stereo pair

B. Base line of the right photograph of stereo pair

C. Sum of the base lines of stereo pair

D. Mean of the base lines of the stereo pair

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4

If α is the observed altitude, the refraction correction in seconds, is

A. 58 cot α

B. 58 tan α

C. 58 sin α

D. 58 cos α

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4

With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

A. 7 h 00 m

B. 7 h 30 m

C. 8 h 00 m

D. 9 h 00 m

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4

If the general ground level of any area is 10% of the flying height, the principal points may be used as the centres of radial directions for small scale mapping even in tilted photograph up to

A.

B.

C.

D.

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4

The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is

A. 500 m

B. 1000 m

C. 1500 m

D. 2000 m

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4

Triangulation surveys are carried out for locating

A. Control points for surveys of large areas

B. Control points for photogrammetric surveys

C. Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.

D. All the above

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4

The following points form a pair of homologous points:

A. Photo principal point and ground principal point

B. Photo isocenter and ground isocenter

C. Photo plumb point and ground plumb point

D. All the above

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4

The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is

A. 5100 nautical miles

B. 5700 nautical miles

C. 120 nautical miles

D. 500 nautical miles

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4

The correction applied to the measured base of length L is

A. Tension = (P - Ps)L/AE

B. Sag = L3w²/24P² where w is the weight of tape/m

C. Slope = (h²/2L) + (h4/8L3) where h is height difference of end supports

D. All the above

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4

The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

A. 0.01 second

B. 0.001 second

C. 0.0001 second

D. None of these

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4

In a spherical triangle ABC, right angled at C, sin b equals

A. sin a cos A

B. cos a sin A

C. tan a cot A

D. cot A tan a

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4

Pick up the correct statement from the following:

A. The angle between the plane of the negative and the horizontal plane containing perspective axis is the tilt of the photograph

B. The direction of maximum tilt is defined by the photo principal line

C. The principal plane is truly vertical plane which contains perspective centre as well as principal point and plumb point

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

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

The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:

A. Mean sun

B. True sun

C. Vernal equinox

D. All the above

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4

For any star to be a circumpolar star, its

A. Declination must be 0°

B. Declination must be 90°

C. Distance from the pole must be less than the latitude of the observer

D. Hour angle must be 180°

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4

If δ is the declination of the star and φ is the latitude of the observer then the hour angle of the star at elongation is given by

A. sin H = tan φ . cot δ

B. cos H = tan φ . cot δ

C. tan H = tan φ . cot δ

D. None of these

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4

The difference of height of two points whose parallax difference is 0.8 mm on a pair of stereo pair taken from a height H is 100 m. If mean photo base is 95.2 mm, the flying height is

A. 8,000 m

B. 10,000 m

C. 12,000 m

D. 14,000 m

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4

If the equatorial distance between two meridians is 100 km, their distance at 60° latitude will be

A. 1000 km

B. 800 km

C. 600 km

D. 500 km