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Current Affairs January 2024

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4

Pick up the incorrect statement from the following:

A. In truly vertical photographs without relief angles are true at the plumb point

B. In tilted photographs without relief, angles are true at the iso-centre

C. In tilled photographs with relief, angles are true at the principal point

D. None of these

Correct Answer :

C. In tilled photographs with relief, angles are true at the principal point


Related Questions

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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

The parallax equation Δp = BmΔh/H - h is applicable to entire overlap of the photographs only if parallax is measured

A. Normal to base line

B. Parallel to base line

C. Both (a) and (b)

D. Neither (a) nor (b)

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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

The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is

A. 22° 30'

B. 23° 27'

C. 23° 30'

D. 24° 0'

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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

A nautical mile is

A. One minute arc of the great circle passing through two points

B. One minute arc of the longitude

C. 1855.109 m

D. All the above

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4

The point at which sun's declination changes from north to south, is known as

A. First point of Aeries

B. First point of Libra

C. Vernal Equinox

D. Both (b) and (d) of the above

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4

Pick up the correct statement from the following:

A. The measured stereoscopic base of photographs is obtained by dividing the air base in metres by the mean scale of the photograph

B. The difference between the absolute parallax of two points depends upon the difference in their elevations

C. The line joining the principal point of a photograph and the transferred principal point of the adjoining photograph, is called stereoscopic base

D. All the above

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4

For adjusting a quadrilateral whose both the diagonals are observed, the equations of conditions involved, are

A. Two angle equations and two side equations

B. One angle equation and three side equations

C. Three angle equations and one side equation

D. None of these

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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

The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as

A. Isocenter

B. Principal point

C. Perspective centre

D. Plumb line

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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

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

The solar tidal force divided by lunar tidal force is

A. 1/3

B. 1/2

C. 3/4

D. 5/4

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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

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

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 altitude of a heavenly body is its angular distance, measured on the vertical circle passing through the body, above

A. Equator

B. Horizon

C. Pole

D. None of these

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4

The average eye base is assumed as

A. 58 mm

B. 60 mm

C. 62 mm

D. 64 mm

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4

Assuming human normal vision distance 25 cm, smallest measurable angle 20, and intraocular distance 6.5 cm, the smallest depth to be discerned is

A. 0.1 mm

B. 0.5 mm

C. 1.00 mm

D. 1.1 mm

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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

Polaris is usually observed for the determination of the latitude 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

At lower culmination, the pole star moves

A. Eastward

B. Westward

C. Northward

D. Southward

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4

If a star whose declination is 60° N culminates at zenith, its altitude at the lower culmination, is

A. 10°

B. 20°

C. 30°

D. 40°

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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 altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The latitude of the place, is

A. 80°

B. 70°

C. 60°

D. 40°

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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

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4

If E is the spherical excess and R the radius of the earth, the surface area of the triangle, is

A. πR²E/90°

B. πR²E/180°

C. πR²E/270°

D. πR²E/360°

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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

Rotation of the camera at exposure about horizontal axis normal to the line of flight, is known as

A. Swing

B. Tilt

C. Tip

D. None of these