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Current Affairs January 2024

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4

The time interval between successive transits of the moon, is

A. 24 hours 10 minutes

B. 20 hours 25 minutes

C. 24 hours 50 minutes

D. 23 hours 50 minutes

Correct Answer :

C. 24 hours 50 minutes


Related Questions

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4

Sidereal day

A. Is the period of time taken by the earth in making a complete rotation with reference to stars

B. Is slightly shorter than an ordinary solar day

C. Is divided into the conventional hours, minutes and seconds

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

The great circle which passes through the zenith, nadir and the poles, is known as

A. Meridian

B. Vertical circle

C. Prime vertical

D. None of these

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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

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

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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 coverage is least if photography is

A. High oblique

B. Low oblique

C. Vertical

D. None of these

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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 meridian of a place is

A. A great circle passing through the place and the poles

B. A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place

C. A semi-circle which passes through the place and is terminated at the poles

D. An arc of the great circle which passes through the place and is perpendicular to the equator

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4

If 16 flight lines are run perpendicular to an area 30 km wide, their spacings on a photographical map on scale 1 : 50,000 , will be

A. 1 cm

B. 2 cm

C. 3 cm

D. 4 cm

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4

The latitude of the observer's position, is

A. Elevation of the elevated pole

B. Declination of the observer's zenith

C. Angular distance along the observer's meridian between equator and the observer

D. All the above

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4

The elevation of the star at elongation is obtained by

A. sin α = sin φ cosec δ

B. sin α = sin φ sec δ

C. sin α = cos φ sec δ

D. sin α = cos φ cosec δ

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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 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

Stellar astronomy deals with

A. Plane surveying

B. Geodetic surveying

C. Star observations

D. Planet observations

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4

If the altitudes of a star at its upper and lower transits are 60° 30' and 19° 30' respectively, the latitude of the place, is

A. 30°

B. 35°

C. 40°

D. 45°

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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

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

According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

A. Tangents of two adjacent parts

B. Sines of two adjacent parts

C. Cosines of two adjacent parts

D. Both (a) and (b) above

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4

The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called

A. Equator

B. Celestial equator

C. Ecliptic

D. None of these

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4

The position of the sun when its north declination is maximum is known as

A. Vernal equinox

B. Autumnal equinox

C. Summer solstice

D. Winter solstice

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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

Homologous points are

A. Opposite corners of a photograph

B. Nodal points of the camera lens

C. Corresponding points on the ground and photograph

D. Plumb points of stereo pair of photographs

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4

The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

A. Altitude and azimuth system

B. Declination and hour angle system

C. Declination and right ascension system

D. Declination and altitude system

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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 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 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

Longitudes are measured from 0° to

A. 180° eastward

B. 180° westward

C. 180° east or westward

D. 360° eastward

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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

Latitude of the observer's position is equal to altitude of

A. North pole

B. Pole star

C. Celestial pole

D. All the above