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Current Affairs January 2024

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4

Circumpolar stars

A. Rotate round the North Pole

B. Rotate round the celestial pole

C. Remain always above the horizon

D. Are seldom seen near the pole star

Correct Answer :

C. Remain always above the horizon


Related Questions

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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

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

If δ is the declination of the Polaris and λ is the latitude of the place, the azimuth of the Polaris, is

A. cos δ/cos λ

B. cos (90° - δ)/cos (90° - λ)

C. sin (90° - δ)/sin (90° - λ)

D. tan (90° + δ)/tan (90° + λ)

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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 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:

A. Latitudes north of the equator are taken as positive

B. Latitudes south of the equator are taken as negative

C. Longitudes east of Greenwich are taken as negative

D. Longitudes west of Greenwich are taken as positive

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4

If v, t and f/H are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement

A. i = v. t. H/f

B. i = v. f/t. H

C. i = v. t. (f/H)

D. i = t. H/v. f

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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

At eastern elongation, the pole star moves

A. Eastward

B. Westward

C. Northward

D. Southward

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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

Places having same latitude

A. Lie on the parallel of the latitude

B. Are equidistant from the nearer pole

C. Are equidistant from both the poles

D. All the above

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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

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

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

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

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

To obtain photographs of an area of 1000 m average elevation, on scale 1 : 30, 000, with a camera of 30 cm focal length, the flying height is

A. 4000 m

B. 5000 m

C. 6000 m

D. 7000 m

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4

Pick up the correct statement from the following:

A. North end of the polar axis is known as North Pole

B. South end of the polar axis is known as South Pole

C. Point where polar axis when produced northward intersects the celestial sphere, is known as north celestial pole

D. All the above

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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

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 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

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

If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be

A. 2 mm

B. 4 mm

C. 6 mm

D. 10 mm

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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

Pick up the correct statement from the following:

A. One degree of longitude has greatest value at the equator

B. One degree of longitude has greatest value at the poles

C. One degree of longitude has the same value everywhere

D. One degree of latitude decreases from the equator to the poles

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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

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4

The prime vertical passes through

A. The east point of the horizon

B. The west point of the horizon

C. The zenith point of the observer

D. All the above

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4

The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is

A. 1 : 10,000

B. 1 : 15,000

C. 1 : 20,000

D. 1 : 30,000

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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 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