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Current Affairs January 2024

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4

The angular distance of a heavenly body from the equator, measured along its meridian, is called

A. Declination

B. Altitude

C. Zenith distance

D. Co-latitude

Correct Answer :

A. Declination


Related Questions

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4

The scale of a tilted photograph of focal length f, taken from an altitude H, along the plate parallel through plumb point, is

A. f/H sec θ

B. f sec θ/H

C. f/H

D. f/H cos ½θ

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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

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 sidereal day is the time interval between two successive upper transits of

A. Mean sun

B. First point of Aries

C. First point of Libra

D. The polar star

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4

International Date Line is located along

A. Standard meridian

B. Greenwich meridian

C. Equator

D. 180° longitude

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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

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

Pick up the correct statement from the following:

A. The vertical plane containing the zenith, the station of observation and the celestial pole is the observer's meridian plane

B. The angle between the direction of star in vertical plane and the direction of the star in horizontal plane is called the altitude of the star

C. The complement of the altitude of star is called the zenith distance of the star

D. All the above

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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

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4

The altitude of a circumpolar star is maximum when it is

A. At east elongation

B. At upper culmination

C. At west elongation

D. At lower culmination

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4

Pick up the correct statement from the following:

A. The plane passing through the perspective centre of a stereo pair and a ground point, is known as basal plane

B. Each pair of image points on stereo pair have their own basal plane

C. Relative orientation means reconstructing the basal plane

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

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 difference in longitude of two places expressed in time is equal to the difference in their

A. Sidereal time

B. Apparent solar time

C. Mean solar time

D. All the above

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4

On vertical photographs, height displacement is

A. Positive for points above datum

B. Negative for points below datum

C. Zero for points vertically below the air station

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

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

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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

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

Longitude of a place is the angular distance between the meridian of the place and

A. The standard meridian

B. The international date line

C. That of Greenwich

D. Both (a) and (c) of above

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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°

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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

Latitude of a place is the angular distance from

A. Greenwich to the place

B. Equator to the poles

C. Equator to the nearer pole

D. None of these

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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

In a tropical year, the numbers of sidereal days are

A. One less than mean solar days

B. One more than mean solar days

C. Equal to mean solar days

D. None of these

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4

The Polaris describes a small circle round the pole whose radius is approximately

A.

B.

C.

D.

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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

Systematic errors

A. Always follow some definite mathematical law

B. Can be removed by applying corrections to the observed values

C. Are also known as cumulative errors

D. All the above

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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

When a star is between the pole and the horizon, the relationship between latitude (λ), zenith distance (z) and declination δ, is

A. θ = z + δ

B. θ = δ - z

C. θ = 180° - (z + δ)

D. θ = (z + δ) - 180°