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Current Affairs January 2024

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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

Correct Answer :

C. By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres


Related Questions

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The true and mean suns occupy the same meridian at the same time on

A. April 15

B. June 14

C. September 1

D. All the above

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The maximum error in radial line assumption, is

A. h/H f tan θ

B. h/H f² tan θ

C. h/H f² sin θ

D. h/H f cos θ

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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 negative sign is assigned to

A. Reduction to mean sea level

B. Correction for horizontal alignment

C. Correction for slope

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 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

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

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

Pick up the incorrect statement from the following. High oblique photographs

A. May have tilt up to 30°

B. May include the image of the horizon

C. May not include the image of the horizon

D. None of these

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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

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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Accidental errors

A. Do not follow any definite mathematical law

B. Cannot be removed by applying corrections to the observed values

C. Are generally small

D. All the above

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4

Pick up the correct statement from the following:

A. If the applied tension to the tape is more than the standard, the tension correction is positive

B. If the applied tension to the tape is less than the standard, the tension correction is negative

C. If the temperature during measurement is greater than the standard temperature, the temperature correction is positive

D. All the above

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4

The angle between the direction of star and the direction of earth's axis of rotation is called

A. Co-declination

B. Co-latitude

C. Declination

D. Latitude

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G.M.T. corresponding to given mean time, equals

A. L.M.T. - East longitude in time

B. L.M.T. + East longitude in time

C. L.M.T. - West longitude in time

D. None of these

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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

From the principal point the horizon point lies on the principal line at a distance of

A. f tan θ

B. f sin θ

C. f cot θ

D. f cos θ

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4

The equation which is obtained by multiplying each equation by the coefficient of its un-knowns and by adding the equations thus formed, is known as

A. Observation equation

B. Conditional equation

C. Normal equation

D. None of these

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4

A star in northern sphere is said to transit

A. When its altitude is maximum

B. When its azimuth is 180°

C. When it is in south

D. All the above

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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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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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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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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

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 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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While making astronomical observations, the observer is mainly concerned with

A. The direction of the vertical, the axis of rotation of the instrument

B. The direction of the poles of the celestial sphere

C. The direction of the star from the instrument

D. All the above

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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

The average eye base is assumed as

A. 58 mm

B. 60 mm

C. 62 mm

D. 64 mm

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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

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Right ascension of a heavenly body is its equatorial angular distance measured

A. Westward from the first point of Libra

B. Eastward from the first point of Aeries

C. Westward from the first point of Aeries

D. Eastward from the first point of Libra