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Current Affairs January 2024

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4

Triangulation surveys are carried out for providing

A. Planimetric control

B. Height control

C. Both planimetric and height control

D. None of these

Correct Answer :

C. Both planimetric and height control


Related Questions

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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

Pick up the incorrect statement from the following. In a spherical triangle

A. Every angle is less than two right angles

B. Sum of the three angles is equal to two right angles

C. Sum of the three angles less than six right angles and greater than two right angles

D. Sum of any two sides is greater than the third

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4

A star may culminate at zenith if its declination is

A. Greater than the longitude of the place

B. Less than the latitude of the place

C. Equal to the latitude of the place

D. None of these

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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

At upper culmination, the pole star moves

A. Eastward

B. Westward

C. Northward

D. Southward

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4

The great circle whose plane is perpendicular to the axis of rotation of the earth, is called

A. Equator

B. Terrestrial equator

C. 0° latitude

D. All the above

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4

The Polaris remains below horizon at

A. 10° N

B. 50° N Latitude

C. Equator

D. 5° S latitude

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4

Pick up the correct statement from the following:

A. Centre of the celestial sphere is taken as the position of the observer

B. Centre of the celestial sphere is taken as the centre of the earth

C. Stars move and maintain their relative positions

D. All the above

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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

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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

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

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

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

A plate parallel is the line on the plane of the negative

A. Parallel to the principal line

B. Perpendicular to the principal line

C. Along the bisector of the angle between the principal line and a perpendicular line through principal plane

D. None of these

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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 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 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

The average eye base is assumed as

A. 58 mm

B. 60 mm

C. 62 mm

D. 64 mm

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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

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

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

The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by

A. sin λ

B. cos λ

C. tan λ

D. cot λ

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4

The First Point of Aeries

A. Is the point in the celestial sphere where zero meridian crosses the celestial equator

B. Is usually denoted by the Greek letter γ

C. Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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

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 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 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

For any star to be a circumpolar star, its

A. Declination must be 0°

B. Declination must be 90°

C. Distance from the pole must be less than the latitude of the observer

D. Hour angle must be 180°

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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 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