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Current Affairs January 2024

What is the correct answer?

4

If the general ground level of any area is 10% of the flying height, the principal points may be used as the centres of radial directions for small scale mapping even in tilted photograph up to

A.

B.

C.

D.

Correct Answer :

C. 3°


Related Questions

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4

The method of surveying by triangulation was first introduced by the Dutchman Snell in

A. 1600

B. 1615

C. 1630

D. 1650

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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

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

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

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

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

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 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

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

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

Spring tides are caused when

A. Sun and moon are in line with earth

B. Solar tidal force acts opposite to lunar tidal force

C. Solar tidal force and lunar tidal force both coincide

D. None of these

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4

The station where observations are not made, but the angles at the station are used in triangulation series, is known as

A. Satellite station

B. Subsidiary station

C. Pivot station

D. Main station

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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

The normal longitudinal overlap is generally kept

A. 50 %

B. 60 %

C. 70 %

D. 75 %

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4

The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The declination of the star, is

A. 80°

B. 70°

C. 60°

D. 50°

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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

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

Assuming human normal vision distance 25 cm, smallest measurable angle 20, and intraocular distance 6.5 cm, the smallest depth to be discerned is

A. 0.1 mm

B. 0.5 mm

C. 1.00 mm

D. 1.1 mm

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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

If the distance between the projectors is altered by a movement along X-axis of one projector,

A. The length of the air base is increased

B. The scale of the model is altered

C. y-parallax is not affected

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

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

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

An aerial photograph may be assumed as

A. Parallel projection

B. Orthogonal projection

C. Central projection

D. None of these

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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

Pick up the correct statement from the following:

A. The star's movement is apparent due to the actual steady rotation of the earth about its axis

B. The stars move round in circular concentrated parts

C. The centre of the circular paths of stars is the celestial pole

D. All the above

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4

A star is said to elongate

A. When the star momentarily moves vertically

B. When the angle at the star of the spherical triangle is 90°

C. When the star's declination is greater than the observer's latitude

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

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 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