Home
Current Affairs January 2024

What is the correct answer?

4

For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through

A. Isocenter

B. Plumb point

C. Principal point

D. None of these

Correct Answer :

A. Isocenter


Related Questions

What is the correct answer?

4

Pick up the correct statement from the following:

A. Aerial photographs may be either vertical or oblique

B. Vertical photographs are taken with the axis of camera pointing vertically downward

C. Vertical photographs are used for most accurate maps

D. All the above

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.

What is the correct answer?

4

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

A. 1600

B. 1615

C. 1630

D. 1650

What is the correct answer?

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

What is the correct answer?

4

If the altitudes of a star at its upper and lower transits are 60° 30' and 19° 30' respectively, the latitude of the place, is

A. 30°

B. 35°

C. 40°

D. 45°

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

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

A.

B.

C.

D.

What is the correct answer?

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

What is the correct answer?

4

The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

A. 4.4 mm

B. 5.5 mm

C. 6.5 mm

D. 7.5 mm

What is the correct answer?

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°

What is the correct answer?

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

What is the correct answer?

4

The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

A. Principal point

B. Isocenter

C. Plumb point

D. Perspective centre

What is the correct answer?

4

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

What is the correct answer?

4

The position of a heavenly body on the celestial sphere can be completely specified by

A. Its altitude and azimuth

B. Its declination and hour angle

C. Its declination and right ascension

D. All the above

What is the correct answer?

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

What is the correct answer?

4

The orthogonal projection of the perspective centre on a tilted photograph, is called

A. Nadir

B. Isocenter

C. Principal point

D. Plumb point

What is the correct answer?

4

With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

A. 7 h 00 m

B. 7 h 30 m

C. 8 h 00 m

D. 9 h 00 m

What is the correct answer?

4

The elevation of the star at elongation is obtained by

A. sin α = sin φ cosec δ

B. sin α = sin φ sec δ

C. sin α = cos φ sec δ

D. sin α = cos φ cosec δ

What is the correct answer?

4

In a spherical triangle ABC right angled at C, sin b equals to

A. sin c sin B

B. cos c cos B

C. tan c tan B

D. sin c cos B

What is the correct answer?

4

The point at which sun's declination changes from north to south, is known as

A. First point of Aeries

B. First point of Libra

C. Vernal Equinox

D. Both (b) and (d) of the above

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

Triangulation surveys are carried out for providing

A. Planimetric control

B. Height control

C. Both planimetric and height control

D. None of these

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

The angle between the axis of earth and the vertical at the station of observation is called

A. Astronomical latitude

B. Astronomical co-latitude

C. Co-declination of star

D. Declination of star

What is the correct answer?

4

The station pointer is generally used in

A. Triangulation surveying

B. Astronomical surveying

C. Hydrographical surveying

D. Photogrammetric surveying

What is the correct answer?

4

Limiting gradient for locating the base line on evenly-sloping ground, is

A. 1 in 12

B. 1 in 10

C. 1 in 8

D. 1 in 6