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

Polaris is usually observed for the determination of the latitude when it is

Pick up the correct statement from the following:

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

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

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

On vertical photographs, height displacement is

At the first point of Aeries, the sun moves

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

Pick up the in-correct statement from the following:

If θ and δ be the latitude of a place and declination of a star respectively, the upper culmination of the star will be north of zenith if its zenith distance, is

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

An aerial photograph may be assumed as

The slotted template method

The latitude of the observer’s position, is

Triangulation surveys are carried out for locating

Pick up the correct statement for horizontal photographs.

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

Pick up the correct statement from the following:

A nautical mile is

Pick up the correct statement from the following:

Pick up the correct statement from the following:

If ‘δ’ is the declination of the star and ‘ϕ’ is the latitude of the observer, then the azimuth of the star at elongation is given by

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

If ‘δ’ is the declination of the star and ‘ϕ’ is the latitude of the observer then the hour angle of the star at elongation is given by

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

The coverage is least if photography is

The latitude (ʎ) of a place and the altitude (α) of the pole are related by

The principal line is the line joining the principal point and

The parallax equation ∆p = Bm∆h/H – h is applicable to entire overlap of the photographs only if parallax is measured

If “δ’ is the declination of the Polaris and ‘ʎ’ is the latitude of the place, the azimuth of the Polaris, is

The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is

23 cm x 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents

The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

Pick up the correct statement from the following:

International Date Line is located along

Homologous points are

The point on the celestial sphere vertically below the observer’s position, is called

If a is the observed altitude, the refraction correction in seconds, is

Polaris is usually observed for the determination of the azimuth when it is

The station pointer is generally used in

While making astronomical observations, the observer is mainly concerned with

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

The correction applied to the measured base of length is

Pick up the in-correct statement from the following:

Pick up the correct statement from the following:

Pick up the correct statement from the following:

The following points form a pair of homologous points:

Pick up the correct statement from the following:

Pick up the incorrect statement from the following:

Pick up the correct statement from the following:

The main object of the astronomer to obtain

Pick up the correct statement from the following:

Pick up the correct statement from the following:

The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between

The stereo plotting instruments are generally manufactured on the principle of

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

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

The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

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

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

The circle in which a plane tangent to the earth’s surface at the point of observation, intersects the celestial sphere, is called

The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called

The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as

In triangulation surveys

The First Point of Aeries

The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is

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

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

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

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

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

The altitude of a circumpolar star is maximum when it is

If v, t and f/H are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement

The negative sign is assigned to

The height displacement on a vertical photograph

The distance between the minor control point and the principal point should be equal to

The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

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

Latitude of a place is the angular distance from

The want of correspondence in stereo-photographs

The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:

The nautical mile is the length of

The necessary geometrical condition for triangulation adjustment is:

The great circle which passes through the zenith, nadir and the poles, is known as

The point where vertical line passing through the perspective centre intersects the plane of the photograph, is known as

Stellar astronomy deals with

The point where a vertical line through the optical centre of the camera lens intersects the ground, is known as

The altitude of a heavenly body is its angular distance, measured on the vertical circle passing through the body, above

A star may culminate at zenith if its declination is

H’ is the flying height above mean ground level and ‘f is the principal distance of a vertical photograph. The mean scale of the photographs is

If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be

Latitude of the observer’s position is equal to altitude of

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

The meridian of a place is

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

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

Pick up the correct statement from the following:

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

In field astronomy, the quantities observed are entirely

Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

For mapping any country

Pick up the incorrect statement from the following. The angular distance of heavenly bodies on observer’s meridian measured from the pole, is

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

The sun’s declination remains north between

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

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

The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is

Rotation of the camera at exposure about horizontal axis normal to the line of flight, is known as

Pick up the correct statement from the following:

In observations of equal precision, the most probable values of the observed quantities are those that render the sum of the squares of the residual errors a minimum, is the fundamental principle of

The station which is selected close to the main triangulation station, to avoid intervening obstruction, is not known as

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

The shortest distance between two places measured along the surface of the earth, is

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

Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

The prime vertical passes through

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

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

For adjusting a quadrilateral whose both the diagonals are observed, the equations of conditions involved, are

The zenith is the point on the celestial sphere

Rotation of the camera at exposure about its vertical axis, is known as

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

The position of the sun when its north declination is maximum is known as

Sidereal day

If θ and δ be the latitude of an observer and declination of a heavenly body respectively, the upper culmination of the body will be south of zenith if its zenith distance, is

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

The scale of a vertical photograph of focal length ‘f taken from height of ‘H’ metres above M.S.L., at a point of reduced level ‘h\ is

The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

Systematic errors

Pick up the correct statement from the following:

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

A star is said to elongate

The elevation of the star at elongation is obtained by

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

Circumpolar stars

Pick up the incorrect statement from the following:

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

Longitudes are measured from 0° to

At eastern elongation, the pole star moves

The distance between the projection centre and the photograph, is called

If E is the spherical excess and R the radius of the earth, the surface area of the triangle, is

Accidental errors

According to Napier’s Rules of circular parts for a right angled triangle, sine of middle part equals the product of

The correction for parallax, is

Pick up the correct statement from the following:

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

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

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

The declination and right ascension of the sun becomes 23° 27′ N and 90° respectively on

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

The solar tidal force divided by lunar tidal force is

In a tropical year, the numbers of sidereal days are

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

If α, H, A and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude ʎ, the following relation holds good

Triangulation surveys are carried out for providing

The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is

If S is the sum of three angles of a spherical triangle, the spherical excess equals

If the equatorial distance between two meridians is 100 km, their distance at 60° latitude will be

If two points differing by 1° of latitude and of the same longitude is 110 km apart on the earth, then two astronomical positions on the moon is about

Spring tides are caused when

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

For any star to be a circumpolar star, its

At upper culmination, the pole star moves

The parallax of a point on the photograph is due to

A star in northern sphere is said to transit

Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel

The value of geo-centric parallax to be added to the observed altitude of sun is

In a tropical year, the numbers of sidereal days are

Homologous point is

Perspective centre relates to

To have greatest coverage of the area, the type of photography used, is

The moon rotates round the earth once in every

The angle between the observer’s meridian and declination circle of a heavenly body, is known as

Places having same latitude