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From the principal point the horizon point lies on the principal line at a distance of
f cot θ
f tan θ
f sin θ
f cos θ.
The parallax equation is applicable to entire overlap of the photographs only if parallax is measured
normal to base line
Both (a) and (b)
parallel to base line
neither (a) nor (b).
The correction applied to the measured base of length L is
where h is height difference of end supports
Reduction to mean sea level =
All the above.
where w is the weight of tape/m
Rotation of the camera at exposure about its vertical axis, is known as
Swing
tilt
None of these.
tip
Places having same latitude
lie on the parallel of the latitude
are equidistant from the equator
are equidistant from the nearer pole
All the above.
are equidistant from both the poles
Triangulation surveys are carried out for locating
All the above.
control points for photogrammetric surveys
control points for surveys of large areas
engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
Systematic errors
either make the result too great or too small
always follow some definite mathematical law
All the above.
are also known as cumulative errors
can be removed by applying corrections to the observed values
The value of geo-centric parallax to be added to the observed altitude of sun is
9" cot α.
9" tan α
9" cos α
9" sin α
If a star whose declination is 60° N culminates at zenith, its altitude at the lower culmination, is
30°
40°
20°
60°.
10°
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
9 h 00 m.
7 h 30 m
8 h 30 m
7 h 00 m
8 h 00 m
A star may culminate at zenith if its declination is
equal to the latitude of the place
greater than the longitude of the place
less than the latitude of the place
None of these.
The angular distance of a heavenly body from the equator, measured along its meridian, is called
declination
co-latitude.
altitude
zenith distance
While making astronomical observations, the observer is mainly concerned with
the direction of the poles of the celestial sphere
All the above.
the direction of the star from the instrument
the direction of the vertical, the axis of rotation of the instrument
Longitude of a place is the angular distance between the meridian of the place and
both (a) and (c) of above.
the International Date line
that of Greenwich
the standard meridian
Pick up the incorrect statement from thefollowing.
The angular distance of hevenly bodies on observer's meridian measured from the pole, is
co-declination
co-altitude
polar distance
co-latitude
None of these.
The moon rotates round the earth once in every
30 days.
29 days
29.53 days
29.35 days
In triangulation surveys
control stations are located from which detailed surveys are carried out
angular measurements are only resorted to
All the above.
sides are not measured excepting the base line
the area is divided into triangular figures
To have greatest coverage of the area, the type of photography used, is
high oblique
low oblique
vertical
None of these.
The station which is selected close to the main triangulation station, to avoid intervening obstruction, is not known as
false station
satellite station
pivot station.
eccentric station
If the equatorial distance between two meridians is 100 km, their distance at 60° latitude will be
400 km.
800 km
1000 km
600 km
500 km
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