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From the principal point the horizon point lies on the principal line at a distance of
f cos θ.
f sin θ
f tan θ
f cot θ
The parallax equation is applicable to entire overlap of the photographs only if parallax is measured
Both (a) and (b)
normal to base line
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
where w is the weight of tape/m
Reduction to mean sea level =
All the above.
Rotation of the camera at exposure about its vertical axis, is known as
tilt
None of these.
Swing
tip
Places having same latitude
are equidistant from the nearer pole
All the above.
are equidistant from the equator
lie on the parallel of the latitude
are equidistant from both the poles
Triangulation surveys are carried out for locating
engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
control points for surveys of large areas
All the above.
control points for photogrammetric surveys
Systematic errors
can be removed by applying corrections to the observed values
either make the result too great or too small
All the above.
are also known as cumulative errors
always follow some definite mathematical law
The value of geo-centric parallax to be added to the observed altitude of sun is
9" cos α
9" sin α
9" cot α.
9" tan α
If a star whose declination is 60° N culminates at zenith, its altitude at the lower culmination, is
40°
60°.
20°
30°
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
7 h 30 m
9 h 00 m.
8 h 00 m
8 h 30 m
7 h 00 m
A star may culminate at zenith if its declination is
equal to the latitude of the place
None of these.
less than the latitude of the place
greater than the longitude of the place
The angular distance of a heavenly body from the equator, measured along its meridian, is called
altitude
co-latitude.
zenith distance
declination
While making astronomical observations, the observer is mainly concerned with
the direction of the vertical, the axis of rotation of the instrument
the direction of the star from the instrument
All the above.
the direction of the poles of the celestial sphere
Longitude of a place is the angular distance between the meridian of the place and
the standard meridian
that of Greenwich
both (a) and (c) of above.
the International Date line
Pick up the incorrect statement from thefollowing.
The angular distance of hevenly bodies on observer's meridian measured from the pole, is
co-latitude
co-altitude
co-declination
polar distance
None of these.
The moon rotates round the earth once in every
29 days
30 days.
29.53 days
29.35 days
In triangulation surveys
All the above.
sides are not measured excepting the base line
the area is divided into triangular figures
angular measurements are only resorted to
control stations are located from which detailed surveys are carried out
To have greatest coverage of the area, the type of photography used, is
low oblique
None of these.
high oblique
vertical
The station which is selected close to the main triangulation station, to avoid intervening obstruction, is not known as
eccentric station
pivot station.
false station
satellite station
If the equatorial distance between two meridians is 100 km, their distance at 60° latitude will be
400 km.
500 km
600 km
1000 km
800 km
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