In truly vertical photographs without relief angles are true at the plumb point
In tilted photographs without relief, angles are true at the iso-centre
In tilled photographs with relief, angles are true at the principal point
None of these
C. In tilled photographs with relief, angles are true at the principal point
Refraction correction is zero when the celestial body is in the zenith
Refraction correction is 33' when the celestial body is on the horizon
Refraction correction of celestial bodies depends upon their altitudes
All the above
Normal to base line
Parallel to base line
Both (a) and (b)
Neither (a) nor (b)
4.4 mm
5.5 mm
6.5 mm
7.5 mm
22° 30'
23° 27'
23° 30'
24° 0'
March 21
June 21
September 21
December 22
One minute arc of the great circle passing through two points
One minute arc of the longitude
1855.109 m
All the above
First point of Aeries
First point of Libra
Vernal Equinox
Both (b) and (d) of the above
The measured stereoscopic base of photographs is obtained by dividing the air base in metres by the mean scale of the photograph
The difference between the absolute parallax of two points depends upon the difference in their elevations
The line joining the principal point of a photograph and the transferred principal point of the adjoining photograph, is called stereoscopic base
All the above
Two angle equations and two side equations
One angle equation and three side equations
Three angle equations and one side equation
None of these
Mean sun
True sun
Vernal equinox
All the above
Isocenter
Principal point
Perspective centre
Plumb line
52 m
62 m
72 m
82 m
Once
Twice
Thrice
Four times
1/3
1/2
3/4
5/4
Base line of the left photograph of stereo pair
Base line of the right photograph of stereo pair
Sum of the base lines of stereo pair
Mean of the base lines of the stereo pair
Isocenter
Plumb point
Principal point
None of these
East of observer
West of observer
North of observer
South of observer
Equator
Horizon
Pole
None of these
58 mm
60 mm
62 mm
64 mm
0.1 mm
0.5 mm
1.00 mm
1.1 mm
When the star momentarily moves vertically
When the angle at the star of the spherical triangle is 90°
When the star's declination is greater than the observer's latitude
All the above
At culmination
At elongation
Neither at culmination nor at elongation
Either at culmination or at elongation
Eastward
Westward
Northward
Southward
10°
20°
30°
40°
By subtracting their longitudes if places are in the same hemisphere
By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
All the above
80°
70°
60°
40°
1000 km
800 km
600 km
500 km
πR²E/90°
πR²E/180°
πR²E/270°
πR²E/360°
Ground elevation
Flying height
Length of air base
All the above
Swing
Tilt
Tip
None of these