51. In field astronomy, the quantities observed are entirely
52. The net ground area of a vertical photograph 20 cm × 20 cm on scale 1 : 10,000 having overlaps 60% and 30%, is
53. Spring tides are caused when
54. Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year
55. The time interval between successive transits of the moon, is
56. If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
57. A star in northern sphere is said to transit
58. Normal tension is that pull which
59. After fixing the plane table to the tripod, the main operations which are needed at each plane table station are
(i) Levelling
(ii) Orientation
(iii) Centering
The correct sequence of these operations is
(i) Levelling
(ii) Orientation
(iii) Centering
The correct sequence of these operations is
60. For accurate work, the steel band should always be used in preference to chain because the steel band
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