০০। 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
ক) 1 m
খ) 2 m
গ) 3 m
ঘ) 4 m
ঙ) 5 m.
০১। A nautical mile is
ক) one minute arc of the great circle passing through two points
খ) one minute arc of the longitude
গ) 6080 ft
ঘ) 1855.109 m
ঙ) all the above.
০২। A plate parallel is the line on the plane of the negative
ক) parallel to the principal line
খ) perpendicular to the principal line
গ) along the bisector of the angle between the principal line and a perpendicular line through principal plane
ঘ) none of these.
০৩। A star in northern sphere is said to transit
ক) when its altitude is maximum
খ) when its azimuth is 180°
গ) when it is in south
ঘ) all the above.
০৪। A star is said to elongate
ক) when the star momentarily moves vertically
খ) when the angle at the star of the spherical triangle is 90°
গ) when the star‘s declination is greater than the observer‘s latitude
ঘ) all the above.
০৫। A star may culminate at zenith if its declination is
ক) greater than the longitude of the place
খ) less than the latitude of the place
গ) equal to the latitude of the place
ঘ) none of these.
০৬। Accidental errors
ক) do not follow any definite mathematical law
খ) cannot be removed by applying corrections to the observed values
গ) are generally small
ঘ) are also known as compensating errors
ঙ) all the above.
০৭। According to Napier‘s Rules of circular parts for a right angled triangle, sine of middle part equals the product of
ক) tangents of two adjacent parts
খ) sines of two adjacent parts
গ) cosines of two adjacent parts
ঘ) cosines of two opposite parts
ঙ) both (a) and (b) above.
০৮। An aerial photograph may be assumed as
ক) parallel projection
খ) orthogonal projection
গ) central projection
ঘ) none of these.
০৯। Assuming human normal vision distance 25 cm, smallest measurable angle 20", and introcular distance 6.5 cm, the smallest depth to be discerned is
ক) 0.1 mm
খ) 0.5 mm
গ) 1.00 mm
ঘ) 1.1 mm.
১০। At eastern elongation, the pole star moves
ক) eastward
খ) westward
গ) northward
ঘ) southward.
১১। At lower culmination, the pole star moves
ক) eastward
খ) westward
গ) northward
ঘ) southward.
১২। At the first point of Aeries, the sun moves
ক) northward
খ) southward
গ) from south to north of the equator
ঘ) from north to south of the equator.
১৩। At upper culmination, the pole star moves
ক) eastward
খ) westward
গ) northward
ঘ) southward.
১৪। At western elongation, the pole star moves
ক) eastward
খ) westward
গ) northward
ঘ) southward.
১৫। By applying clockwise swing to right projector, maximum y-parallax is introduced in the model at
ক) position 1
খ) position 2
গ) position 4
ঘ) position 6.
১৬। By raising the z-column of right projector, maximum y-parallax is introduced in the model at
ক) position 1
খ) position 2
গ) position 4
ঘ) position 6
ঙ) position 4 and 6.
১৭। Circumpolar stars
ক) rotate round the north pole
খ) rotate round the celestial pole
গ) remain always above the horizon
ঘ) are seldom seen near the pole star
ঙ) none of these.
১৮। Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year
ক) once
খ) twice
গ) thrice
ঘ) four times
ঙ) five times.
১৯। For a spherical triangle ABC, pick up incorrect statement