Practice Test: Question Set - 07
1. ‘H’ is the flying height above mean ground level and ‘f’ is the principal distance of a vertical photograph. The mean scale of the photographs is
- (A) H. f
- (B) H/f
- (C) f/H
- (D) H + f
2. If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be
- (A) 2 mm
- (B) 4 mm
- (C) 6 mm
- (D) 10 mm
3. Latitude of the observer's position is equal to altitude of
- (A) North pole
- (B) Pole star
- (C) Celestial
pole
- (D) All the
above
4. The flying height of the camera is 1,000 m above mean ground level, the distance of the top of a building from a nadir point is 10 cm and the relief displacement of building is 7.2 mm. The height of the building, is
- (A) 52 m
- (B) 62 m
- (C) 72 m
- (D) 82 m
5. The meridian of a place is
- (A) A great
circle passing through the place and the poles
- (B) A great
circle whose plane is perpendicular to the axis of rotation and it also passes
through the place
- (C) A
semi-circle which passes through the place and is terminated at the poles
- (D) An
arc of the great circle which passes through the place and is perpendicular to
the equator
6. The orthogonal projection of the perspective centre on a tilted photograph, is called
- (A) Nadir
- (B) Isocenter
- (C) Principal
point
- (D) Plumb point
7. When a star is between the pole and the horizon, the relationship between latitude (λ), zenith distance (z) and declination δ, is
- (A) θ = z +
δ
- (B) θ = δ
- z
- (C) θ = 180° - (z +
δ)
- (D) θ = (z +
δ) - 180°
8. Pick up the correct statement from the following:
- (A) Refraction
correction is zero when the celestial body is in the zenith
- (B) Refraction
correction is 33' when the celestial body is on the horizon
- (C) Refraction
correction of celestial bodies depends upon their altitudes
- (D) All the
above
9. Pick up the incorrect statement from the following. In a spherical triangle
- (A) Every angle
is less than two right angles
- (B) Sum
of the three angles is equal to two right angles
- (C) Sum of the
three angles less than six right angles and greater than two right angles
- (D) Sum of any
two sides is greater than the third
10. In field astronomy, the quantities observed are entirely
- (A) Lengths
- (B) Angles
- (C) Heights
- (D) All of these
11. Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year
- (A) Once
- (B) Twice
- (C) Thrice
- (D) Four
times
12. For mapping any country
- (A) Geodetic
triangulation of greatest possible sides and accuracy is carried out
- (B) Primary
triangles are broken down into secondary triangles of somewhat lesser accuracy
- (C) Secondary
triangles are further broken into third and fourth order triangles, the points
of which are used for detail surveys
- (D) All
the above
13. Pick up the incorrect statement from the following. The angular distance of heavenly bodies on observer's meridian measured from the pole, is
- (A) Co-declination
- (B) Co-altitude
- (C) Co-latitude
- (D) Polar
distance
14. Longitude of a place is the angular distance between the meridian of the place and
- (A) The standard
meridian
- (B) The
International Date Line
- (C) That
of Greenwich
- (D) Both (a) and
(c) of above
15. The sun's declination remains north between
- (A) March 21 to
June 21
- (B) June 21 to
September 21
- (C) September 21
to December 21
- (D) Both (a) and
(b) of above
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