Practice Test: Question Set - 03
1. If ‘δ’ is the declination of the Polaris and ‘λ’ is the latitude of the place, the azimuth of the Polaris, is
- (A) cos δ/cos λ
- (B) cos (90° - δ)/cos (90° - λ)
- (C) sin (90° - δ)/sin (90° - λ)
- (D) tan (90° + δ)/tan (90° + λ)
2. The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is
- (A) 500 m
- (B) 1000 m
- (C) 1500 m
- (D) 2000 m
3. 23 cm × 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
- (A) 1 m
- (B) 2 m
- (C) 4 m
- (D) 8 m
4. The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is
- (A) Altitude and azimuth system
- (B) Declination and hour angle system
- (C) Declination and right ascension system
- (D) Declination and altitude system
5. Pick up the correct statement from the following:
- (A) The star's movement is apparent due to the actual steady rotation of the earth about its axis
- (B) The stars move round in circular concentrated parts
- (C) The centre of the circular paths of stars is the celestial pole
- (D) All the above
6. International Date Line is located along
- (A) Standard meridian
- (B) Greenwich meridian
- (C) Equator
- (D) 180° longitude
7. Homologous points are
- (A) Opposite corners of a photograph
- (B) Nodal points of the camera lens
- (C) Corresponding points on the ground and photograph
- (D) Plumb points of stereo pair of photographs
8. The point on the celestial sphere vertically below the observer's position, is called
- (A) Zenith
- (B) Celestial point
- (C) Nadir
- (D) Pole
9. If α is the observed altitude, the refraction correction in seconds, is
- (A) 58" cot α
- (B) 58" tan α
- (C) 58 sin α
- (D) 58 cos α
10. Polaris is usually observed for the determination of the azimuth when it is
- (A) At culmination
- (B) At elongation
- (C) Neither at culmination nor at elongation
- (D) Either at culmination or at elongation
11. The station pointer is generally used in
- (A) Triangulation surveying
- (B) Astronomical surveying
- (C) Hydrographical surveying
- (D) Photogrammetric surveying
12. While making astronomical observations, the observer is mainly concerned with
- (A) The direction of the vertical, the axis of rotation of the instrument
- (B) The direction of the poles of the celestial sphere
- (C) The direction of the star from the instrument
- (D) All the above
13. Right ascension of a heavenly body is its equatorial angular distance measured
- (A) Westward from the first point of Libra
- (B) Eastward from the first point of Aeries
- (C) Westward from the first point of Aeries
- (D) Eastward from the first point of Libra
14. The correction applied to the measured base of length ‘L’ is
- (A) Tension = (P - Ps)L/AE
- (B) Sag = L3w²/24P² where w is the weight of tape/m
- (C) Slope = (h²/2L) + (h4/8L3) where h is height difference of end supports
- (D) All the above
15. Pick up the in-correct statement from the following:
- (A) Apparent solar time is measured from the lower transit of the true sun
- (B) Mean solar time is measured from the lower transit of the mean sun
- (C) Sidereal time is measured from the lower transit of the first point of Aries
- (D) Sidereal time is measured from the upper transit of the first point of Aries