Practice Test: Question Set - 05
1. Limiting gradient for locating the base line on evenly-sloping ground, is
- (A) 1 in 12
- (B) 1 in 10
- (C) 1 in 8
- (D) 1 in 6
2. The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called
- (A) Visible horizon
- (B) Sensible horizon
- (C) Celestial horizon
- (D) True horizon
3. The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called
- (A) Equator
- (B) Celestial equator
- (C) Ecliptic
- (D) None of these
4. The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as
- (A) Isocenter
- (B) Principal point
- (C) Perspective centre
- (D) Plumb line
5. In triangulation surveys
- (A) The area is divided into triangular figures
- (B) Control stations are located from which detailed surveys are carried out
- (C) Sides are not measured excepting the base line
- (D) All the above
6. The First Point of Aeries
- (A) Is the point in the celestial sphere where zero meridian crosses the celestial equator
- (B) Is usually denoted by the Greek letter γ
- (C) Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
- (D) All the above
7. The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is
- (A) 5100 nautical miles
- (B) 5700 nautical miles
- (C) 120 nautical miles
- (D) 500 nautical miles
8. α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is
- (A) h tan α/S
- (B) h tan β/S
- (C) h (tan α + tan β)/S
- (D) h (tan α - tan β)/S
9. In a spherical triangle ABC right angled at C, sin b equals to
- (A) sin c sin B
- (B) cos c cos B
- (C) tan c tan B
- (D) sin c cos B
10. The difference of height of two points whose parallax difference is 0.8 mm on a pair of stereo pair taken from a height ‘H’ is 100 m. If mean photo base is 95.2 mm, the flying height is
- (A) 8,000 m
- (B) 10,000 m
- (C) 12,000 m
- (D) 14,000 m
11. For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through
- (A) Isocenter
- (B) Plumb point
- (C) Principal point
- (D) None of these
12. Assuming human normal vision distance 25 cm, smallest measurable angle 20", and intraocular distance 6.5 cm, the smallest depth to be discerned is
- (A) 0.1 mm
- (B) 0.5 mm
- (C) 1.00 mm
- (D) 1.1 mm
13. The altitude of a circumpolar star is maximum when it is
- (A) At east elongation
- (B) At upper culmination
- (C) At west elongation
- (D) At lower culmination
14. If v, t and f/Hare the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement
- (A) i = v. t. H/f
- (B) i = v. f/t. H
- (C) i = v. t. (f/H)
- (D) i = t. H/v. f
15. The negative sign is assigned to
- (A) Reduction to mean sea level
- (B) Correction for horizontal alignment
- (C) Correction for slope
- (D) All the above