# 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 vt and f/H are 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

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