Practice Test: Question Set - 10
1. Circumpolar stars
- (A) Rotate round the North Pole
- (B) Rotate round the celestial pole
- (C) Remain always above the horizon
- (D) Are seldom seen near the pole star
2. Pick up the incorrect statement from the following:
- (A) In truly vertical photographs without relief angles are true at the plumb point
- (B) In tilted photographs without relief, angles are true at the iso-centre
- (C) In tilled photographs with relief, angles are true at the principal point
- (D) None of these
3. The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than
- (A) 0.01 second
- (B) 0.001 second
- (C) 0.0001 second
- (D) None of these
4. Longitudes are measured from 0° to
- (A) 180° eastward
- (B) 180° westward
- (C) 180° east or westward
- (D) 360° eastward
5. At eastern elongation, the pole star moves
- (A) Eastward
- (B) Westward
- (C) Northward
- (D) Southward
6. The distance between the projection centre and the photograph, is called
- (A) Principal distance
- (B) Principal line
- (C) Isocentric distance
- (D) Focal length
7. If E is the spherical excess and R the radius of the earth, the surface area of the triangle, is
- (A) πR²E/90°
- (B) πR²E/180°
- (C) πR²E/270°
- (D) πR²E/360°
8. Accidental errors
- (A) Do not follow any definite mathematical law
- (B) Cannot be removed by applying corrections to the observed values
- (C) Are generally small
- (D) All the above
9. According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of
- (A) Tangents of two adjacent parts
- (B) Sines of two adjacent parts
- (C) Cosines of two adjacent parts
- (D) Both (a) and (b) above
10. The correction for parallax, is
- (A) - 8".8 cos α
- (B) + .8" sin α
- (C) + 8".8 cos α
- (D) - 8".8 cos α
11. Pick up the correct statement from the following:
- (A) North end of the polar axis is known as North Pole
- (B) South end of the polar axis is known as South Pole
- (C) Point where polar axis when produced northward intersects the celestial sphere, is known as north celestial pole
- (D) All the above
12. The angle between the axis of earth and the vertical at the station of observation is called
- (A) Astronomical latitude
- (B) Astronomical co-latitude
- (C) Co-declination of star
- (D) Declination of star
13. The method of surveying by triangulation was first introduced by the Dutchman Snell in
- (A) 1600
- (B) 1615
- (C) 1630
- (D) 1650
14. The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is
- (A) f/Hsec θ
- (B) f sec θ/H
- (C) f/H
- (D) f/H cos ½θ
15. The declination and right ascension of the sun becomes 23° 27' N and 90° respectively on
- (A) March 21
- (B) June 21
- (C) September 21
- (D) December 22