Practice Test: Question Set - 11
1. To obtain photographs of an area of 1000 m average elevation, on scale 1 : 30,000, with a camera of 30 cm focal length, the flying height is
- (A) 4000 m
- (B) 5000 m
- (C) 6000 m
- (D) 7000 m
2. The solar tidal force divided by lunar tidal force is
- (A) 1/3
- (B) 1/2
- (C) 3/4
- (D) 5/4
3. In a tropical year, the numbers of sidereal days are
- (A) One less than mean solar days
- (B) One more than mean solar days
- (C) Equal to mean solar days
- (D) None of these
4. The point at which sun's declination changes from north to south, is known as
- (A) First point of Aeries
- (B) First point of Libra
- (C) Vernal Equinox
- (D) Both (b) and (d) of the above
5. If α, H, A and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude λ, the following relation holds good
- (A) cos H = tan λ/tan δ
- (B) sin α = sin λ/sin δ
- (C) sin A = cos δ/cos λ
- (D) All the above
6. Triangulation surveys are carried out for providing
- (A) Planimetric control
- (B) Height control
- (C) Both planimetric and height control
- (D) None of these
7. The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is
- (A) 22° 30'
- (B) 23° 27'
- (C) 23° 30'
- (D) 24° 0'
8. If S is the sum of three angles of a spherical triangle, the spherical excess equals
- (A) S - 90°
- (B) S - 180°
- (C) S - 270°
- (D) S - 360°
9. If the equatorial distance between two meridians is 100 km, their distance at 60° latitude will be
- (A) 1000 km
- (B) 800 km
- (C) 600 km
- (D) 500 km
10. If two points differing by 1° of latitude and of the same longitude is 110 km apart on the earth, then two astronomical positions on the moon is about
- (A) 10 km
- (B) 25 km
- (C) 30 km
- (D) 50 km
11. Spring tides are caused when
- (A) Sun and moon are in line with earth
- (B) Solar tidal force acts opposite to lunar tidal force
- (C) Solar tidal force and lunar tidal force both coincide
- (D) None of these
12. The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The declination of the star, is
- (A) 80°
- (B) 70°
- (C) 60°
- (D) 50°
13. For any star to be a circumpolar star, its
- (A) Declination must be 0°
- (B) Declination must be 90°
- (C) Distance from the pole must be less than the latitude of the observer
- (D) Hour angle must be 180°
14. At upper culmination, the pole star moves
- (A) Eastward
- (B) Westward
- (C) Northward
- (D) Southward
15. The parallax of a point on the photograph is due to
- (A) Ground elevation
- (B) Flying height
- (C) Length of air base
- (D) All the above