# 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 Î±,**

*H*,*A*and Î´ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude Î», the following relation holds good- (A)

*cos H*=

*tan Î»*/

*tan Î´*

- (B)

*sin Î±*=

*sin Î»*/

*sin*

*Î´*

- (C)

*sin A*=

*cos*

*Î´*/cos Î»

- (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

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