# Practice Test: Question Set - 03

**1. If**

*‘Î´’*is the declination of the Polaris and*‘Î»’*is the latitude of the place, the azimuth of the Polaris, is- (A)

*cos*

*Î´*/

*cos*

*Î»*

- (B)

*cos*(90° -

*Î´*)/

*cos*(90° -

*Î»*)

- (C)

*sin*(90° -

*Î´*)/

*sin*(90° -

*Î»*)

- (D)

*tan*(90° +

*Î´*)/

*tan*(90° +

*Î»*)

**2. The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is**

- (A) 500 m

- (B) 1000 m

- (C) 1500 m

- (D) 2000 m

**3. 23 cm × 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents**

- (A) 1 m

- (B) 2 m

- (C) 4 m

- (D) 8 m

**4. The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is**

- (A) Altitude and
azimuth system

- (B) Declination
and hour angle system

- (C) Declination
and right ascension system

- (D) Declination
and altitude system

**5. Pick up the correct statement from the following:**

- (A) The star's
movement is apparent due to the actual steady rotation of the earth about its
axis

- (B) The stars
move round in circular concentrated parts

- (C) The
centre of the circular paths of stars is the celestial pole

- (D) All the
above

**6. International Date Line is located along**

- (A) Standard
meridian

- (B) Greenwich
meridian

- (C) Equator

- (D) 180°
longitude

**7. Homologous points are**

- (A) Opposite
corners of a photograph

- (B) Nodal
points of the camera lens

- (C) Corresponding
points on the ground and photograph

- (D) Plumb
points of stereo pair of photographs

**8. The point on the celestial sphere vertically below the observer's position, is called**

- (A) Zenith

- (B) Celestial
point

- (C) Nadir

- (D) Pole

**9. If Î± is the observed altitude, the refraction correction in seconds, is**

- (A) 58" cot
Î±

- (B) 58" tan
Î±

- (C) 58 sin Î±

- (D) 58 cos Î±

**10. Polaris is usually observed for the determination of the azimuth when it is**

- (A) At
culmination

- (B) At
elongation

- (C) Neither
at culmination nor at elongation

- (D) Either
at culmination or at elongation

**11. The station pointer is generally used in**

- (A) Triangulation
surveying

- (B) Astronomical
surveying

- (C) Hydrographical
surveying

- (D) Photogrammetric
surveying

**12. While making astronomical observations, the observer is mainly concerned with**

- (A) The
direction of the vertical, the axis of rotation of the instrument

- (B) The
direction of the poles of the celestial sphere

- (C) The
direction of the star from the instrument

- (D) All
the above

**13. Right ascension of a heavenly body is its equatorial angular distance measured**

- (A) Westward
from the first point of Libra

- (B) Eastward
from the first point of Aeries

- (C) Westward
from the first point of Aeries

- (D) Eastward
from the first point of Libra

**14. The correction applied to the measured base of length ‘**

*L’*is- (A) Tension = (

*P*-

*P*)

_{s}*L*/

*AE*

- (B) Sag =

*L*

^{3}

*w*²/24

*P*² where

*w*is the weight of tape/m

- (C) Slope = (

*h*²/2

*L*) + (

*h*

^{4}/8

*L*

^{3}) where

*h*is height difference of end supports

- (D) All the
above

**15. Pick up the in-correct statement from the following:**

- (A) Apparent
solar time is measured from the lower transit of the true sun

- (B) Mean
solar time is measured from the lower transit of the mean sun

- (C) Sidereal
time is measured from the lower transit of the first point of Aries

- (D) Sidereal
time is measured from the upper transit of the first point of Aries

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