# 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)

*πR*²

*E*/90°

- (B)

*πR*²

*E*/180°

- (C)

*πR*²

*E*/270°

- (D)

*πR*²

*E*/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*/

*H*

*sec*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

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