# Practice Test: Question Set - 13

**1. At western elongation, the pole star moves**

- (A) Eastward

- (B) Westward

- (C) Northward

- (D) Southward

**2. The difference of parallax for a given difference in elevation is independent of**

- (A) Focal length
of the camera

- (B) Overall size
of the photo graphs

- (C) Percentage
of overlap

- (D) All the
above

**3. The maximum error in radial line assumption, is**

- (A)

*h*/

*H f tan*θ

- (B)

*h*/

*H*

*f² tan*θ

- (C)

*h*/

*H f² sin*θ

- (D)

*h*/

*H f cos*θ

**4. The great circle whose plane is perpendicular to the axis of rotation of the earth, is called**

- (A) Equator

- (B) Terrestrial
equator

- (C) 0° latitude

- (D) All the
above

**5. The rate of change of parallax**

*dp*/*dh*with respect to change in*h*, may be expressed as- (A)

*fB*/(

*H*-

*h*)

- (B)

*fB*/(

*H*-

*h*)

^{2}

- (C)

*fB*/(

*H*+

*h*)

- (D)

*fB*/(

*H*+

*h*)

^{2}

**6. At lower culmination, the pole star moves**

- (A) Eastward

- (B) Westward

- (C) Northward

- (D) Southward

**7. The principal plane contains**

- (A) Nadir point

- (B) Iso-centre

- (C) Principal
point

- (D) All the
above

**8. If a star whose declination is 60° N culminates at zenith, its altitude at the lower culmination, is**

- (A) 10°

- (B) 20°

- (C) 30°

- (D) 40°

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

- (A) The plane
passing through the perspective centre of a stereo pair and a ground point, is
known as basal plane

- (B) Each
pair of image points on stereo pair have their own basal plane

- (C) Relative
orientation means reconstructing the basal plane

- (D) All the
above

**10. The Polaris describes a small circle round the pole whose radius is approximately**

- (A) 1°

- (B) 2°

- (C) 3°

- (D) 4°

**11. The normal longitudinal overlap is generally kept**

- (A) 50 %

- (B) 60 %

- (C) 70 %

- (D) 75 %

**12. In a truly vertical photograph,**

- (A) Principal
point coincides the isocenter

- (B) Iso-centre coincides
the plumb point

- (C) Plumb point
coincides the principal point

- (D) All the
above

**13. Parallax bar measures**

- (A) Parallax

- (B) Height

- (C) Parallax
difference

- (D) Height
difference

**14. The time interval between successive transits of the moon, is**

- (A) 24 hours 10
minutes

- (B) 20 hours 25
minutes

- (C) 24
hours 50 minutes

- (D) 23 hours 50
minutes

**15. From the principal point the horizon point lies on the principal line at a distance of**

- (A)

*f*

*tan*θ

- (B)

*f*

*sin*θ

- (C)

*f*

*cot*θ

- (D)

*f*

*cos*θ

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