# Civil Engineering - Advanced Surveying

### Exercise :: Advanced Surveying - Section 3

16.

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 orienation means reconstructing the basal plane D. Relative orientation of the model is achieved only when five points within the model are cleared of Y-parallax E. All the above.

Explanation:

No answer description available for this question. Let us discuss.

17.

If α is the observed altitude, the refraction correction in seconds, is

 A. 58" cot α B. 58" tan α C. 58 sin α D. 58 cos α.

Explanation:

No answer description available for this question. Let us discuss.

18.

The value of geo-centric parallax to be added to the observed altitude of sun is

 A. 9" cos α B. 9" sin α C. 9" tan α D. 9" cot α.

Explanation:

No answer description available for this question. Let us discuss.

19.

With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

 A. 7 h 00 m B. 7 h 30 m C. 8 h 00 m D. 8 h 30 m E. 9 h 00 m.

Explanation:

No answer description available for this question. Let us discuss.

20.

A star is said to elongate

 A. when the star momentarily moves vertically B. when the angle at the star of the spherical triangle is 90° C. when the star's declination is greater than the observer's latitude D. all the above.