# Civil Engineering - Surveying

Exercise : Surveying - Section 8
11.
The surface of zero elevation around the earth, which is slightly irregular and curved, is known as
mean sea level
geoid surface
level surface
horizontal surface.
Explanation:
No answer description is available. Let's discuss.

12.
The lens equation is applicable
when the thickness of the lens is small
only to conjugate distances along the principal axis
the computed quantities are accurate enough for geometrical optics of simple distances
all the above.
Explanation:
No answer description is available. Let's discuss.

13.
The representation of general topography of a very flat terrain is possible only
by drawing contours at large interval
by drawing contours at small interval
by giving spot levels at large interval
by giving spot levels to salient features at close interval.
Explanation:
No answer description is available. Let's discuss.

14.
The bearing of line AB is 152° 30' and angle ABC measured clockwise is 124° 28'. The bearing of BC is
27° 52'
96° 58'
148° 08'
186° 58'