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Surveying - Engineering

Q1:

Pick up the correct statement from the following :

A an observation or the resulting reading with the level on a levelling staff is called sight

B a back sight is the first sight taken after setting up the instrument in any position

C the first sight on each change point is a fore sight

D the second sight on each change point is a back sight

E all the above.

ANS:E - all the above.

E is correct.

1. The reading in the leveling staff(BS, IS & FS) are all in the line of sight.

2. BS is always the first reading. Then comes IS or FS.

3. If the instrument is at the turning point then the first reading i.e BS is always considered the previous FS.

4. As it has been said in point 3 the first reading in the turning point is always BS.