1.
Pick up the correct statement from the following:

2.
The great circle which passes through the zenith, nadir and the poles, is known as

3.
The angle of intersection of the two plane mirrors of an optical square is

4.
An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as

5.
For adjusting a quadrilateral whose both the diagonals are observed, the equations of conditions involved, are

6.
The elevation of the star at elongation is obtained by

7.
If α is the observed altitude, the refraction correction in seconds, is

8.
Dumpy level is most suitable when

9.
If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is

10.
Select the incorrect statement.

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