In the double application of principle of reversion, the apparent error is
A). equal to true error
B). half the true error
C). two times the true error
D). four times the true error
1. The height displacement on a vertical photograph
3. The shortest distance between two places measured along the surface of the earth, is
6. The resection by two point problem as compared to three point problem
7. The altitude of a circumpolar star is maximum when it is
8. Pick up the correct statement from the following: