Question

The following bearings were taken in running a closed compass traverse ABCDA .
One would suspect local attraction at stations. Line F.B. B.B.

AB	124${}^{\circ }$30'	304${}^{\circ }$30'
BC	68${}^{\circ }$15'	246${}^{\circ }$0'
CD	310${}^{\circ }$30'	135${}^{\circ }$15'
DA	200${}^{\circ }$15'	17${}^{\circ }$45'

• A. B and C
• B. D and A
• C. A and B
• D. C and D

Answer 1

The correct option is D C and D

If the difference between FB and BB of line is not equal to 180${}^{\circ }$ then local attraction occurs at either or both of the stations (for line CD , FB and BB difference is not equal to 180${}^{\circ }$ but for line AB this difference is equal to 180${}^{\circ }$ and thus there is no local attraction at stations A and B)