Surveying
If the length of a chain is found to be short on testing, it can be adjusted by

closing the joints of the rings if opened out
All of these
removing one or more small circular rings
straightening the links

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Plumb points of stereo pair of photographs
Opposite corners of a photograph
Nodal points of the camera lens

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
the forebearing of AB and back bearing of AB differ by 180°
none is correct
both (A) and (B) are correct

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