Surveying
The sensitivity of a bubble tube can be increased by

increasing the viscosity of liquid
decreasing the radius of curvature of tube
increasing the diameter of the tube
decreasing the length of bubble

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Surveying
For a line AB

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

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