Surveying
The sensitivity of a bubble tube can be increased by

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

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
A great circle passing through the place and the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator

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Surveying
Theodolite is an instrument used for

tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles
measurement of horizontal angles only
measurement of vertical angles only

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