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The spacing of bars for perforations in coarse screens used for the treatment of sewage, is

At the junction of sewers

Lead acetate test in sewer manhole is done to test the presence of

In septic tanks, decomposition of organic bacteria, is done by

The orthogonal projection of the perspective centre on a tilted photograph, is called

The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a levelThe correct answer is

In triangulation surveys

Polaris is usually observed for the determination of the azimuth when it is

The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is

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