Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one________?

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________?

The minimum depth of foundation in clayey soils is________?

If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is________?

The rate of payment is made for 100 cu m (per % cu m) in case of________?

As compared to fresh river water, sea water contains oxygen________?