Full writing section

Write the full name of the group of compounds mainly responsible for the depletion of ozone layer.

Write the full name of the technique used in locating (a) position of an aeroplane in space, (b) position of an object under water.

A pipe with square cross-section is supplying water to a cistern which was initially empty. The area of cross-section is 4 cm² and the nozzle velocity of water is 40 m/s. The dimensions of the cistern are 10 m x 8 m x 6 m. Then the cistern will be full in

The average marks of section A are 65 and that of section B are 70. If th average marks of both the sections combined are 67, then the ratio of the number of studnts of section A to that of section B is

Write the full name of the technique used in locating an under-water obstacle