question_answer 20)

  Choose the incorrect statement. (a) The Montreal protocol is associated with the control of emission of ozone depleting substances (b) Methane and carbon dioxide are green house gases (c) Dobson units are used to measure oxygen content (d) Use of incinerators is crucial to disposal of hospital wastes

Answer:

                  (c) Dobson unit is used to express tile column on dessity of trace gases e.g., ozone. On the other hand, oxygen sensors are used to measure the exhaust gas concentration of oxygen.