In the case of a student who is selected as a member of the N.C.C. to participate in the annual N.C.C. Camps or is deputed to undertake Civil Defence work and allied duties or in the case of a student who is enrolled in the National Service Scheme and is deputed to various public assignments by or with the approval of the Head of the institution concerned or a student who is selected to participate in sports or other activities organised by the Inter-University Board or in national or international fixtures in games and sports approved by the Vice-Chancellor or a student who is required to represent the University at the Inter-University Youth Festival, or a student who is required to participate in periodical training in the Territorial Army or a student who is deputed by the College to take part in Inter-College sports or fixtures, debates, seminars, symposia or social work projects or a student who is required to represent the College concerned in debates and other extra-curricular activities held in other Universities or such other activities approved by the Vice-Chancellor for this purpose, in calculating the total number of lectures etc. delivered in the College, or in the University, as the case may be, for his course of study in each academic year, the number of lectures etc., in each subject delivered, during the period of absence for that purpose shall not be taken into account.