Section 120(1)(a) in The Delhi School Education Rules, 1973
(a)the disciplinary authority shall frame definite charges on the basis of the allegation on which the inquiry is proposed to be held and a copy of the charges together with the statement of the allegations on which they are based shall be furnished to the employee and he shall be required to submit within such time as may be specified by the disciplinary authority, but not later than two weeks, a written statement of his defence and also to state whether he desires to be heard in person;