Penalty for non-compliance: refusal to answer, sign, or produce documents triggers prescribed fines with procedural hearing safeguards. Substitutes section 17A to impose penalties for refusal to answer questions, sign required statements, or attend and produce books or documents in response to a summons, with a reasonable-cause exception for failure to attend or produce. It also prescribes a daily penalty for failure to furnish statements or information required by the Assessing Officer, subject to reasonable cause. Penalty imposition is allocated to appropriate gift-tax authorities or to the Deputy Director/Deputy Commissioner, and no order may be made without hearing or reasonable opportunity to be heard. 'Gift-tax authority' is defined to include specified officers when exercising civil court powers under section 36(1).