Taxation on infrastructure bonds bought in 2011/12

1. Being cumulative in nature, the interest earned over these bonds is to be offered u/h. IFOS. (TDS of 10% deducted u/s. 194A).

2. & 3. not applicable.

1. According to sec 10(47), any income infrastructure debt fund set up by the Central Government alone will be exempt from payment of tax. 
2. In your case, it is an L&T infra bond and whatever the income earned on buyback of such bond will be subject to tax under the head Income from Other Sources. 
3. I don't think there will not be any deductions available u/s 57 with respect to the above interest income. 
4. Interest column in ITR -2 be just filed. If it is possible to specify the nature of the bond, do specify. 
Please correct me if the above solution has an alternative view.