To add on the fore discussions...
Actual use was never envisaged in the Act. Its "put to use" and not “use”. The phrase "put to use" implies that asset should be installed and available for immediate use. This means if asset is of such nature that it requires wiring and fittings then these should be done to make it eligible for "put to use". However, if the asset was "put to use" for less than 180 days in the year of purchase then only 50% of total depreciation for that year is allowed. But if the asset was not "put to use" in the year of purchase instead "put to use" in year(s) following the year of purchase then it will be eligible for full depreciation at the applicable rate. This is because the restriction of 50% is applicable to the year of purchase only and not after that.
In your case:
Regarding Point A- No depreciation allowed as per the Act for 2009-10, but full depreciation as per applicable rate for 2010-11.
Regarding Point B- Full depreciation as per the applicable rate in the year of purchase provided it is "Put to use" for 180 or more than 180 days. Actual usage is irrelevant for determining the eligibility of depreciation as per the Act
Correct me if I am wrong.
Thanks.