(1A) The notification under sub section (1) shall also specify the date, (such date not being less than thirty days from the date of publication of the notification) on or before which, and the manner in which, objections to the proposed acqui sition may be made, under section 5A. (2) On the publication of such notification it shah be lawful for any Officer, either generally or specially authorized by such Government or by the Deputy Commissioner in this behalf, and for his servants and workmento enter upon and survey and take levels of the land; to dig or bore into the sub soil; to do all other acts necessary to ascertain whether the land is adapted for such purpose; to set out the boundaries of the land proposed to be taken and the intended line of work (if any) proposed to be made thereon; to mark such levels, boundaries and line by placing marks and cutting trenches; and where otherwise the survey cannot be completed and the levels taken and the boundaries and line marked, to cut down and clear away any part of any standing crop, fence or jungle: Provided that no person shall enter into any building or upon any enclosed court or garden attached to a dwelling house (unless with the con sent of .the occupier thereof) without previously giving such occupier at least seven days notice in writing of his intention to do so.