:::: The translation of "Inqulab" from Urdu to English according to Oxford dictionary is "A revolution or uprising" 
 (http://www.oxforddictionaries.com/definition/english/inquilab).. Zindabad also an Urdu word meaning 'may (a person/process) live' (http://www.oxforddictionaries.com/definition/english/zindabad?q=Zindabad).. 
 Zinda, as described in Wiki, is a persian word used in Hindustani (which includes hindi and Urdu) means "to live/living".. 
 (https://en.wikipedia.org/wiki/Zinda  ;  http://hamariweb.com/dictionaries/livin_urdu-meanings.aspx).. "Abad" meaning in Urdu: To propagate..(http://hamariweb.com/dictionaries/populate_urdu-meanings.aspx).. 

 There are also evidences that Bhagat singh had raised two slogans..."Inquilab Zindabad" (Long live revolution) and "Samrajyavad Ka Nash Ho" (Down with imperialism)..Which is given in the article whose link im attaching! The article can be used to further build the biographic page of Bhagat Singh on Wiki..(http://www.jstor.org/discover/10.2307/40276385?uid=3737496&uid;=2&uid;=4&sid;=21104539996713)..  Amarkande