Hi Roohina. You will not generate much interest or meaningful data using this approach. I suggest you first create a database of relevant stakeholders for your study (what is the audience that should answer the question, can you classify them into different categories to analyze the response rate and look at statistical significance within and between categories), you then need to create a survey monkey and send each stakeholder a personal invitation explaining very briefly the objectives of your study, why they have been selected to answer tit. Good luck.
It's only those who are familiar with the architecture of Karachi that can meaningfully answer the questionnaire. It's best to focus the request for completions on this group