Questionnaire on attrition analysis - how much question i should ask?

bhashu god
Hello everyone i am pursuing MBA from doon business school dehradun uttrakhand. I am doing my summer internship and i select attrition analysis as my topic and i want to make a questionnaire on it please help me on following points.
1. what question i should ask
2. how much question i should ask
please share any questionnaire on it
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