Need Feedback Regarding My Summative UX Study Plan?

I plan on conducting a Summative Study/Survey, I've picked up LinkedIn as my choice of product/platform. I am planning to use the Questionnaire approach to collect quantitative data for my study.

Title: "A Summative Usability Survey on Effectiveness Between the LinkedIn’s Web Application-and Android Application"

My questionnaire

    Survey (questionnaires & interview questions)
    Questions (Draft)
    1.  What is your current title ?
    [ ] Student
    [ ] Professional 
    [ ] Teacher
    [ ] Unemployed 
    [ ] Other
    2.  If you answered Professional or Other in the previous question, 
please write your current title? (e.g. Analyst or Physicist)
    3.  What is your subscription status? 
    [ ] Freemium
    [ ] Premium
    [ ] I do not use LinkedIn 
    4.  If your answer in the previous question was Premium, which premium subscription do you use? (Student Premium, Career Premium)
    5.  What’s your mainly use of LinkedIn ? (Build network, Job Search, Stay Updated with the Industry, Find business events, or Other)
    6.  If you answered Other in the previous question, please write what is you main use of the LinkedIn ? (Keep it short and concise)
    7.  Which age group do you belong to?
    [ ] < 20
    [ ] 20-24
    [ ] 25-29
    [ ] 30-34
    [ ] 35-39
    [ ] 40-44
    [ ] 45-49
    [ ] 50-54
    [ ] 55-59
    [ ] 60-64
    [ ] > 64
    8.  What is your gender? (M, F, decline to answer)
    9.  What is your preferred LinkedIn application ? (Web, Mobile)
    10. How many hours each day do you use LinkedIn ? (0-1, 1-2, 2-3, 3-4, 4-5, > 5)
    11. Are there any features missing that you’d like to see introduced ? (Open question)
    12. Is there anything you dislike about LinkedIn ? (Open question)
    13. How would you rate the overall satisfaction of the usage of LinkedIn’s services ?

I would like some feedback on this. Does this seem good, or is there something better.