Top three:

1. https://vlsiuniverse.blogspot.com/p/interview-questions.html

2. http://www.hitequest.com/Hardware/El_hardware.htm

3. http://www.vlsiinterviewquestions.org

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Other:

1. https://asicdigitaldesign.wordpress.com/category/interview-questions/

2. http://www.verilogpro.com/

3. http://vlsichip.blogspot.com

4. http://www.discovercircuits.com/F/freqdivider.htm

5. http://www.asic.co.in/Index_files/verilog_interview_questions.htm

6. https://www.quora.com/What-are-Digital-Logic-Design-interview-questions

7. http://www.vlsiip.com/misc/q.html

8. http://www.asic-world.com/digital/questions.html

9. http://www.techinterview.org/

10. http://www.angelfire.com/in/rajesh52/quest.html

11. http://only-vlsi.blogspot.com/2009/01/digital-design-interview-questions.html

12. http://www.fullchipdesign.com/digtial_interview_entry_level_jobs.htm

13. https://www.edaboard.com/search.php?searchid=1214590

14. https://groups.google.com/forum/#!forum/vlsi-design-forum

15. https://www.edaboard.com/showthread.php?116973-A-Lot-Interview-questions-With-Resposes&highlight=vlsi+interview+questions

16. http://asic-soc.blogspot.com/

17. https://groups.google.com/forum/?fromgroups=#!forum/vlsi-design-forum

18. https://www.scribd.com/doc/2910484/VLSI-CMOS-interview-questions-and-answers

19. https://cdcnitw.files.wordpress.com/2013/04/vlsi_questions.pdf

20. https://www.careerride.com/vlsi-interview-questions.aspx

21. http://www.vlsi-expert.com/2016/12/5-steps-to-crack-vlsi-interview.html

22. http://asic-design-for-test.blogspot.com/

23. https://chipress.co/blog/interview-questions/

24. http://www.sunburst-design.com/papers/CummingsSNUG2008Boston_CDC.pdf

25. http://vlsimentor.com/99/interview-questions-in-verilog-digital/

26. http://www.theworker.co.il/interview/role/%D7%9E%D7%94%D7%A0%D7%93%D7%A1%20%D7%A8%D7%9B%D7%99%D7%91%D7%99%D7%9D%20VLSI/rev/page/4

27. https://www.jobhunt.co.il/f/%D7%A9%D7%97%D7%96%D7%95%D7%A8%D7%99-%D7%A8%D7%90%D7%99%D7%95%D7%A0%D7%95%D7%AA-%D7%A2%D7%91%D7%95%D7%93%D7%94/page200.html

28. https://www.edaboard.com/showthread.php?116973-A-Lot-Interview-questions-With-Resposes&highlight=vlsi%20interview%20questions

29. http://asic-soc.blogspot.com/p/low-power-vlsi.html

30. ​https://www.edaboard.com/showthread.php?116973-A-Lot-Interview-questions-With-Resposes&highlight=vlsi%20interview%20questions