1. What are permission sets and how do they differ from profiles?
2. When will you use profile and permission sets together?
3. Difference between roles and profiles?
4. What are controllers?
5. What are extensions?
6. Difference between controllers and extensions?
7. What is a standard controller and custom controller?
8. What is the Minimum number of queries required to query for 2 level, 3 level relationships?
9. Define recursive triggers?How will you avoid recursive triggers?
10. What is use of with sharing and without sharing in Apex class?
11. What deployment methods have you used? List advantages and disadvantages of each?
12. How will you load data for a child object?
13. Difference between a look up and master-detail relationship?
14. Explain, the way you will query child from parent and parent from child
15. What are sharing rules, when do you used sharing rules?
16. Explain lead to opportunity conversion?
17. What are record types? Why are the record types used?
18. When is page layout assignment used?
19. How many types of salesforce licenses are there? What are the limits?
20. What is batch apex? Why do we use batch apex?
21. What is the use of @future annotation?
22. What are test classes, what is the test coverage you need to move a code into production?
23. Can I directly change code in salesforce production org?
24. How do I log a case with salesforce?
25. How can I change owner for multiple cases at once (example – from Rob to John)
26. Difference between a workflow rule and approval process?
27. What is the order of execution of workflow rules, validation rules, triggers?
28. Explain
    Salesforce.com security implementation with respect to Profiles, Roles
    and Hierarchy, Sharing rules, OWD(org wide default settings)? Also,
    specify which is the most restrictive security setting?
29. What are custom report types?
30. What are different types of reports you can create?
31. What is Trigger?old and Trigger?New
32. What is ApexPages?addMessage
33. How is a pdf generated using visual force page?
34. How can I redirect user to a page after processing is completed in the controller/extension?
35. What are custom settings? When will you use custom settings?
36. What are Action Support, Action Function and Action Poller used for?
37. How can one read parameter values through the URL in Apex?

Note:
Search my blog for answers.