Some of the Questions are :
Q. What is 14 hive?
Q. How would you deploy WebPart Using Windows PowerShell?
Q. What does CMDUI.XML contain?
Q. How does Ribbon works ?
Q. How will you use WebParts or other solutions Created in SharePoint 2007 in SharePoint 2010 ?
Q. What is the advantage in using Windows PowerShell over stsadm in SharePoint 2010 ?
Q. What is REST ? How is it used in SharePoint 2010 ?
Q. What datatype is retured by REST ?

See answers @ below links

Interview Questions for SharePoint 2010 -I

Interview Questions for SharePoint 2010 -II

SharePoint 2010 developer interview questions

Other Interview Questions

SharePoint 2007 Interview Questions for developers

Basic SharePoint 2007 Questions