Hello Raju,

            Here are some UI Acton's important ques which might be asked in interview:

1. Types of UI Action
2. Send notifications using UI Action
3. On which side UI Acton work
4. Give scenarios for UI Action
5. can we write only client side script in UI Action
6. elaborate gsft submit
7. did you overridden UI Action
8. what is visibility in UI Action
9. what are restrictions for UI Action
10. How you can redirect URL using UI action
11. can we use UI action for making field read only
12. can we call UI Action in Business rules

Hope these Question will help You

Mark my response helpful and correct if it is satisfactory.

                         ALL THE BEST!!!

Regards,

Ajim.