1. Explain “Mixed_DML_Operation” error.

2. Do Apex test methods persist data to the Salesforce.com data store?

3. Is it necessary to write Apex test classes for custom controllers?

4. Explain Apex heap limit?

5. Is it possible to bypass Apex governor limits?

6. Which governor limit you used to face frequently?

7. Explain the relationship between Account and Contact?

8. Briefly explain view state in Apex?

9. How to enable view state in development mode?

10. How to bulkify trigger?