What do you think is the best strategy to apply if there isn’t enough time for testing?
With this given situation, Ad Hoc or Exploratory testing is more feasible to implement. The tester concentrates less on creating test plans, test cases or strategies. It prioritizes testing the major requirements of the software and ensures that the submitted bug 
report is exact so that developers can replicate and resolve the issue quickly.
Why are bugs hard to find?
This could have happened because bugs were overlooked, untested, or unexpected to occur especially if software changes have been made.
What is the importance of designing test cases or strategies early in the software life cycle?
It helps the tester to be more organized in testing and be able to find as many bugs as possible.
What do you think is the criteria of failed software?
Once the software hasn’t achieved the desired goals, functionalities and performance based on the requirements, then it can be classified a failed software.
At what stage does User Acceptance Testing come into picture on software testing?
User Acceptance Testing is the final stage of testing before the release of the software. It is performed by the client or end-user which accepts if the software delivered has met their requirements.
Why do we need documentations for testing?
Documentations for testing (specifications, test designs, test cases, bug reports, manuals etc.) are needed because it contains all the information about the software. It is very helpful especially for testers to know the software development from planning until to its final release.
When will we know that testing is complete?
These are the common factors to determine if the testing is complete:
- When the bugs found are only minor issues and not required or that important.
- When there is no enough time to continue the testing and has approved the quality of the software.
- Software Release (deadline)
- When the cost of continuing the testing and fixing the bug is more than the allocated budget.
How can testers overcome the challenges of software testing?
Testers should be able to identify their personal strengths and weaknesses. They should find ways to learn and improve from their weaknesses. For example, as beginners, they should undergo proper training in testing.
What are the common circumstances that may result to bugs?
- Incorrect requirements provided by the clients.
- Lack of understanding of the requirements.
- Wrong programming code based on the specifications.
- Mistakes on testing and error correction.
How to ensure that a bug has been fixed?
The fixed bug should be retested or undergo successful regression stage. Make sure that the fixed bug is not affected by new software updates.
Also check Software Testing Interview Questions Part1 and Software Testing Interview Questions Part2