A test engineer is analyzing results from a load test. The response time graph shows a steady increase from the start of the test, even at low load levels. The baseline from a previous test on the same environment did not show this pattern. What is the most likely cause?

The load generator is ramping up too quickly.

The test data is not properly indexed, causing slow queries.

A memory leak in the application is causing gradual degradation.

The network is congested from other traffic.

What is the primary purpose of a performance test report?

To replace the need for further performance testing

To list all performance defects found in the application

To communicate key findings and recommendations to stakeholders

To provide a detailed log of all test transactions

Which element is essential for a performance test report to be actionable?

The exact timestamp of every test run

The names of all testers involved

A list of all test environment IP addresses

A recommendation for the next steps

During a load test, the test engineer notices that the application server's disk I/O wait time is consistently high, while CPU and memory utilization are low. Response times are also high. What is the most likely bottleneck?

The application server's CPU is the bottleneck.

The disk I/O subsystem is the bottleneck, causing requests to wait for disk access.

The application server's memory is the bottleneck.

The network is the bottleneck, causing slow data transfer.

A performance test for a new mobile app backend shows that the average response time is 300 ms, which is within the objective. However, the error rate is 5%, and the errors are all '500 Internal Server Error'. What is the most important finding to report?

The error rate is acceptable because it is below 10%.

The errors are likely due to the load test tool, not the application.

The system meets its performance objective, so the test is a success.

The system has a reliability issue that needs investigation, despite meeting the response time objective.

Certified Tester Performance Testing

Domain 2Objective 6

Typical Results of a Performance Test CT-PT Practice Questions (Page 3)

Part of the Performance Measurement Fundamentals domain, which makes up ~28% of our current practice bank. ISTQB does not publish an official question count, but from its 90-minute exam (~35–60 total, ~10–17 in this domain), expect 2–3 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

4concepts

Questions 11–15

11expert · hard
A test engineer is analyzing results from a load test. The response time graph shows a steady increase from the start of the test, even at low load levels. The baseline from a previous test on the same environment did not show this pattern. What is the most likely cause?
Select an answer first
12foundation · easy
What is the primary purpose of a performance test report?
Select an answer first
13foundation · easy
Which element is essential for a performance test report to be actionable?
Select an answer first
14application · medium
During a load test, the test engineer notices that the application server's disk I/O wait time is consistently high, while CPU and memory utilization are low. Response times are also high. What is the most likely bottleneck?
Select an answer first
15application · medium
A performance test for a new mobile app backend shows that the average response time is 300 ms, which is within the objective. However, the error rate is 5%, and the errors are all '500 Internal Server Error'. What is the most important finding to report?
Select an answer first

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