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ISTQB

ISTQB Certified Tester - Performance Testing Free Sample Questions

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CT-PT Sample Questions

  1. Q1

    A financial organization is planning a performance test for a new trading platform. The stakeholder requirement states that the system must remain stable and recover gracefully when traffic exceeds 500% of the expected peak load for short durations. Which specific performance test type should be prioritized to verify this requirement?

    Show answer & explanation

    Correct answer: B

    Spike testing specifically evaluates a system's ability to handle sudden, extreme bursts of load and verify recovery. While stress testing pushes limits, spike testing focuses on the rapid increase and decrease (impulse) of load.

    Timed and flashcard mode in the Simulator
  2. Q2

    During the risk assessment phase for a medical records system, the team identifies a risk related to 'Resource Utilization.' Which of the following potential failures best aligns with this risk category?

    Show answer & explanation

    Correct answer: B

    Resource utilization risks involve the consumption of system resources (CPU, Memory, Disk, Network). A memory leak leading to a crash is a direct failure of resource management/utilization.

    Timed and flashcard mode in the Simulator
  3. Q3

    Which of the following statements accurately distinguishes between 'Performance Efficiency' and 'Reliability' according to ISO 25010 standards in the context of performance testing?

    Show answer & explanation

    Correct answer: A

    Performance Efficiency (Time Behavior, Resource Utilization, Capacity) is about how well the system performs relative to resources. Reliability (Maturity, Availability, Fault Tolerance, Recoverability) is about maintaining service levels over time.

    Timed and flashcard mode in the Simulator
  4. Q4

    True or False: A system that meets all functional requirements will automatically satisfy performance efficiency requirements if the hardware is sufficiently powerful.

    Show answer & explanation

    Correct answer: B

    False. Poor software architecture or inefficient code can cause performance failures regardless of hardware power. Functional correctness does not imply performance efficiency.

    Timed and flashcard mode in the Simulator
  5. Q5

    A performance tester is analyzing response time data. The dataset contains several extreme outliers caused by network hiccups. Which statistical metric would provide the MOST accurate representation of the 'typical' user experience?

    Show answer & explanation

    Correct answer: B

    The Median is less sensitive to outliers than the Mean. While the 90th percentile is good for worst-case analysis, the Median represents the central tendency of the 'typical' user when data is skewed.

    Timed and flashcard mode in the Simulator
  6. Q6Multiple answers

    Select TWO key metrics that are primarily collected from the 'Client-Side' during a web application performance test. (Select TWO)

    Show answer & explanation

    Correct answers: A, C

    TTFB is measured from the client perspective (time from request sent to first byte received).

    DOM Interactive is a browser-based metric indicating when the page becomes interactive for the user.

    Timed and flashcard mode in the Simulator
  7. Q7

    You are monitoring a system where the 'Throughput' curve has flattened despite an increase in 'Concurrent Users', while 'Response Time' has started to increase exponentially. What does this behavior indicate?

    Show answer & explanation

    Correct answer: A

    When throughput plateaus and response time spikes as load increases, it indicates a resource bottleneck (saturation point) has been reached. Additional requests are queuing.

    Timed and flashcard mode in the Simulator
  8. Q8

    In an Agile development environment utilizing CI/CD, which performance testing approach is most appropriate for providing rapid feedback to developers on code changes?

    Show answer & explanation

    Correct answer: B

    In CI/CD, speed is critical. Small, focused component tests (micro-benchmarks) provide immediate feedback on regression without the time cost of full environment load tests.

    Timed and flashcard mode in the Simulator
  9. Q9

    Which of the following describes the 'Shift-Left' approach to performance testing?

    Show answer & explanation

    Correct answer: C

    Shift-Left means moving testing activities earlier in the timeline (to the left on a Gantt chart) to catch issues when they are cheaper to fix.

    Timed and flashcard mode in the Simulator
  10. Q10

    Case Study:

    Company Context: TechFin Solutions is migrating a monolithic legacy banking application to microservices on Kubernetes.
    Current Situation: The development team works in 2-week sprints. Performance testing has historically been a "hardening phase" activity done once every 6 months.
    Requirement: The CTO demands that performance regressions be caught within the sprint they are introduced.

    Which strategy best addresses this requirement?

    Show answer & explanation

    Correct answer: A

    To catch regressions within a sprint, automated performance tests must run frequently (e.g., nightly) as part of the CI pipeline. Waiting for a hardening phase is too late.

    Timed and flashcard mode in the Simulator

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