PK0-005 Project Life Cycle Practice Question
In a network diagram, Activity B has a duration of 5 days. Its predecessor is Activity A (duration 3 days) with a finish-to-start relationship. Activity C (duration 4 days) has a start-to-start relationship with Activity B with a 2-day lag. What is the earliest day Activity C can start?
⚠ Common exam trap
PK0-005 often tests the confusion between dependency types and the effect of lag, especially misapplying finish-to-start logic to a start-to-start relationship or miscalculating the start day of the predecessor.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Day 6
Activity A finishes on day 3 (assuming day 1 start). Activity B, with a finish-to-start dependency on A, starts on day 4 and has a duration of 5 days, so it finishes on day 8. Activity C has a start-to-start relationship with B with a 2-day lag, meaning C can start 2 days after B starts. B starts on day 4, so C can start on day 6. Therefore, the earliest day Activity C can start is Day 6.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Day 6
Why this is correct
Activity B starts after A finishes, so B begins on day 4 and runs to day 8. The start-to-start relationship with a 2-day lag lets C begin two days after B starts: day 4 plus 2 equals day 6. Day 6 is therefore the earliest start.
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Day 5
Why it's wrong here
Day 5 adds the 2-day lag to A's 3-day duration, but the lag attaches to B's start, not A's finish. It is tempting because it looks like a straightforward predecessor-plus-lag calculation, which would hold if C were linked to A rather than to B.
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Day 7
Why it's wrong here
Day 7 misreads the relationship: start-to-start with a 2-day lag means C starts two days after B begins, not after B finishes. It is tempting because it treats the lag as applying to B's completion, which would be correct for a finish-to-start relationship with a 2-day lag.
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Day 8
Why it's wrong here
Day 8 adds the 2-day lag to B's finish at day 8, treating start-to-start as finish-to-start. It is tempting because it correctly computes B's completion, and that figure would be the right answer if the relationship were finish-to-start with a 2-day lag.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This PK0-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PK0-005 exam.