PCA Promql Practice Question
A user executes an instant query for a metric without providing a range vector. What type of vector is returned by default?
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
✓
Instant vector
An instant vector evaluates to a single data point per time series at the current evaluation timestamp.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
String
Why it's wrong here
String vectors are not a standard query return type for metric queries.
- ✗
Range vector
Why it's wrong here
Range vectors require bracket notation specifying a time duration.
- ✗
Scalar
Why it's wrong here
Scalars are single numerical values without time series context.
- ✓
Instant vector
Why this is correct
Correct. Queries without a range selector return instant vectors.
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 August 2026 · checked against the official CNCF / Linux Foundation exam blueprint
This PCA practice question is part of Courseiva's free CNCF / Linux Foundation 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 PCA exam.