SNOW-CAD Core Application Development Practice Question
This SNOW-CAD practice question tests your understanding of core application development. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are true about client-callable script includes? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
They must have a function that returns a value.
Option A is correct because client-callable script includes must have at least one function that returns a value. This is required because the GlideAjax API processes the response asynchronously and expects a return value to be sent back to the client via the callback function. Without a return value, the client-side callback would receive undefined or null, breaking the intended data flow.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
They must have a function that returns a value.
Why this is correct
The client script expects a response from the script include.
Related concept
Read the scenario before looking for a memorised answer.
✗
They can only be used in scoped applications.
Why it's wrong here
They can be used in global as well.
✓
They must be accessed using the GlideAjax API.
Why this is correct
GlideAjax is the standard way to call client-callable script includes from client scripts.
Related concept
Read the scenario before looking for a memorised answer.
✗
They cannot be used in UI policies.
Why it's wrong here
They can be used in UI policies via GlideAjax.
✗
They can be called directly without GlideAjax if marked as synchronous.
Why it's wrong here
There is no synchronous call; GlideAjax is async.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the misconception that client-callable script includes can be called synchronously or directly, but the GlideAjax API is mandatory for all client-side calls to server-side script includes, and there is no synchronous alternative.
Detailed technical explanation
How to think about this question
Under the hood, GlideAjax uses XMLHttpRequest to send an asynchronous request to the server, where the script include's method is executed. The response is serialized as JSON and returned to the client, where the callback function processes it. A real-world scenario is populating a dropdown based on a user's selection; the script include fetches data from the database and returns it, and the client-side script updates the options without a page reload.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Core Application Development — This question tests Core Application Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: They must have a function that returns a value. — Option A is correct because client-callable script includes must have at least one function that returns a value. This is required because the GlideAjax API processes the response asynchronously and expects a return value to be sent back to the client via the callback function. Without a return value, the client-side callback would receive undefined or null, breaking the intended data flow.
What should I do if I get this SNOW-CAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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