"There are altogether 15 questions in the test."

Translation: 考试一共有十五题。

[ZhangC1459]

问题 is just as valid in this context as 题 in my opinion

[NasuSamaruk0]

Yes, if you express "questions" in full compound form.

[WillowsofXihu]

Except that 问题 would actually be informal in this context (e.g. students talking about the test, not what the teacher would say at the start or what would be written on the test instructions, which would both be ”十五题“), and would require a preceding 个.

[deactivated user]

Why is a measure word not required? Or is 题 itself a measure word?