устных

устных

"Oral" or "spoken" (related to speech).

Here, the word 'устных' is used as an adjective describing 'вопросов', specifying the type of questions—spoken or oral rather than written.

У нас экзамен будет включать устных вопросов.

Our exam will include oral questions.

In this context, 'устным' modifies 'ответам', indicating the nature of the responses expected in the situation—delivered orally.

Кандидаты должны подготовиться к устным ответам.

Candidates should prepare for oral responses.

Here, 'устных' qualifies 'беседу', describing the conversation as being conducted in spoken form.

Учитель провел устных беседу с учениками.

The teacher held an oral conversation with the students.