
vernehmen
to question
(Technical language, especially legal) To officially question or interrogate a person, especially a witness or suspect.
Die Polizei wird den Zeugen morgen vernehmen.
The police will question the witness tomorrow.
to question / to perceive
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to question
(Technical language, especially legal) To officially question or interrogate a person, especially a witness or suspect.
Die Polizei wird den Zeugen morgen vernehmen.
The police will question the witness tomorrow.

to perceive
(Elevated, becoming old-fashioned) To hear or perceive a sound, noise, or voice.
Plötzlich vernahm er ein leises Knistern im Gebüsch.
Suddenly he perceived a quiet crackling in the bushes.
'Vernehmen' (to question / to perceive) is an inseparable verb. The prefix 'ver-' remains firmly attached to the verb stem 'nehmen' in all tenses and sentence constructions.
Der Richter vernahm den Angeklagten den ganzen Vormittag.
The judge questioned the defendant all morning.
The verb is derived from 'nehmen' (to take). The prefix 'ver-' gives the word the meaning of taking in or learning something through questioning or through hearing.
Man konnte aus der Ferne laute Rufe vernehmen.
Loud calls could be perceived from a distance.
This meaning of 'vernehmen' (to question) belongs to the technical language of the justice system and police. In everyday language, words like 'befragen' (to question) or 'verhören' (to interrogate) are used instead.
Der Beschuldigte wurde von der Staatsanwaltschaft vernommen.
The suspect was questioned by the public prosecutor's office.
In this meaning, 'vernehmen' (to question) always takes an accusative object that refers to the person being questioned. The person's role is often added with 'als' (as), for example 'jemanden als Zeugen vernehmen' (to question someone as a witness).
Die Kriminalpolizei wird sie als Zeugin vernehmen.
The criminal police will question her as a witness.
In the meaning of 'hören' (to hear), 'vernehmen' (to perceive) is elevated and somewhat old-fashioned. It is found mainly in literature or very formal language to describe the conscious perception of a sound.
In der Stille der Nacht vernahm sie plötzlich Schritte im Flur.
In the silence of the night, she suddenly perceived footsteps in the hallway.
to hear / to listen
Both words can mean perceiving a noise or voice with one’s ears. „Hören“ is the neutral and usual word today, while „vernehmen“ sounds elevated or old-fashioned in this meaning. „Hören“ is therefore usually used in everyday situations, while „vernehmen“ may also appear in older or deliberately elevated texts.

In der alten Erzählung vernahm der Wanderer ein leises Geräusch im Wald.
In the old story, the traveler heard a faint noise in the forest.
Ich hörte im Flur ein leises Geräusch.
I heard a faint noise in the hallway.