Geværet er låst.

Because geværet is the definite singular form: the rifle / the gun.

• et gevær = a rifle / a gun
• geværet = the rifle / the gun

In Norwegian, the definite article is usually added to the end of the noun as a suffix, instead of being a separate word like the in English.

Gevær is a neuter noun in Norwegian.

That matters because neuter nouns often use:

• et in the indefinite singular: et gevær
• -et in the definite singular: geværet

It also affects agreement with adjectives and participle-like forms, which is why you see låst with -t.

Because it agrees with a neuter singular noun.

Here, geværet is neuter singular, so the form is:

• et gevær er låst

Compare:

• Døren er låst = The door is locked
  (dør is usually common gender, so no -t)
• Vinduet er låst = The window is locked
  (vindu is neuter, so låst)

So the -t is part of the normal agreement pattern.

In this sentence, it behaves like a predicate adjective, but it comes from the verb å låse (to lock).

So you can think of låst as a past participle used adjectivally:

• å låse = to lock
• låst = locked

In Geværet er låst, the focus is usually on the state of the rifle: it is in a locked condition.

Because er låst usually describes a state, while blir låst describes a change or an event.

• Geværet er låst = the rifle is locked
  (it is in that state)
• Geværet blir låst = the rifle is getting locked / is being locked
  (the action is happening)

This is a very common distinction in Norwegian:

• er + participle/adjective = state
• blir + participle = becomes / is being

Not directly. The sentence mainly tells you the resulting condition: the rifle is locked.

It may imply that someone locked it earlier, but the sentence itself does not focus on who did it or when. If you wanted to emphasize the action more clearly, Norwegian might use something like:

• Noen har låst geværet. = Someone has locked the rifle.

Sometimes learners think of er låst as a passive because English uses is locked, which can look passive. But in Norwegian, this kind of sentence is often best understood as describing a state.

So while there is a historical link to the participle of a verb, in everyday grammar it is often more natural to treat er låst as is in a locked state.

If you want a clearer passive/event meaning, Norwegian often uses:

• Geværet blir låst. = The rifle is being locked / gets locked
• Geværet låses. = The rifle is being locked / gets locked

Yes, depending on context.

More specifically, gevær usually refers to a rifle or long gun, but in some translations learners may see gun as a broader English equivalent. The exact best translation depends on context.

So if you are learning vocabulary, it is safest to remember:

• gevær = usually rifle

The verb is å låse (to lock).

Useful related forms:

• å låse = to lock
• låser = locks / is locking
• låste = locked
• har låst = have/has locked
• låst = locked

So låst is the form used here after er.

A simple learner-friendly approximation is:

• geh-VAIR-et er lost

A few pronunciation notes:

• æ in geværet is a front vowel, somewhat like the a in some pronunciations of cat, but not exactly the same.
• geværet has the stress on the væ syllable.
• låst has a long å sound, somewhat like the vowel in British law, though not identical.

You do not need perfect pronunciation at first; the most important thing is getting the stress in geVÆret roughly right.

Yes, but it changes the meaning.

• Geværet er låst = The rifle is locked
• Et gevær er låst = A rifle is locked

So the original sentence refers to a specific rifle, not just any rifle.

The plural would be:

• Geværene er låst. = The rifles are locked

Notice two things:

1. geværene is the definite plural form of gevær
2. låst does not change here

That may seem surprising if you expect a separate plural ending on the adjective, but with this kind of past-participle form, låst stays the same in plural predicate use.

Yes. In a main statement, Norwegian normally uses:

• Geværet er låst.

But in a yes/no question, the verb comes first:

• Er geværet låst? = Is the rifle locked?

And in a subordinate clause, the word order changes too:

• Jeg vet at geværet er låst. = I know that the rifle is locked.

So this sentence is a good example of normal main-clause word order: subject + verb + complement.