Он случайно выкрикнул ответ.

Выкрикнул is the past tense of выкрикнуть, a perfective verb meaning to blurt out, to shout out, or to cry out.

In this sentence, it suggests that the person suddenly said the answer out loud, often in a quick or uncontrolled way.

Compared with:

• сказал = said
• крикнул = shouted
• выкрикнул = shouted out / blurted out

So выкрикнул is more specific than just said. It gives the idea of the answer being spoken loudly and suddenly.

The ending -л marks the past tense in Russian.

In the singular past tense, Russian verbs also show gender:

• выкрикнул = masculine
• выкрикнула = feminine
• выкрикнуло = neuter

Since он means he, the masculine form выкрикнул is used.

Случайно means accidentally, by accident, or sometimes unintentionally.

Here it tells us that the action was not meant to happen on purpose. So the sentence means that he shouted out the answer unintentionally.

This adverb usually goes before the verb, as in:

• Он случайно выкрикнул ответ.

But Russian word order is flexible, so you may also see:

• Он выкрикнул ответ случайно.

That version is still grammatical, but the first one is more natural in many neutral contexts.

Ответ is the direct object of the verb, so it is in the accusative case.

However, for many masculine inanimate nouns, the accusative singular looks exactly the same as the nominative singular.

So:

• nominative: ответ
• accusative: ответ

That is why it does not visibly change.

Compare this with a feminine noun, where the accusative often looks different:

• книга → книгу

Yes, it is natural.

Russian commonly uses a verb like выкрикнуть with a direct object such as:

• выкрикнуть имя = to shout out a name
• выкрикнуть ответ = to shout out an answer
• выкрикнуть что-то = to shout something out

So выкрикнул ответ is a normal and idiomatic phrase.

Выкрикнул comes from the perfective verb выкрикнуть.

Perfective verbs usually present an action as:

• completed
• single
• bounded as one whole event

That fits this sentence well, because it refers to one completed action: he blurted out the answer once.

The imperfective partner would usually be выкрикивать:

• Он выкрикивал ответы. = He was shouting out answers / used to shout out answers.

So in your sentence, the perfective form is used because it describes one specific event.

Yes, sometimes it could be omitted if the subject is already clear from context.

For example:

• Случайно выкрикнул ответ.

This can work in conversation or in a narrative where everyone already knows who is being talked about.

However, Russian uses subject pronouns more often than some learners expect, especially when the speaker wants clarity or emphasis. In a standalone sentence, он is very natural.

Yes. Russian word order is flexible, and changing it can shift emphasis.

Some possible versions:

• Он случайно выкрикнул ответ. = neutral
• Он выкрикнул ответ случайно. = stronger focus on the fact that it was accidental
• Ответ он случайно выкрикнул. = stronger focus on the answer
• Случайно он выкрикнул ответ. = emphasis on accidentally

The original order is a very natural neutral version.

The main stress is:

• Он случа́йно вы́крикнул отве́т.

A rough pronunciation guide:

• он = on
• случа́йно = sloo-CHAI-na
• вы́крикнул = VY-kreek-nool
• отве́т = at-VYET

A few useful notes:

• Russian о often sounds more like a when unstressed.
• Stress is unpredictable in Russian, so it is worth learning it with each word.

Both can mean accidentally blurted out the answer.

But there is a small nuance:

• случайно is the more common, neutral everyday word for accidentally
• нечаянно also means accidentally, but can sound a little more literary, emotional, or old-fashioned depending on context

So:

• Он случайно выкрикнул ответ. = very standard and neutral
• Он нечаянно выкрикнул ответ. = also correct, but with a slightly different tone

Usually yes, or at least that the answer came out suddenly and audibly.

Выкрикнуть often suggests:

• a loud utterance
• a sudden outburst
• something said before the speaker fully controlled himself

So depending on context, it may mean:

• he literally shouted the answer
• he blurted the answer out in a way that stood out

It does not always mean dramatic screaming, but it is definitely stronger than just said.