Пакет вопросов включает тематический раунд и музыкальный раунд.

Because after пакет in the sense of a set/package of, Russian normally uses the genitive case.

So:

• пакет = a package / set
• вопросов = of questions (genitive plural of вопросы)

This is the same pattern as:

• чашка чая = a cup of tea
• группа студентов = a group of students
• набор упражнений = a set of exercises

So пакет вопросов literally means a package/set of questions.

Вопросов is genitive plural of вопрос.

The basic forms are:

• singular nominative: вопрос
• plural nominative: вопросы
• plural genitive: вопросов

A learner will often meet this form after words meaning a quantity, collection, or container, such as:

• много вопросов = many questions
• список вопросов = a list of questions
• пакет вопросов = a set/package of questions

Включает is the present tense, 3rd person singular, from the imperfective verb включать.

Here it means includes.

Why this form?

• пакет is singular, so the verb is singular: включает
• the sentence states a general fact, so present tense is natural
• Russian often uses the imperfective present for definitions, descriptions, and general statements

Compare:

• Пакет вопросов включает... = The question set includes...
• Пакет вопросов включал... = The question set included... (past)
• Пакет вопросов включит... = The question set will include... (future)

They are in the accusative case, but for masculine inanimate nouns, the accusative often looks exactly like the nominative.

So:

• nominative: тематический раунд
• accusative: тематический раунд

and

• nominative: музыкальный раунд
• accusative: музыкальный раунд

This happens because раунд is masculine and inanimate.

So after включает (which takes a direct object), the phrase is in the accusative, but there is no visible change here.

Because adjectives in Russian must agree with the nouns they describe in:

• gender
• number
• case

Here, both nouns are:

• masculine
• singular
• accusative inanimate (same form as nominative)

So the adjectives also appear in the matching masculine singular form:

• тематический раунд
• музыкальный раунд

If the noun changed, the adjective would change too. For example:

• тематические раунды = thematic rounds
• музыкальная тема = musical theme
• музыкальные вопросы = musical questions

Not necessarily. In this context, пакет often means a set, bundle, or package of materials.

So пакет вопросов is best understood as something like:

• a question set
• a packet of questions
• a bundle of questions

This is common in formal, educational, quiz, and administrative language.

So although пакет can mean a literal bag or packet, here it is being used more abstractly.

Yes. Раунд is a borrowing from English round, and it is common in quiz/game contexts. But depending on the situation, Russian might also use words like:

• тур = round
• этап = stage
• часть = part

For example, in many quiz or competition contexts, тур is extremely common.

So тематический раунд is natural, but in some contexts you might also see тематический тур.

Russian has no articles like English a/an/the.

So:

• пакет вопросов can mean a question set or the question set
• тематический раунд can mean a thematic round or the thematic round, depending on context

Russian relies on context, word order, and general situation to show whether something is definite or indefinite.

The given word order is very natural and neutral:

• Пакет вопросов включает тематический раунд и музыкальный раунд.

Russian word order is more flexible than English, because case endings help show grammatical roles. So other orders are possible, especially for emphasis.

For example:

• Тематический раунд и музыкальный раунд включает пакет вопросов.

This is grammatically possible, but it sounds more marked and less neutral. The original version is the best standard choice for a plain statement.

Because и simply joins two items in a straightforward list:

• тематический раунд
• музыкальный раунд

In Russian, just like in English, you normally do not put a comma before a single и joining two coordinated elements.

So:

• ...включает тематический раунд и музыкальный раунд.

If there were more complicated list structures or repeated conjunctions, punctuation might change, but not in this simple sentence.

Yes. Literally, музыкальный means musical, but in natural English translation, music round is often the better choice in a quiz context.

So depending on context:

• музыкальный раунд = musical round
• more naturally in quiz English: music round

This is a good example of how a word-for-word translation is not always the most natural final translation, even when the Russian grammar is straightforward.