Quiz pubowy sprawdza wiedzę ogólną, a uczestnik musi uzasadnić odpowiedź.

In Polish, pubowy is an adjective made from pub + -owy, so quiz pubowy literally means a pub-type quiz or a pub quiz.

Polish often uses an adjective where English uses a noun + noun combination. So instead of pub quiz, Polish naturally says quiz pubowy.

Also, adjective position in Polish is flexible, but with this kind of category/type description, placing the adjective after the noun is quite natural.

Because it is the direct object of sprawdza (checks / tests), so it has to be in the accusative case.

The dictionary form is:

• wiedza ogólna = general knowledge

But in this sentence:

• sprawdza wiedzę ogólną = tests general knowledge

Both words change because wiedza ogólna is a feminine noun phrase in the accusative singular:

• wiedza → wiedzę
• ogólna → ogólną

The basic dictionary phrase is wiedza ogólna, and this is a very common fixed expression in Polish for general knowledge.

Although adjectives in Polish often come before the noun, they can also come after it, especially in established expressions or when they classify the noun rather than just describe it.

So wiedza ogólna is just the normal phrase here. You may also see adjective placement vary in Polish, but this version sounds standard and natural.

Here a links two clauses:

• Quiz pubowy sprawdza wiedzę ogólną
• uczestnik musi uzasadnić odpowiedź

In English, a can often be translated as and, but it often carries a slight sense of contrast or comparison, something like:

• and
• while
• whereas

So here it is basically and, but with a slight sense of moving to the next related point: the quiz tests general knowledge, and the participant must justify the answer.

It is weaker and more neutral than ale (but).

Not necessarily. In Polish, the singular is often used in a generic sense, meaning any participant or each participant.

So:

• uczestnik musi uzasadnić odpowiedź

can mean:

• the participant must justify the answer
• each participant must justify their answer
• a participant must justify the answer

It is similar to English sentences like A student must show their work, where the singular refers to people in general.

This is about aspect.

• uzasadnić = perfective
• uzasadniać = imperfective

After musi, Polish often uses the perfective infinitive when talking about a required completed action. Here the idea is that the participant must produce one full justification for the answer.

So:

• musi uzasadnić odpowiedź = must justify the answer / must give a justification

If you said musi uzasadniać, it would sound more like an ongoing, repeated, or habitual process of justifying.

It is accusative, but for this noun the nominative and accusative singular happen to look the same.

The dictionary form is:

• odpowiedź = answer

In this sentence it is the object of uzasadnić, so it is accusative:

• uzasadnić odpowiedź = justify the answer

Many feminine nouns in Polish do change in the accusative, but some, especially nouns of this type, have the same form in nominative and accusative singular.

Sprawdza is 3rd person singular present tense of sprawdzać.

So literally it means:

• checks
• tests
• verifies

In this sentence, the present tense is used to describe a general fact or rule, not something happening only right now. English often does the same:

• A pub quiz tests general knowledge.

Yes, quiz is used in Polish, even though it is a borrowing.

It is treated as a masculine noun. In this sentence it is in the nominative singular:

• quiz pubowy

It is commonly pronounced roughly like kwiz.

So even though the spelling looks English, in Polish it is used as an ordinary noun in everyday language.

Because a joins two separate clauses, each with its own verb:

• Quiz pubowy sprawdza wiedzę ogólną
• uczestnik musi uzasadnić odpowiedź

In Polish, when a connects clauses like this, a comma is normally used. So the comma here is standard punctuation.

Yes, Polish word order is fairly flexible, because case endings show grammatical roles.

For example, you could change emphasis by reordering parts of the sentence. But the original version is natural and neutral:

• Quiz pubowy sprawdza wiedzę ogólną, a uczestnik musi uzasadnić odpowiedź.

That order clearly presents:

1. what the quiz does, and
2. what the participant must do.

So while other orders are possible, this one is the most straightforward for a general statement.