Koja je ovo vrsta karte?

A word-by-word breakdown:

• Koja = which / what kind of
• je = is
• ovo = this
• vrsta = type / kind
• karte = of ticket / of card / of map, depending on context

So the structure is literally something like Which is this type of ticket/card/map?, but in natural English it comes out as What kind of ticket/card/map is this?

Because koja agrees with vrsta.

• vrsta is a feminine singular noun
• so the matching form is koja

Compare:

• koji = masculine singular
• koja = feminine singular
• koje = neuter singular

So koja vrsta means which/what kind because vrsta is feminine.

Because je is a clitic in Serbian. Clitics usually go in the second position of the sentence or clause.

Here, Koja comes first, so je goes right after it:

• Koja je ovo vrsta karte?

This is very normal Serbian word order. English speakers often want to place je more freely, but Serbian clitics follow stricter placement rules.

This is a very common question.

Here, ovo does not directly modify vrsta. It refers more generally to this thing here — the thing you are pointing at or asking about.

So:

• ova vrsta = this type
• ovo = this (thing)

That is why Serbian can say:

• Koja je ovo vrsta karte?

If you were directly saying this type of ticket, then you would use feminine agreement:

• ova vrsta karte

So the difference is:

• ova vrsta karte = this type of ticket
• Koja je ovo vrsta karte? = What kind of ticket is this?

Karte is in the genitive singular.

The noun vrsta often takes another noun in the genitive, just like English type of...:

• vrsta karte = type of ticket/card/map
• vrsta pića = type of drink
• vrsta muzike = type of music

So:

• vrsta = type
• karte = of ticket/card/map

This is a very standard Serbian pattern.

Here it is singular: genitive singular of karta.

That can be confusing because karte is also the nominative plural form in other contexts.

Here is the difference:

• karta = one ticket/card/map
• karte = nominative plural, tickets/cards/maps
• karte = genitive singular, of a ticket/card/map

In vrsta karte, the meaning is singular: a type of ticket/card/map.

If you wanted types of tickets/cards/maps, you would typically get:

• vrste karata

No. Karta can mean several things, depending on context, including:

• ticket
• card
• map

So vrsta karte could mean:

• type of ticket
• type of card
• type of map

Only the situation tells you which meaning is intended.

Yes, often you can, but the nuance changes a little.

• Koja je ovo vrsta karte? = What kind/type of ticket is this?
  This explicitly asks about the category/type.

• Kakva je ovo karta? = What kind of ticket/card is this?
  This is often more natural in everyday speech when you are asking about its nature or characteristics.

Also compare:

• Koja je ovo karta? = usually Which card/ticket is this?
  This sounds more like identifying a specific item, not asking about its type.

So koja vrsta is more explicit and a bit more formal, while kakva is often more conversational.

The sentence is correct and understandable, but it can sound a bit more explicit or formal because of vrsta.

In everyday speech, many people would often say:

• Kakva je ovo karta?

That sounds more natural if you simply want to know what sort of ticket/card/map something is.

But Koja je ovo vrsta karte? is still perfectly valid, especially when you want to emphasize type/category.

To some extent, yes, but the given order is the most neutral here.

• Koja je ovo vrsta karte? = normal, natural question

What should usually stay true:

• the question word koja naturally comes first
• the clitic je stays in second position

So you should think of the given sentence as the safest standard pattern.

If you move words around too much, the sentence may sound marked, less natural, or like an echo question rather than a normal information question.