सीट कहाँ है? खिड़की के पास है।

Hindi usually does not move question words to the front the way English does.

A very natural Hindi pattern is:

• [thing] + [question word] + [verb]

So:

• सीट कहाँ है?
• literally: seat where is?

This is normal Hindi word order. The answer fits into the same slot:

• खिड़की के पास है।

So you can think of कहाँ as sitting where the location answer goes.

के पास is a very common Hindi expression meaning:

• near
• by
• next to

So खिड़की के पास means near the window or by the window.

It is best to learn के पास as a chunk.

Also, in other contexts, X के पास can mean with X / in X’s possession:

• मेरे पास किताब है। = I have a book.

But in your sentence, it is clearly the location meaning: near the window.

In this expression, के पास works as a fixed postpositional phrase. So learners should usually memorize it as:

• noun + के पास

That is why you say:

• खिड़की के पास
• मेज़ के पास
• दरवाज़े के पास

Even though खिड़की is feminine, you still use के पास in this location expression.

So the simplest rule for learners is: treat के पास as one unit meaning near/by.

Because Hindi often leaves out pronouns when they are already understood from context.

In English, you usually need:

• It is near the window.

In Hindi, once सीट has already been mentioned, you can simply say:

• खिड़की के पास है।

The subject is understood from the previous sentence. This is very natural Hindi.

If you want the full version, you can say:

• सीट खिड़की के पास है।

But the shorter answer sounds very normal in conversation.

Yes. That is the full sentence:

• सीट खिड़की के पास है। = The seat is near the window.

Compared with the shorter answer:

• खिड़की के पास है।

the full version repeats सीट, while the shorter version leaves it understood.

Both are correct. The shorter one is especially natural when answering a question that already mentioned the seat.

It is grammatical, but the emphasis is a little different.

• सीट खिड़की के पास है। = The seat is near the window.
• खिड़की के पास सीट है। = There is a seat near the window.

So the second one sounds more like you are presenting the existence of a seat in that location, rather than simply answering where the seat is.

For the question सीट कहाँ है?, the most natural answers are:

• खिड़की के पास है।
• सीट खिड़की के पास है।

सीट is a very common English loanword in Hindi. Hindi speakers use many everyday borrowed words, and सीट is one of them.

It is commonly treated as feminine:

• नई सीट = new seat

In your sentence, you cannot see the gender clearly, because है stays the same for singular masculine and feminine.

So even though the sentence does not show it directly, a learner will often hear सीट used as a feminine noun.

Hindi does not have articles like English a/an/the.

So:

• सीट can mean a seat or the seat
• खिड़की can mean a window or the window

The exact meaning depends on context.

In this example, context makes it clear which seat and which window are being talked about, so Hindi does not need separate article words.

No. कहाँ by itself is completely natural.

So:

• सीट कहाँ है? is perfectly good Hindi.

You may also hear:

• सीट कहाँ पर है?

That is also correct, but पर is not required here. It can sound a little more explicit or slightly heavier, while plain कहाँ is very common in everyday speech.

A simple guide:

• कहाँ = kahā̃
• खिड़की = khiṛkī

A few pronunciation notes:

• ख is an aspirated k sound: say k with a puff of air.
• The final vowel in कहाँ is nasalized, shown by ँ.
• ड़ in खिड़की is a quick flap sound. For many English speakers, it can feel a bit like the quick tt/dd sound in American butter, but with the tongue curled back slightly.

So a rough English-speaker approximation would be:

• कहाँ ≈ kuh-haa(nasal)
• खिड़की ≈ khi-rki / khiṛ-kee

Not perfect, but close enough for a beginner.