おっしゃっている「なんか」は英語に訳すとsomething がいいと思います。
物音がする,雑音が聞こえたときなどはnoise を使って、I can hear a noise from the kitchen. キッチンから物音がするという表現もできます。
hear=聞こえる
noise=物音、異音
from=~から
kitchen=キッチン
少しでも参考になれば幸いです。
When you can hear something from somewhere, for example, when you hear a sound from the kitchen, you can explain that by using one of the above suggestions. You may of course also use appropriate body language.
"I just heard a noise.", can be used to say that you heard something in the immediate past. By using the word, "just", you are expressing that only a moments or a few moments ago, you heard a noise. The verb, "heard", is in the past tense. As a result, you should use this sentence when referring to the past.
"I can hear a noise.", also expresses that there was a noise, but it uses the present tense verb, "hear", to say that the noise is happening in the present moment. "Can", shows that you hear the noise because you have the ability to hear it.
"What was that? I heard a noise.", can be used to refer to the past because of the past tense verb, "heard". A question can also be asked before the sentence to ask someone if he/she knows what the noise was. This question and sentence can be said at any time to refer to a noise that occurred at some point in the past.
"I just heard a noise."（音が聞こえた。）は、ちょうど何か聞こえたことを言いたいときに使うことができます。 "just"を使うことで、ちょっと前に音が聞こえたというニュアンスが伝わります。動詞"heard"は、過去形で、聞こえたという意味です。過去のことを話しているのでこれを使います。
"I can hear a noise."（音が聞こえる）も、音が聞こえることを伝えていますが、現在形の動詞"hear"（聞こえる）を使っています。その音が今もしていることを表します。"Can"は、聞こえる、～できるということを意味します。
"What was that? I heard a noise."（何だった？音が聞こえた。）は、過去形"heard"を使っています。相手に音が聞こえたかどうか聞くことができます。質問と音が聞こえたという文は、さかのぼって音が聞こえたどこかで言うことができます。
What's that noise?
何の音？
何か聞こえた時にとっさに出る言葉としてこんな言い方はいかがでしょう？
I can hear something from the kitchen.
台所からなんか音がするんだけど。
Can you hear it too?
あなたも聞こえる？
と聞いておきながら相手が聞こえないと言ったらちょっと怖いですけどね…
"I can hear something" and "Can you hear that?"
These are the expressions used when you can hear something or think you can hear something in the distance and you are asking someone you are with if they can hear it too or you are letting them know that you can hear something.
"I can hear something"（何か聞こえる）と "Can you hear that?"（聞こえましたか）
これらの表現は、何か音が聞こえた、あるいは聞こえたような気がしたときに、相手にそれを伝えたり、「あなたも聞こえましたか」と確認する場合に使われます。
You may say, I thought I heard something from the kitchen, did you hear that?
If it sounded like something is breaking in the kitchen, you may say I heard something breaking in the kitchen. What's that noise from the kitchen? I heard some noise from the Kitchen. I heard some noise, I think it's coming from the kitchen. I heard a noise from the kitchen. There's a loud noise coming from the kitchen. You may use the most that applies to your situation.
I thought I heard something from the kitchen, did you hear that?（何かキッチンから音がしたような。あなたは聞こえた？）
何かが割れたような音だったなら、次のように言えます。
I heard something breaking in the kitchen.（キッチンで何か割れたような音がした）
What's that noise from the kitchen?（キッチンから聞こえるあの音は何ですか）
I heard some noise from the Kitchen.（キッチンから音が聞こえた）
I heard some noise, I think it's coming from the kitchen.（何か音がした、キッチンからだったと思う）
I heard a noise from the kitchen.（キッチンから音が聞こえた）
There's a loud noise coming from the kitchen.（キッチンから大きな音がする）
If you heard a noise or something coming from somewhere and want to explain this, you can simply say something like "I just heard something over there." or you can ask someone if they heard it too by saying something like "Did you hear that sound?".
どこかから物音が聞こえたときは、シンプルに次のように言えます。
"I just heard something over there."（今向こうから物音がした）
相手もそれを聞いたか確認することもできます。
"Did you hear that sound?"（今の音聞こえた？）
I can hear some sounds. Is there anyone in the kitchen?
Try to be more specific and point where you hear the sound from. Although your example is a correct one, I provided you with two more options which are more detailed.
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