Question

The room is being cleaned.


voice change

Answer 1

Answer:

there is no change in voice it remains the same

Explanation:

Answer 2

Answer:

I am cleaning the room.

or

Someone is cleaning the room. [ better here as no object in question ]

Explanation:

In the question, your confusion must have been the absence of the 'by' part. But it is understood that I or someone will be the subject here, but it also depends with the context of the question.

Hope it helps!