What's on your mind?

by raj
(new delhi,india)

I want to know which of the following sentences are grammatically correct?

1.What's on your mind?
2.What's in your mind?
3.What's going on in your mind?

Please help me know the answer.

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Looking at the sentences above number 1 is by far the best sentence. The expression you are looking for is exactly that...What's on your mind? We ask this when we would like to know what people are thinking about (especially when they seem worried).

You could also say, What's going on in that head of yours? but this is generally used in a situation when someone does something careless or stupid.

Imagine that someone drives home very drunk...you could say, What's going on in that head of yours?