I am going to play cricket.

Question

I am not going to play cricket.
Are you going to play cricket?
Yes, I am./ No, I'm not.

1. What are you going to play?
I'm going to play cricket.

2. What are you going to do?
I'm going to play cricket.
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All the sentences are correct, aren't they?
By the way, which question is suitable for the answer? #1 or #2?

Answer 1

All of the sentences are correct. :-)

Both questions are suitable for the answer.

Number 1 assumes that you're going to play a sport. Number 2 is asking what you plan to do (go to the movies, study, play cricket, etc.).

Answer 2

GLAD TO SEE MRS SUE HERE ESPECIALLY ABOUT HEARING HER PASSING AWAY ;(