I am looking for a questionnaire or other tools to use it for determining the types of play in children (classified by Piaget), is there anything that can help me with that?
Let me start by saying that I am considered a world while expert in Jean Piaget's monumental theory of cognitive development and have some published papers on that theory, as you can see in my RG profile.
I do not know of any questionnaire for determining types of play in 7-year-old children and even think that it would not be possible to determine types of play in 7-year-old children through a questionnaire.
In order to attain such goal you have to observe via a naturalistic observation at home and/or school how children of this age play. To play with whom: children of their age, younger than or older than them?
Before performing such an observation, I would urge you to read the following two books by Jean Piaget:
1. Piaget, J. (1932). The moral judgement of the child. London: Routledge & Kegan Paul. (Original published in French in 1932)
2. Piaget, J. (1962). Play, dreams and imitation in childhood . London: Routledge & Kegan Paul. (Original published in French in 1945).