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Shraddha GangurdeShraddha Gangurde 

How to enable question object in your Org..??

Khan AnasKhan Anas (Salesforce Developers) 
Hi Shraddha,

Greetings to you!

To enable Chatter Questions in your organization, add the Question action to the global publisher layout. If your organization was created after Summer ‘14, the Question action is automatically added. Nonetheless, we recommend that you drag it to the far left of the layout to increase its visibility. If you’re using a customized publisher layout in groups or on records, make sure that the Question action is added to those layouts as well.

Chatter Desktop doesn’t support Chatter Questions.

Reference: https://help.salesforce.com/articleView?id=collab_chatter_questions_overview.htm&type=5

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Thanks and Regards,
Khan Anas
Raj VakatiRaj Vakati
Refer this link  

Salesforce support needed to turn on 

https://help.salesforce.com/articleView?id=collab_chatter_questions_overview.htm&type=5