Hi,
Information about how many items are on exam, item types, etc. is not disclosed by Microsoft and is covered under non-disclosure agreements when someone takes a Microsoft exam.
You can take a look at this post by one of the moderators of this forum. Jeff talks about all of the various question types that may be in use:
http://social.msdn.microsoft.com/Forums/en-US/CertGeneral/thread/47aedf10-ea1b-4628-a116-263760e4db50
Also, please take a look at the official Microsoft Learning page for this exam. It will give you details about the topics that may be covered on the exam and preparation materials.
http://www.microsoft.com/learning/en/us/Exam.aspx?ID=70-461
Mike Corkery, MCT, MVP (Office Systems), MCSD (Windows Store Apps), MCITP, MCPD, MSF, etc. Please do not forget to click “Vote as Helpful” if any post helps you and "Mark as Answer”if it solves the issue.