The Salesforce Certified Platform App Developer Exam is a multiple choice question exam. The exam consists of 60 multi-choice questions to be completed in 90 minutes. The passing score for the exam is 63 percent, so roughly at least 40 questions should be answered correctly.
The exam is proctored and no reference material should be referred to while sitting the exam. You can take the exam at an exam center or as an online proctored exam.
Anyone with a good knowledge of the Salesforce.com and Force.com platforms can take the exam. Salesforce also has classroom training for the exam. More information on the classroom training can be found at http://certification.salesforce.com/app-builders.
Once you finish the exam, the result is displayed instantly on the screen. The result shows only a Pass or Fail and the Certificate is delivered to the registered e-mail. No grades or percentages are displayed in the result.