The 'Question' category contains the following settings:
Check the option 'Set max time for questions' to specify that the user must answer the question within a certain time period
Set the time in seconds for the user the answer in the setting 'Skip question after period (s)'. If the user hasn’t answered within the specified time, the answer will be regarded as wrong.
Check the option 'allow to go back' to set whether the user can go back to the previous question. Disabling this option will also disable the back-button in the survey.