New PMP Question & Answers with explanation

Jack is the project manager of a project that is halfway through its execution. He is currently looking at the work schedule. He adjusts a few of the schedule milestones and imposes date constraints for some of the work packages. This relates to which of the following processes?
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Mandatory dependencies are those that are inherent in the nature of the work being done. They often involve physical limitations, such as on a construction project when it is impossible to erect the superstructure until the foundation is built. According to the PMBOK, a mandatory dependency is also:
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A manager asked to see a list of milestones in the project. This would be available as an output from the:
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A construction project requires that government environmental hearings be held prior to site preparation. What kind of dependency is this?
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To control the schedule, a project manager is reanalyzing the project to predict project duration. This is done by analyzing the sequence of activities with the least amount of flexibility. What technique is being used?
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