New PMP Question & Answers with explanation

A project manager has just started planning his project. If he has only limited information about the project, he should use the following technique to estimate the duration for each activity using historical data from a similar project:
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You are working as a project manager for a high-yield crop development project. Data from the weather agency shows an unfavorable weather pattern for the next few months. As a senior project manager, you want to assess the schedule’s feasibility under adverse conditions and provide some insights to your team. That way, your team can prepare some reserves and plan risk responses if unfavorable conditions exist during execution. Which of the following techniques should you use to simulate risks and other sources of uncertainty to calculate possible schedule outcomes?
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You are managing a heavy equipment manufacturing project that involves many mechanical, electrical, and IT staff. Your team prepared a schedule network diagram using duration estimates with dependencies and constraints. Your team also calculated the critical path for the project using late and early values. Today, your project office has indicated to you that some of the resources you had planned for the project will be unavailable. To deal with this, you explore the possibility of modifying the schedule to account for limited resources. What is your best possible step in such a situation?
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All the following are tools of the Control Schedule process except:
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Mary is a project manager for an infrastructure upgrade project in a government agency. She realized recently that a critical scheduled task exceeded its deadline, and the stakeholders are aware of it. The resource manager has permitted Mary to use three more resources to work on and complete the delayed task. Although the three additional resources prove helpful, Mary is still concerned about the task because:
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