New PMP Question & Answers with explanation

Making small, incremental improvements within a product or process is known as:
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Nicolas is the sponsor of a project that will replace all equipment that has already surpassed its end of lifetime span. He decides to assign this project to Carina, his topperforming project manager. Carina’s first task will be to write the project charter. Who will be responsible for signing the project charter document, thereby approving the project?
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A project manager plots the degree of certainty and complexity of a project along x- and y-axes to determine what type of project management approach would suit the project best. The exercise reveals that the project falls within the “complex” quadrant due to moderately uncertain requirements and highly uncertain technical challenges. Based on this information, what type of approach should the project manager use to manage the project?
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You are the project manager for a project that will produce a mobile phone application that sends alerts when UV rays are at dangerous levels, alerting users to stay indoors. During a team meeting, you stress the importance of documenting both explicit and tacit knowledge. What does tacit knowledge refer to?
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A project manager is working through potential options using a decision tree. Scenario A has a failure impact of –$5,000 with a probability of 25 percent, and no impact if successful; and scenario B has a failure impact of –$3,500 with a probability of 65 percent, and no impact if successful. Which scenario should the project manager choose?
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