Firstly, neither questions will come up in an exam. Especially the first one. The first question is really absurd and I honestly don't know where to start with it. The second question is again not a great question, where have you got these from?
But for the 2nd one you might say that a zero defects policy is critical to the success of a JIT approach because there generally isn't a backup of resources incase a supply is faulty. For every defect in a JIT approach, it is costing the organisation more so than it would in an 'orthodox' or more common approach. For example if Qantas' engineering department uses a JIT approach to replace parts of an aeroplane, if the part received is faulty or is attached wrongly and therefore hampering the quality of the supply, it means that a new one must be ordered and employees may have nothing to do. It sets operations back further and costs such as employees are wasted and flights may be delayed.
Although a zero defects policy is desirable in many types of organisations, the consequences are much more severe in a JIT approach. If a non-JIT approach had a defect, for example on a toy production line, they could throw the toy away and still have an adequate shipment or flow of goods.
Hope I have answered the question to some degree of satisfaction. But as I said, both questions are pretty silly and I would't expect them to appear on any exam.
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