多大 or 多少？
Could these two terms be used interchangeably, and if not what is the difference between them? When should they be used?
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多大 is about the size (how big, how old)
多少 is about the quantity (how many, how much)
In (1), the question is asked from the point of view of the accumulation.
In (2), it is asked from the point of view of the precise number solely.
Could these two terms be used interchangeably? No, because even if they do are used in the same linguistic context, the meaning of the sentences won't be the same.
In (3), it is about the importance of the help (thus it is more subjective).
In (4), it is solely about the number (from an already expected amount).