Answer: C - The work output of the machine is equal to its work input.
A machine is said to be ideal when the work output of the machine is equal to its work input.
Solution:
A machine is said to be ideal when the work output of the machine is equal to its work input. Hence, the efficiency of an ideal machine is 100% (i.e., there is no wastage of work done on the machine). An ideal machine is also called a perfect machine.
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