Efficiency of an ideal machine is:
AMore than 100 percent
B50 percent
C0 percent
D100 percent
Answer & Solution
Correct answer: D. 100 percent
1. Ideal machines have no friction or weight of parts.
2. All input work becomes useful output.
3. So efficiency equals 100 percent for an ideal machine.
4. Real machines have efficiency below 100 percent.
_Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_
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