For a given heat engine, I. efficiency can be 1 . II. mechanism of conversion of heat into work ...

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For a given heat engine,
I. efficiency can be 1 .
II. mechanism of conversion of heat into work can be done by heating the system (say a gas or a mixture of gases) by an external furnace, as in a steam engine.
Choose the incorrect statement.
(a) Only I
(b) Only II
(c) Neither I nor II
(d) Both I and II
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