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Q.

Even Carnot engine cannot give 100% efficiency because we cannot :

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a

Prevent radiation

b

Find ideal sources

c

Reach absolute zero temperature for sink

d

Eliminate friction

answer is C.

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Detailed Solution

percentage efficiency of carnot engine is η=(1−T2T1)×100  where T2=temperature of cold body or temperature of sink   T1=temperature of hot body or temperature of source  to get 100% efficiency,T2 (the temperature of cold body) should be 0K  to achieve 0K is not possible hence even carnot engine cannot give 100% efficiency
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