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A ideal monoatomic gas is carried around the cycle ABCDA as shown in the fig. The efficiency of the gas cycle is

  1. fraction numerator 4 over denominator 21 end fraction    
  2. fraction numerator 2 over denominator 21 end fraction    
  3. fraction numerator 4 over denominator 31 end fraction    
  4. fraction numerator 2 over denominator 31 end fraction    

The correct answer is: fraction numerator 4 over denominator 21 end fraction

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3 rightwards arrow 1 blankis

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