Physics-
General
Easy

Question

The p-V diagram of a gas undergoing a cyclic process (ABCDA) is shown in the graph where p is in units of N m to the power of negative 2 end exponent and V in c m to the power of 3 end exponent. Identify the incorrect statement.

  1. 0.4 J work is done by the gas from A to B    
  2. 0.2 J of work is done on the gas from C and D    
  3. No work is done by the gas from B to C    
  4. Work is done by the gas in going from B to C and on the gas from D to A    

The correct answer is: Work is done by the gas in going from B to C and on the gas from D to A


    The area under p-V diagram =work done
    or W equals A D cross times D C
    =open parentheses 2 cross times 10 to the power of 5 end exponent minus 1 cross times 10 to the power of 5 end exponent close parentheses N m to the power of negative 2 end exponent cross times left parenthesis 4 minus 2 right parenthesis cross times 10 to the power of negative 6 end exponent m to the power of 3 end exponent
    equals 1 cross times 10 to the power of 5 end exponent cross times 2 cross times 10 to the power of negative 6 end exponent J equals 0.2 blank J

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