Solved papers for JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

done JEE Main Paper (Held On 19 May 2012) Total Questions - 2

• question_answer1) This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement 1: An inventor claims to have constructed an engine that has an efficiency of 30% when operated between the boiling and freezing points of water. This is not possible. Statement 2: The efficiency of a real engine is always less than the efficiency of a Carnot engine operating between the same two temperatures.     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  Statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation of Statement 1.
  done clear
  B)
                         Statement 1 is true. Statement 2 is false.
  done clear
  C)
                         Statement 1 is false, Statement 2 is true.
  done clear
  D)
                         Statement 1 is  true. Statement 2 is true, Statement 2 is the correct explanation of Statement 1.
  done clear
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• question_answer2) The pressure of an ideal gas varies with volume as \[P=\alpha V,\] where a is a constant. One mole of the gas is allowed to undergo expansion such that its volume becomes 'm times its initial volume. The work done by the gas in the process is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[\frac{\alpha V}{2}\left( {{m}^{2}}-1 \right)\]                   
  done clear
  B)
                         \[\frac{{{\alpha }^{2}}{{V}^{2}}}{2}\left( {{m}^{2}}-1 \right)\]
  done clear
  C)
                         \[\frac{\alpha }{2}\left( {{m}^{2}}-1 \right)\]                      
  done clear
  D)
                         \[\frac{\alpha {{V}^{2}}}{2}\left( {{m}^{2}}-1 \right)\]
  done clear
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