Solved papers for JEE Main & Advanced JEE Main Paper (Held On 11 April 2014)

done JEE Main Paper (Held On 11 April 2014) Total Questions - 2

• question_answer1) During an adiabatic compression, 830 J of work is done on 2 moles of a diatomic ideal gas to reduce its volume by 50%. The change in its temperature is nearly: \[(R=8.3J{{K}^{-1}}mo{{l}^{-1}})\]   [JEE Main Online Paper ( Held On 11 Apirl  2014 )
  A)
  40 K                       
  done clear
  B)
  33 K
  done clear
  C)
  20 K
  done clear
  D)
  done clear
  E)
  14 K
  done clear
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• question_answer2) An ideal monoatomic gas is confined in a cylinder by a spring loaded piston of cross section \[8.0\times {{10}^{-3}}{{m}^{2}}.\]Initially the gas is at 300 K and occupies a volume of \[2.4\times {{10}^{-3}}{{m}^{3}}\] and the spring is in its relaxed state as shown in figure. The gas is heated by a small heater until the piston moves out slowly by 0.1 m. The force constant of the spring is 8000 N/m and the atmospheric pressure is \[1.0\times {{10}^{5}}N/{{m}^{2}}.\] The cylinder and the piston are thermally insulated. The piston and the spring are massless and there is no friction between the piston and the cylinder. The final temperature of the gas will be: (Neglect the heat loss through the lead wires of the heater. The heat capacity of the heater coil is also negligible).   [JEE Main Online Paper ( Held On 11 Apirl  2014 )
  A)
  300 K                    
  done clear
  B)
  800 K
  done clear
  C)
  500 K                    
  done clear
  D)
  1000 K
  done clear
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