Solved papers for JEE Main & Advanced JEE Main Paper (Held On 11 April 2015)

done JEE Main Paper (Held On 11 April 2015) Total Questions - 2

• question_answer1) A cylindrical block of wood (density \[=650\,kg\,{{m}^{-3}}\]), of base area \[30\text{ }c{{m}^{2}}\]and height 54 cm, floats in a liquid of density \[900\text{ }kg{{m}^{-}}^{3}.\]The block is depressed slightly and then released. The time period of the resulting oscillations of the block would be equal to that of a simple pendulum of length (nearly) : [JEE Main Online Paper (Held On 11 April 2015)]  
  A)
   65 cm
  done clear
  B)
   52 cm
  done clear
  C)
   39 cm
  done clear
  D)
   26 cm
  done clear
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• question_answer2) A pendulum with time period of 1s is losing energy due to damping. At certain time its energy is 45 J. If after completing 15 oscillations, its energy has become 15 J, its damping constant (in\[{{s}^{-1}}\]) is : [JEE Main Online Paper (Held On 11 April 2015)]  
  A)
  \[\frac{1}{30}\ln 3\]
  done clear
  B)
  \[\frac{1}{15}\ln 3\]
  done clear
  C)
   2
  done clear
  D)
  \[\frac{1}{2}\]
  done clear
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