Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 May 2012)

done JEE Main Paper (Held On 12 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: Bats emitting ultrasonic waves can detect the location of a prey by hearing the waves reflected from it. Statement 2: When the source and the detector are moving, the frequency of reflected waves is changed.   JEE Main Online Paper (Held On 12 May 2012)
  A)
  Statement 1 is false. Statement 2 is true.
  done clear
  B)
                         Statement 1 is true, Statement 2 is false.
  done clear
  C)
                         Statement 1 is true. Statement 2 is true, Statement 2 is not the correct explanation of Statement 1. 
  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) A wave represented by the equation \[{{y}_{1}}=a\cos (kx-\omega t)\]is superimposed with another wave to form a stationary wave such that the point x ? 0 is node. The equation for the other wave is   JEE Main Online Paper (Held On 12 May 2012)
  A)
  \[a\cos (kx-\omega t+\pi )\]      
  done clear
  B)
                         \[a\cos (kx-\omega t+\pi )\]
  done clear
  C)
                         \[a\cos \left( kx+\omega t+\frac{\pi }{2} \right)\]            
  done clear
  D)
                         \[a\cos \left( kx-\omega t+\frac{\pi }{2} \right)\]
  done clear
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