Solved papers for JEE Main & Advanced JEE Main Online Paper (Held On 23 April 2013)

done JEE Main Online Paper (Held On 23 April 2013) Total Questions - 1

• question_answer1)                 Which of the following statement is Not correct?     [JEE Main Online Paper ( Held On 23  April 2013 )
  A)
                    Ground  wave signals are more stable than the sky wave signals.
  done clear
  B)
                                           The critical frequency of an ionospheric layer is the highest frequency that will be reflected back by the layer when it is vertically incident.
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  C)
                                           Electromagnetic waves of frequencies higher than about 30 MHz cannot penetrate the ionosphere.
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  D)
                                           Sky wave signals in the broadcast frequency range are stronger at night than in the day time.
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