Solved papers for JEE Main & Advanced JEE Main Paper (Held On 10 April 2015)

done JEE Main Paper (Held On 10 April 2015) Total Questions - 2

• question_answer1) If the capacitance of a Nano capacitor is measured in tern-is of a unit V made by combining the electronic charge 'e', Bohr radius \['{{a}_{0}}',\] Planck's constant 'h' and speed of light 'c' then : JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[u=\frac{hc}{{{e}^{2}}{{a}_{0}}}\]                          
  done clear
  B)
  \[u=\frac{{{e}^{2}}h}{c{{a}_{0}}}\]
  done clear
  C)
  \[u=\frac{{{e}^{2}}{{a}_{0}}}{hc}\]                          
  done clear
  D)
  \[u=\frac{{{e}^{2}}c}{h{{a}_{0}}}\]
  done clear
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• question_answer2) Diameter of a steel ball is measured using a Vernier callipers which lias divisions of cm on its main scale (MS) and 10 divisions of its vernier scale (VS) match 9 divisions on the main scale. Three such measurements for a ball are given as :

  S. No.	MS (cm)	VS divisions
  1.	0.5	8
  2.	0.5	4
  3.	0.5	6

  If the zero error is - 0.03 cm, then mean corrected diameter is : JEE Main Online Paper (Held On 10 April 2015)
  A)
   0.56 cm
  done clear
  B)
   0.53 cm
  done clear
  C)
    0.52 cm
  done clear
  D)
   0.59 cm
  done clear
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