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Home Aptitude Volume and Surface Area See What Others Are Saying!
  • Question
  • A rod of 2 cm diameter and 30 cm length is converted into a wire of 3 cm length of uniform thickness. The diameter of the wire is?


  • Options
  • A. 2/10 cm
  • B. 2/?10 cm
  • C. 1/?10 cm
  • D. 1/10 cm

  • Correct Answer
  • 2/?10 cm 

    Explanation

    Given, r1 = 1 cm, h1 = 30 cm, h2 = 300 cm.
    Volume of rod = Volume of wire
    ? ?r12h1 = ?r22h2
    ? ? x (1)2 x 30 = ? x r22 x 300
    ? r22 = 30/300
    ? r2 = 1/?10 cm
    ? diameter = 2r2
    = 2 x 1/?10 = 2/?10cm.


  • More questions

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      Five coins are tossed at a time. Then, the probability of obtaining at least one tail is

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    • A. 31/32
    • B. 1/32
    • C. 1/5
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    • Discuss
    • 2. 
      Find the maximum number of tree which can plant 20 m apart on the two side of straight road 1760 m long

    • Options
    • A. 174
    • B. 176
    • C. 180
    • D. 178
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    • 3. 
      1307 x 1307 =?

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    • A. 1601249
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    • 4. 
      The circumferences of two concentric are 176 m and 132 m respectively. what is the difference between their radii?

    • Options
    • A. 5 meter
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    • D. 44 meter
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    • 5. 
      (1/2 ÷ 4 + 20) / (1/2 x 4 + 20) =?

    • Options
    • A. 81 / 88
    • B. 23/11
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    • 6. 
      Find the cardinal number of the following set {x: x = 2n, n ? N, 4 ? x ? 11}

    • Options
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    • 7. 
      If a fraction is multiplied by itself and then divided by the reciprocal of the same fraction, the result is 18 26/ 27. Find the fraction.

    • Options
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    • 8. 
      (0.04) 3 =?

    • Options
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    • 10. 
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    • Options
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