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Home Aptitude Volume and Surface Area See What Others Are Saying!
  • Question
  • A single pipe of diameter x has to be replaced by six pipes of diameters 12 cm each. The pipes are used to covey some liquid in a laboratory. If the speed/flow of the liquid is maintained the same then the value of x is ?


  • Options
  • A. 14.69 cm
  • B. 29.39 cm
  • C. 18.65 cm
  • D. 22.21 cm

  • Correct Answer
  • 29.39 cm 

    Explanation

    Volume of water flowing through 1 pipe of diameter x = Volume discharged by 6 pipes of diameter 12 cms.

     

    As speed is same, area of cross sections should be same. 

     

    Area of bigger pipe of diameter x = Total area of 6 smaller pipes of diameter 12 

    i.e  ?R 2   =   6 ?R 1 2    

    Here R = R and R1 = 12/2 = 6   

    ? R 2   =   6 × 6 × 6    

    R = 14.696   

    => D = X = 14.696 * 2 = 29.3938 cm.

  • Tags: GRE, GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk

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    • Options
    • A. 5
    • B. 6
    • C. 7
    • D. 10
    • Discuss
    • 2. 
      A wheel makes 1000 revolutions in covering a distance of 88 km. the diameter of the wheel is?

    • Options
    • A. 24 meters
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    • C. 28 meters
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    • 3. 25, 36, 49, 81, 121, 169, 225

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    • 4. 
      (.896 x .752 +.896 x .248) / (.7 x .034 + .7 x.966) =?

    • Options
    • A. 1.28
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    • 5. 
      Einstein goes from Ahmedabad To Lucknow at the speed of 40 km/hr and returned at the speed of 60 km/hr .the average speed of Einstein during the whole journey is

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    • A. 48 km/hr
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    • 6. 
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    • 7. 9548 + 7314 = 8362 + (?)

    • Options
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    • 8. 
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    • A. ? 400
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    • 9. 
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