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9th Class Science Gravitation and Floatation Question Bank Gravitation and Pressure

  • question_answer
    A liquid exerts a pressure of \[100,999\,\,Pa\] on an object when it is \[73.5\,\,cm\] below the liquid surface. What is the density of the liquid? (Take\[g=10\,\,m{{s}^{-2}}\])

    A) \[136\,\,kg\,\,{{m}^{-3}}\]                    

    B) \[272\,\,kg\,\,{{m}^{-3}}\]

    C) \[13,700\,\,kg\,\,{{m}^{-3}}\]  

    D) \[27,200\,\,kg\,\,{{m}^{-3}}\]

    Correct Answer: C

    Solution :

    \[\rho gh=1,00,999=(\rho )(10)(0.735)\] \[\rho =1,00,999\div (10\times 0.735)\] \[=13,741\,\,kg\,\,{{m}^{-3}}\approx 13,700\,\,kg\,\,{{m}^{-3}}\]


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