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9th Class Mathematics Surface Areas and Volumes Question Bank Surface Area and Volume

  • question_answer
    A rectangular water tank is\[\mathbf{160m}\times \mathbf{20m}\]. Water flows at the opening at a speed of 10 km/hr. The water level will rise in the tank in half an hour by

    A)  \[\frac{3}{2}\]cm.                      

    B)  \[\frac{4}{9}\]cm,

    C)  \[\frac{5}{9}\]cm.                                

    D)  \[\frac{5}{8}\]cm.

    Correct Answer: D

    Solution :

    (d): Volume of water filled by pipe in 30 minutes \[=\left( \frac{40\times 1000000}{2} \right)\] cu. cm. =20000000 cu.cm \[\therefore \] Height of water level\[=\frac{20000000}{8000\times 4000}=\frac{5}{8}\]cm.


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