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  5. Force and Pressure

8th Class Science Force and Pressure Question Bank Force and Pressure Formative Objective Problems

  • question_answer
    The given figure shows three plastic bottles interconnected through two pipes. Water is filled in each bottle to the same height. Bottle I is then closed in such a manner that no air is able to enter it.
    If a stone is dropped in bottle III, then the water level will increase in

    A)  bottle III only

    B)  both bottles I and II

    C)  both bottles II and III

    D)  bottles I, II, and III equally

    Correct Answer: C

    Solution :

      Water exerts equal pressure at equal height. If a stone is dropped in bottle III, then the volume of the stone will cause an increase in the water levels in bottles II and III. Some water will pass from bottle III to bottle II. As a result, the water levels in bottles II and III will increase. The water level in bottle I will remain as before. Since bottle I is closed in an air tight manner, there is no opening for the air inside bottle I to escape. As a result, there will be no free space available in bottle I for extra water to pass from bottle II to bottle I. The correct answer is C.


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