7th Class Science Winds, Storm and Cyclones Question Bank Winds Storms and Cyclones

  • question_answer
    In the figure, bottle is filled with lukewarm water and then emptied and cap was put tightly. Then cold water was poured on it. The shape of the bottle gets distorted. 
    Statement 1: Atmospheric pressure is more than air pressure inside the bottle as the air was driven out.
    Statement 2: Air exerts pressure on surfaces with which it comes in contact.         

    A)  Statement 1 is the conclusion of statement 2.

    B)  Statement 2 is the conclusion of statement 1.

    C)  Only statement 1 is correct.   

    D)  Only statement 2 is correct.   

    Correct Answer: A

    Solution :

    The steam drives out the air from the bottle. So, when the bottle is covered with cap, it only contains steam. On cooling, the steam condenses to water and creates a vacuum inside the container. The air from outside exerts more pressure than that is exerted from inside the bottle, thereby the shape of the bottle gets distorted.


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