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9th Class Science Matter in Our Surroundings Question Bank Matter in Our Surroundings

  • question_answer
    Ritwik was given four inflammable substances P, 0, R and S. He was asked to handover them to Ramesh who was the resident of a hot area (temperature, \[46{}^\circ C\]). Ritwik collected the data about the substances as shown in the table. Which substances Ritwik should not carry to the hot area where Ramesh lives?
    Substance Ignition Temperature
    P 40°C
    Q 38°C
    R 52°C
    S 59°C
     

    A) P and Q                      

    B) R and S           

    C) P and S           

    D) P, Q and S

    Correct Answer: A

    Solution :

    Ritwik should not carry the substances P and Q to the hot area where temperature is \[\text{46 }\!\!{}^\circ\!\!\text{ C}\] as these substances have the ignition temperatures lower than \[\text{46 }\!\!{}^\circ\!\!\text{ C}\] hence, these will catch fire immediately.


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