8th Class Science Combustion and Flame Question Bank Combustion and Flame

  • question_answer Which of the following statements is NOT true?

    A)  Spontaneous combustion takes place without any apparent cause.

    B)                                         The luminous zone of a flame has high temperature.

    C)                         Carbon dioxide gas causes global warming.

    D)                         The calorific value of a fuel is expressed in \[kJ/k{{g}^{-1}}.\]

    Correct Answer: B

    Solution :

    St is not the luminous zone but the non- luminous zone of the flame that has a very high temperature.

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