2. Questions Bank
  3. 8th Class
  4. Science
  5. Combustion and Flame

8th Class Science Combustion and Flame Question Bank Combustion and Flame HOTS Objective Problems

  • question_answer
    A certain gas is used by living organisms for respiration, and this is used in the process of combustion. In the process of combustion, the gas reacts with combustible substances to produce heat. The mentioned gas is

    A)  Oxygen                              

    B)  Nitrogen

    C)  Carbon dioxide               

    D)  Carbon monoxide

    Correct Answer: A

    Solution :

      Oxygen gas is used by human beings and other living organisms for respiration. Combustion is a chemical process in which a combustible substance reacts with oxygen. Heat and sometimes light energy is released during combustion. Hence, the gas mentioned is oxygen. The correct answer is A.


You need to login to perform this action.
You will be redirected in 3 sec spinner