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7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Look at the following diagram and answer the given questions. Which of the following is the prevention method for the process shown in the given diagram?

    A) Painting iron door

    B) Coating of iron pipes with zinc metal

    C) Greasing of metal surface

    D) All of these

    Correct Answer: D

    Solution :

    Rusting of iron can be prevented by use of paint or grease or by coating of iron pipes with zinc metal i.e., galvanization


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