11th Class Physics Motion In a Plane / समतल में गति Question Bank 11th CBSE Physics Mathematics Two Dimensional Motion, Relative Motion

  • question_answer
    What is barrier protection of metal?  

    Answer:

    The processes in which iron surface is kept away from the atmosphere.   (i) By painting the surface.   (ii) By coating the surface with thin film of oil or grease.   (iii) By electroplating iron with some non-corrosive metal such as nickel, chromium, copper.   (iv) Using layer of anti-rust solution e.g. b is phenol.  


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