2. Questions Bank
  3. 7th Class
  4. Science
  5. Physical and Chemical Changes

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

  • question_answer
    Sagging of electric wires in summers is because of:

    A) Contraction of metals on heating.

    B) Expansion of metals on heating.

    C) Metals remain same on heating.

    D) Metals change their colour on heating.

    E) None of these

    Correct Answer: B

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