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7th Class Science Electric Current and Its Effects Question Bank Electric Current and Its Effects

  • question_answer
    DIRECTIONS: On the basis of following diagram / picture answer the questions given below: The diagram shows an electric bell which materials would be suitable for the parts labeled P, Q and R?
    P Q R
    A soft iron brass soft iron
    B soft iron soft iron spring steel
    C soft iron brass brass
    D spring steel soft iron spring steel

    A) A                                 

    B) B

    C) C                                

    D) D

    Correct Answer: B

    Solution :

    As P is acting as an electromagnet, it should be made of a soft-magnetic material such as soft iron. Q needs to be a magnetic material, such as soft iron, and R is a permanent magnet, thus it is made of steel.


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