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12th Class Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Assertion And Reason (MCQs) - Current Electricity

  • question_answer
    Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: Assertion (A): The electric bulbs glows immediately when switch is on.                                            Reason (R): The drift velocity of electrons in a metallic wire is very high.

    A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)        

    B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)

    C) Assertion (A) is true but Reason (R) is false             

    D) Assertion (A) is false and Reason (R) is also false

    Correct Answer: C

    Solution :

    (c) In a conductor there are large number of free electrons. When we close the circuit, the electric field is established instantly with the speed of electromagnetic wave which cause electron drift at every portion of the circuit. Due to which the current is set up in the entire circuit instantly. The current which is set up does not wait for the electrons flow from one end of the conductor to the another end It is due to this reason, the electric bulb glows immediately when switch is on.


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