Assertion: Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason: Resistance decreases due to decrease in temperature.

Question

Assertion: Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason: Resistance decreases due to decrease in temperature. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

The resistance of that half portion of the metallic wire (heated red hot) on which cold water is poured decreases due to fall in its temperature. This results in a decrease in the resistance of the entire wire. As a result, the current in the wire increases and the other half portion becomes hotter than before.

Q. Assertion : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason : Resistance decreases due to decrease in temperature.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Q. Assertion : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot.
Reason : Resistance decreases due to decrease in temperature.