When the bulb is turned on, Ohm's law is applicable:

Explanation

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, assuming the resistance remains constant. When a bulb is turned on, its resistance is not constant; it increases as the filament heats up. This change in resistance means that Ohm's Law does not apply under these conditions, making 'No' the correct answer. The options 'Yes' and 'Partly' are incorrect because they either ignore the condition of constant resistance or misunderstand the nature of scientific laws. Option D is incorrect because it contradicts the existence of a correct option, which is B.