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Though the drift velocity of electron re...

Though the drift velocity of electron responsible for current in a conductor under ordinary circumstances is very small, light in a room turn on immediately after the switch is closed. Explain why and how?

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Glowing of the bulb is related to setting up of E field inside the conductor which starts the closed loop current inside the conductor by making the electrons drift in one direction . It is not that when the individual electron form the switch will reach the bulb , then only it will glow ! Rather the moment the circulation of electrons starts ( with a speed of light `= 3 xx 10^(8) m//s`). the bulb glows.
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