Question

What kind of arrangement of bulb is there in a holiday decorative lights times that we use on new year and other
special occasion

Answer 1

$\underline{\underline{\Huge\mathfrak{Answer}}}$

Answer is series arrangement of bulb.

When bulbs are connected in series the same quantity of current flows through each bulb.

In series arrangement, the positive terminal of the one bulb is connected to the negative terminal of the second, the positive of second to the negative of third and so on.
the positive of the first bulb and the negative of the last ball are connected to a source.
the potential difference across each bulb is equal to the sum of the e.m.fs of the source.