Study the circuits given here.

Which of the following are correct statements about the bulbs in the circuits shown above if all the bulbs and cells are identical ?
I. Bulb R is the brightest.
II. Initially, all the bulbs will have the same brightness.
III. All the bulbs will light up for the same period of time.
IV. Bulb P will light up for a longer period of time than bulb Q and bulb R.

Options

A. I and III
B. II and III
C. I and IV
D. II and IV

Answer

D

Explanation

Maximum number of batteries are connected to bulb P, so it will glow for the longest period. As identical cells are connected in parallel to bulbs, so all the bulbs will glow with equal brightness.