Current Electricity Questions

Six similar bulbs are connected as shown in the figure with a DC source of emf $E$ and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

Which of the following acts as a circuit protects device?

In the circuits shown below, the readings of voltmeters and the ammeters will be:

The metre bridge shown is in a balanced position with $\frac{P}{Q}=\frac{l_1}{l_2}$. If we now interchange the position of the galvanometer and the cell, will the bridge work? If yes, what will be the balanced condition?

The reading of an ideal voltmeter in the circuit shown is: