Which switches need to be closed to light the 300 W lamp?

To determine which switches need to be closed to light a 300 W lamp, it's essential to understand the circuit configuration involving those switches. In a typical scenario involving multiple switches and a lamp, the lamp will only light up when the appropriate path is established for current to flow through it.

The correct choice indicates the combination of switches that creates a closed circuit, allowing current to the lamp. If switches X and Z, when closed, complete a path that includes the 300 W lamp, it means that the electrical circuit is set up correctly to deliver the necessary power. This implies that closing switches X and Z permits current to reach the lamp, thus lighting it up as intended.

In circuits, the relevance of each switch depends on how they connect to the lamp and whether they are in series or parallel with other components. If closing switches X and Z connects directly to the lamp without creating an alternative path or an open circuit elsewhere in the configuration, the lamp will illuminate effectively.

The details of the other combinations involving switches W and Y or any mix that does not include the critical switch pairing leading to a closed path would mean that current either does not reach the lamp or is obstructed in some way. Hence, the pair providing the necessary circuit closure to