Find the odd item from the following alternatives, where most items are direct sources of light.

Introduction / Context:
This question belongs to basic general aptitude and tests whether you can classify objects according to their primary function. Here the key idea is to separate direct sources of light from supporting devices that do not themselves emit light.

Given Data / Assumptions:

• Items: Torch, Battery, Candle, Lamp.
• Three items are direct light sources used for illumination.
• One item is mainly a power source or accessory, not a light source by itself.

Concept / Approach:
We think about how each object is used in daily life. A direct light source is something that gives light on its own when activated. A supporting object helps other devices to work but does not emit light independently. By classifying each option, the odd one becomes clear.

Step-by-Step Solution:
A torch produces light when switched on and is used directly for illumination. A candle burns and gives light, so it is itself a light source. A lamp, whether electric or oil based, is designed to emit light. A battery, however, stores electrical energy and supplies power to devices like torches or lamps but does not glow or give light on its own. Therefore, battery is functionally different from the other three options.

Verification / Alternative check:
You can imagine a dark room and ask which objects, if present alone, could light up the room. A torch, a candle, or a lamp can do so independently. A battery by itself, without any connected light producing device, cannot. This simple thought experiment confirms that a battery is not a direct source of light.

Why Other Options Are Wrong:

• Torch: Directly used for lighting and clearly similar to a lamp.
• Candle: Independently emits light and heat, so it matches the idea of a light source.
• Lamp: Designed specifically to illuminate an area and fits with torch and candle.

Common Pitfalls:
Some learners may think in terms of modern or traditional devices and get distracted by design differences. The real classification is based on whether the item itself emits light or only supplies energy. Keeping focus on the core function avoids confusion and leads straight to the correct odd item.

Final Answer:
Battery