In the following question on object classification, four items are listed (Mobile, Computer, Fountain Pen and Television). Three of these are electronic devices, while one is a non electronic writing instrument. Select the odd word from the given alternatives.

Introduction / Context:
This question belongs to the general classification segment of verbal reasoning. The words given are Mobile, Computer, Fountain Pen and Television. Three of these represent modern electronic gadgets that operate using electricity or batteries, while one is a traditional writing tool that does not require electrical power. Identifying this basic technological difference will help you select the odd one out.

Given Data / Assumptions:

• Mobile: handheld electronic communication device often called a mobile phone or smartphone.
• Computer: electronic device used for computing, processing data and running software.
• Fountain Pen: mechanical writing instrument using ink, not electricity.
• Television: electronic device used for receiving and displaying audio visual content.
• We categorise items as electronic devices versus non electronic tools.

Concept / Approach:
The concept is straightforward: check whether each item depends on electrical power to function. A mobile needs a battery and electronic circuits, a computer requires electricity, and a television needs an electrical power source. A fountain pen works entirely through mechanical flow of ink and hand movement, without any electronics or power supply. That makes the fountain pen fundamentally different from the other three devices.

Step-by-Step Solution:
Step 1: Consider Mobile.A Mobile phone is an electronic gadget that needs a battery charge or external power to operate. It is clearly an electronic device.Step 2: Consider Computer.A Computer operates using complex electronic components and must be plugged into a power source or powered by a battery. It is another electronic device.Step 3: Consider Television.A Television also needs electrical power to display images and sound. It is an electronic appliance used for entertainment and information.Step 4: Consider Fountain Pen.A Fountain Pen is a simple writing instrument that uses ink and mechanical pressure from the hand. It does not use electricity or electronic parts.Step 5: Identify the odd object.Since Mobile, Computer and Television are electronic devices, and Fountain Pen is a non electronic writing tool, Fountain Pen is the odd one out.

Verification / Alternative check:
You can also verify by asking which of these items must be plugged in, charged or switched on in order to function. The mobile phone, computer and television all require some form of electrical power. A fountain pen, on the other hand, simply needs ink and paper; it is ready to use without any power source. This clear difference in how they work reinforces the classification.

Why Other Options Are Wrong:
Mobile: Electronic device, belongs with Computer and Television.
Computer: Electronic device, consistent with the same group.
Television: Also an electronic device, therefore not the odd one.

Common Pitfalls:
This question is simple, but some learners may look for more refined categories such as communication devices versus non communication devices. While that distinction exists, the examiner has chosen a clearer, more obvious contrast: electronic gadgets versus a non electronic tool. In reasoning tests, always prioritise the simplest strong grouping that applies to most options before searching for more subtle differences.

Final Answer:
The odd word is Fountain Pen, because Mobile, Computer and Television are electronic devices, whereas a Fountain Pen is a non electronic writing instrument.