Which of the following is a computer?

• A. E-Reader
• B. Laptop
• C. Rice cooker
• D. Blender

Answer: (B)

A computer is a device that can run programs and perform a variety of tasks by processing data according to a set of instructions. A laptop fits this definition because it has a central processing unit, memory, storage, and an operating system that can run many different software programs, enabling it to perform a wide range of tasks.

An e-reader, while it has some computing power, is designed mainly for displaying digital texts and limited apps, so it isn’t treated as a general‑purpose computer. A rice cooker and a blender are kitchen appliances with fixed functionality and simple control logic, not capable of running arbitrary software or handling diverse computing tasks.