Important Computer MCQs
1. Which of the following is the smallest unit of memory ?
A) Bit B) Byte C) Kilobyte D) Megabyte
Ans: A) Bit
Explanation: A bit is the smallest unit of data in a computer. It represents either 0 or 1.
2. Which device is used to connect multiple computers in a network ?
A) Switch B) CPU C) Monitor D) Printer
Ans: A) Switch
Explanation: A switch connects multiple devices within a computer network and enables communication between them.
3. Which of the following is volatile memory ?
A) ROM B) Hard Disk C) RAM D) CD-ROM
Ans: C) RAM
Explanation: RAM is volatile memory because its stored data is lost when the power is turned off.
4. Which protocol is used for sending emails ?
A) HTTP B) SMTP C) FTP D) POP3
Ans: B) SMTP
Explanation: SMTP (Simple Mail Transfer Protocol) is used for sending emails.
5. Which of the following is an example of an input device ?
A) Monitor B) Keyboard C) Speaker D) Projector
Ans: B) Keyboard
Explanation: A keyboard is an input device used to enter data and commands into a computer.
6. What is the full form of URL ?
A) Uniform Resource Locator B) Universal Reference Link C) Unified Resource Link D) Uniform Reference Locator
Ans: A) Uniform Resource Locator
Explanation: URL stands for Uniform Resource Locator and represents the address of a resource on the internet.
7. Which of the following is NOT an operating system ?
A) Windows B) Linux C) Oracle D) macOS
Ans: C) Oracle
Explanation: Windows, Linux and macOS are operating systems, whereas Oracle is primarily a database/software company.
8. Which type of computer is used for weather forecasting and scientific research ?
A) Mainframe B) Supercomputer C) Microcomputer D) Minicomputer
Ans: B) Supercomputer
Explanation: Supercomputers are used for complex calculations such as weather forecasting, scientific research and simulations.
9. Which of the following is used to uniquely identify a device on the internet ?
A) IP Address B) MAC Address C) URL D) Domain Name
Ans: A) IP Address
Explanation: An IP address identifies a device/interface on an IP network and allows communication over the internet.