All Free Computer Science and IT MCQs with Answers

1121. The Network is overloaded with enormous data sent by many computers within the network. The inability of the network to deliver the data is termed as __________ .

• A. Access control
• B. Congestion
• C. Error propagation
• D. Deadlock

Explanation: Congestion occurs when traffic offered to a network exceeds its capacity, causing delays, packet loss, or inability to deliver data. Deadlock is a resource-waiting condition rather than ordinary network overload.

1122. In IT networking, which of the following device is used in physical layer?

• A. Repeater
• B. Router
• C. Transport Gateway
• D. Bridge

Explanation: A repeater operates at the physical layer by regenerating and retransmitting signals. Routers and bridges work at higher layers, while a transport gateway is not a standard physical-layer device.

1123. A collection of computers connected together is called______?

• A. Processing
• B. Network
• C. Chatting
• D. Centralized System

Explanation: A network is a group of computers and other devices connected so they can communicate and share resources. Processing and chatting describe activities, not the connected system itself.

1124. Servers are computers that provide resources to other computers connected to a___________?

• A. Network
• B. Mainframe
• C. Supercomputer
• D. Client

Explanation: A server provides files, applications or other resources to computers connected to a network. The computers requesting those resources are clients.

1125. What is the last step in data encapsulation ?

• A. User information is changed into data.
• B. Frames are placed into bits
• C. Segments are changed into datagram and packets.
• D. Packets are placed into logical frame.

Explanation: Encapsulation proceeds from data to segments, packets, frames, and finally bits for transmission over the physical medium. Therefore, placing frames into bits is the last listed step.

1126. How much headings in HTML?

• A. 2
• B. 4
• C. 6
• D. None of these

Explanation: HTML provides six heading levels, from h1, the most important, through h6, the least important. These tags structure headings rather than merely changing font size.

1127. which layer of OSI model used by router?

• A. layer 2
• B. layer 4
• C. layer 3
• D. All of above

Explanation: A router makes forwarding decisions using logical IP addresses, which is the main function of OSI Layer 3, the network layer. Layer 2 switching is primarily associated with bridges and switches.

1128. E-mail Stand for____________?

• A. Electronic mail
• B. External mail
• C. Electronic Messaging Advice and Information
• D. Both A and C

Explanation: E-mail is short for electronic mail, meaning messages sent electronically through a communications network. The expanded phrase in option C is not the standard meaning of e-mail.

1129. The communication protocol used by Internet is_____________?

• A. HTTP
• B. WWW
• C. TCP/IP
• D. FTP

Explanation: TCP/IP is the protocol suite that provides the basic addressing, routing, and reliable communication framework of the Internet. HTTP and FTP are application protocols, while WWW is a web service rather than a protocol.

1130. CDMA-technology used in Mobile Phones stands for___________?

• A. Code Division Multiple Acception
• B. Code Division Multiple Access
• C. Code Division Mobile Application
• D. None of These

Explanation: CDMA expands to Code Division Multiple Access, a wireless communication method in which users share a frequency band through distinct coding schemes. “Acception” is not the term used in the acronym.