Question Discussion & Solution

The correct answer is option 3 i.e ​Ctrl + Z.

• Ctrl + Z is the shortcut key to undo an action in MS Word.
• Ctrl+W is the shortcut key to close the current window.
• Ctrl+B is the shortcut key to Bold highlighted text.
• Ctrl + U is the shortcut key to underline a text.

The correct answer is Modem.

Key Points

• Modem, (from “modulator/demodulator”), any of a class of electronic devices that convert digital data signals into modulated analog signals suitable for transmission over analog telecommunications circuits.
• A modem also receives modulated signals and demodulates them, recovering the digital signal for use by the data equipment.
• Modems thus make it possible for established telecommunications media to support a wide variety of data communication, such as e-mail between personal computers, facsimile transmission between fax machines, or the downloading of audio-video files from a World Wide Web server to a home computer. 
• Most modems are “voiceband”; i.e., they enable digital terminal equipment to communicate over telephone channels, which are designed around the narrow bandwidth requirements of the human voice.
• Cable modems, on the other hand, support the transmission of data over hybrid fiber-coaxial channels, which were originally designed to provide high-bandwidth television service.
• Both voiceband and cable modems are marketed as freestanding, book-sized modules that plug into a telephone or cable outlet and a port on a personal computer.

Additional Information

• Packet:
  • A packet-switched network routes digital data in small pieces called packets, each of which proceeds independently through the network.
  • In a process called store-and-forward, each packet is temporarily stored at each intermediate node, then forwarded when the next link becomes available.
  • In a connection-oriented transmission scheme, each packet takes the same route through the network, and thus all packets usually arrive at the destination in the order in which they were sent.
  • Conversely, each packet may take a different path through the network in a connectionless or datagram scheme.
  • Since datagrams may not arrive at the destination in the order in which they were sent, they are numbered so that they can be properly reassembled.
  • The latter is the method that is used for transmitting data through the Internet. 
• Keyboard:
  • Keyboards contain mechanical or electromechanical switches that change the flow of current through the keyboard when depressed.
  • A microprocessor embedded in the keyboard interprets these changes and sends a signal to the computer.
• In addition to letter and number keys, most keyboards also include “function” and “control” keys that modify input or send special commands to the computer.​​

The correct answer is Versatility, Diligence.

Key Points

• Versatility is the characteristic of a computer to perform completely different types of work at the same time, whereas diligence makes it to work for hours without boredom or tiredness. 
• Versatility means the capacity of the computer of performing more than one task at the same time.
• Diligence is the capacity of the computer of performing repetitive tasks without getting tired.
• A computer is free from tiredness, lack of concentration, fatigue, etc therefore it can work for hours without creating any errors.

Additional Information

Characteristics of Computer System are:

• Speed - A computer works with much higher speed and accuracy compared to humans while performing mathematical calculations. 
• Accuracy - Computers perform calculations with 100% accuracy. 
• Diligence - A computer can perform millions of tasks or calculations with the same consistency and accuracy. 
• Versatility
• Reliability
• Memory

The correct answer is Supercomputer.

Key Points

• A supercomputer is a computer with a high level of performance as compared to a general-purpose computer.
• The performance of a supercomputer is commonly measured in floating-point operations per second (FLOPS) instead of million instructions per second (MIPS).

Additional Information

• World's fastest supercomputer - Fugaku (Japan)
• World's first supercomputer - CDC 6600
• India's fastest supercomputer - PARAM-Siddhi AI

The correct answer is 8.

• 1 byte is equal to 8 bits.
• A byte is a unit of information in computer storage and processing and contains 8 bits.

Additional Information