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Ans (1): ALU

An arithmetic logic unit (ALU) is a digital circuit used to perform arithmetic and logic operations. It represents the fundamental building block of the central processing unit (CPU) of a computer.

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Ans (3): System unit

A system unit is that part of a computer which has the primary devices that perform operations and produce results for complex calculations. It includes the motherboard, CPU, RAM etc. This unit performs the majority of the functions that a computer is required to do. The difference between the CPU and the System unit is that a CPU is contained in the system unit along with other essential hardware.

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Ans (5): Telnet

Telnet is a user command and an underlying TCP/IP protocol for accessing remote computers. Through Telnet, an administrator or another user can access someone else's computer remotely.

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Ans (1): Scanner

Out of the given options the scanner is an input device. This is because scanner is used to give input to the computer in the form of the image of the document that is being scanned. Rest of the devices show the final result which is called the output, after processing the input.

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Ans (2): Read, write and rewrite information

CD-RW (Compact Disc-Rewritable) is a digital optical disc storage format. A CD-RW disc is a compact disc that can be written, read arbitrarily many times, erased, and written again.

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Ans (1): Application software

Application software uses the capacity of a computer directly for specific tasks and is used to manipulate text, graphics and numbers. It uses the system software as the platform to run its functions and can either be installed on the computer or used online. Some examples of application software are Microsoft Word, Oracle, Tally etc.

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Ans (2): Software

Software is the set of computer programs that is used in a computer to perform various tasks. The computer program or the instructions are included in the software of the system; these instructions collectively give rise to an algorithm that makes the software perform the functions that the software is meant for.

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Ans (3): Trojan horse

In computing, Trojan horse, or Trojan, is any malicious computer program which is used to hack into a computer by misleading users of its true intent.

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Ans (1): Network

Servers are the computers that provide resources to other computers connected to a network. The server computer performs services such as data sharing and sharing of resources among multiple client computers.

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Ans (4): All of these

All these formats can be added to a PPT.

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Ans (2): Super computers

A supercomputer is a computer that performs very high level of computing functions as compared to a normal personal computer. Performance of a supercomputer is measured in floating - point operations per second (FLOPS). The first supercomputer of the world was CDC 6600 made by Control Data Corporation. The first Supercomputer of India is considered to be PARAM 8000 made by Centre for Development and Advance Computing.

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Ans (1): It is an output device

Short for Visual Display Unit, VDU is an older British term used to describe any device used with computers to display images. For example, a flat panel display and a projector are both examples of VDUs. However, VDU is most commonly used to describe the CRT monitor, a now archaic standard that has been replaced by flat panel displays.

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Ans (4): The motherboard

A motherboard (sometimes alternatively known as the mainboard, system board, baseboard, planar board or logic board, or colloquially, a mobo) is the main printed circuit board (PCB) found in general purpose microcomputers and other expandable systems.

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Ans (1): Telephone line, modem, computer, and an ISP

The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. Telephone, modem, computer and ISP are needed to connect to the network.

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Ans (1): Pointing Device

A computer mouse is a pointing device (hand control) that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface.