COMPUTER SCIENCE AND ENGINEERING
SYSTEM SOFTWARE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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check for the presence of peripherals like mouse, sound card, scanner
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defragments the hard disk
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be loaded first when the computer is powered on
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none of the above
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Detailed explanation-1: -Hence when a computer is switched on, the BIOS is loaded from ROM. Random-access memory is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code. It is a computer’s short-term memory.
Detailed explanation-2: -The BIOS starts the monitor and keyboard, and does some basic checks to make sure the computer is working properly. For example, it will look for the RAM. The BIOS then starts the boot sequence. It will look for the operating system.
Detailed explanation-3: -At initial power on, the BIOS is executed directly from ROM. The ROM chip is mapped to a fixed location in the processor’s memory space (this is typically a feature of the chipset).
Detailed explanation-4: -The first thing a computer has to do when it is turned on is to start up a special program called an operating system. The operating system’s job is to help other computer programs work by handling the messy details of controlling the computer’s hardware.
Detailed explanation-5: -The first job of the BIOS after you switch your computer on is to perform the Power On Self Test. During the POST, the BIOS checks the computer’s hardware in order to ensure that it is able to complete the startup process. If the POST is completed successfully, the system usually emits a beep.