Class 10 Computer Science Note


Computer security

Computer security refers to the protection of computer system and its valuable information against unwanted access, damage, modification or destruction.


Some computer hardware security measures

i) Regular maintenance

ii) Insurance

iii) Dust free

iv) Air condition system etc.

And some computer software security measures are as follows:

i) Password protection

ii) Backup system

iii) Defragmentation

iv) Scan disc


Hardware security

The protection of all hardware components used in computer system is known as hardware security. The computer equipment, software and data need to be protected from physical harm like fire, lightening, water, etc. as well as damage or theft, which is possible by hardware security which helps in protection of computer system.


Software security

Software security secure the data and software from getting lost and damaged and helps to insure privacy. It also protects data and software from the computer viruses. So, software security helps to prevent data loss.



Backup is a copy of a file which is used in the event of the original file being corrupted.


password & good criteria for a strong password

A password is a secret word or phrase that gives a user access to a particular program or system. Any four good criteria for a strong password are as follows:

i. Do not keep a password which can be easily guessed such as date of birth, nickname, etc.
ii. Do not keep a password that is similar to your name or surname.
iii. Do not keep word as a password that is currently popular.
iv. Keep changing your password regularly.



Scandisk is a process, which involves in maintaining the disk files and folders using a kind of utility software.


Computer virus

Computer virus is a computer program that is designed to copy itself and infects or damages a computer without permission or knowledge of a user.


voltage regulator

A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level.



Defragmentation is the process of locating the noncontiguous fragments of data, rearranging the fragments and restoring the, into fewer fragments or into the whole file.



The scattering of the parts of the same disk file over different locations is called fragmentation.

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