We need to apply computer security measuresbecause of the following reasons:
-For normal functioning of computer system.
- For increasing the working speed and expectancyof a computer.
-For proper security of computers.
-For protection of computer hardware and software resources.

The hardware security refers to the protection of computerhardware from factors likedust, over heat, fluctuationof electricity and other intentional harm.

The hardware security measures are:
-Regularmaintenance.
-Insurance.
-Free from dust.
- Fire protection.

The hardware components of computer system are verydelicate devices and they may get damaged if the propercare has not been done regularly. Theregularmaintenanceof computerhelps us to find the problems in hardware.So, theycan be repaired in time before they causeseveraldamage. Hence, application of safetyand regularmaintenancehelps us to keep our computerworking condition.

A password is a secret word that gives gives a user orblocks an unauthorized users to access to particularfile, program or a system. A system password helpsto protect the files and programs from being used byan unauthorized person. So, the unauthorized users cannotmakeany changes in content of a computer. It helps to stopthe spreading of computer viruses, and makes differentsoftwaresecure. So, system password is used in acomputer.

The hardware is sensitive to electric voltage. Itseeds normalelectric voltage for functioning. Thefrequentfailure of electric power can damagecomputer hardware,corruptsfiles, operating system, etc. So, to preventthis problems by providing the computer the constant voltageof power using paper protection devices, we need powerprotection devices fora computer.
Any four power protection devices are:
- Volt guard.
-Constant Voltage transformers.
-Stabilizer.
-Spikeguard.

The importance of UPS are:
-It used as power protection devices.
-It reduces/controls the fluctuation of electricvoltage.
-It saves the hardware/software from being damaged.
-It provides backup electric power.

Data and software security refers to the process ofsecuring data andsoftwarefrom being lost or damaged due to accidental or intentional harm.

The backup system helps to make the duplicate copyof data & software. If data and software get lost ordamaged due to fluctuation of electric voltage, powerfailure , viruses or intentional then backup system helpsus to recover the lost or damaged data or software fromthe backup copy of data and software. Hence, we needto backup data and software.

We can keep the hard disk and floppy disk in good condition by the following ways:
-By using scan disk and antivirus programs.
-By defragmenting the disks.
-By keeping it in dust free environment.
-Using power protection devices that prevents the damageof the disks.

Theprocess of consolidating fragmented files byrearranging the fragmented files in the contiguous spaceson the diskthat helps in normal functioning of a computersystem is called defragmentation.

We need to defrag a hard disk because:
-To analyze the disk and rearrange the fragmented files.
-To reduce/control fragmentation.
-To increase theperformance of diskoperation.
-To increase the contiguous spaces on the disks.

a.When a hard disk of a computer system get damageor lost, we don't lose any data and information.
- False

b.Sometime by mistake user can delete important files.
- True

c.Hardware securing means securing hard disk from being damaged.
- True

d. Dust, fluctuation of electricity and overheat can damagehardware of the computer.
- True

e. The regular check up of computer system helps us tokeep computer system in good working condition.
- True

f. Volt guard and stabilizer can supply back...

a.An electric device that supply steady electric powerwhen electricity is cut off.
- UPS

b. An electric device that supplies electric power whenelectricity is cut off.
- UPS

c. A secret word that gives a user access to a particularfile, program or system.
- Password

d. A program that disinfects virus.
- Scan disk

e. Acopy of file orprogramthat is used whenoriginalfile is corrupted.
- Backup copy

f. A programthat checks and keepshard disk in goodcondition.
- Scan disk

g. A program...