introduction to java and computer

Question 04:

            What is a bit? What is a byte?

Ans:  A switch has two states on/off when switch is on its value is 1 when switch is off its value is 0.These 0 and 1 are interpreted as binary digit called bit or binary numbers.

And a byte is a combination of eight bit. It is a smallest unit to store data.

Question 05:

              What is memory for? What does RAM stand for? Why is memory called RAM?

Memory   Computer memory is like a box in which we can store any type of data.

RAM  it stands for random asses memory.

RAM  Data can be accessed in any order. It is a volatile memory it means all the information can be lost when computer is turned off.

Question 06: 

                 What unit is used to measure memory size?

The computer storage capacity must be measure in byte.

Their are also some methods to measure the memory size.

Kilobyte(KB)  =   1000 bytes

Megabyte(MB)  =   100000 bytes   

Gigabyte(GB)   =    1000000000 bytes

   Terabyte(TB)   =    1000000000000 bytes

Question 07:

              What is the primary difference between memory and a storage device. ?

  Ans: Computer memory has ordered sequence bytes that can be stored programs and data of programs. A program and its data can be moved to computer memory when computer is turned off.

Important note: A memory byte is never empty but its initial contents is meaningless it can be replaced when new contents is placed in it.

Storage Device:A RAM is a volatile type of storing memory the information that can be stored in RAM when computer is turned off.

Different type of Storage devices

01 Magnetic Disk    02  Optical Disk    03   USB flash