Type of Computers and their difference.

Q6. What are the three type of computers? How do they differ?

Ans. The three type of computers are:

  1. Digital
  2. Analog
  3. Hybrid
  • Digital computers deal with discrete quantities.
  • Analog computers deal with physical quantities. They measure rather than counting as the digital computers do.
  • Hybrid computers combine the characteristics of analog and digital computers.

Examples and Functions of System and Application Software.

Q5. Give examples for each of system and application software. Explain the function of each type.

Ans. Examples of system software are:

  1. Operating System
  2. Language Processor
  3. Application Software

Examples of Operating System are: Single User, Multi User, Batch Processing, multiprocessing etc.

As the name suggest, Single User OS supports single user whereas Multi User OS supports multiple users. The Batch Processing OS processes the batches (groups) of jobs (processes given to it) and multiprocessing OS is capable of handling multiple CPUs at the same time.

Examples of Language Processors are:

i) Interpreter



An interpreter converts and executes High Level Language (HLL) program into object program line by line where as a compiler converts an High Level Language (HLL) into object program in one go and once the program is error free, it can be executed later. An assembler converts an assembly language program into object programs.

Examples of Application Software are:

i) Customized Software

ii) General Software

The customized software pertains to the requirements of a specific user for whom the software has been developed. General software is developed keeping in mind general specifications of a problem.

Function of Memory and its Measuring Units.

Q3. What is the function of memory? What are its measuring units?

Ans. The memory temporarily holds the data and information during processing.

The smallest unit of memory is a byte (8 bits). A byte can store one character in binary form. Other measuring units are 1 Kilobyte (KB) equal to 1024 (210) bytes, 1 Megabyte (MB) equal to 1024 KB, 1 Gigabyte (GB) equal to 1024 MB and 1 Terabyte (TB) equal to 1024 GB.

Basic Units of the Computer and Names of sub-units that makes CPU and Functions of each unit.

Q2. State the basic units of the computer. Name the sub-units that makes up the CPU, and give the function of each of the units.

Ans. The basic units of the computer are:

  1. Input Unit.
  2. Central Processing Unit(CPU).
  3. Output Unit.
  4. Memory.

The CPU has two sub-units: the Control Unit(CU) and the Arithmetic Logic Unit(ALU).

The Control Unit controls the entire operation being carried out.

The ALU performs the arithmetic and logical operations.