9th Computer Science | Chapter # 2 | Short Questions | Answers | Notes | All boards of Punjab

1.  What is meant by computer programme/ software?

Ans.  A set of instructions given to a computer to do a specific task is known as computer program.

2.  What are computer ports?

Ans. It is a socket that enables an external device such as a printer to be attached to the computer. All communication between a computer and external device is the result of concerned ports.

3.  What is the use of Data bus?

Ans.  It carries data. It is an electrical path that connects CPU, memory, Input/output devices and secondary storage devices.

4.  What are the Registers?

Ans. It is a storage location to store information that is currently being processed. It is a temporary storage area for instruction and data.

5.  Define electronic data processing (EDP).

Ans. The process of performing arithmetic and logic operations with the help of computer is known as electronic data processing (EDP).

6.  Differentiate between serial pat and parallel part.

Serial Port	Parallel Port
It transmits one bit of information at a time.	It transmits 8 or 25 bits of data at a time.
It is slower.	It is faster.
It is referred to as communication   (COM) ports.	It is referred to as line printer ports (LPT)
Mouse and keyboard use serial ports.	Printers and Scanners use parallel ports.

 7.  Define computer Hardware

Ans. The physical parts of the computer which we can see and touch are called hardware.

8.  How many types of software?

Ans. There are two types of software

(a)           System software:-  It refers to the program that are responsible for controlling and managing the computer hardware. For example operating systems like Windows, Linux etc.

(b)       Application software:-  It is used to accomplish tasks specified by the user. For Example MS Word, MS Excel, MS PowerPoint, Inpage, Corel Draw etc.

9    Define main memory.

Ans. It is the working area of the computer. It consists of millions of cells each capable of storing a bit.

10.            How many types of ports?

Ans. There are three basic types of ports.

(a) Parallel port       (b)       Serial port    (c)       USB port

11.            Write the names of system buses.

Ans. .(a)  Data bus       (b) Address bus       (c)       Control bus.

12.            What is soft copy?

Ans. An electronic version of a document stored on a storage device is called soft copy.

13.            What is system unit?

Ans. It contains motherboard, RAM, hard disks, floppy disk, microprocessor etc. which are enclosed in a rectangular casing (tower or desktop).

14.            Explain USB ports.

Ans. USB stands for universal serial bus. It is a plug and play hardware interface for peripherals such as keyboard, mouse, scanner, printer modem etc. It has a maximum band width of 12 Mbits/sec and up to 127 devices can be attached.

15.            What is input unit?

Ans. Input unit consists of input devices such as keyboard, mouse, scanner, digital camera, microphone. This unit is responsible for entering data into the computer.

16.            Differentiate between Arithmetic unit and logical unit?

Ans. Arithmetic Unit:-  It can perform the mathematical operations such as addition subtraction, multiplication and division.

Logical Unit:-  It can perform logical operations such as comparison of numbers, letters or special characters.

17.            Define Control Unit.

Ans. It consists of circuitry that generates signal to the computer to execute the programs. It also controls the flow of information through the processor.

18.            Define system bus.

Ans. An electric pathway on the mother board to connects different components of system unit with each other.

19.            What do LSI and VLSI stand for?

Ans. LSI stands for large scale integrated circuits VLSI stands for very large scale integrated circuits.

20.            Write name two types of system software.

Ans. WindowsXP, Linux, MS DOS

21.            What is meant by Computer Hardware?

Ans. The physical parts of the computer which we can see and touch are called hardware. OR the tangible parts of the computer are called hardware. For example I/O devices, syatem unit etc.

22.            Define Secondary Memory.

Ans. The storage devices that are not temporary in nature and that do not have the same restrictions of size are called secondary storage device. Secondary storage is required to permanently store information that is not needed in memory all of the time.

23.            Describe the use of Parallel Ports

Ans. Parallel Ports

(a) It transmits 8 or 25 bits of data at a time.

(b) It is much faster than serial port.

(c) It is the largest port on the back of your computer.

(d) It is often referred to as line printer port (LPT)

(e) Printers and scanners used parallel ports.

24.            Define System Software.

Ans. System software refers to the programs that are responsible for controlling and managing the actual operations of the computer hardware. It consists of an operating system ( windows, linux, DOS), disk for matters, file managers etc

25.            What does ALU stand for?

Ans. ALU stands for Arithmetic Logic Unit

26.            What do you know about Mouse?

Ans. It is an input device that rolls around on a flat surface and controls the pointer on a display screen. It is used to select text, access menus and interact with programs, files or data that appears on screen.

26.            Define data bus.

Ans. Data bus carries data. It is an electrical path that connects the CPU, memory I/O devices and secondary storage devices. It contains parallel group of lines.

27.            Define input. Also write input devices.

Ans. The data given in the computer to do a specific task is called input. Input of a computer system consists of input devices e.g. Mouse, Keyboard, Scanner, Digital Camera, Microphone etc.

28.            Differentiate between data bus and address bus.

Ans.

Data Bus	Address Bus
·        A data bus carries data.	·        An address bus carries address information.
·        It is an electrical path that connect the CPU, memory I/O devices and secondary storage devices.	·        It is a set of wires that any connects CPU and memory.

29.            What is CPU?

Ans. CPU stands for central processing unit and is also known as brain of computer. Its primary work is to convert data from input, process the data and get output in a useful information. It also performs arithmetic and logic operations. It also executes program instructions.

30.            Define output.

Ans. The results obtained after processing are called output. Data after processing becomes information and this information is taken as output.

31 What is register?

      Ans.  A register is a small high-speed memory inside CPU. The CPU contains a number of registers. Registers are used to store information being processed. These are temporary stored in registers.

32.            Describe the use of ports.        

Ans.  A port is a socket that enables an external device such as printer to be attached to the computer. All  communication between a computer and external devices is the result of properly connected ports.

33.            What is meant by EDP?                                      

Ans.  EDP stands for Electronic Data Processing. The processing of Arithmetic and logic

          operations with the help of computer is called EDP.

34.            What is motherboard?                                       

Ans.    The most important component of system unit is a rigid rectangular circuit board called mother board. All other            components are etched onto it. It is made up of silicon. An electronic pathway on it connects different components with eachother.

35.            How is control bus different from address bus?   

Ans.        

Control Bus	Address Bus
i.   It carries control information from      the control unit to the other units.	ii.  It carries address information.
ii.  It controls the functioning of I/O devices, secondary storage devices.	It connects CPU and memory.