Hartron Important Questions Part 1

Hartron Important

Q:(A)What is a computer? What are its components ?

Ans:- 

an electronic device which is capable of receiving information (data) in a particular form and of performing a sequence of operations in accordance with a predetermined set of procedural instructions (program) to produce a result in the form of information or signals.(Hartron Exam)

 Five basic components of computer system

• Input Device.

• Output Device.

• Storage Unit.

• Central Processing Unit (CPU)

• Arithmetic and Logic Unit (ALU)

Control Unit

Computer Operations:- The Computer has a different function for each phase of its own working.

 1. Input :- (Data) Data is a collection of raw facts & figures which have been collected from various sources but not in organized form.

2. Process: – Processes the data and converts it into useful information.

3. Information: – When we apply process on data we get some result. This result is called information.

Components of Computer:- In this we can explain the components of computer. The main components of computer are:-

1. Input / Output Unit ( I/O Unit )

2. Central Processing Unit (C.P.U.)

3. Memory Unit (M.U.)

(1) Input / Output Unit: – A device through which we feed the instruction and data into a Computer is called input. 

(i) Input unit are given below:-

a. Keyboard: – The Keyboard is one of the main input devices used in a Computer. It is used to enter text and numeric data in a computer system. Mostly keyboard have 104 and 106 and 108 keys are available.

b. Mouse: – Mouse is the small device. It can move cursor in any direction.There are two types of Mouse:-

• Two button Mouse

• Three button Mouse

c. Scanner: – A scanner ‘scans’ the image from the top to the bottom are line at a time.

d. Light Pen: – A Light Pen is an input device familiar to a mouse. It is use to directly write and draw any figure on the computer screen.

e. Joystick: – A joystick is also used to move the cursor position on screen. Its function is similar to mouse. Children can play games on computers with help of joystick.

f. Touch Screen: – A touch screen is also an input device. When we touch the screen it can detect the presence and location of a touch with in display area. The term generally refers to touch the screen by a finger.

(ii) Output Device :- Output devices are those devices which display and give the result from the computer.

a. Monitor or VDU (Visual Display Unit):- It provides visual displays of data are of different types and have different display capabilities & different size.

b. Printer: – A Printer is the primary output device used to get the printed copy or hard copy of work on paper, slides, clothes etc.

(i) Impact printer

(ii) Non-Impact printer.

(iii) Impact printer: – the printers that print the characters by striking against the ribbon and onto the paper are called impact printers. These printer are two type:-

(1) character printer:- 

(i) dot matrix printer

(ii) Daisy wheel

(2) line printer

(i) Wheel printer

(ii) Drum printer

(iii) Chain printers

(a) Non impact printer: – the printers that print the characters without striking against the ribbon and onto the paper are called non-impact printers. These printers print a complete page at a time. these printer are two type :-(1) laser printer (2) Ink jet printer

b. Plotter: – A plotter is an output device which is used to generate graphical output. It is different form printer in that draws lines using a pen.

c. Speaker: – Speaker is an output device. It is used to listen the music and sounds. It needs a sound card connected to C.P.U.

d. Screen Image Projector: – Projector is also an output device that display image such as a computer screen to be projected on a flat surface. This device is commonly used in Presentations