DSB INTERNATIONAL PUBLIC SCHOOL RISHIKESH (UTTARAKHAND) CLASS -5( Session ) Subject- Computer Ch-1 (Computer at a Glance)
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1 DSB INTERNATIONAL PUBLIC SCHOOL RISHIKESH (UTTARAKHAND) CLASS -5( Session ) Subject- Computer Ch-1 (Computer at a Glance) What is a computer? A computer is an electronic device data processing machine which is capable of processing the huge amount of data very quickly and accurately. The main features of this machine are: Speed: A computer works very fast and can do large number of calculations quickly. Accuracy: A computer always gives correct results. Diligence: A computer can do many tasks at the same time. Memory: A computer can store a large amount of data,which can be used anytime. Versatility : A computer can perform a veriety of tasks and is used in almost all fields. The two main components of the computer system are: Hardware: These are the physical components of computer system which can see or touch are called Hardware. Example:Mouse,Keyboard,Cpu,Hard Disk,Etc. Software: These are the programs or set of instructions which run on the computer system to solve the user s problems like Tux Paint,etc. IPO Cycle Computer works on a simple principle of Input Process Output Input- The data and instructions, which we enter using a keyboard or a mouse into a computer is called input. We can enter numbers, words, pictures or sound as input. Processing After entering data and instructions in a computer, the CPU works on the Input to give a meaningful information. This is called Processing. Output- When the data is processed in a CPU to give useful information, it is known as output. Hardware Devices
2 The physical parts of a computer that we can touch and see are called computer Hardware. ALU(Arithmetic and Logical Unit) - MU(Memory Unit) CU(Control Unit) Input Devices The devices which are used to input the data and the programs in the computer are known as input devices. Keyboard Keyboard is the most common and very popular input device which helps to input data to the computer. It is used to enter text data and instructions in the computer. Mouse Mouse is the most popular pointing device which is mainly used with Graphical User Interface.It works by pointing and clicking the graphical objects on the monitor. Joystick Joystick is also a pointing device, which is used to move the cursor position on a monitor screen. It is a stick having a spherical ball at its both lower and upper ends. The lower spherical ball moves in a socket. The joystick can be moved in all four directions.
3 Track Ball Track ball is an input device that is mostly used in notebook or laptop computer, instead of a mouse. This is a ball which is half inserted and by moving fingers on the ball, the pointer can be moved. Scanner Scanner is an input device, which works more like a photocopy machine. Microphone Microphone is an input device to input sound that is then stored in a digital form. Touch Screen A touchscreenis a computer screen that can be used by touching it with a finger or a stylus pen. This technology is gerenally used in ATMs, mobile phones,tablets,etc. Output Devices Output Device is hardware device used to send data from a computer to another device or user. These peripherals are also used, depending on the type of output to be generated. Monitors or VDU This is the main output unit of the computer system which shows the results in soft copy format on the screen on the screen which cannot be retrained permanently. Printers
4 Printer is an output device, which is used to print information on paper. The printed output produced by a printer is often called a hard copy, which is the physical version of an electronic document. While some printers can only print black and white hard copies, most printers today can produce color prints. Impact Printer: There is a direct contact between the head and the paper through inked ribbon. Example-Dot matrix, Daisy wheel printer, Drum printer,chain printer. Non-Impact Printer: These printers transfer the output directly to the paper without any physical contact between the paper and the print head. Example-Inkjet printer, Laser printer, Thermal printer. Storage Devices Hard Disk This storage device is fixed inside the computer system. It has huge storage capacity ranging from 500 GB to 10 TB. Compact Disc(CD) This is an optical storage device made of plastic and coated with optical material. Its storage capacity can be upto 700 MB. Digital Versatile Disc(DVD) This storage device is just like a CD but its storage capacity is very large which ranges from 4.7 GB to GB. Flash Drive This is an electronic storage device, popularly known as Pen Drive. Blu-ray Disc(BD)- This storage device is like a CD which uses blue laser technology to store the data. Its capacity can range for 25 t0 50 GB. Q1.Tick the correct option: Exercise i. Which among these is an input Device? a. Touchpad b. Printer c. CPU ii. iii. How much is the accuracy of a computer? a.100% b. 55% c. 20% Which part of the CPU controls the flow of data in the computer system? a.alu b.mu c. CU iv. Which storage device is fixed inside the computer system? a.hard Disk b. CD c.dvd v. Which of the following devices gives the soft output?
5 a.monitor b. Printer c.scanner Q2.Write True or False: i. A computer works faster than man. ( ) ii. A printer gives us hard output. ( ) iii. A keyboard is a pointing device. ( ) iv. The capacity of DVDV is more than Blu-ray disc. ( ) v. CD stands for Chargeable Disc. ( ) Q3.Fill in the Blanks.(Pen drive, touchpad, Speed, Scanner, Dot matrix) i. A computer processes the data at a very high. ii. is an inputdevice which senses the touch of a finger. iii. is an example of an impact printer. iv. Flash drive is also known as. v. helps to store image in the computer. Q4.Answer the following question: Q1.What is a computer? Q2.Name two commonly used input and output devices. Q3.What is the difference between Hardware and Software? Q4. What do you mean by soft output? Q5. What do you understand by IPO cycle?
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