Informatics Practices Class 11 Chapter 1 : Computer System
Informatics Practices Class 11 Chapter 1A computing device, also referred as computer processes the input data as per given instructions
to generate desired output.
Computer processes data to generate information whose further analysis and interpretation yields
knowledge.
Computer system has four physical components viz. i) CPU ii) Primary memory iii) Input device and
iv) Output device. They are referred to as hardware of computer.
Computer system has two types of primary memories viz. i) RAM the volatile memory and ii)
ROM the non-volatile memory.
Software is a set of instructions written to achieve the desired task and are mainly categorised as
system software, programming tools and application software.
Hardware of a computer cannot function on its own. It needs software to be operational or functional.
Operating system is an interface between the user and the computer and supervises the working of
computer system i.e. it monitors and controls the hardware and software of the computer system.
Informatics Practices Class 11 Chapter 1
Q1. Name the software required to make a computer functional. Write down its two primary services.
Ans. RAM is used to store data temporarily while the computer is working. Whenever the computer is started or a software application is launched, the required program and data are loaded into RAM for processing.
Ans. A computer system primarily comprises a Central Processing Unit (CPU), memory, input/output devices and storage devices.
Informatics Practices Class 11 Chapter 1
CPU : The CPU has two main components — Arithmetic Logic Unit (ALU) and Control Unit (CU). ALU performs all the arithmetic and logical operations. The control unit controls the sequence in which computer programs and instructions are executed.
2. Input Device : The devices through which data/signals are sent to a computer are termed as input devices. for example : keyboard, mouse, scanner etc.
3. Output Devices : The device that receives data from a computer system for display is called output device. It converts digital information into human understandable form. For example, monitor, projector, headphone, speaker, printer, etc.
4. Storage Devices : A computer system needs memory to store the data and instructions for processing. Those devices which stores data for processing are called storage devices like Hard Disk, SSD etc
Q5. Differentiate between proprietary software and freeware software. Name two software for each type.
Ans. Google Chrome, Internet Explorer, Mozilla Firefox etc
Q7. Name the input or output device used to do the following: a) To output audio b) To enter textual data c) To make hard copy of a text file d) To display the data or information e) To enter audio-based command f) To build 3D models g) To assist a visually-impaired individual in entering data
Ans. security threat can increase if the electronic gadgets and the magnetic strip inside the devices are not disposed properly. Personal detail, bank detail, important documents can be fetched through broken hard disk or memory card which can be used by hackers.
Informatics Practices Class 11 Chapter 1
Q11. Write down the type of memory needed to do the following: a) To store data permanently b) To execute the program c) To store the instructions which can not be overwritten.
Ans a) Secondary Storage like Hard Disk, Pen Drive, CD, DVD, SD Card, SSD etc
b) RAM – Random Access Memory
c) ROM – Read Only Memory
Informatics Practices Class 11 Chapter 1
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